Ok just asking, because we had interference coming from either a bad connector on an LMR-600 cable and/or a bad switch. The interference must have been traveling through the power circuits and causing interference, not to a channel 7, but to fire department radios that we are co-located with on a water tower.
---------- Original Message ---------------------------------- From: Sam <[EMAIL PROTECTED]> Reply-To: [EMAIL PROTECTED] Date: Fri, 14 Nov 2003 07:37:35 -0600 (CST) >The 110 vac is inside the store (and at the other tower, inside the little >bld at the bottom of the tower). The power shot plugs into a hub there, >and utp CAT 5 goes from there up to the radio. From the radio there is >about a five foot piece if LMR-400 going to the omnis. > >The interference is coming from the CAT 5 after it leaves the powershot, >all the way up to the radio, and from the radio itself. (This was >confirmed with a spectrum analyzer). There is nothing coming from the >LMR-400 nor is there interference coming form the omni. > > > >On Fri, 14 Nov 2003, Stuart Pierce wrote: > >> Is that ethernet coming from the APPO to inside the store ? Also what is >> the cable between the APPO and the omni ? Does the ethernet go into a >> switch/hub/router ? >> >> ---------- Original Message ---------------------------------- >> From: Sam <[EMAIL PROTECTED]> >> Reply-To: [EMAIL PROTECTED] >> Date: Thu, 13 Nov 2003 22:51:37 -0600 (CST) >> >> >Hi Everyone >> > >> >Here's one I haven't seen here before..... >> > >> >I am in the process of expanding into a new town. The company who's tower >> >I'm using for my APPO is telling me that when my APPO is powered on it >> >interferes with their TV reception - specifically channel 7 (VHF). >> > >> >I don't know how 2.4 GHz would bother channel 7 (which is what, 140 MHz?) >> >but I know the guy who owns the tower, and he woudn't make this up. Plus >> >he is sharp with computers/electronics. If he unplugs the power to the >> >APPO the signal instantly clears up. Plug the APPO back in and channel 7 >> >becomes unviewable. >> > >> >This is important because his business is a TV store and he uses the >> >off-air signal (channel 7) to demo new televisions to his customers. >> > >> >The tower is set up like this: >> > >> >| >> >My Omni Antenna >> >| >> >| 10 feet >> >| >> >------- His TV Antenna >> >| >> >| >> >| 60 feet >> >| >> >| >> >| >> >| >> >Building with TVs for sale in it >> >------------------------------- >> > >> >My omni antenna is horizontally polorized, 12 dB. There are no amps on my >> >stuff. >> > >> >Are there any filters I can get or anything I can do to help prevent this? >> >I can move my antenna to a different location in town as a last resort, >> >but I'd really like to keep it where it's at. But the guy's main business >> >where it's at now is selling televisions, and leaving it as-is is not an >> >option. Would putting the TV antenna above the omni make any difference? >> >Is there anything else I can to to prevent the interference? >> > >> >Thanks Everyone! >> >Sam >> > >> >Update: I also found out that I'm knocking out Channel 7 all over the >> >town. (One of my APs is on the local television tower.....) If I can't fux >> >this I'll have to move that one too, and that would be devastating. :( >> > >> >--- >> >[This E-mail scanned for viruses by Declude Virus By Avolve.net] >> > >> > >> --- >> [This E-mail scanned for viruses by Declude Virus By Avolve.net] >> > >--- >[This E-mail scanned for viruses by Declude Virus By Avolve.net] > > --- [This E-mail scanned for viruses by Declude Virus By Avolve.net]
