What happened? -Ty
On Tue, Feb 24, 2015 at 10:25 AM, Chuck McCown <[email protected]> wrote: > EIRP. > That is a 100 kW transmitter and a 10 dB antenna. > Don’t fly your plane too close to those. I did it once. > > *From:* Ty Featherling <[email protected]> > *Sent:* Tuesday, February 24, 2015 9:23 AM > *To:* [email protected] > *Subject:* Re: [AFMUG] 711Mhz carrier? > > 1mil Watts? Whoa! > > -Ty > > On Tue, Feb 24, 2015 at 10:07 AM, Bill Prince <[email protected]> wrote: > >> I read somewhere about lots of intermod issues with the transition to >> DTV a few years back. Probably more pronounced with the kind of power >> levels they are using on some DTV stations. I know that at least a couple >> of DTV stations are transmitting at 90 dBm up on Sutro in SF. >> >> bp >> <part15sbs{at}gmail{dot}com> >> >> >> On 2/24/2015 6:24 AM, Chuck McCown wrote: >> >> The inadvertent diode story has been around for a long time. I think >> it was much more of a problem when you had two broadcasters at a site where >> the difference between their frequencies was on a 2 way FM repeater input >> frequency. Every active electronic device on the whole site could do the >> same thing. Remember how everyone used to obsess about intermod products >> at tower sites. Doesn’t seem to be much of a problem any more. Or perhaps >> it is but we are all on cell phones now. >> >> *From:* Bill Prince <[email protected]> >> *Sent:* Monday, February 23, 2015 5:14 PM >> *To:* [email protected] >> *Subject:* Re: [AFMUG] 711Mhz carrier? >> >> Oh I know. Our tower manager at Black Mt. goes semi-ballistic when he >> sees anything on the tower that is not HDG or stainless or silicon-bronze. >> Then tells the story of rusting bolts/nuts/washers turning into diodes in >> the presence of higher-power RF. I don't know how high the power needs to >> get, but we have seen some interesting side-effects on unshielded cable and >> other unshielded components. >> >> bp >> <part15sbs{at}gmail{dot}com> >> >> >> On 2/23/2015 4:04 PM, Jaime Solorza wrote: >> >> Noise can come from most unexpected places. CQ rag had a story on spark >> plug caused noise on motorcycle knocking out a satellite system on bank >> building. Chucks advise is good >> And that would be my first step >> >> Jaime Solorza >> On Feb 23, 2015 3:08 PM, "Peter Kranz" <[email protected]> wrote: >> >>> Had an AT&T contractor show up at one of our datacenter sites today >>> and claim that one of our radio systems was emitting a carrier at 711Mhz >>> and he pointed at where we have a Dragonwave Compact 18Ghz system and >>> Redline AN-80i 5Ghz system mounted on the building. >>> >>> >>> >>> 711Mhz doesn’t sound like an IF of either of these systems to me, but >>> I’ve got tickets in with the equipment manuf. It looks like they are some 3 >>> rd party AT&T has sweeping buildings downtown. Anyone dealt with these >>> guys before? He told me he measured a -87 with his directional antenna 10 >>> feet away from the equipment and acted like that was a really big deal, >>> sounds like a pretty low level to me honestly. Anyone know what the legal >>> limits for spurious emissions are in the 700-800Mhz band? >>> >>> >>> >>> >>> *Peter Kranz*Founder/CEO - Unwired Ltd >>> www.UnwiredLtd.com <http://www.unwiredltd.com/> >>> Desk: 510-868-1614 x100 >>> Mobile: 510-207-0000 >>> [email protected] >>> >>> >>> >> >> >> >
