On Sunday 01 July 2007 15:59, James Moritz wrote:
> Dear Claudio
>
> > I've observed that when SAQ key was up on my PC screen I can see a very
>
> weak
>
> > signal, as some carrier leakage.
> >
> > Any info about SAQ key-up ERP radiated?
>
> The SAQ alternator runs continuously, and is keyed by using a magnetic
> amplifier (saturating reactor) to short circuit the alternator output when
> the key is up. However, the impedance of the reactor does not actually
> reach zero, so some power is radiated. It is usually about 20 - 25dB down
> on the key-down signal level.

20 - 25 dB less than power out 200 kW. So 2 kW and a giant antenna are good 
for QRSS QSO at 17 kHz in Europe ;-) 

We should ask to borrow SAQ antenna and try below 9 kHz, in the unassigned 
band ;-)

> At my QTH it is usually audible when SAQ is 
> running but not sending, and you can hear the pitch of the CW note
> decreasing when the TX is shut down.

I've noted the decreasing pitch in 2006, to day the pitch was stable, for me.

TNX Jim and 73

Claudio, ik2pii

-- 
Claudio Pozzi  -  Happy Linux User  -  http://www.qsl.net/ik2pii

 
 
 
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