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

[Bill Burckhard]

You might try talking to Microwave Filter Company. They might be able to
give you an idea if what you are seeing is normal for that sort of filter.
They may also have some solutions for you. 

William R Burckhard
445 South 24th Street West
Billings, MT. 59102
(406)652-4743
billb at khmt.com
www.yourbigsky.com 

-----Original Message-----
From: sbe-bounces at sbe.org [mailto:sbe-bounces at sbe.org] On Behalf Of Mike
Langner
Sent: Monday, June 02, 2008 7:57 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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