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Correct. I think we are both right. The 858 SSB chassis uses a mechanical relay to switch RX & TX.

Technically, Electronic switching involves grounding out the TX line where Relay switching involves connecting the RX & TX wires together - ground isn't necessarily involved. It works in this case because in both radios pin 1 & 4 are connected internally.

I just feel sorry for the person that picks up an old 138XLR stock mic and tries to use it on a modern 4 pin Cobra radio...or their Stryker SR955HPC.

[QUOTE="Dr_DX, post: 808657, member: 1260"] Correct. I think we are both right. The 858 SSB chassis uses a mechanical relay to switch RX & TX. Technically, Electronic switching involves grounding out the TX line where Relay switching involves connecting the RX & TX wires together - ground isn't necessarily involved. It works in this case because in both radios pin 1 & 4 are connected internally. I just feel sorry for the person that picks up an old 138XLR stock mic and tries to use it on a modern 4 pin Cobra radio...or their Stryker SR955HPC. [/QUOTE]

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