Reader’s Questions

Sony CRF-5100 Earth-Orbiter Problems

Hello – I read your article at, on the Sony Earth-Orbiter 5100. I just purchased one from Craigslist which had been advertised as being in mint condition. Cosmetically the unit looks all right, but when I turned it on, it had the following issues: I can only receive the local AM station at 1260 because I am only a mile from the transmitter. The RF gain control is not the problem because it was all the way “up”. The AM audio is not distorted – it just will not pick up anything beyond the local station. FM was very intermittent, changing from good reception to none at all, without being bumped physically. Shortwave bands seemed okay. The weather band behaved just like the FM, picking up intermittently. The big bandswitch on the side does not seem to be the problem – it does not crackle when switching bands.

I saw your picture of the vertical switches when the radio was disassembled, and your remark that a good cleaning solved the problem for you on your radio, but your problem was on FM. I can probably disassemble the radio to a limited degree, but soldering a circuit board is beyond my ability.

I purchased a service manual for the Sony 5100 online as an acrobat file, but it is very technical, and beyond my abilities. I am hoping for a bit of advice on a simple repair, like taking it somewhere to be cleaned.

Thanks for your excellent online article, and I hope to hear from you on (perhaps) what to try before signing up for expensive repairs.


A: Ron,

I’m sorry you’re having this problem…nothing is more disheartening then getting a new (or old) radio only to find it has a problem. The intermittent FM/Weather band issue is almost always caused by the two vertical slide switches I pointed out in the review…cleaning them usually resolves this problem.

Unfortunately, the very weak AM reception problem will probably require expert service and may or may not be easy. With respect to the RF Gain control it should be full CCW in “Normal”.

First rule out the main bandswitches. I would check this again…take a minute with it set to AM, working the knob around the detented AM position to see if there are any blips or bursts of sound. If you are sure the switch is 100% solid and reliable (it could still be bad but will usually show intermittent noise when exercised), I would check that the ferrite rod is not broken – this sometimes happens in shipping and will render the AM just as you describe. Remove the back cover following the disassembly instructions in the service manual and check the rod. If it is broken it can usually be repaired to work 100% as well as new if carefully glued together. Check for a perfect fit between the two halves and use superglue. The perfect fit is necessary for the antenna to work properly without being retuned so get it right and the set should then work properly on AM.

There are a myriad of other possibilities which would require a technician to locate such as a failed component in the AM circuit, a bad solder joint, broken lead wire (possibly from the ferrite rod), a bad adjustment pot or coil etc.

So check the bandswitch and ferrite rod and if you rule those out you will need help getting it fixed…please let me know how you make out with this.



Comparing Apples To Oranges To Peaches

Grundig SAT 750 VS Tecsun PL-660 VS C.Crane CC Radio SW/Redsun RP-2100

Q: I Read your reviews on these models. If price was no factor, which would you take?

John A

A: Hmmm…Interesting question with many aspects to consider. First, I think you would also have to discount their size to make such a choice. Otherwise it’s like asking, if a stretch limo and a small car were the same price, which would you want? In some cases you’d need the limo, but in other cases the smaller car would be much more useful. This raises a point I like to stress often – just as there is no perfect radio, there is also no one best radio. For a radio lover like me, I like many radios for different things, with each having strengths and weaknesses. Which radio is best for you or for a given application is a different question – only be understanding how models compare and differ can you make a choice that will please you. That’s why I laugh at those who have so much ego invested in arguing to the death why their favorite radio is “the best”…that’s a losing game.

To get back to your question, if these radios were the same price and size, here’s how I would decide. If I wanted best AM reception I’d choose the SAT 750 as the PL-660′s AM is its weakest point. For SW the SAT is a hair more sensitive but the PL-660 has synchronous detection which sometimes makes it more desirable. The SAT has Air band, the PL-660 does not. The SAT sounds better due to its size. But since they’re not the same size you have to consider that the PL-660 is much smaller for travel while the SAT 750 is a nice size for an around-the-house or stationary radio.

Here’s another choice that has no one right answer: SAT 750 versus CC Radio-SW/Redsun RP-2100. The Sat has keypad direct entry, AIR and built in SSB, but the CC/Redsun  has better audio, better AM and FM, and is half the size and price. Which you prefer has much to do with what you want in a radio.


