[amsat-bb] Re: full duplex w/ 2 HT's
wb7dru at usfamily.net
wb7dru at usfamily.net
Sat Jun 2 12:53:27 PDT 2012
I am not sure that the filtering from the small duplexer with the Arrow is significant enough compared with the injection loss that it will produce.
I would try it first plumbed first directly into each radio. In this case the biggest issue will front end overload of the rx portable, I have not had problems when I tried it using FT817 and a Yesau handheld.
Sent from my android device.
From: Greg D <ko6th.greg at gmail.com>
To: Robert Coppock <robertinorbit at webtv.net>
Cc: amsat-bb at amsat.org
Sent: Sat, 02 Jun 2012 12:07 PM
Subject: [amsat-bb] Re: full duplex w/ 2 HT's
If I understand your wiring, I think you have it correct.
Is this what you are trying to do?
Note that for mode-B satellites where you are transmitting on 70cm and
receiving on 2m, this won't work. In my experience, the extra filtering
is also not needed there.
> 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 get!
> ng it all together. grazie mille, Robert k f 0 g cn81 in the woodwork, literally, shasta/klamath national forests.
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