Well just for your information, I run a FT-7900 & FT-2900 right next to each other to a 10 elem Diamond 70cm and a 5 elem Diamond 2m both pretty close to each other and have never had a single problem. Considering you are transmitting on 145.850 and receiving on 436.795... Hello, a world apart there and you are only using 5 watts. You will not have a problem and you will not even need a duplexer with the two hand helds. Two radios, Two antennas, Two pieces of coax. True Full Duplex.... :)
Kevin KF7MYK > Date: Sat, 2 Jun 2012 14:53:27 -0500 > From: wb7...@usfamily.net > To: ko6th.g...@gmail.com; robertinor...@webtv.net > CC: amsat-bb@amsat.org > Subject: [amsat-bb] Re: full duplex w/ 2 HT's > > 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 _______________________________________________ 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
