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1.5 KHZ SSB OFFEST?

Sonar

Sr. Member
Apr 8, 2016
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Although i had this Madison retrofitted with a quasi vfo, and true frequency counter.about 4 years ago I've always been curious as to Mike's description about the 1.5 khz offset. What is a - 1.5 khz offset? My Madison's frequency counter shows a 1.5 khz offset to the + side on upper SSB, and -1.5 on lower SSB.
Mike seems impressed with the fact that the frequency counter shows this offset.
I've never seen another frequency counter show this offset. Can someone explain this 1.5 kilohertz offset to me?
 
Last edited:

Hey, Sonar... I have 4 or 5 of those Madison's with the 858 chip that use Ralphs VFO/counter kit. The newer models have the encoder mounted in the display instead of being incorporated in that side mounted case on your radio.
sp5it is correct about the 7.8 MHz crystal filter in your unit.
Your radio has a carrier offset of +/- 1.5 KHz above and below your 7.8 MHz for USB and LSB. Ralphs VFO/counter is set up for that so it actually reads your SSB frequencies instead of just the AM frequency.
 
Hey, Sonar... I have 4 or 5 of those Madison's with the 858 chip that use Ralphs VFO/counter kit. The newer models have the encoder mounted in the display instead of being incorporated in that side mounted case on your radio.
sp5it is correct about the 7.8 MHz crystal filter in your unit.
Your radio has a carrier offset of +/- 1.5 KHz above and below your 7.8 MHz for USB and LSB. Ralphs VFO/counter is set up for that so it actually reads your SSB frequencies instead of just the AM frequency.
Thanks for expanding of the first reply. Your detailed description has answered my question, and solved the mystery of the 1.5 offset my Madison's frequency counter shows. 73
 

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