Yaesu FRG-7

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spudgun

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I have had this FRG-7 for many years now. Ever since I got it I have been confused about the A band (.5 - 1.6)

It seems that it is a band that must use the BC ant connector on the back. However when I hook up a long wire or my dipole reception on this band in nil. I have added a new crystal filter in the 3trd IF section and a 19db pre-amp in the front end.

Reception is great on all bands except band A.

Is this a normal operation??

Larry
 

N8IAA

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I have had this FRG-7 for many years now. Ever since I got it I have been confused about the A band (.5 - 1.6)
That is the AM broadcast band. 500khz to 1600khz. I presume that there is a resistor between the two red wire connectors. Have you hooked it up with the center on the red and the ground on the black? Remember the radio from years ago. But, it is a communications receiver, not a ham radio.


It seems that it is a band that must use the BC ant connector on the back. However when I hook up a long wire or my dipole reception on this band in nil. I have added a new crystal filter in the 3trd IF section and a 19db pre-amp in the front end.

Reception is great on all bands except band A.

Is this a normal operation??

Larry

HTH,
Larry
 

elk2370bruce

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The FROG rated right up there with the old SW-8 and the dynamite Hammarlund boat anchors. Keep that beautiful sweet rig on the air and in good shape. They are worthy of your pride and care.
 

spudgun

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Thanks N8IAA for the response.

Yes I reliaze it is the AM band but I cannot receive any stations on it.

I do have a 100Ohm resistor between the SW and BC.

I was messing around with it and found that if I use a .2 mfd cap in place of the resistor I get a better coupling and can get a signal, not much but it is there..

Funny all these years and I just now figured it out.

It is a communications receiver and I bought it used back in the 80's. In fact, it is priviate labeled for Sears & Robuck, but it is a FROG

Thanks for the info....

Larry
 
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kb0nly

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Cool you got one of the old rebranded Frog's.... Nice rig!

Does it have the 2m and 6m transverters in it also or not?
 

spudgun

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No just straight .5 - 30Mhz.

I know there are better receivers out there but it's like owning a 57 chevy. It may not have a turbo on the engine but it gets down the road and It does have some cool factors.

Now if i can find a Collins R-390 working for good money I would buy it.....

My old Navy Radioman days coming back to me...

Larry
 

nanZor

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It is a communications receiver and I bought it used back in the 80's.

Oh man, my old FRG-7 was my pride and joy - even went so far as to send it to a place called Radios-West (I think...) and had a 2.4 khz crystal filter switched into it for a bit more selectivity. We're talking 1979. Whew!

Anyway, being used, there is the possibility that the former owner may have purposely defeated that band with a mod / trace cut, etc if they were suffering from BC overload. Just a thought. You might also have a flaky bandswitch or some other hardware getting grungy.

Keep an eye out for the electrolytic caps - see if the tops are bulging / leaking etc and replace if necessary. With 3 decades under it's belt, the electrolytics might be getting a bit dry...
 

mitaux8030

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What's going on with Frog-7s these days? I bought mine about a decade ago for ten bucks. Now I see them going for 200 or even 300!
 

nanZor

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Nostalgia mainly - and they are bulletproof if someone hasn't taken a "golden screwdriver" to them. Not much to go wrong.

The FRG's were a reasonably affordable alternative for casual amateur / swl' ing. In my case I lusted after a Yaesu FR-101, but couldn't swing the cash, so the FRG filled the bill.

It also has the very interesting Wadley-Loop tuning system, which back in the day made them very stable - and this stability at that affordable price made the FRG a star in it's day.
 

Token

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The FROG rated right up there with the old SW-8 and the dynamite Hammarlund boat anchors.

Gonna have to respectfully disagree there. The FRG-7 does not, and did not, rate with the upper end Hammarlund or Hallicrafters rigs. And the SW-8 came along over a decade later, and was in a different class from the FRG-7. Don’t get me wrong, I love my FRG-7, and still use it occasionally. I also still have its younger siblings in the line, the FRG-7000, FRG-7700, and FRG-8800 (the FRG-7700 is in daily use, right next to all the new gear). I never bothered with the FRG-9600 as I saw it as a departure from the line.

