Yeah your insertion loss is going to kill the performance of the link, why may I ask are you trying to do this other than the obvious reason of not wanting to hang 2 antennas. Why not just get a more efficient radio for the link like Aviat? We just bough our first aviat link to replace an AF11 link this week.
On Wed, Mar 25, 2020 at 3:07 PM <ch...@wbmfg.com> wrote: > Now that I think about it, this will not work without sharp bandpass > filters > on the transmitters. > To do what I have drawn here without the filters you would need a hybrid > combiner on the TX and you will lose another 3 dB in that. > > So 6 dB loss over all from one end to the other. > > -----Original Message----- > From: ch...@wbmfg.com > Sent: Wednesday, March 25, 2020 1:00 PM > To: Nate Burke ; af@af.afmug.com > Subject: AF11 custom combiner > > Nate, I am posting this to the list too. Want to see if I made a mistake > here. I don't have a ton of experience with the internals of the AF11. > I think each diplexer feeds a TX and an RX right? > Not sure how good the RX input filters are. So I used a splitter rather > than circulators. > > Circulators would have less loss but you have to have a pretty sharp > bandpass filter on the front of the receivers to do that trick. > You could add the filters. > > Not sure this will work without TX filters too but I think it will. > > -----Original Message----- > From: Nate Burke > Sent: Wednesday, March 25, 2020 11:15 AM > To: ch...@wbmfg.com > Subject: Re: Re: AF11 custom combiner > > Both paths are dual polarity v/h > SiteA > Radio1 TX 11505 > Radio2 TX 11225 > > SiteB > Radio1 TX 11015 > Radio2 TX 10735 > > Those are different Diplexers on the AF11 Radios 11015x11505 is the > high diplexer 11225x10735 is the low diplexer. If they were just > single pol licenses, I'm already doing that with 2 radios on 1 AF11 > dish, one radio on V one radio on H. > > Thanks, > Nate > > > On 3/25/2020 12:07 PM, ch...@wbmfg.com wrote: > > 10735 is pretty close to 11015. Would these be tx frequencies? > > Need to know what is RX and what is TX at this site. Also what is on > what > > polarization. > > -----Original Message----- From: Nate Burke Sent: Wednesday, March 25, > > 2020 10:55 AM To: ch...@wbmfg.com Subject: Re: AF11 custom combiner > > The boss is asking the questions, and in his mind it should be as simple > > as wire-nutting the 3 coax's together. So I have to follow up with why > > that won't work and present a solution for him. > > > > Channels we have are > > 11505x11015 (high) > > 11225x10735 (low) > > > > Thanks, > > Nate > > > > On 3/25/2020 11:10 AM, ch...@wbmfg.com wrote: > >> Yes, you can do that and it is lossy. > >> Circulators and splitters are frequently used. > >> Being high/low licenses makes things a bit more difficult. > >> > >> If you can give me details as to what radios and frequencies you want to > >> put on the AF11 dish I can think on it a bit. > >> > >> -----Original Message----- From: Nate Burke > >> Sent: Wednesday, March 25, 2020 9:44 AM > >> To: Chuck McCown > >> Subject: AF11 custom combiner > >> > >> Chuck, We've been using your AF11 REMEC adapters in a couple places. I > >> have a location where I can't physically add another Dish, but I do have > >> 2 licensed channels to the site. 1 high band and 1 low band. Is there > >> a way to combine 2 dual band radios onto the same dish? I already have > >> the AF11 dish installed, so if there was just a way to do a > >> splitter/combiner with the N Connectors, that would be ideal. I didn't > >> know if such a beast existed, or if it was something in your > >> engineering/production toolbag, or if it's technically impossible. > >> Maybe using the Coax would be too much loss, and the only way to do it > >> would be with a feedhorn combiner, and the remec adapters. I thought > >> this might be something that you would just know off the top of your > >> head. > >> > >> Thank you, > >> Nate Burke > >> Blast Communications > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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