[BC] Moseley Starlink SL9003Q Interference Fix

[borchert, mark]

Ran into the same problem using PCL 6000 series at one of our FM sites.
With the spectrum analyzer we could see all kinds of signals dumping in
on us. We would go down the road 15 miles to another site and it would
be clear as a bell. It would come and go at will, no weather patterns or
seasonal changes could be used as predictors.

Installing a filter for us didn't help as the incoming signals were
right around and on top of us. 

Changed the polarity of the STL dishes to horizontal (the same as the
other site) and it went away. Been problem free for almost a year. Some
off air time, tower climber fees and STL license change and it was all
good.

Mark Borchert
Chief Engineer Go Radio LLC
2720 7th Avenue South
Fargo, North Dakota
58103
1-701-237-4500 (office)
1-701-238-7467 (cell)
1-701-235-9082 (fax)


 



-----Original Message-----
From: broadcast-bounces at radiolists.net
[mailto:broadcast-bounces at radiolists.net] On Behalf Of R. V. Zeigler
Sent: Wednesday, May 07, 2008 4:13 PM
To: broadcast at radiolists.net
Subject: [BC] Moseley Starlink SL9003Q Interference Fix

We had a real problem with our Starlink STL that had us to the point of
reverting to analog. There were a few card problems that Moseley did get
fixed for us, but we still continued to have intermittent audio drop
outs. We found a high BER count, which was an indication of something
causing us interference. We tried the Crescend amplifier, the Moseley
bandpass filter, and increasing error correction in the receiver, all to
no avail. Sending the units back to Moseley did not help as they worked
perfectly both there and here on the bench. I asked Dave Chancey at
Moseley about a frequency specific bandpass filter and was directed to
Jeff Sloane at Integrated Microwave Corporation. IMC built us one of
their frequency specific filters (with a money-back guarantee if it did
not work for us). We have had it in for a week now, and have experienced
no dropouts. Our site has become a real "RF Soup Bowl" and while analog
could overcome the interference, our digital could not. We did spend
time looking for interference, but the SA yielded no quality results. If
we run into problems again, I will report it, but for $500-$600 it
allowed us to use our digital STL in a really noisy environment. A big
THANKS! to Dave and Jeff.
Rod

--
R. V. Zeigler, Dir. of Eng.
Nebraska Rural Radio Assn.
KRVN-KTIC-KNEB
1007 Plum Creek Parkway
Lexington, NE. 68850-0880
rzeigler at krvn.com