[PVRCNC] WUNC-DT update

[Kent Winrich]

Yeah they are running 1MW erp.  Visual power TPO (Transmitter Power Output)
is about 62kW if I remember.   I have pictures of the combiner for the FM
stations on the John Hancock tower in Chicago somewhere.  It is more of a
plumbing job than it is RF. LOL.  Having installed 3" copper rigid line (not
Heliax) you spend all of your time cutting and measuring and smoothing.

I have been out to the WRAL/WRAZ et al transmitter site a number of times.
Heh, if you guys are real nice to me... perhaps the group would be
interested in a meeting out there for a tour?  I can get the ch 22/28 chief
(who is a ham) or one of the other guys to get us out there... I think.

Heck I am more interested in the WPTF site.  The chief is a new ham as well.

Kent
K9EZ/4


On Mon, Jul 27, 2009 at 1:34 PM, Guy Olinger <Guy.Olinger at sas.com> wrote:

> I note that 12 Mhz bandwidth dual adjacent channel antennas are in the mix.
> I suppose that is what WRAL/WRAZ is running (48/49). I'd love to see the
> power combiner, or is there some kind of trickery for that?  Seen some lists
> that indicated WRAL running megawatt ERP.  That true?
>
> -----Original Message-----
> From: pvrcnc-bounces at mailman.qth.net [mailto:
> pvrcnc-bounces at mailman.qth.net] On Behalf Of Kent Winrich
> Sent: Monday, July 27, 2009 11:05 AM
> To: Brian Alsop
> Cc: PVRCNC
> Subject: Re: [PVRCNC] WUNC-DT update
>
> Wellllllll they are very high gain antennas.  But -- Just My Humble opinion
> - What were they doing for the past couple of years that prevented them
> from
> having an decent antenna on the top like every other broadcaster??
>
> This is probably the antenna they are using:
> http://www.eriinc.com/pubs/20090317021_AEN01w.pdf
>
> And yes as broadcasters, we do lower the power for the crews.  Most crews
> carry RF detectors so they know when they are at their limit of RF
> exposure.
>
> Crawling back into my hole...
>
> Kent
> K9EZ/4
> ab0zo.com
> b0zo #143
>
>
> On Mon, Jul 27, 2009 at 7:41 AM, Brian Alsop <alsopb at nc.rr.com> wrote:
>
> > And you thought UHF antennas were small and light....
> > ---------------------------------------------------------------------
> > ..... we are working on out WUNC-TV channel 4 transmitter site in
> Northern
> > Chatham County.  Basically,what we have to do is remove the analog
> channel 4
> > antenna from atop the 1400' tower and replace it with the new digital
> > antenna and brace weighing 15 tons.....  In order to stay on the air
> during
> > this period, we must operate on a lower antenna with reduced power levels
> to
> > protect the tower crew from the effects of harmful radiation.
> >
> > The antenna work is very dangerous and tedious work that is done mostly
> by
> > hand while the tower crew suspended from the 1400 foot tower. Our first
> > priority is the safety of the tower crew.... .We hope to be back before
> the
> > end of the summer.......
> > ---------------------------------------------------------------------
> >
> > I guess they are concerned about RF exposure.  First rule, don't
> > "microwave" the installers.
> >
> > 73 de Brian/K3KO
> >
> >
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