Return to KLUBNL.PL main page

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

LF: QRP 1W /PA circuit

from [Stefan Schäfer] [Permanent Link][Original]
To: [email protected]
Subject: LF: QRP 1W /PA circuit
From: Stefan Schäfer <[email protected]>
Date: Wed, 11 Jan 2012 13:34:45 +0100
In-reply-to: <[email protected]>
References: <CAA8k23Qqo4ZagVGLdEiUqGSU-HL_XNpues+rPAr7NwOhiyd1zQ@mail.gmail.com> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
LF,

Last night i shot my PA again :-( No replacement FETs were available so i had to stay quite during the night. Replacement parts are ordered now and will arrive tomorrow :-)

During that time i will run a LF beacon on 136.172 kHz running 1W TX power in DFCW-90, starting in the afternoon. If someone can receive that weak QRPP signal, then a report is very apprechiated :-)

Also i will do some optimisations on my recently posted PA output stage (http://dl.dropbox.com/u/19882028/LF/DK7FC_137kHz_TX_antenna_and_PA_schematic.jpg), just in case someone wants to build a similar design and is interested in general:

-R= 100 Ohm/2W (In series with C, across  Drain-Source)
-C= 220pF/WIMA FKP-1 2kV  (In series with R, across Drain-Source)
-MOSFET: The IRFP460 will be replaced by a SPW20N60C3 :-)

73, Stefan/DK7FC
[More with this subject...]
<Prev in Thread] Current Thread [Next in Thread>
Previous by Date:  Re: LF: opera 137 beacon going, pat
Next by Date:  Re: LF: QRP 1W /PA circuit, Douglas D. Williams
Previous by Thread:  Re: LF: opera 137 beacon going, jrusgrove
Next by Thread:  Re: LF: QRP 1W /PA circuit, Douglas D. Williams
Indexes:  [Date] [Thread] [Top] [All Lists]