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For what it's worth I've got a Communications Concepts Inc. (CCI) digital display for my FRG-7. It sits on top. No longer available of course but if you can find one I can highly recommend it. It's

Thanks Pentagrid…I thought it might be one of those myself, but the pin out doesn’t match. As previously mentioned, it looks like a TI logo on on of the images, and SN something or other for the

Hi All, When I looked carefully (pic time_step-01.jpg in files/DFC-7), the mixer is definitely Texas Instruments, and I thought I could make out "SN7651?". Did a search and came up? with a data sheet

By memory I think you will find the mixer is a CA3028 transistor array or similar. Look in any 1970s? American? radio constructor books for details of these chips, they were used often before the

Enjoy it stock. Not worth the effort.

Thanks everyone for your help on this...I've put Steve's diagram and instructions through PaintShop Pro and uploaded the results into the 'files' section on the group. Pentagrid - I've spent most of

Hi All, It seems that loading an image to messages reduces it's resolution :-( So I've put various images etc into files/DFC-7; resolution is 1600x1200 vs 1024x768. Something to remember for the

Simon I have fiddled with the background colour - do these help? Andy

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

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

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