Thanks' Stefan, . bit late in the night
50 ? That's quite low , I was
expecting much higher ? that's for a
'large' system ? do you have a ball park
figure for the max frequency change on
that ?
1:1.5 > 5% reflected power , that
would reduce the b/w again ..
Tnx -G..
Sent: Sunday, March 04, 2012 1:09 AM
Subject: Re: LF: Permissible QSY limits for 136
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
