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Re: [TenTec] QSK with QSK-5PC

To: <tentec@contesting.com>
Subject: Re: [TenTec] QSK with QSK-5PC
From: "Tommy" <aldermant@alltel.net>
Reply-to: tentec@contesting.com
Date: Thu, 11 Nov 2004 17:10:28 -0500
List-post: <mailto:tentec@contesting.com>
'Figure of merit' ? I don't think so. The primary purpose of an amplifier is to amplify. QSK in an amplifier is a sometimes added luxury.

I think if you would get same Ten Tec manuals and study the schematics, you would understand how the Ten Tec QSK system works. It is the amplifier that keys the transceiver and the amplifier does not key the transceiver until all of the amplifiers relays are closed. Most Ten Tec amplifier vacuum relays have a closure time spec of 6 milliseconds.

In my opinion, the Alpha 87A, which uses PIN diodes for T/R switching would have to be the quickest amplifier with QSK. The Ten Tec line of amplifiers are no slouches. Even though they are not guaranteed to run QSK over 40 wpm, my Titan 425 handled 120 wpm quite well and my Titan 3 handles up to 80 wpm quite well. As for a 'really' good high speed QSK radio, my opinion is the Corsair II and the Icom IC-781, with the Omni 6 and the Omni 6 Plus coming in a very close second.

Tom - W4BQF

----- Original Message ----- From: <al_lorona@agilent.com>
To: <tentec@contesting.com>
Sent: Thursday, November 11, 2004 4:45 PM
Subject: RE: [TenTec] QSK with QSK-5PC

Depends on the amplifier's relay close delay time, doesn't it? That
assumes you're using the QSK loop and the amp relay is keying
the rig.
So, in this case, it would be a fixed value depending on the

73, Duane

Hi, Duane. Well, you've got an interesting point. If it's a fixed value, then as my CW speed increases, the relay delay time becomes a bigger and bigger percentage of my inter-dit time, and at some speed that will cease to be QSK.

This brings up a point. Maybe a figure of merit for an amplifier would be the maximum speed at which you can still hear in between dits.

I wonder which amp/rig combination is the fastest one out there right now? I was hoping that the QSK aficionados would have already run through every amp on the face of the earth and rated them according to this figure of merit.


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