[TenTec] IMD Measurements - Yaesu/Inrad vs Orion

Eric SENSI eric.sensi at skynet.be
Fri Dec 24 16:57:57 EST 2004


Yes, you're right... the sidetone is not the transmitted signal !

I tried this with a friend of mine this morning, he didn't notice anything
strange in the CW enveloppe. Now, he was listening to me with an SGC 2020
with ADSP2 and a Yaesu FT-7B ! :-) Of course these rigs are not in the same
class as the MArk V, so I can't tell exactly.

Anyway, I'm running the Mark V for 4 days now without ANY problems, I was
afraid at first, but it seems that this radio is rock solid here. Compared
to the list of problems I had with the 2 Orion's I owned, just the key
clicks problem is not really an issue ! I know this could be annoying for
the others, so I'll do the mod as soon as I possibly can.

Best regards, Eric.

-----Message d'origine-----
>>I can hear no clicks at all into my sidetone when using my G4ZPY straight
>>key !
>>
>>
>
>Listen on another RX, not sidetone.
>
>
Yes. In many (perhaps most) rigs the side tone has very little relation
to the actual transmitted CW signal. It is only an audio oscillator (or
tone generation routine in a microprocessor) that gets keyed nearly
simultaneously with the real TX output. In many cases it will follow
high speed keying input very accurately even when the real RF output
dits and dahs are chopped short.
DE N6KB



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