The discussion centers on the role of frequency synthesizer stages in receivers and transmitters, specifically highlighting the R-1051 model. The R-1051 features varying tuning resolutions of 500 Hz and 100 Hz, which refer to the discrete frequency steps of its digital receiver. The device utilizes a 5.0 MHz internal frequency standard reference and a phase-locked synthesizer with an error-canceling loop, enhancing its frequency stability. Additionally, the RF front end employs tubes for protection against nuclear EMP and high RF input levels.
PREREQUISITESRadio engineers, hobbyists in amateur radio, and anyone involved in the design or optimization of RF communication systems will benefit from this discussion.
The receiver joins quite exceptional performances to a marvelous modular execution, with the RF unit containing the several tuning turrets, the external one is motor driven. The exceptional frequency stability is based upon an internal 5.0 MHz frequency standard reference (An external standard may be selected) and a synthesizer, phase locked to the reference, also containing an error canceling loop. Various revisions built in the years, with increasing tuning resolution. Depending upon the revision, varies the quantity of semiconductors (Transistors and even ICs) used.