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DESCRIPTION AND MAINTENANCE MASTR ® II BASE …
https://www.repeater-builder.com/ge/lbi-library/lbi-31899e.pdf
The MASTR II radio station combinations are designed for either DC or Tone Remote Control or Repeater operation. The station receiver is mounted on a shielded enclosure on the radio panel front door, along with a receiver system board which accommodates Channel Guard and other op- …
GE Mastr II (Master 2) Radio Modifications
https://w4zt.com/repeater/gem2/
system board wiring, and control cable. The Mastr II radio has an audio OUTPUT from the receiver which is designed to be feed to an external PA amplifier (you've heard them on cop cars and on trains if you've been around them). This signal is fed from the receiver
MASTR II Power Amplifier Repair - Repeater Builder
http://www.repeater-builder.com/ge/mastr2/m2-parepair.html
GE MASTR II Power Amp Repair By Ray Vaughan KD4BBM Here are some pictures from inside the Power Amp before and after a recent PA repair. The symptoms were weak signal. It tested at about a 1/10th a watt. But the power supply voltage dipped from 15 to 13 volts when the PTT was applied. So the PA seemed to be drawing current.
NHRC MASTR II InfoSite
The General Electric MASTR II mobile radio (and it's variants: the MASTR Executive II and the Custom MVP) is very popular with amateur radio operators for it's ease in converting to duplex operation for repeater construction.
Mastr executive II PA | RadioReference.com Forums
https://forums.radioreference.com/threads/mastr-executive-ii-pa.387581/
As I remember, there is a RCA, or phono receptacle on the PA for the RF input. It only takes about 200 milliwatts to drive it to full output, so if you are driving it from most any kind of radio, you will have to insert an attenuator to keep from destroying the first amplifier transistor. These, and the venerable MASTR II W WX5812 Member Joined
NHRC MASTR II InfoSite -- Choosing a Radio to Convert
https://nhrc.net/mastr2/choosing.php
Handle Color and UHF MASTR IIs Beware of "silver handle" UHF MASTR IIs. These typically have a VHF exciter and a "tripler PA" in them. These radios are notorious for spurs and general noise on the RF output. The "painted handle" UHF radios are definitely preferred.
eHam.net
https://www.eham.net/reviews/view-product?id=7781
Well a substantial difference in audio quality and receiver performance were noticed almost immediately! When the old MASTR II was put back into service, several members commented on the poor audio and receiver. So, we decided to replace the MASTR II with the Exec II permanetly. We wired up the club's CAT-1000 controller and put it on the air.
Interfacing an SCom 7330 to a GE Mastr II Repeater
http://www.scomcontrollers.com/downloads/7330ToGEMastrII.pdf
maintaining maximum audio quality and squelch response. This paper describes interfacing the 7330 controller to the Mastr II repeater/station with the original motherboard and card cage (19D417214G1, G2) using the Mastr Controller jack on the backplane. It does not cover interfacing to the newer IDA shelf or the Mastr IIe shelf.
MASTR II to TNC 2 Connection Chart - Jon Trent Adams
https://www.jonadams.com/pages/amateur_radio/mastr2_tnc_connections.htm
The MASTR II 35W version has a recurrent problem (at least the dozen or so I have played with) with the transmitter power control hybrid. Generally, the hybrid appears to fail and the output power goes to zero because the hybrid shuts off the PA.
435 Repeater Equipment - Your435.com
https://your435.com/2018/01/01/435-repeater-equipment/
Within the bandwidth limits of our 2-Meter channel, this is the ideal setup for high-fidelity audio. The Mastr Exec II TX PA frame on the back is a bit crusty on the outside, but it’s now beautiful inside with the new power brick and precision variable resistor for fine-tuned RF power adjustment. The frame came from an Exec with 435 crystals.
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