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MCI (Micro Controls) STL Tx

S

Studio1

I've just inherited an STL Tx unit made by this company that used to operate out of Burleson, TX.

Apparently it's a fairly old unit but is crystal controlled so should be able to function within spec.

Has anyone got any information on it? Service manual or such?

The FCC ID # is ESEPTS-10C

I've run a check on it, and about the only useful information it gives is the name Jeff Freeman. The name seems familiar.
He might even be on this forum!

Any info that can be provided would be most appreciated.
 
Back in The Day, the Katz flagship WEZN in Bridgeport, CT had one or two of those. They're Cox now, but I believe Dom Bordunaro is still Chief. He might have the book on one. If memory serves, about the only problem they ever showed was frequency instability when one or two of the chip caps in the RF chain drifted a bit. When they worked, they had excellent specs.
 
You will find that you will need a fan on the heat sink to keep them operating at full power. These are early '90's era devices, they were made by a company in Texas by somebody who split off from Marti. That company has long since vanished.
 
I put one of these in at my old college station many years ago. It wasn't my best purchase but it was used for well over a decade. It uses a hybrid RF module used in 2-way radios at 425 mHz and then has a frequency doubler stage after it.

As mentioned above, keep the power down or add a fan.

Contact David Caban Technical Director at WRUW-FM and he probably has the manual and might even be willing to sell you the units for spare parts. The email address is: techcrew( at) wruw (dot ) org.

Best of luck

Rolf Taylor
 
It's likely that the transmitters are not FCC Type Accepted and/or Type Notified and therefore can only be used for auxiliary use.
 
Had one at WXCI, great sounding STL! (the receiver may still be in use)
Shotgun the caps, get some deoxit on those push button switches and it should run fine.

Good luck finding the manual

Pete
 
I have one. PM me with your email and I'll scan it into a PDF and email. May take a week or so. It's at a tx site, so I'll have to go out there and grab it.
 
I had a redundant system using those at Yes! 95 in Cincinnati in 1980-81. We never had a problem with the transmitters, but the receivers did NOT like cold. I got a call one fridgid night that we were off the air. Upon arrival at the tx site I found both receivers inoperable. Once I opened up the diversion vane in the exhaust duct and got the building warmed up, both came back on line like nothing had happened. Only STL's I ever had that happen with. They really were utterly transparent to the audio...
 
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