If you are having the issue with the transmitter off and listening to the local speaker on the receiver than it is not your interface box.
I would try swapping the feedline around and see if the noise goes away. It might just be where you are placed on the tower. Remember RG-58 is very lossy. Corey N3FE On Tue, 23 Jun 2009, agrimm0034 wrote: > Tell me if this makes sense or if I will just waste my time. The homebuilt > controller I built and CAT 5 cables stripped inside of a plastic project box > and they are bare. The only other thing I know that half way makes sense is > that those cables are unshielded and when audio passes through them it could > be picking up the very strong signal being radiated around them. Remember the > PD tower is only about 1/2 mile straight shot away, very visible and they are > humming a good 75 watts of power. > > --- In [email protected], Corey Dean N3FE <n...@...> wrote: >> >> If you are not using a duplexer I wouldn't think you would have a problem >> using either feedline. The problem with the doubleshielded feedline is >> when in duplex operation. If you arten't using a duplexer I would switch >> the feedline around and put the rg-58 on the TX and the lmr400 on the >> receiver. That way it would be on the higher antenna and have less line >> loss. You still don't have decent seperation but if you are hearing the >> noise with the transmitter shut off then something else is getting in to >> the receiver. >> >> Corey N3FE >> >> On Tue, 23 Jun 2009, agrimm0034 wrote: >> >>> The receive radio has a 20 ft piece of RG-58 Belden and the TX radio has 40 >>> ft of LMR 400. After I had already purchased and installed the LMR braid >>> cable I then learned to my knowledge this was not recomended for duplex use >>> and it could cause noise and other problems but there is no LMR on the >>> receive end of the radio and it still does it when the TX radio is turned >>> off. >>> >>> >>> --- In [email protected], "Chuck Kelsey" <wb2edv@> wrote: >>>> >>>> Like Nate said, sounds like an intermod product with your transmitter being >>>> part of the mix. >>>> >>>> My standard question has become -- are you using any LMR400, 9913 or >>>> similar >>>> foil/braid coax anywhere in your system? >>>> >>>> Chuck >>>> WB2EDV >>>> >>>> >>>> >>>> ----- Original Message ----- >>>> From: "agrimm0034" <agrimm0034@> >>>> To: <[email protected]> >>>> Sent: Monday, June 22, 2009 11:24 PM >>>> Subject: [Repeater-Builder] Completly Stumped on Noise (UHF Repeater) >>>> >>>> >>>>> This noise in my repeater has me completly stumped. I've tried everything >>>>> I know possible to make it stop but nothing has helped. Here are some >>>>> quick specs on what my repeater is... >>>>> GMRS repeater RX 467.600 TX 462.600 DPL 054 TX 30 watts. >>>>> >>>>> My local repeater when I key opens up to a scratchy noise with the local >>>>> police department in the background. It ONLY opens up when they key up the >>>>> same time my repeater is being keyed. It is not perfectly clear it is >>>>> scratchy but I have no idea how they are squeezing in on myn. I did find >>>>> there frequency's and location of there repeater so mabye someone can help >>>>> tell me what is wrong. Here is the Police Dept Repeater Details... >>>>> PD Repeater - RX 460.4500 TX 465.4500 PL 6A 75 watt. (There tower is also >>>>> located directly across from mine roughly 1/2 mile horizontally >>>>> separated.) >>>>> >>>>> I've also tried changing my frequency and PL tones and it still has not >>>>> made one bit of difference. I'f someone could help me out I'd gladly >>>>> appreciate it. Thanks >>>>> >>>>> >>>>> >>>>> ------------------------------------ >>>>> >>>>> >>>>> >>>>> Yahoo! Groups Links >>>>> >>>>> >>>>> >>>> >>> >>> >>> >> > > >
