[MilCom] Southern MD Audio Log Notes (05/15/04)

[Jeff]

Lyn,
Thanks for the Feedback.

It was recommended to me to contact PAR Electronics and talk to Dale about
Filters, which I intend to do. I don't plan to buy anything to fix this at
this point as the trouble seems isolated to one freq. If the same problem
manifests itself on any other freqs and the range, I was most likely work
toward minimizing it. I do want to go through the motions now on researching
possible fixes though, just for the knowledge gained.

Thanks for the thought though. If the time comes that I do see the need to
correct this, I might have to switch scanners around and see if the same
problem persists on the other rigs. Currently I am seeing the problem on a
Pro-2035 w/OS535 board installed. Maybe later a try on the PCR-1000 might be
worth a try.

Take it easy,
Jeff 

> -----Original Message-----
> From: milcom-bounces at mailman.qth.net [mailto:milcom-
> bounces at mailman.qth.net] On Behalf Of lrk
> Sent: Saturday, May 15, 2004 10:35
> To: Jeff
> Cc: milcom at mailman.qth.net
> Subject: Re: [MilCom] Southern MD Audio Log Notes (05/15/04)
> 
> On Sat, May 15, 2004 at 09:04:30AM -0400, Jeff wrote:
> >
> > 138.875
> > Well, I am tired of messing with this one. I must have had over an hours
> > worth of recorded audio from a Cell Site Sub-Harmonic. Seems to be this
> new
> > SINGULAR Cell Phone net as a few times people Dialed information and the
> > Operator stated Singular. They must have put some antennas up on one of
> the
> > towers nearby.
> 
> This is a common problem with the PRO-20## series radios, maybe others.
> It is due to the various frequencies involved in the radio. Recent
> scanners
> are supposed to be less of a problem to reduce ways of monitoring cell
> phones.
> 
> These plastic radios can receive right thru the case so some freqs get
> thru even with filters on the co-ax. The only way to fix this is thru
> experimentation to determine how it happens.
> 
> If it is coming in on the co-ax connector, a low-pass filter for about
> 400 MHz would work. If it leaks in thru the case, wrapping it in aluminum
> foil might work.
> 
> But it is probably your scanner, not the cell site that is at fault.
> 
> 
> For you techies out there:   (139 + 610) * 2) - 610 = 888 Mhz
> 
> 
> --
> -------------------------------------------------------------------------
> | 73,            E-mail       | milcom at ovillatx.sytes.net               |
> | Lyn Kennedy                 |                                         |
> | K5QWB          ICBM         | 32.5 North 96.9 West                    |
> ---Livin' on an information dirt road a few miles off the superhighway---
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