Aligning Radios

Q: Jay,  I love your site. I’m an old guy who did not get the math gene, so I never had a chance to pursue my major love of electronics as a kid. I have some time now to play around with electronics and look forward to getting into this hobby in a serious way.

I am very interested in what you had to say about aligning the 500H. Could you provide precise instructions or even better,  a youtube video of exactly how you did this for us new guys?  I have some young kids who are showing an interest in all of this. Hope I can get them as excited as I was at their age about radio stuff.

Did I say I love your site?


A: Ron, Although I could give you the general flow of the alignment procedure, it is spelled out explicitly in the Service Manual and it varies a bit from model to model. It presupposes that you have at least a basic understanding of the circuits being adjusted (otherwise you won’t know if the alignment is going properly or not…there are pitfalls that can lead to poor results), that you use an RF Signal generator and ideally some sort of meter to read the output. An oscilloscope is not usually necessary for simple AM radio alignments although it would work in place of a simple meter.

The service manual also provides diagrams which give you the physical adjustment locations…without that you don’t know which adjustments are which even if you know the procedure. The Royal 500H has 8 adjustment points, and although a seasoned pro might be able to figure out which are which, even he might get stuck on one unusual IF blocking adjustment in the 500H…so you really need the manual. It will also give you the frequency limits which vary from model to model. Again, someone who has aligned hundreds of radios can usually do an AM only portable totally by ear, especially if he is very familiar with what stations are available in that particular area to use as test targets, and get results very close to what he would get with test gear, but if you’ve never aligned a radio before, following the exact procedure with the test gear is much easier than doing it without. And of course, for anything more complex, such as multiband radios, trying to adjust the radio without service info is a bad idea.

If you decide to get the manual and proceed I’ll be happy to help you in any way that I can, but you must start with the service manual. You will also need an RF signal generator and some sort of frequency reference…my signal generator is not very accurate so I use a PLL-tuned radio as a frequency reference along with a frequency counter…alternatively you need a very accurate sig gen so you will be able to generate exactly the right frequencies needed.


Panasonic RF-2200 With Intermittent Switches 

Q: Hi Jay.

I’ve got an RF2200 that when selecting SW1 or SW6, I have to manually hold the SW switch selector down hard to get either of those bands to come in. If I let go of the switch, the bands are weak and can barely be heard. Switch positions for SW2 thru 5 work just fine.

Would popping off the switch and spraying a little De-Oxit be advisable to try to resolve this problem…or is this a fix that needs to be performed from inside the radio?



A: Todd,

This problem is very common in this radio but it is also easy to fix. But it must be done from inside…spraying the control shafts from the front will not get the cleaner into the band switches at all …you will just make a mess.

But don’t despair…removing the back for access to the switches is easy, and you will see why spraying from the front would have done nothing once you see how the switches are constructed.

Lay the radio on its face on a soft surface such as a folded towel, remove the battery compartment cover and 6 screws (one in the battery compartment). Carefully lift the rear panel away noting that there are three  wires which have to be removed…they can only be plugged back in one way so don’t worry about putting them back incorrectly.

Now you can see that the band switches are large, horizontally-running items. I recommend De-Ox-It from Caig Labs as the best switch cleaner/enhancer. Be sure to use Q Tips or paper towels and alcohol to wipe away any spillage…use the least amount of spray possible while working the switches many times…many times back and forth. You should find normal operation restored.

The toggle switches on the front are also usually problematical. Removing the front panel to get at them is also easy. Pull off all the knobs and press downward on the plastic latch in the hole uncovered by the tuning knob and the front panel will pull off. Spray into the switches while working them many times and clean up any spillage.

This should restore your radio to normal operation.


Sangean ATS-909X Questions – Is It Hot Or Not?

Q: Jay,

I’ve been reading many conflicting reports on this radio. Some say it is very sensitive, others say it is not. Isn’t this likely to be unit-to-unit variations? I also heard there have been upgrades…maybe new units are better than the initial production runs? What do you think? I really want your opinions on this becasue I’ve been reading your columns for years and you are one of the most knowledgeable and balanced reviewers I’ve found. Your expereinces always seem to mirror my own. And I love your new web site!



