[BC] Moseley Starlink SL9003Q Interference Fix

[John Burger]

Yup, same problem with our 9003Q.  Went through everything you did, but the
BER drops came back after a while.  (BTW, our Paraflector is hanging on the
hottest tower of a 50 kW AM)  Lower power to 40 kW and the drops stop.
After a while it became obvious that the high BER coincided with hot, high
frequency audio (crashing cymbals, screaming guitar, etc.).  Limited
bandwidth to 5 kHz and have experienced no audio drops since.  So many
solutions to a single problem.  A chink in the 9003Q's armor?

JKB


-----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 2:13 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