Search found 2 matches

by Rick700
Fri Apr 27, 2012 9:26 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Effratom Powersupply repair
Replies: 16
Views: 4358

Re: Effratom Powersupply repair

I just fixed two of these MPS-AC supplies. No thanks to Symmetricom who considers the schematic proprietary even though they didn't invent the thing.

There are two 220uF electrolytics on the board.
#1 C14, near the 8-pin dip next to the backplane connector had leaked on both my units. You may want ...
by Rick700
Fri Aug 12, 2011 7:19 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: SyntorXX lowband
Replies: 6
Views: 1533

Re: SyntorXX lowband

Several posts refer to solving low band sensitivity problems. Recently I have seen several
radios exhibiting sensitivities down by 6 to 10 dB. In evry case the problem was traced to
CR102 and CR103 in the pre-amplifier module. The incoming RF is switched by several
PIN diodes in the power amplifier ...

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