A: Smitty,

First, thanks very much for your nice email…I really appreciate it!

The differences of opinion on the ATS-909X (like the ATS-909 before it) are due almost entirely to the way the radio is tested and used rather than unit-to-unit differences…these radios are of high build quality and generally vary very little sample to sample. In a nutshell the radio is not very sensitive to very weak signals on AM or SW on its built-in antennas but you have to compare them with other radios under identical circumstances to see this. If you just use the radio and have no basis for comparison it will seem fine. But put it side by side with any of several competing radios and the Sangean will be very weak on many signals which come in much better on the more sensitive radio. This is true on AM and SW and it has been compared and verified on many samples. This seems to affect very weak signals on the Sangean more than medium strength signals which it seems to receive quite well compared with the other radios I comapred it with.

The Sangean has many plusses too. If you are using it with an external antenna, including the supplied wire antenna, it works very well. With a serious external antenna it also does well for a portable so in this mode it is a good choice. Many happy users of the original model and now the new one report it excellent as a desktop replacement and realize this is its best mode of operation. My only complaints are on stand-alone performance as a portable on AM and SW. It does very well on FM off the whip by the way…it’s FM whip performance is superb.

So when people say they have a 909 or 909X and it works well I don’t disagree…it’s all in how you are using it. No radio is best at everything. But if you compare it side by side with a more sensitive radio (such as a Degen DE-1103) you will see a huge difference in AM/SW reception…it’s very obvious.

Many people get their egos into a “my radio is best” mode and “if you don’t like my radio you must be wrong” attitude. I’ve seen some ridiculusly heated exchanges becasue of this in some of the radio discussion groups. How silly. I have a large radio collection and none is best at everything, even though I love most of them. If you read my reviews you’ll see that I try to present each radio’s strengths and weaknesses to help readers decide what best fits their needs.


Degen DE-1103 vs DE-1106 vs Tecsun PL-660 

Q: Hello,

I intend to buy a portable radio and I am trying to decide between the Degen 1106 and the Degen 1103.

I had the chance to operate a friend’s DEGEN 1103 and it was as you describe. i didn’t like the handling because it has few buttons with a 2 or 3 simultaneous operations via each button. The volume control is a big issue….and after of a few hours of operation/handling Ididn’t get 100% used to it. I also didn’t like the 64 volume steps which don’t alwaya allow fine control at low levels.

I’m curious about the Degen DE-1106 which has a big usable display, a better signal meter,
direct buttons for volume control…(although with only 31 steps) and direct buttons for the most operations. How would you compare the DE-1103 and DE-1106? Is there a big difference in reception/sensitivity/selectivity/audio quality? In your report you have both radios with two ** but I need a more detailed comparison to choose which radio to buy.


A: Apostolis,

Unfortunately no one radio is best at everything but I will compare a few of these competing radios to help you decide because your listening habits will be what makes your final choice once you know their nuances more clearly. I will add the Tecsun PL-660 to the mix because it excels in some areas too.

The DE-1103 will give reception as good as it gets in this size/price class on MW (AM) where it decisively beats all the others. If AM performance is really important to you this is the one to get – period. The only others which match this AM performance are the now discontinued Eton E5/Grundig G5 which delete the faux analog display add buttons for volume control…you may still be able to find one of those.

The Tecsun PL-660 has several advantages, one of them being a real volume control knob which is a real pleasure in use. It also has sync which locks much better than any Grundig G3 or Degen DE-1106 I have seen so it is much more often helpful, as the sync on the G3 and DE-1106 drops out so often as to become annoying in some circumstances. The PL-660 also offers superb SW and FM performance, handles an external SW antenna better than the radios below, and so far seems to have excellent quality control and unit-to-unit consistency…its weakness is AM which is noisier than the radios above. I am a real fan of AM radio so this really bothers me but I like the radio for everything else. It is a joy to use…I don’t really like Up/Down stepping volume controls compared with a real knob with infinite adjustments.

