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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.

[QUOTE="Unit 75, post: 681498, member: 42248"] 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. [/QUOTE]

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