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] >> >> >> > > >