The Degen DE-1106 and Grundig G3 are overall quite similar in performance…they are both made by Degen and I suspect they are more alike internally than externally. Both models have been plagued by inconsistency unit-to-unit and sub-par AM  performance compared with the DE-1103/E5/G5…their AM is closer to the PL-660. I have had several samples of each and they varied in overall tonal balance (some are warm and full while others are thin and hissy), sync performance and the degree of digital noises affecting the AM band. If you get a good one they are fine little radios except for slightly sub-par AM and weaknesses locking into sync mode, but you have to be willing and able to swap out a defective unit which rules out mail-order unless you have no other option.

SO…if the very best AM is very important to you I recommend the DE-1103 in spite of the ergonomic issues you mentioned, or a G5/E5 if you can find one. If SW is more important to you I recommend the PL-660 for its great ergonomics and excellent SW and quality control. If you really love the DE-1106 display…and it is a very attractive radio, just be sure you can get a good unit with good audio and few digital noises on the AM band, along with sync that locks when properly tuned to the signal and which holds down to a weak signal level. Otherwise stick with the PL-660…it seems to be a safer bet.

I hope that helps you…as I say…there is no perfect radio. Only by knowing their individual strengths and weaknesses can you make the best choice for you.


Is There One Best Radio Or Antenna?

Q: Jay,

I have been researching things pretty hard on the Internet, in many ways simply increasing my confusion.  However you appear to know what you are talking about and have helped many.  I hope that you can advise me and clear up my points of confusion.

My needs:  Optimal AM, FM, and SW sensitivity.

FM:  I live in the mountains and listen to an FM station (maybe 50-60 miles away) during the day (music and some talk) which is very hard to tune on my 30 year old Sony as it is wedged between two other signals.  When I am not getting interference from the station immediately above or below the desired one, the radio actually jumps to one or the other station altogether.  It is sheer luck when I can land on the spot where it stays on the desired station and without interference from another.

AM:  I work at night and listen to AM talk all night, usually on clear channel stations hundreds of miles away.  Additionally, I would love to have the capability to do some decent DXing.  Also I would love to be able to pick up “local” AM stations (~50 miles away) during the daytime which I presently cannot (at least not without unbearable background noise).  I would also love to have minimal static and/or hum from the wires in the walls and the computer in the room.

SW:  I have not had a functioning SW radio in years but would like to resume listening to it, both for DXing and regular daily programming.

Additional:  I have never had SSB so I am not sure whether I should regard it as necessary.  Air band would be fun to have just for playing around.

After quite a bit of research online, I am inclined toward either the Eton/Grundig Satellit 750 or the C. Crane CCRadio-SW.  Which would you prefer?  Or is there a better one I am missing?  What radio out there best meets my needs?

An interesting thing I saw you discuss with somebody online is antenna setup.  Did I understand you to say that even if one buys a C. Crane with built-in Twin Coil Ferrite, one still actually needs to buy the external TCF for optimal reception?  You also mentioned loops.  Is a TCF always better than a loop?  Will a loop add anything to a TCF?  What is the optimal antenna setup for the radio which best meets my needs?

One thing that caught my eye about the Satellit 750 is that, although reviews are very mixed, somebody said that it has the best reception without an external antenna of any comparable radio.  But even if true, how good is that reception?  How much improvement might an external TCF provide?  What about an external TCF on a CCRadio-SW?  Is there still a marked improvement?  Does the internal TCF disconnect when the external TCF is plugged in or does it even matter?

I would appreciate any recommendations you might provide.



A: Ken,

Without realizing it, your question is so all-encompassing that it virtually requires me to tell you everything I know about AM/FM/SW radios and antennas in one email, which if course, is not possible. I will try to explain areas you have to be aware of to try to guide you into making some decisions but I cannot give you a single answer to answer all of this. I’m sure you understand.

First, you are asking, “What radio is best for AM and FM and SW? There is no simple answer to that as there is no perfect radio…no radio is best at everything. Every radio of the hundreds I’ve seen has strengths and weaknesses so I can only tell you which radios are generally considered best in certain areas of performance. Next you are asking about external antennas. That will depend on which radio you get and what your areas is like. Then local interference…that is different in each case, as are the ways to deal with it. I can’t recommend a radio which will ignore your local noise…you have to tackle it as best you can and as it matters to you. Huge topics all!

