This relay controls nothing but keying an external amp. The best thing to
is to cripple the relay so it makes no noise at all. I removed the cover to
relay and jammed a small piece of cardboard between the armature and coil
so the relay could no longer move. This completely stops the relay clicking
noise and has no side effects. Later, if you ever want to reenable the
all you have to do is remove the cardboard.
Carl Moreschi N4PY
----- Original Message -----
From: "Tim and Nancy Logan" <email@example.com>
Sent: Sunday, February 17, 2002 12:34 PM
Subject: [TenTec] OMNI V.9 Delay Adjust pot R32
> Hi folks - thanks for the many responses regarding "clicking" of relays.
> Your responses eventually led me to section 3-5.18 of the manual which
> "when operating cw, a dropout delay is incorporated in the relay
> circuit. The delay time is factory set to an average value and may be
> adjusted via a small trimmer pot on the Control Board.... There is no
> delay in other modes. Setting this control for a longer delay will help
> reduce the noise caused by the relay during cw keying."
> Then under section 6-10 of the manual it says:
> "The buffered transmit request signal from the microprocessor at
> connector 66 also drives control relay RLY 1 via D20 and Q18 to provide
> a ground at the center pin of the rear panel RLY OUT connector during
> transmit. In CW mode, Q12 connects C8 into the circuit to hold Q18 and
> RLY 1 on between dits. This hold-in tome as adjusted by the board
> mounted DELAY ADJUST pot R32".
> I won't pretend to say that I understand this, but it does seem to say
> that for some reason the factory does not set this pot to make the
> maximum reduction in relay noise during cw keying. Rather, it sets an
> average. Many of you mentioned use of external amplifiers which I do not
> have and will not have in the future. Possibly this "average" setting
> has something to do with external amps?
> I would like to experiment and adjust the pot for quieter relay sound
> but am not sure what else, if anything, this adjustment might impact. Do
> any of you understand this well enough to explain what this "delay" is
> for and how adjustment of the pot affects any operating characteristics
> of the rig?
> Thanks again for the help folks.
> 73/KB7OEX Tim Logan
> TenTec mailing list