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Message-ID: <002501c8eaa0$ee4f4ae0$0401a8c0@lindavideo>
From: "Ken" <ken.h.wright@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <c0e.370c4fbd.35afb639@aol.com> <006e01c8e788$ca7394c0$0900a8c0@AM> <20080717110533.ji3so2ex15i0w8ok@webmail4.kuleuven.be> <487F2369.3701.24D39C@mike.dennison.ntlworld.com> <001901c8ea7c$5c51fb20$0401a8c0@lindavideo> <fc7eccec0807201044k21a632b7r23059c9fc2c914f@mail.gmail.com>
Date: Sun, 20 Jul 2008 20:43:44 +0100
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Subject: Re: LF: Re: LF RadCom Articles
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Hi Andy.
A simple L C L circuit as described in the Solid State Design for Radio 
Amatuers Book, but I made the 'C' variable so I can tune it up in a similar
manner to that of  PI tank circuit. I dont have any CAD for diagrams, all 
the pcb artwork was done by hand, I had a bit of techniacl smoke with the 
first PA a few dead power MOSFETS on the shack floor, but a chat with Chris 
G3XIZ and it was sorted out. Technical writing is ok as I used to write 
technical specifications and technical trial reports at BT.

73

Ken    M0KHW

----- Original Message ----- 
From: "Andy Talbot" <andy.g4jnt@googlemail.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Sunday, July 20, 2008 6:44 PM
Subject: Re: LF: Re: LF RadCom Articles


> Send it in - sounds just like the sort of simple 'weekend' article
> several technical editors have been asking for.
>
> btw.  By LCL output stage, assume you mean a lowpass Tee network?
>
> Andy G4JNT
> www.scrbg.org/g4jnt
>
> design
>> and build our own equipment, but do not submit it for possible 
>> publication
>> because, state of the art technology it is not, the design is not
>> particularly elegant, and the Technical Editor and the more accomplished
>> contributors would fall over laughing when they saw it. But most of these
>> projects are practical and they work. I work on the KISS (Keep It Simple
>> Stupid) principle, don't use three components when one will work just as
>> well. My 500kHz TX does not have any fancy CW sidetone circuit on 
>> transmit,
>> just a piezo buzzer wired across the keyed 12v line to the driver board, 
>> the
>> most complicated bit is the LCL output stage, which delivers 23W into a
>> 50ohm dummy load and 900mA up the antenna, the TX/RX switching is like 
>> the
>> old days, a simple toggle switch.
>
>
> --
>