At its price point the FRG-7 was a very good performer, one of, if not the, best you could buy for that amount of money at that time. It was about twice the cost of the Realistic DX-150/160 or DX-200 (or the Lafayette BCR-101) and more than twice as good, the DX-300 was in the same cost bracket as the FRG but except for the digital readout on the DX-300 the FRG was the better of the two. The Drake SSR-1 was also one of its competitors, and they were very similar in price and performance although again I thought the FRG-7 was the better of the two. The FRG-7 came out after the Allied/Realistic SX-190 left production, but they performed very much on par with each other with possibly a slight nod to the Frog, although the SX-190 has not aged as well as the FRG-7 has. When I first got my FRG-7 the SX-190 was the solid state rig I used most, although most of my primary rigs were tube at that time. But the FRG-7 simply did not compete with the likes of the Hammarlund HQ-180, SP-600, HQ-200, or HQ-215, radios long out of production by the time the FRG-7 came around as Hammarlund itself was gone by then. It probably did exceed the performance of the low end or early Hammarlunds, along the lines of the HQ-100 or HQ-110.

The mid to late 70’s (FRG-7 heyday) was kind of a dry time for SWLs as far as serious entry level equipment went. Most of what could be had new was simply cheap. There was lots of cheap gear out there, and there was some very good, and expensive, gear out there, but the mid-point gear, like the FRG-7, the SSR-1, and the DX-300 was few and far between. In the late 60’s the mid-point buyer had many selections to choose from, and again by the mid 80’s the mid-point was well represented. Yes, the FRG-7 is probably iconic for its period…even if not the best that could be had.

Today the mid-point has again ebbed. What is mid-point today? What will be the FRG-7 of 2010? Probably the Icom R-75 is it.

T!
 

spudgun

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Hertzian,

I also replaced the narrowband crystal and modify the DX/LOCAL switch to bring it in and out.

I have had it for soo long it just sits there on y shelf waiting for me to turn it on.

It does what I want it to do.
 

majoco

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If you rewired the DX/Local switch for some reason, it may be that you stuffed up the wiring to the BC band A which goes through the lower section of the switch in the schematic. It doesn't matter whether you have another antenna into the BC socket - the SW1 socket goes through C4 to the BC socket. I can't quite get my head around the reason for the Local-off-DX switch - it seems to me that in the "off" position it goes straight through - so it's really saying that the attenuator is "Off" - surely that's the max gain position - surely that should be labelled "DX"!

Anyway - temporarily connect your longwire to point "A" on the RF board and see if you get any BC band signals now - if so, start fault finding the "attenuator" - or bridge it out altogether! If you do get BC band front end overload, better to wire in a fixed value attenuator than that confusing switch!
 

spudgun

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OOPS my error. I did not switch the new mech filter when I installed it. It was hard wired in direct replacement.

I also installed a 19db preamp in series with the ant and S1 (local, off, DX) switch. This allowed me to bring it in on the DX mode and off and back to origional ckt. This was done by using just a one side of the S1 switch. The other side which switches the BC ant in and out was left alone.

I really am not that concered about the BC .5-1.6 band. I can still get some of my favorite am channel on band B.

I do think that maybe I will need to clean out the switch contacts and they have tarnished over the years. WHen I have it apart I will look for pregant caps...

Larry
 

nanZor

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Ah, bringing back memories - I'd have to agree that if you own an FRG-7, use it and enjoy it for what it is. I forgot about that DX/Local/Off switch!

What I remember most is that at the time, I had some experience with higher-quality radios, but couldn't really afford them. But what the FRG7 got me excited was the stability, and being able to get on frequency with some sort of accuracy! My previous inexpensive radios relied on "bandspread" techniques and 100 khz crystal references. Being about 10 or 20 khz near frequency was a good deal until I got my hands on the FRG!

I wasn't all too thrilled about the S-meter either! Looked like they pulled it out of a cheap fm-stereo tuner.

Thing was, the FRG-7, like the SSR-1, belonged in the same Wadley-Loop tuning family as the Racal RA-117 - something that at the time was "unobtainium" to me. Although of course the FRG and SSR couldn't hold a candle to that!

Hang on to it, fire it up every now and then for a few hours or days to try and keep the electrolytics happy, and enjoy!

By the way, decades later I DID get hold of my dream radio - the Yaesu FR-101 all crystalled up with 2 and 6m converters as well. I was so excited to get hold of a mint unit - problem was, technology marched on in the past 3 decades, and while it worked well, it wasn't up to par with today's specs. Having to tweak the preselector all the time isn't my cup of tea these days either. :) Thing is, I still listen to it now and then admiring it for what it was - but it isn't my main rx that's for sure.
 
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spudgun

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central, Wi.
After reading all these FRG-7 threads and some suggestions I looked at the schematic this morining and realized that when I installed the 19db rf amp, the BC and band A ckt was NOT being amplified by the RF amp.

All other bands were going through the RF amp. DUH!

I guess that is why I get such great receiption on the other bands but not the "A" band.

Wont take long to fix that....

Thanks for getting my old brain working again. It just goes to show that if you think about something long enough it can be figured out....

Larry
 
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