Swan Model 510X Crystal Controlled Oscillator for the 350C, 500C, 500CX, and later transceiver models

This Swan Model 510X Crystal Controlled Oscillator, was made for the 350C, 500C, 500CX, and later transceiver models.

510X (Crystal Controlled Oscillator)
The 510X Crystal-Controlled Oscillator was marketed for use with the 350C, 500C, 500CX, and later transceiver models.

It is designed to provide stable frequency control for MARS (it was marketed as a “MARS” Oscillator) net or fixed channel applications, providing for 10 switch-selectable crystals with a frequency output of up to 22 MHz.

The 510X provides a front panel vernier control that can tune ±2 to ±3 kHz (sometimes as much as ±5 kHz) about the crystal-controlled frequency. Since this model does not contain a RF GAIN control, it is not directly useable with the model 400 series transceivers without modification.

Crystal frequencies are calculated in the same manner (using a 5.5-MHz IF)

 I am selling this unit as is, as described.