OK. So what CAN I tell you. Well, if you must limit your purchase to one radio to cover all three bands (AM/FM/SW), here are some top radios in no particular order with their strengths and weaknesses.

Eton E1/E1/XM (discontinued but some still available through Universal Radio or on eBay):

Best with external antennas…very good reception on all bands and decent sound. AM  Problematical on whip antenna except in the RF quietest areas. Expensive.

Grundig SATELLIT 750: Designed for excellent SW sensitivity off the whip and can handle an external fairly well. Mediocre AM unless you use an external. FM good.

CC Radio-2: Excellent AM/FM reception with built-in antennas…about as good as it gets except in strong signal areas, but no SW. Does have 2 meter HAM and Weather bands. Audio not a strong point on this one…good value for AM/FM.

CC Radio-EP: Similar AM reception to CC Radio-2, slightly weaker FM but still good. But you get much better sound. No digital features or SW. A real AM/FM bargain at $69.95.

CC Radio-SW: Decent SW from the whip but not quite as sensitive as the SAT 750. However its AM is much more sensitive. (See what I mean about no one radio being best at everything?) FM also very good and excellent sound…a good all-around workhorse.

Degen DE-1103 or Tecsun PL-660: In a smaller carry-around portable two of the best on SW and FM. AM better on DE-1103.

There are a few options in used radios on eBay but dealing with used radios is way beyond the scope of this email.

Antennas: I don’t know if you need an external antenna until we know how a known radio performs in your area. Most of the above radios will be much more selective on FM than your old radio so you should not have the problem of trying to separate your favorite FM signals. The CC-2 in particular has a very sensitive selective FM but the others are all very good too.

AM: Again, a very sensitive AM radio like the CC-2 or CC-EP will “hear” every signal that is available in your location, limited only by your local noise (RFI) on their own. Radios which are less sensitive on AM like the SATELLIT 750 or CC-SW will benefit more from a loop antenna or the separate Twin Coil antenna. The passive AM  loops such as the Terk, Tecsun, Degen, Select-A-Tenna et al, follow the laws of physics and tend to perform similarly. I have reviewed most of them for you to read about. A larger loop such as the MTM will provide more signal as will the C.Crane Twin Coil. Again, if you chose a less sensitive AM radio in order to get better SW performance, the benefit of the loop will be greater, so get the radio first and see how it does. You can also tackle RFI once you see how good your reception is.

Well…there’s a start for you…I hope I’ve helped you. Feel free to contact me again with specific questions.


Longwire/Random Wire General Questions: 

Q:  Jay.

I have ample distance to string a 200’ long-wire antenna outside but it could be strung only 4’ above ground alongside a non-metallic yard fence. Actually, I could string one up to 500’ feet if that would be better.  Can this be bare wire or do I need something coated or shielded?

We do have a lot of RF noise sources at our residence such as a 100KW solar power inverter for house electrical power (lots of EMI), many dimmer switches (lots of RFI) and many motors for pond, pool and fountains that run 24/7.  None of this equipment interferes with our modern radios or TVs, which is not the case with our AM tube radios.

Maybe I should forget about SW and buy a couple C. Crane Antennas.


A: Bill,

An outdoor antenna would be great for you assuming there is lower noise outside your house where the antenna would be. It could work very well for SW as well as AM. You can check for this using a portable radio. Ideally you would tune it to some weaker station which is covered with noise in your house and take a walk out where your antenna might be. Try several frequencies. If the reception is better there…less or no noise and a good signal that is a good spot for your antenna. Such an antenna is often referred to as a longwire antenna but is properly called a random wire…random wires are the simplest wire antennas because they do not have to be cut or tuned to specific frequencies…any reasonable length from perhaps 50 up to hundreds of feet will work well…in practice 50 to 200 feet is a common range. 300 – 500 feet could be incredible but you would probably need a top quality receiver to handle all that signal without overload, and possibly also an external RF attenuator or pre-selector. But we’re getting ahead of ourselves. First some basics.

One of the good things about random wires is that the details are usually not very critical. 4 feet is not an ideal height…20 – 30 feet would be better, but even at 4 feet a long random wire should be awesome. Any type of wire will do…wires are usually chosen for durability more than electrical differences.

