UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - 10M FM

Jon_G4MDC · 19th Nov 2018, 8:30 pm

haha, no, as written the TX output is divided by 12 so the original FM10D's phase mod at 2.5MHz can do the FM for me. That also means minimal mods to what is an almost mint condx set inside.

There is another similar chip, the Si570, which has ability for direct FM if you order the right variant. Those are expensive to buy.
I have one in something else "just for research purposes". They seem to just manage 5kHz dev at 2m and so 2.5kHz at 4m.

They might be OK at the 10m FM dev specs but struggling I suspect.

Hope you like the display - inspired by Yaesu FT207 !!

19th Nov 2018, 8:30 pm	#19
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: 10M FM - any activity these days? haha, no, as written the TX output is divided by 12 so the original FM10D's phase mod at 2.5MHz can do the FM for me. That also means minimal mods to what is an almost mint condx set inside. There is another similar chip, the Si570, which has ability for direct FM if you order the right variant. Those are expensive to buy. I have one in something else "just for research purposes". They seem to just manage 5kHz dev at 2m and so 2.5kHz at 4m. They might be OK at the 10m FM dev specs but struggling I suspect. Hope you like the display - inspired by Yaesu FT207 !!