I've looked into PAR filters, but I need to know the offending frequency. The
problems is that PBS broadcasts the same shows on TV channels 13 and 16,
therefore I don't know the exact frequency. Do I poke and hope that I guessed
the correct frequency? Is there something available that has a broader range
of application?

Thanks, I'll look at the site that you provided.

Regards.


In article , That Other George
wrote:
Dude get a filter http://www.stridsberg.com/ I live just south of you :-)
I work in Pitt and had to get a FM Notch Filter for the scanners in the
office, i.e. the federal building downtown :-) It works fine.


Its (The Dawn Soliloquy) wrote in
:

A freekin men (AMEN)

The 785 is destroyed by overload or intermod. I live in Pittsburgh
Pennsylvania U.S.A. not exactly the biggest city in the U.S.

I need to use a 1 inch antenna on the radio, no telescope, no outdoor,
nothing but the 1 inch antenna, otherwise I get to listen to the local
PBS television station on frequencies all over the radio, as well as
various pager signals.

Admittedly this is a problem here, but I can handle it well enough
with various Radio Shack scanners (I know, made by Uniden, but they
are older models), an Alinco, and a Yaesu VR-500, but, as with the
785D, my Yaesu VX-5R is devastated by intermod.

Also the weather radio in the 785D is a joke. I've been communicating
with Uniden and the Consumer Product Safety Commission to try to
understand if the weather radio feature is a design problem or if the
instructions are inadequate in the weather radio section.

Good luck, let us know what you decided.



In article om,
GeorgeF wrote:
Bob,
Its always nice to have as many channels as possible.

However I have both, actually 7 BC 780's and 2 BC 785's. As far as
the 785 does I really don't like the radio at all. It suffers from
FM overload which reduces the real world sensitivity and it also
suffers from intermod problems. Two things I have yet to have a
problem with on the 780's.

I would only suggest a 785 is if you NEED digital. The 785 does
digital just fine. The main reason I didn't sell my 785's is because
I use them to monitor the NASA Kennedy Space Center 400 MHz Digital
Trunk system. It does fine for this. However when it comes to trying
to pickout distant stations in the MilAir range (which is what 99% of
my listening is) the 785 sucks when compared to the 780.

You can see pictures of my 780's and 785's he
http://www.MilAirComms.com/shack.html

George
http://www.MilAirComms.com




Never say never.
Nothing is absolute.





Never say never.
Nothing is absolute.

I've looked into PAR filters, but I need to know the offending frequency. The

problems is that PBS broadcasts the same shows on TV channels 13 and 16,
therefore I don't know the exact frequency.

Hiya-
The three different Par models offer rejection in the 152, 158 and 462 MHz
ranges... and if I'm not completely off, over-the-air TV channels 13 and 16
fall outside that range (13 is in the range of 211-216 MHz, and 16 is in the
482-488 MHz range)... so Par may not be able to help you in your case.
You could try building your own stub-type filter, attaching a 'T' connector
inline with your antenna lead-in, and attaching a specific frequency-cut,
open-ended stub of 50 ohm coax to the 'T' section (perpendicular to the antenna
lead-in)... the formula to find the stub length should be:
(75/Freq. MHz) x 0.67 = Stub Length in Meters... I couldn't find a formula that
finds the length in inches, but I'm sure it's out there!
The exact freq's you need to notch out (I just found a book that has them) a
Ch. 13 Pic-211.25, Audio-215.75
Ch. 16 Pic-483.25, Audio-487.75
So you can see the commercially available Par filters probably wouldn't
ultimately reject the freq's you need to kill.
Try a search for home-built stub and notch filters. There are some ideas out
there.
Good luck-
Linus