Use plain wire for the antenna itself, but to prevent noise from being picked up on the lead-in wire which comes into your house it is essential to bring that signal in using shielded co-axial cable. If you use a plain lead-in wire much of the low noise properties of your antenna will be lost. You will have to obtain a proper balun matching transformer to convert the high impedance wire to the low impedance coaxial lead-in and you should also install a ground rod at the point where the coax enters your house to bleed off static and protect your equipment. You can research the web to find out some details of this…one good site for this is:

The Twin Coil antenna on the other hand will usually give you the best AM reception you are likely to get inside your house short of an external antenna, and you could also get an extension cord with it to locate the receiving element in the lowest noise spot in or around your home. However,  antennas are always trial-and-error. It’s a great antenna and it can sometimes do wonders in reducing nose and amplifying signals better than most indoor AM antennas but whether it will bring you the reception you desire can only be determined by trying it. I own several.

Let me know how you make out!


Tecsun PL-660 vs Sangean ATS-909X

Q: Jay, I love your new website! You are without a doubt one of the most believable radio experts I’ve found and I love your approach to reviewing radios and explaining exactly why you like what you like and don’t like. I’ve taken your advise several times and found you were always right on.

My question is about the Tecsun PL-660 versus the Sangean ATS-909X on Shortwave. In your review you pretty much explain that the PL-660 is as good as it gets on SW in this class of portables. Does that mean it outperforms the ATS-909X which costs more than $100 more?



A: Barry,

Yes absolutely. The PL-660 is FAR more sensitive off its whip antenna than the Sangean is. The Sangean looks impressive and is well made but if actual reception as a portable is important to you there is simply no comparison. The Tecsun will receive many signals you will not be able to receive on the Sangean. True, the Sanean works very well with an external antenna but so does the Tecsun, handling external antennas far better than most other portables in this size class. Plus the Tecsun has excellent synchronous detection which holds lock as it should and can sometimes make an enormous difference on a particular signal, both in terms of improving selectivity against an interfering neighboring signal and in terms of reducing the audible results of selective fading.

Thanks for you email!


May, 2011

Grundig G3/Degen DE-1106/Tecsun PL660 Sync Lock Questions 

Q: Hi Jay,

I have read your excellent article in Monitoring Times and would appreciate some additional info interpreting the article. I just received a new G3 and need to know if it is performing satisfactorily, particularly in the area of sync detection. My understanding is it should only be used on shortwave and medium wave. I am a longtime  amateur radio operator so assume it would not be helpful with ham radio signals—-or would it?

When I use sync detection and press the sync button I see “sync- usb ” on the screen and I  can accept that if it sounds ok. Or I can see what lsb sounds like.

But what freaks me out is when I get the “howling”  instead of the satisfying sound of the sync locking on.

I like the radio but I get the howling maybe 25-30% of the time. Is this par for the course on what I can expect of a proper functioning G3?


A: Hal,
You are correct…sync is used only on SW and MW (AM) bands and is not used when listening to HAMS in Single Sideband (SSB) mode. People often confuse these because sync has Upper and Lower Sideband modes too (and sometimes DSB or Dual Sideband Mode) but those are not the same as Upper and Lower SSB modes.

Your G3 may be less then as good as it should be. The howling means it has lost sync and is trying to re-lock into sync mode. One problem with many of the current crop of radios is that precise tuning is critical for the sync to lock…in other words, you have to be tuned exactly to the signal, say 9410, whereas better sync-equipped radios would allow you to tune between perhaps 9707 and 9413 and still be in sync. The G3,  Degen DE-1106 and Tecsun PL-660 all have a very narrow range of sync lock width. Unfortunately, some of these radios are not perfectly aligned, so to lock in sync they have to be off-tuned by 1 KHz, so yours might hold sync lock better if it were tuned to 9409 or 9411. This is, of course, annoying although it can be lived with if it doesn’t drive you crazy. Also, this specific tuning point is likely to vary over time as radios tend to drift a bit with age, temperature, battery voltage etc. So sync lock width is one issue to check. As this is likely to change as I said you might choose to live with a unit that it 1 KHz off but the best samples are right on…I have now checked 6 units and 4 of them were right on.

