[WT-support] SSB voice keyer question?
olecam at f5mzn.org
Wed Sep 22 07:49:58 CEST 2004
> Je viens de tester sur un tx et sa charge 50ohms!! le voice Keyer de
> win-test excité par une carte son. En monitoring ça à l'air QRO!
> J'ai également poussé le vis à laisser branché ma pastille HC5 sur
> l'entrée micro du PC et à exciter via un transfo d'isolement 600 ohms le
> tx par la sortie HP de ma carte son > Ça semble également QRO en
Do you mean that you always have the mic connected to the rig through
the sound card? Maybe not a good idea, as if you must reboot your
computer for any reason, you will not be able to transmit untill reboot
To minimize the RF feedback problems and have the best sound quality,
the best way is to have a "phone" transformer IN and OUT of the sound
card and some relays to commut between soundcard and real microphone.
Use a plastic box, or isolated connectors (ground must not be common
between soundcard and microphone).
Anyway I've no experience in SO2R using the soudcard as a voicekeyer. I
usually have an external MFJ one, connected to the "main" radio. So
that, the SO2R box only switch mic on "radio 1" or "radio 2". First
times that I operated SO2R, I did even not have a switch for the
microphone, the heil soundset was connected to radio 1 and an hand-mic
was connected to radio 2. This solution is not very practical and there
is a disadvantage: one can sometimes transmit accidentally on the two
radios at once without realizing it, however it is a rules violation!
Olivier / f5mzn
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