Message	Date	From	Subject
6929	2011-11-28 08:48:47	Markus Hansen	Re: Smooth audio T/R switching and Hybrid Cascade IF and S meter cct
I built a TR circuit for my homebrew transceiver which was subsequently published in QEX which is very smooth and thump free. Here is a direct link to the article on my web page at: http://www.ve7ca.net/HBR/HBR/Perf_QSK_QEX_Mar06.pdf I found I no longer need to use a reed relay to disable to the VFO input to the mixer on transmit since I replaced my old IF with W7ZOI Hybrid Cascade IF design. My new IF and Audio circuits are also on my web page now at: www.ve7ca.net/Hbr200.htm I added an additional stage to the IF circuit as I wanted more IF gain and control of the AGC range. Also the S meter circuit is vey simple. Hope this is of some help. 73 Markus Markus Hansen VE7CA North Vancouver, BC CANADA WEB: ve7ca.net [Non-text portions of this message have been removed]

I built a TR circuit for my homebrew transceiver which was subsequently published in QEX which is very smooth and thump free. Here is a direct link to the article on my web page at:

http://www.ve7ca.net/HBR/HBR/Perf_QSK_QEX_Mar06.pdf

I found I no longer need to use a reed relay to disable to the VFO input to the mixer on transmit since I replaced my old IF with W7ZOI Hybrid Cascade IF design.

My new IF and Audio circuits are also on my web page now at:

www.ve7ca.net/Hbr200.htm

I added an additional stage to the IF circuit as I wanted more IF gain and control of the AGC range.

Also the S meter circuit is vey simple.

Hope this is of some help.

73 Markus

Markus Hansen VE7CA
North Vancouver, BC CANADA
WEB: ve7ca.net

[Non-text portions of this message have been removed]