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MSF5000 PA Molex Connectors
By Robert W. Meister WA1MIK
Here's a short table that documents the wire colors that are shown in several manuals. Of course, Motorola could change the wire colors at any time for any reason.
|Band and Type||Watts||H/S Temp||Circ Temp||PA Key||Fwd V||Gnd||Rfl V|
|I/C Board Driver||ALL||RED||N/C||WHT||GRN||BLK||N/C|
|I/C Board Final||ALL||RED||BRN||ORG||GRN||BLK||WHT|
The 125w and 350w VHF PAs utilize 28VDC. There was NO documentation in the manuals I had for the Molex connectors coming from those PAs. All other PAs operate from 14VDC.
In stations with a Driver PA as well as a Final PA, such as 150w 800/900 MHz or 350w VHF, there are two Molex connector cables coming from the Interconnect Board under the RF Tray. The connector with only four wires utilized goes to the Driver PA, since there's no circulator in the Driver PA and they don't measure the Reflected Voltage on the Driver PA. The cable with all six wires in it goes to the Final PA. If there's only one PA, it connects to the Final PA cable.
The connector coming from the PA is smaller than the one coming from the RF Tray. The smaller one has female contact pins and it fits inside the larger one. The photos below were taken from a cable that came from a 75w UHF PA. The wire colors at each Molex connector are identical.
|Pin Numbers||Looking into PA end||Wires coming from PA|
The author can be contacted at: his-callsign [ at ] comcast [ dot ] net.
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This page was created July 20 2014.
This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.