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Re: LF: Permissible QSY limits for 136

from [Stefan Schäfer] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Permissible QSY limits for 136
From: Stefan Schäfer <[email protected]>
Date: Sun, 04 Mar 2012 02:09:15 +0100
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Am 04.03.2012 02:01, schrieb Graham:
Permissible QSY limits for 136
 
Q what  is the  average  Q   of  a   136 Khz  Ae  system  ? (back garden  + larger)

Maybe arround 50.

 
Q What  would the  maximum  acceptable  change  in frequency   +/-  Fo   before  swr  considerations  became a problem , say   10%  reflected  power  1 :2  swr ? ....
That depends strongly on the PA circuit. A class E is very critical. A H bridge has almost no problems at all (just lower output power then). I would stay below 1:1.5 if the output power is 70% or above.

73, Stefan

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