[Tech-Assist] Moseley SL9003Q

[Alan Alsobrook]

Martin Acuff wrote:
> At 18:18 7/1/2011, you wrote:
>> Problem in transmitter unit: Alarm: Tx LO <50%

I haven't dealt with that particular unit yet, but typically speaking, 
when it shows a low LO (Local Oscillator?) alarm this could cause the 
AFC to unlock causing the transmitter to mute.

Of course this begs the question as to whether this is an active alarm 
or just something in the history.

The Demod unlocks, can be anything from the transmitter to the receiver 
including the PATH.  You need to verify all normal readings and monitor 
the times that this happens look for any patterns. What is your received 
signal. Where is this unit? There has been quite a bit of ducting and 
other atmospheric stuff going on lately here in Florida, but I don't 
know about your location.

The main indicator is the receive level, are you getting the BER hits 
with a high signal or a low signal?

There are so many things that can cause STL troubles it's hard to cover 
them all without writing a book. Sometimes it's best if you aren't 
experienced in this area, to have another set of "STL" eyes come look at 
things.

-- 
Alan Alsobrook CSRE AMD CBNT
St. Augustine Fl. 32086 904-829-8885
aalso at Bellsouth.net