Re: [TenTec] QSK with QSK-5PC

["Tommy" <aldermant@alltel.net>]

'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
> individual
> amp.
>
>         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.

Al  W6LX

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