Transceivers
Jim Fist WIDTY Tacfinicai Editor
Babcock B-500-SSB Transceiver
The new Babcock B-550-SSB is claimed to be the world s most advanced transceiver» utilizing techniques that significantly extend the state of the transceiver art. This completely self-contained unit uses the advantages of modular construction and provides high efficiency performance on SSB, CW and AM.
With the exception of the 12BY7A driver and 4CX250B final amplifier, all the circuits in the B-500-SSB use transistors or integrated circuits, A total of thirteen integrated circuits are used in conjunction with silicon transistors and diodes. The front end of the receiver uses two field effect transistors in cascode along with another FET in the first mixer. This combination results in a noise figure of 4 dl3, sensitivity of at least 0.5 /¿V on all bands and crosstalk rejection on the order of 96 dB.
The B-500-SSB covers all the ham bands from 80 through 10 meters in eight 500 kHz segments. Two precision VFOs are built in, and each provides calibration at the 100 Hz points. The receive VFO permits independent receiver for working out of band DX stations.
The power input on all bands is 600 watts PEP on sideband, 250 watts on CW and 500 watts PEP on AM with the optional B-500-AM plate modulator. For maximum efficiency and linearity, the final 4CX250B is run in class ABi on single sideband and in class C for AM and CW. The optional AM modulator is a plug-in unit which mounts conveniently inside the transceiver cabinet.
Other interesting features of the new Babcock B-500-SSB are the built-in supplies for both 115 Vac and 12.6 Vdc, a front end noise blanker which uses its own broadband if amplifier and noise gate, notch filte r with notch tuning and depth controls, a level control to eliminate external attenuators when using a linear amplifier, built-in SWR meter, and front panel selection of ALC< For more information on this brand new transceiver, write to L, E. Babcock and Company, 28 Durant Avenue, Maynard, Massachusetts 01754,
Collins
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