He can’t hang another antenna. From: Kurt Fankhauser Sent: Wednesday, March 25, 2020 1:11 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] AF11 custom combiner
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 -------------------------------------------------------------------------------- -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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