Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]
<prev [Date] next>
[Advanced]
 <prev [Thread] next>

LF: Re: AF Amps at 136

from [Hugh M0WYE] [Permanent Link][Original]
To: <[email protected]>
Subject: LF: Re: AF Amps at 136
From: "Hugh M0WYE" <[email protected]>
Date: Sun, 18 Oct 2009 21:58:26 +0100
In-reply-to: <AEFAF8DAD98D4571B7D80E689302E30E@IBM7FFA209F07C>
References: <AEFAF8DAD98D4571B7D80E689302E30E@IBM7FFA209F07C>
Reply-to: [email protected]
Sender: [email protected]
Hi Chris,
I used an OMP 100W amp for my brief sortie onto 136kHz. I never blew up any FETs, but never managed to get more than 50W out of it either.
Unless you want a linear mode go for the switching-on-and-off things they're much more efficient.
Hugh M0WYE
----- Original Message -----
From: Chris
Sent: Sunday, October 18, 2009 2:13 PM
Subject: LF: AF Amps at 136

Hi All,
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.
[More with this subject...]
<Prev in Thread] Current Thread [Next in Thread>
Previous by Date:  Re: LF: IK1HSS calling, John RABSON
Next by Date:  Re: LF: OR7T wspr, Andrey rn3agc
Previous by Thread:  Re: LF: AF Amps at 136, Graham
Next by Thread:  Re: LF: AF Amps at 136, Brian G3YKB
Indexes:  [Date] [Thread] [Top] [All Lists]