[BC] Moseley 6060 STL Transmitter notes.

[Ron Castro]

I've got several of those types of units, although fortunately, no 
failures...yet.  Were these recent units that had the problem?

Ron Castro
Chief Technical Officer
Results Radio, LLC


----- Original Message ----- 
From: "radioranger" <radioranger at comcast.net>
To: "'Broadcast Radio Mailing List'" <broadcast at radiolists.net>
Sent: Tuesday, May 31, 2005 6:12 AM
Subject: RE: [BC] Moseley 6060 STL Transmitter notes.


> You may have only "fixed" your problem temporarily.  Talk with Kevin Winn 
> at
> Moseley about the bad SMD capacitors that have been plaguing the PLL in
> Moseley PCL 6000 series equipment, both transmitters and receivers.
>
> Steve B.
>
>
> -----Original Message-----
> From: broadcast-bounces at radiolists.net
> [mailto:broadcast-bounces at radiolists.net] On Behalf Of jon
> Sent: Saturday, May 28, 2005 10:49 PM
> To: Broadcast Radio Mailing List
> Subject: [BC] Moseley 6060 STL Transmitter notes.
>
>
> As always, a piece of equipment decides to take a "holiday", during a
> holiday weekend. This time it was a Moseley 6060 STL transmitter.
>
> The usual thing happened: No AFC lock. And, of course, the old 505 backup
> would not lock either, when the OM tried it.
>
> So, I pile in there, and poke around the PCL 6060. (I spent a few minutes
> literally slapping the old 505 to get it going again. A few swift wacks,
> and some adjusting of the AFC pot got us back on the air...kind of. The
> 505 had somewhat low modulation, but I was focused on fixing the 6060. So,
> I cranked up the output of the Orban into the 505, and we had a signal
> of sorts).
>
> All supply voltages check out. Pop the cover, and the unlock light on the
> FMO module is on. Of course, the (stupid) foam mounts are rotted, so the
> FMO is just floating around the chassis. Fortunately, nothing was shorted.
>
> With much fooling around, a lot of it trying to find where the previous
> engineer hid the manual, I got to work. The reference osc had no output.
>
> Manual found, and after quite a bit more time debugging the reference
> oscillator, found out the 3.2 MHz crystal socket had "cold" solder joints.
> Fixed that, and all was well.
>
> Good thing I am comfortable working with the 145152P2 PLL chip (Don't
> ask, but it had something to do with the phase locked transmitter I
> designed and built for a pirate station when 145151s were still brand new.
> :-) Statute of limitations are up, so that ok to say. Hehehhe).
>
> So, moral of this story is check TP1 on the PLL circuit (which on the 
> board
> is a different TP1 that is referenced in the tuning/troubleshooting 
> section
> on the incorrect and annoying manual). If you get nothing, pull the "oven"
> off of the xtal and give it a wiggle.
>
> It might save the day, or at least some time.
>
> Hope this all help someone in the future!
>
>
> Jon
>
>
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