Normally size is not a good determinate for quality. It just limits the input power. There are some good sub 50 watt out there. If you use those you should at least use a preselector. Really, if you are colocated at all you should.
On Wed, Jun 7, 2017, 7:51 PM Jaime Solorza <losguyswirel...@gmail.com> wrote: > Be the hero dude...fix it and move on.. > > On Jun 7, 2017 6:42 PM, "Chuck McCown" <ch...@wbmfg.com> wrote: > >> Helical resonator duplexers can be almost as good as quarter wave >> duplexers and much smaller. >> >> *From:* George Skorup >> *Sent:* Wednesday, June 07, 2017 5:56 PM >> *To:* af@afmug.com >> *Subject:* Re: [AFMUG] Interference on a repeater at 149 MHz >> >> We have a local school district co-located with us on a water tower and >> they're complaining about noise on their input. I pretty much told them >> they're SOL until we need to add or replace cables since they're all in an >> 1-1/4" PVC. So we'll have to run temp cables up, rip all the cables out of >> the pipe and pull new ones. The village said we have to be in conduit. And >> we do have a couple cables in use that aren't shielded. They didn't offer >> to pay for it, so too bad. >> >> They're running a Kenwood repeater in an outdoor cabinet. Maybe 12U. >> Obviously that's not going to fit the proper large can cavity duplexer like >> a Sinclair. Plus they have >4.5MHz split, so no doubt that let them use a >> smaller rack-mounted duplexer. >> >> So I'd be curious to know what the setup is on this 149MHz repeater. Are >> they using a small crappy duplexer with a large split, too? >> >> On 6/7/2017 5:55 PM, Lewis Bergman wrote: >> >> I don't think so. I am assuming they probably didn't install some >> connectors correctly. Unless they are using some extremely crappy gear the >> RF portions of all half decent repeaters are shielded very well. Unless >> they modified the repeater leaving some shielding off the connectors are >> the most likely source. I guess there could also be punctures or some such >> in the coax as well. >> >> On Wed, Jun 7, 2017 at 5:51 PM Jaime Solorza <losguyswirel...@gmail.com> >> wrote: >> >>> Lewis. You are assuming the VHF gear was properly installed...few folks >>> do right first time... someones laziness or lack of knowledge is another's >>> opportunity to make some cash >>> >>> On Jun 7, 2017 4:41 PM, "Lewis Bergman" <lewis.berg...@gmail.com> wrote: >>> >>>> Has anyone checked their connectors/connections between all RF points? >>>> Antenna to cable, cable to duplexer, duplexer TX/RX to repeater. >>>> >>>> Most of the time I have seen Two Way equipment either be interfered >>>> with or interfere with someone else it is a connector issue. The only other >>>> case I have seen issues should be able to be determined by an intermod >>>> study. I doubt it has anything to do with intermod. My bet is a faulty >>>> connector. I would assume it is the RX side so I would check the RX >>>> Repeater port to the RX port on the duplexer and then the rest of the >>>> connectors. >>>> >>>> Not saying it can't be the the CAT5, just that if all is good on the >>>> antenna system I haven't ever seen an issue and I have a lot of sites with >>>> both two way and 900, 2.4, and 5GHz operating on all kinds of speeds both >>>> POE and not. >>>> >>> >>