A more important issue is sync lock depth…how weak the signal can be and still hold sync lock. The earliest G3’s only locked onto relatively strong signals, rendering the sync almost useless because as the signals faded the radio would drop out of sync, then howl, especially when it tried to relock. The best samples hold sync lock down until the signal is almost gone and that’s how it should be.

Of course, even with perfectly working sync there are times it does not help or may worsen a signal…that’s why it is always defeatable, so you have a choice of which mode sounds best with the particular signal you’re listening to.

I hope that helps you.


Zenith Transoceanic D7000Y Dead On AM & SW  - Troubleshooting Tips

Q:  I  plan to look at a Zenith Transoceanic D7000Y, with chassis 500MDR70 this weekend. The owner claims it doesn’t work on AM and SW bands but ok on FM. I see from your website that you have some experience with this model. Do you have any idea of what could  cause this particular problem ?



A:  Don, First you should rule out the usual problem areas in these sets…dirty bandswitch contacts and poor contact at the plug-in transistor sockets – always check both of these first. After that it could be anywhere in the areas common to AM and SW;  the local AM oscillator, Mixer, and  IF stages and the detector.  Let me know what you find.


Sony 7600GR Vs Modern Sync-Equipped DSP Portables

Q: Hello Mr. Jay! I enjoy your new website!!!   I would like you to answer some questions in regards to the new DSP  radios-If you please!  Are there any radios on the market (mail order or physical radio stores) which can compete against the Sony ICF 7600 GR?    The Tecsun PL 390 (and other radios of the same ilk) seem to be resemble cheap Mattel toys of the 1960′s!  Can they make a good SW radio with DSP, synchro detection, tuning knob and good build quality that can compete against the Sony icf 7600GR or even the classic Sony icf 2010 of the 1980′s?  Can Sony (the most popular and trusted of the radio manufacturers) make a “new” Sony icf 7600 with DSP, keep the synchro, add VHF air band, tuning knob, a bigger LCD display and make it like a miniature Sony 2010?  Please add some advice…RSVP!  THANKS!!!!!!!!!!!!!

A:  Whew! There are hours of discussion points in all those questions. There is no clear-cut answer to the first portion because the Sony 7600GR is mechanically made very well and has excellent quality control, whereas most of the current world band portables in a similar price range have lesser quality control, even though some outperform the Sony. You mentioned several models but for the purposes of this discussion let’s stick to models with similar features and in a similar size/price category.

There are three sync-equipped models currently available that compete directly with the 7600GR. They are the Tecsun PL-660, the Grundig G3 and the Degen DE-1106. None has the sample-to-sample consistency of the Sony and that is a sad commentary on the state of things. However, the PL-660 seems to be somewhat better in this regard, even in its initial production run than the other two. But any of the three, assuming a properly functioning sample, outperform the Sony on raw SW reception. Weak signals are stronger on them. If you are listening to a weak signal that is fading in and out, placing the radios side-by-side, you will find that the signal holds on longer on the other three radios than it does on the Sony, and when the signals are audible on all the radios, the Sony is a bit noisier. Now keep in mind we are talking about a side by side comparison which tends to make small differences very noticeable. If you don’t tend to seek out weak signals you may be perfectly happy with the Sony, but if you want to hear the most signals with the least noise, the other three are a bit better. All three also have tuning knobs and all have a bit clearer audio than the Sony…also much better FM reception and AM that is similar or better as well.  I would also point out that the now almost-classic DegenDE-1103 is an excellent performing radio on all bands at a bargain price even though it does not have sync.

But YOU have to decide what’s most important to you. BTW…NONE of these radios is anywhere near the quality or performance of the Sony 2010…that’s still a reference portable here. Even the Eton E1, now discontinued, had many superiorities over the Sony 2010 but it also had areas of inferiority…no radio is best at everything. My recommendation is to enjoy each model for what it does well and if you can own more than one, pick the one that does the particular job best at the moment. Searching for one “best” radio will lead you nowhere because that radio doesn’t exist.

As for Sony upgrading the 7600 with all those new features that is highly unlikely. Sony has steadily abandoned the shortwave radio market and with the passing of the 7600GR it looks like that will be it.


Grundig Satellit 750

Q: I would like to know why you haven’t reviewed the Grundig Satellit 750?  I would appreciate your comments about this receiver especially with regard to its performance on the AM broadcast band.  Thanks.


