[Elecraft] RTTY and best IMD, cooling, etc

[Gary Gregory]

Listening from afar, most 1Kw signals are rarely "clean" with no audible
distortion. This said, it is often caused by bad adjustment by the
operators, poor quality equipment, badly set vox and the list goes on.

Recently I worked a G3 station who claimed he was running a PW-1 set at
around 700W output and this was one of the best sounding audio stations I
have heard recently.

That said, my preference would be to use the amp that will produce the
cleanest signal over distance so I would be inclined to go along with Dave's
(G4AON) suggestion.

73's
Gary

On Sun, Apr 11, 2010 at 4:53 AM, Dave, G4AON <elecraft at astromag.co.uk>wrote:

> Don the K3 PA and driver give some 10 dB better 3rd order IMD at around
> 1/4 power. While that shouldn't matter on RTTY it might on other data
> modes and does on SSB,. so for my money I would opt for a linear that
> needs 15 ~ 30 Watts of drive.
>
> 73 Dave G4AON
> K3/100 #80
> ----------------
> <SNIP>
> Intuitively it seems to me that the K3 might like the 15w or so, since
> the KPA3 is at the
> bottom of its range and the fans can help with the cooling, even though it
> is nearly 3 times the power needed to drive the 8410.
> <SNIP>
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-- 
Gary
VK4FD - Motorhome Mobile

K3 #679
For everything else there's Mastercard!!!