|Subject:||Re: [TenTec] QSK with QSK-5PC|
|From:||"Steve N4LQ" <firstname.lastname@example.org>|
|Date:||Tue, 9 Nov 2004 19:38:33 -0500|
Phil et al.|
Just to clear up any confusion. I got home from work and checked the schematic on this mod. The T voltage is being uses, derived from connector 61 on the control board. This is driving Q16 which has been changed to a 2N5554. The emitter remains grounded and the collector runs directly to J7, the relay output. This is what keys my amp.
----- Original Message ----- From: <email@example.com>
Sent: Tuesday, November 09, 2004 1:01 PM
Subject: RE: [TenTec] QSK with QSK-5PC
I believe I know why the previous owner did that to your Omni VI. (And I'm assuming you care!)
Last night I made some measurements of the TX Enable signal on the back panel of the Omni VI. This line goes low at the beginning of a dit or a dah, then the RF comes on, just as it should. There is no problem at the leading edge.
The problem is at the trailing edge. The TX Enable goes high again, but the RF doesn't shut off immediately, so there is a period of time when the QSK circuit in the amp is being told to go back to receive, yet there is still RF flowing. This is the problem.
What is needed is for this signal to stay low just a little bit longer, until the RF ends completely, then it can go high again to turn the diodes in the QSK unit back to receive. There is a signal that will do that in the Omni; it's called the relay, and that explains why your previous owner used this signal. This is the line that is affected by the front panel DLY.
I think I am going to do the same as your previous owner. That is, I'm going to bring out a line from the relay switching transistor, Q16 on the control board, bypass the relay, and use that as my QSK line. I don't know if it will work yet, but that is my next plan.
True QSK or full QSK, whatever you want to call it, is really hard to achieve with an amplifer. The way you guys speak about QSK on the reflector, you aren't happy unless you can hear the band between dits at 50 wpm, but that just isn't possible between an Omni and a cheap amp like an Ameritron, even with the QSK switch. About the only advantage the QSK switch affords you is the elimination of the mechanical relay in the amp.
Anyway, that's the way I see it. Thanks again for the information you gave me.
-----Original Message----- From: firstname.lastname@example.org [mailto:email@example.com]On Behalf Of Steve N4LQ Sent: Monday, November 08, 2004 5:54 PM To: firstname.lastname@example.org Subject: Re: [TenTec] QSK with QSK-5PC
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