Yes it can be done with the right stuff. We had several DB 4-port combiners feeding into a bandpass duplexer with a receive multicoupler on the other side of the duplexer. In our case, insertion loss was quite high due to close spaced frequencies, 75 KHz. Notch type filters will not do it. Now, if your budget can't afford 8K, Maybe we can make a deal on my Celwave 4-port combiner.
Bill KB1MGH ________________________________ From: Maire-Radios <maire-rad...@verizon.net> To: Repeater-Builder@yahoogroups.com Sent: Mon, February 15, 2010 7:02:08 PM Subject: Re: [Repeater-Builder] Question for the group have been using TX RX for years on a number of tower sites. ----- Original Message ----- >From: Brian Raker >To: Repeater-Builder@yahoogroups.com >Sent: Monday, February 15, 2010 7:59 PM >Subject: Re: [Repeater-Builder] Question for the group > > >Telewave Wireless will set you up with a 4-channel 450MHz 150 watt low-loss >combiner for ~8k. > >http://www.telewave.com/pricelist/106-450combiners.html > >-Brian / KF4ZWZ > > >On Sun, Feb 14, 2010 at 9:17 PM, <k7...@skybeam. com> wrote: > > >> >> >>We use many ham and commercial repeaters using the same antennas, but require >>the proper filtering. A mobile duplexer is not sutable for what you are >>trying to do here. You can get a transmit combiner Hybrid or cavity for the >>transmitters and use a receiver multicoupler that has a dual window one for >>the ham receive and one for the commercial receive or use a cavity combiner >>for the receiver. That was is my preferred method, more isolation but costs >>much more. >> >> >>Mike Mullarkey K7PFJ >>6886 Sage Ave >>Firestone, Co 80504 >>303-736-9693 >> >> >> ________________________________ >>From:Repeater-Builder@ yahoogroups. com [mailto:Repeater-Builder@ >>yahoogroups. com] On Behalf Of Merrill >>Sent: Sunday, February 14, 2010 6:30 PM >> >>To: Repeater-Builder@ yahoogroups. com >>Subject: [Repeater-Builder] Question for the group >> >> >>I have a very broad band uhf antenna on a tower . I would like to run a >>440 MHz machine and a 462 MHz machine off of the same antenna . Can I >>use a notch type mobile duplexer to combine the 2 machines to 1 ant for >>both TX and RX to notch the respective TX freqs after the duplexers >>that are on the 2 machines . >> >>Merrill >>KG4IDD >> >> >> > > > >
