----- Original Message -----
Sent: Sunday, October 18, 2009 2:13
Subject: LF: AF Amps at 136
Just started constructing TX for 136kHz, noticed
Maplin do a Velleman audio PA kit that is rated at 200W (100W RMS into 4R). OK
there's no mains transformer or heat sink, but reckon it's good value at
£14.99. Point is the specs also say the minus 3db frequency response is
3Hz / 200kHz.
The RSGB books 'LF Today' refer to using audio
amps as PAs at 136 with 'a few modifications'. Does anybody know where these
modifications are documented? I guess there's nothing major, reduce a few cap
values? Remove Zobel Network etc.?? If anyone has experience with this
approach I would appreciate some hints. Thanks.
Chris, G4AYT, Whitstable.
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