A: Don,

I decided not to review it because I was not happy with it overall. Here are some facts to explain why I feel this way:

First, the SAT750 is very sensitive on SW off the whip…about as good as it gets in this area. This is its main strength.

Unfortunately there are many negative points:

Strange IF characteristics cause extremely non-linear tuning. As you tune across a signal, with each increment the signal rises, then falls, then rises, then falls…it’s very unusual and quirky. It is also asymmetrical in most samples…sound and signal strength are usually stronger on one side of the correct center tuned frequency. These issues have been verified on multiple samples.

AM performance, in spite of the rotating ferrite rod, is weak. Most of my decent AM radios are far better.

Sound is mediocre for the size…again…the Redsun RP-2100/CCrane CC Radio-SW and CCrane CC Radio EP, or any of the Superadios sound FAR richer and fuller in much smaller packages.

I may yet post an article on it as people keep asking me about it.


Grundig G3  

Q: I do not know all of the technical measuring tools for sensitivity, but every review I have read on the G3 is that is not nearly as sensitive as the (Sony) 7600 gr and that the G3 does not hold its sync well.   Can you comment on this?



A:  Daniel,

There is a lot of variation in the G3’s…I bought three before I got a good one. So there are many reports that are based on people’s experience with a less-than-good sample. It shouldn’t be this way obviously, and we can infer that the G3 is a risk. That said, I can report on how a properly operating G3 works.

It will beat a 7600GR easily on SW…it is much more sensitive. It is also much better on FM…more sensitive and much more selective. They aren’t even in the same category. They are closer on AM…the G3 is as good or better over most of the band but is perhaps just a tad weaker than the Sony above 1200 KHz.

The sync on a good G3 holds very well and can be a big help as it is on the Sony. It does tend to drop out prematurely on bad samples though. On a good G3 the sync will lock when the station is precisely tuned in – it should not require being off-tuned at all, and will hold lock almost until the signal fades to nothing. So the thing with the G3 is to be sure you get a good one and if it doesn’t perform as it should, get a replacement.

Or get the Sony. No QC issues…they all work pretty much the same (which is as it should be), but it’s been somewhat eclipsed by newer models. And it sounds rather midrangy too. I don’t use mine much anymore.

I might recommend a Degen DE-1103 to you. Decent quality control and superb reception on all bands. It doesn’t get any better in this size but you have to put up with the quirky volume control arrangement.

I hope that helps you…it’s never black and white.


Sangean ATS-909x

Q: I received my ATS-909X this week and am very satisfied with it. I’m not sure I understand the reports of poor sensitivity for this portable radio that some are reporting. I’ve only had two or three other shortwave portables before this one, and the 909X clearly outperforms them. Maybe my expectations are different. Last  night listening on 41 and 31 meters I stopped counting stations after I hit 40. This morning I was able to pick up quite a few stations between 21 and 13  meters. I have not yet connected an external antenna. This is not what I would call being “deaf” off the whip.

A: This seeming contradiction can be easily explained. The term “Deaf” as used in relation to other radios which are more sensitive…it would be more accurate to say hard of hearing rather than deaf which implies it would hear nothing.

With any properly working, decent radio, as you tune around you will find many strong listenable signals. Even the cheapest $30 analogs will do this. But if  you compare quality radios, side by side, under identical circumstances you will begin to see difference, and that is what people are describing.

For example, take a relatively “whip sensitive” portable like the Degen DE-1103 (about $100). Set it next to an ATS-909X and start to compare AM or SW reception  on as many signals as you can. Under those direct comparisons you will see that many stations which are weak on the 909 will be stronger on the DE-1103. The  DE-1103 will be able to receive some faint signals you simply will not find on the 9009X. So it’s more accurate to say the 909X is not very sensitive (on SW or AM) with  its built-in antennas, but you need some basis of comparison to see that. This does not mean the 909 is a bad radio as it has many strengths which have  been well documented here. It’s never balck and white…there is no best radio. The 909 is very good with external antennas, it’s god a good Fm section even on  the whip, it sounds nice and has great aesthetics.

I hope that clarifies it a bit for you.

Jay Allen

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