Re: LF: My 500kHz 10W Transverter is almost ready

To:	[email protected]
Subject:	Re: LF: My 500kHz 10W Transverter is almost ready
From:	Roger Lapthorn <[email protected]>
Date:	Sat, 20 Oct 2012 20:17:24 +0100
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Thank you for your kind words Steiner.

There are a couple of errors on my schematic that I must correct (T50-2 red, not T50-6 yellow in the buffer and the wrong value of coupling cap between the LO and buffer). I measured the harmonic output on a friend's spectrum analyser today. If you are not using a sharply tuned antenna like a loop or short Marconi (like me) then I recommend adding an additional low pass filter on the output. The one on GW3UEP's page would be ideal. (6n8s and a 15uH inductor).

73s
Roger G3XBM

On 20 October 2012 19:15, Steinar Aanesland <[email protected]> wrote:

Hi all,

My 500kHz 10W Transverter is almost ready (just a little cosmetic
remains) .
https://dl.dropbox.com/u/16381257/MF_transverter.jpg

A big thanks to Roger G3XBM for this nice and simple design.
https://sites.google.com/site/g3xbmqrp/Home/472khz-transverter

I don't have the the right equipment for testing the output, but the 15W
50ohm dummy load is getting really hot .

The big issue now is the antenna. My first thought was a kind of a T(
top hat)-antenna, but I have a loop antenna about 80 meter in
circumference and 6/7 meter above the ground . What about using the loop
as a capacity on the top of a vertical or using the loop as an ordinary
loop antenna for 600m ?

--
LA5VNA Steinar
loc:JO59jq
Mal and spam filtering: STRONG
www.opera.no

--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
https://sites.google.com/site/sub9khz/
http://qss2.blogspot.com/

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