FS: MARTI RPT-25N Remote Pickup Transmitter with Dual Frequency Option

[Mark & Mary Ann Weiss]

FS: MARTI RPT-25N Remote Pickup Transmitter with Dual Frequency Option

 

 

 

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This MARTI RPT-25N has been repaired, tested, calibrated and checked for spectral purity. This unit's serial number is 1153. It is ready to go into service, just connect an antenna, microphone and ac power and you're on the air.
It has the extra-cost dual frequency option and can transmit on 450.2875MHz or 450.5875MHz at the flip of a front panel switch.
The waveform photos are, unmodulated carrier, carrier with 1KHz tone at 100% modulation, and demodulated audio, as performed by a spectrum analyzer.
The crystal frequencies have been trimmed to within 200Hz of their assigned frequencies with 2 hours of warm up time to fully stabilize.
Cosmetically, it is in fair condition, due to a crack in the meter's plastic face. The meter movement works fine however.
The CA-40-5 compression amplifier was repaired and the FET balance and VVR response times were aligned with pulsed and continuous sine tones.
Input channels: four. Input one is push to talk mic, 2 and 3 are basic XLR mics (150-500Ω) and input 4 is balanced 600Ω Line Level.
A full manual is included with this unit, including schematics.
The unit will be packed in double-wall corrugated carton with proper cushioning material for safe transit to buyer's destination and insured for full selling price.