[amsat-bb] Re: full duplex w/ 2 HT's

Ronald Nutter ron.nutter at networkref.com
Sun Jun 3 14:17:07 PDT 2012


I have used a duplexer on the UHF side of my satellite ops for several 
years.  I find that some radios have more of a desense problem than 
others.  Here is a link to my website where I briefly talk about what I 
do on portable ops and using what is referred to as a Mode J filter - 

Ron Nutter
AMSAT Area Coordinator for Missouri

On 6/2/12 11:33 AM, Robert Coppock wrote:
> hola,   i am trying to determine the best way to work full duplex on the birds with 2 HT's or radios.   i cannot find any info so far on the web. my concern is to keep the transmit power out of the receive radio, i guess basically the difference between a diplexer and duplexer. since i am efficient (lazy) i thought i would just look for suggestions here while i am checking google also.    what do i need, di/du/ plexer, and what is the correct wiring scheme ?  i will be using the arrow antenna without the built in duplexer, from the 2 feeds (vhf/uhf)  and 2 HT's for now.  my picture of it so far, is to wire the vhf radio direct to the vhf feed port on the arrow, and have the uhf port on the arrow come into a duplexer, with the duplexer uhf port going to the uhf radio, and the duplexer vhf port terminated into a 50 ohm dummy load.   also, any suggestions of specific duplexers would be appreciated. i think i started on this project a few years ago, but never got around to getti!
>   ng it all together. grazie mille,   Robert   k f 0 g    cn81   in the woodwork, literally,                                                shasta/klamath national forests.  		 	   		
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