I removed the relays in my Paragon and Paragon II and installed TIP-41C
transistors to key the amplifiers' positive relay lines. Transistors don't
Phil Chambley, Sr.
From: Tim and Nancy Logan <firstname.lastname@example.org>
To: email@example.com <firstname.lastname@example.org>
Date: Sunday, February 17, 2002 7:58 AM
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