[GE] Mstr II PA

[n griggs]

Chris,

The MIII PA wants about 10 mW drive input where the MII is closer to 100 mW IIRC.  The MIII control cable (the gray cable) requires +12 volts for the driver circuitry, PA Key (+5 volts)also for the driver circuitry - this is summed inside the amp with the dc sample of the reflected power, power set - this is between 4 & 8 volts and is the 'software' power adjustment from the programming, ground and a power sense output - an analog voltage going back to the MIII chassis for monitoring the output power.  I have converted several high band MIII repeaters to the amateur band and, the repeater owner and I have toyed with doing the opposite of what you are wanting to do - using a MII amplifier on a MIII system but as a last resort.  I still have pieces to put together to have two complete systems (146.955 & 146.73) in case of an emergency.  The repeater builder website has the MIII LBI if you need it.  Let me know how it turns out!

73,

Neal KC4YCM


________________________________
From: Chris Boone <Cboone at earthlink.net>
To: LMR at yahoogroups.com; ge at mailman.qth.net; general_electric at yahoogroups.com
Sent: Saturday, September 17, 2011 9:04 PM
Subject: [GE] Mstr II PA

Have a UHF MII that the PA is slowly dying...was doing 135 full output (and
set it at 75)...now a few weeks later, it is only doing 55-60watts max...
Is on a combiner with 3 other channels (closest is 8MHz away from the MII!)
Other than the strap between the PA and LP filter, what other areas are
known failures or could cause this problem??

Is a MIII PA interchangeable???

Tnx

Chris

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