Cool. How far from it did you get? -Ty
On Tue, Feb 24, 2015 at 10:38 AM, Chuck McCown <[email protected]> wrote: > All the aircraft radios noised up and became unusable and I was in > class B airspace at the time flying with a clearance. > > *From:* Ty Featherling <[email protected]> > *Sent:* Tuesday, February 24, 2015 9:28 AM > *To:* [email protected] > *Subject:* Re: [AFMUG] 711Mhz carrier? > > 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] >>>> >>>> >>>> >>> >>> >>> >> > >
