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GE Mastr II (Master 2) Radio Modifications
https://w4zt.com/repeater/gem2/#:~:text=The%20problem%20encountered%20by%20everyone%20building%20a%20repeater,is%20causing%20another%20problem%20that%20may%20manifest%20itself
GE MASTR II Self-Quieting Problems
https://www.repeater-builder.com/ge/mastr2/m2-loproblem.html
Problem defined: When low-side injection is used on a GE MASTR II radio, the receiver has a sensitive spot at the same frequency as the 18th harmonic of the transmitter crystal. The Solution: When ordering receive crystals for your UHF MASTR II project, order them for high-side injection. High-side injection also has a secondary benefit when ...
GE Mastr II (Master 2) Radio Modifications
https://w4zt.com/repeater/gem2/
The problem encountered by everyone building a repeater out of a Mastr II is one of the audio sounding "tinny" (too much treble, not enough bass). Even if you are willing to listen to the audio this way it is causing another problem that may manifest itself through control problems.
MASTR II local oscillator injection
https://www.repeater-builder.com/ge/mastr2/m2-lo-injection.html
GE MASTR II receiver sensitivity as a result of local oscillator injection Problem and Fix By Kevin Custer W3KKC. The GE MASTR II high-band and UHF receivers are highly sensitive and selective single conversion receivers.
GE Mastr-II - QSL.net
https://www.qsl.net/nm7r/mastr2.htm
T he Mastr-II receiver is crystal controlled and incorporates a 5-stage helical resonator front-end, in a large tin-plated block (that also houses the mixer), providing superior selectivity. The tin plating on this component has a habit of growing "tin-whiskers" that can cause problems. It takes moisture and time for these to grow, but in our ...
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.
NHRC MASTR II InfoSite
NHRC MASTR II InfoSite. 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. In addition to that, the radio is easy to service, and is widely ...
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