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Yes, thats exactly how it was done, the input signal was mixed with a 3.455 MHz oscillator, a low pass filter used to remove the higher mixing product, the counter chip then? read the difference.

Hi Simon, Unfortunately I don't have the originals; the attachments are as I found (somewhere; too long ago to remember) the on the web. Re the schematic,? it is readable, albeit with some

Hi Mark I would never spoil the radio. This kit sits in a box on top of the radio. cheers simon

Thanks Steve, that’s exactly what I need. Sadly the circuit diagram is a bit low res to read clearly. Would you mind scanning the DFC-7 pages for me, or if you don’t have a scanner, could you take

Don’t fit the digital display gents, it looks terrible and completely ruins the whole feel visually of the radio. The whole beauty of this radio is its retro appeal and I urge you to not be tempted

Hi Simon, Have attached a data sheet on the MSM5525 plus a couple of pics re the DFC-7. Enjoy

Hello I've just joined this group and have a mint FRG-7...it came with its box and other bits. A friend gave me an old digital display unit which turns out to be a Timestep Electronics DFC-7 from

Yes It’s an easy mod I had more trouble getting the radio out of the exterior case M 73

That's roughly what I did. I'd have to take back apart to look. Was *very* minor.

I found the fine tune capacitance on my particular radio ?operated nicely with a series cap of 6.8pf….as the mod…. 73Mark Sent from the all-new AOL app for iOS

Miguel, Most welcome. Be careful about who you buy a nanoVNA from as there are lots of bad copies. The H4 has the advantage you can load time-frequency FW to it, though not both at the same time. It

Thanks Reg, I will get a NanoVNA as it seems very useful. Just one doubt: where can I see the limits of the signal we can inject in TP103? Don't we need an attenuator in the nano-VNA to protect the

Here is my H4 hooked up with CH0 connected to TP103 and TP102 and CH1 connected to TP104 and TP105 per the manual. SMA-M/BNC-F adapters and BNC-M to alligator clips. One can do rather better with a

Miguel, At the time I used my HP 8560A spectrum analyzer which has a tracking generator as the nanoVNA didn't exist yet. The setup is very simple. There are test points at which you inject the signal

Well if the red LED is extinguishing that means at TP110 you have enough signal. But it is a tad complex this radio. May I direct you to articles in Short wave magazine written by JL Linsley Hood.

Reginald, I would be interested in learning how to do the alignment using a nanoVNA, if you are kind enough to share the process. I thought nanoVNA was only for antenna / filter testing; so you use it

Thanks Mike for the hints which were very helpful. I followed your procedure without success: the lock light would never go off (sometimes it would just dim a bit). After touching VR102 as per

Put Deoxit on the switch contacts and align it using a nanoVNA per the factory manual. . It's an easy radio to work on and a really neat design.It deserves its reputation. Have Fun! Reg

If the radio has been in storage long, take a can of canned air and blow all the dust off all of the tuner caps. That might help you hear something. I have an FRG-7 that was in storage for maybe 10

When you have access to a 3D printer,? you can print your own feet, rear lugs and switch covers. Have have 3D designed the switch covers (see :