So for $79 I ordered Doug's newest DDS VFO. But they are going for over $100 and some of them need a lot of TLC. I was looking at picking up a used HG-10 or similar tube VFO. I own two vintage radios, a HW-16 and a Johnson Viking Adventurer. Without this change the 128 step would have been 1.28 and 12.8.Ĭhanged the horrible RCA output jack to an SMA jack. With my 128 step encoder this gives 2.56 Khz per turn and 25.6 Khz per turn which I preferred. ![]() Reprogrammed parameter 9 from 0.002 to 0.001. ![]() Parameter 8 was 0.010, changed to 0.000 to eliminate contact bounce (needed for stock encoder but not for optical encoder. Reprogrammed microprocessor using TeraTerm software. Used optical encoder (128 step) purchased used on eBayĤ. Replaced 80Mhz Xtal oscillator with a TXCO from eBay for high freq stability. I made several changes to the stock board:ġ. Output is about 0.25V PP so requires a buffer amp of some sort to adequately drive a tube mixer. ![]() I purchased the "vintage" version and use as the VFO in a neo-vintage 20M SSB transceiver (tubes).
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