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. Dave WB7DRU Minnesota Sent from my android device. -----Original Message----- From: Greg D <ko6th.g...@gmail.com> To: Robert Coppock <robertinor...@webtv.net> Cc: amsat-bb@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? http://www.amsat.org/amsat-new/articles/Mode-J/ 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. Good luck, Greg KO6TH > > > > 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! ti! > ng it all together. grazie mille, Robert k f 0 g cn81 in the > woodwork, literally, > shasta/klamath national forests. > _______________________________________________ > Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
