[SBE] Question about an FM translator cavity filter --

[Bill Whitt]

Not that I know a huge amount about FM, but I wanted to relate to this issue
via the TV side. I had this problem when I lost my original channel number
to another company. I had to receive on 22 and transmit on 23. The original
unit I had on the mountain was a translator. I was having a heck of a time
setting up filters, adjusting my down convertor, and constantly adjusting my
forward power. One day, while I was lighting the match to burn down the
transmitter site ... I had an idea. I soon converted the turkey from a
translator to a transmitter ... using alternate devices to receive and break
apart my video and audio components. My figuring was if I was able to get it
from RF to its individual components ... I could clean them up and feed it
back into my transmitter stronger and tightened up. The result was better
than I could have imagined, plus I was able to eeekkk out more forward
power. Later on, I gained permission to relocate my receive antenna away
from the directional forward power of my transmit antenna. This improved my
situation that much more. I still have to watch my forward power ... but man
what a difference.

Hope this helps .. :-)

Bill Whitt

-----Original Message-----
From: sbe-bounces at sbe.org [mailto:sbe-bounces at sbe.org] On Behalf Of Mike
Langner
Sent: Monday, June 02, 2008 6:57 PM
To: sbe at sbe.org
Subject: [SBE] Question about an FM translator cavity filter --

Hello all !

I am working on improving the performance of an FM Broadcast Translator that
is using a Remec Wacom BPBR filter in its output.

The three cavity filter is model WP-715D-3, it is serial number 4515.  It is
set to pass 95.8 - 96.0, and to reject 95.4 - 95.6.

The translator receives on 95.5; it transmits on 95.9.  (Ouch !  Close
spacing!)

The filter exhibits about 6 to 7 dB loss on-channel.

Would anyone have catalogue info or a data sheet on this item?  I sent an
email to the manufacturer (sales at txrx.com) which was the only email address
I could find, and have received no answer after a week or so.  I understand
that TXRX is the successor-in-interest to Wacom, but perhaps I am mistaken
and someone can correct me.

Could some kind person please tell me if what I'm experiencing (waaaaay more
on-channel loss than I'd like) is what I should expect from this unit?

Thanks very, very much !

Mike Langner, CPBE
Albuquerque, NM
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