by Josh Rovero, KK1D

Updated: December 17, 2016

The Hammarlund HQ-145 is a single (below 10 MHz) or dual conversion (10 to 30 MHz) general coverage receiver. It is equipped with both a Lamb crystal filter and an IF T-notch. The HQ-145X sports a single crystal socket for fixed frequency operation. The later HQ-145A replaces the tube rectifiers with solid state diodes, while the HQ-145AX had 11 switched crystal sockets in addition to the variable HFO. The intermediate frequencies are 455 KHz and 3035 KHz.

References:

1. "HQ-145X Communications Receiver, Technical Description and Operating Instructions", Hammarlund Manufacturing Company (A Giannini Scientific Company), April 1962.
2. "Communications Receivers, The Vacuum Tube Era 1932-1981", 3rd Edition, by Raymond S. Moore
3. "Shortwave Receivers Past & Present", 2nd Edition, by Fred Osterman
4. Contributors

Chassis, top      Chassis, bottom      Schematic (3300x2400 pixel GIF, 212K)

HQ-145 photo and data from www.dxing.com

IK1XPV's image of HQ-145 

HQ-145X

HQ-145X

Additional HQ-145 images from Google Image Search