Yep, however the chart does have warnings. I just wanted to take a close look.
From: Bruce Robertson
Sent: Tuesday, February 24, 2015 11:12 AM
To: af@afmug.com
Subject: Re: [AFMUG] 711Mhz carrier?
They let you get that close in Class B? Hmmm...
On 02/24/2015 09:00 AM, Chuck McCown wrote:
Probably 300 feet but probably right in the center of the lobe too.
From: Ty Featherling
Sent: Tuesday, February 24, 2015 9:40 AM
To: af@afmug.com
Subject: Re: [AFMUG] 711Mhz carrier?
Cool. How far from it did you get?
-Ty
On Tue, Feb 24, 2015 at 10:38 AM, Chuck McCown <ch...@wbmfg.com> 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
Sent: Tuesday, February 24, 2015 9:28 AM
To: af@afmug.com
Subject: Re: [AFMUG] 711Mhz carrier?
What happened?
-Ty
On Tue, Feb 24, 2015 at 10:25 AM, Chuck McCown <ch...@wbmfg.com> 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
Sent: Tuesday, February 24, 2015 9:23 AM
To: af@afmug.com
Subject: Re: [AFMUG] 711Mhz carrier?
1mil Watts? Whoa!
-Ty
On Tue, Feb 24, 2015 at 10:07 AM, Bill Prince <part15...@gmail.com> 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
Sent: Monday, February 23, 2015 5:14 PM
To: af@afmug.com
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" <pkr...@unwiredltd.com>
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
3rd 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
Desk: 510-868-1614 x100
Mobile: 510-207-0000
pkr...@unwiredltd.com
!DSPAM:2,54ecae1d282581898217438!
