Note
QST, Jun 1958, p. 115.
CQ, Jun 1958, p. 17.
QST, Nov 1962, p. 101. (HQ-170A)
QST, Jun 1964, p. 5. (HQ-170VHF)
QST, May 1965, p. 129. (HQ-170A-VHF)
QST, Feb 1966, p. 116. (HQ-170A-VHF)
QST, Oct 1967, p. 139. (HQ-170A-VHF)
QST, Jan 1968, p. 125.
HQ-170 1958 - 1962
HQ-170A 1962 - 1967 (VHF model sold concurrently)
The HQ170(A) is a triple conversion receiver made specifically for amateur band use. It features an optional clock which can be set to turn on the receiver 30 minutes before it was needed in order to let the frequency stabilize.
At first glance, the HQ-170 appears to follow the long-time Hammarlund practice of using two tuning knobs and windows, with the main tuning knob on the left and band spread on the right. Closer inspection reveals it was a ham-band-only receiver covering 160–6 meters. The left-hand window was calibrated for 160, 80, 40, and 20 meters; the right one for 15, 10, and 6 meters. The left knob was the tuning knob, turning the scales in both windows; the other knob was a vernier adjustment that tuned +/–3 kHz. The 17-tube, triple-conversion set had L/C filtering and an adjustable notch in its 60 kHz IF.
With the HQ-170A, Hammarlund improved the electrical and mechanical stability and added a calibration scale for a 2 meter converter. Silicon diodes replaced the tube rectifier.Its flip-top cabinet gave easier access to the receiver’s interior. The window on the upper left panel was for an optional clock.
The main tuning condenser appears to be an off-the -shelf component modified by Hammarlund by the removal of a rotor in each of the three sections. Flywheel tuning for smooth adjustment.
Coverage (MHz):
1.8-20
3.5-40
7-7.30
14-14.40
21-21.60
28-30
50-54 MHz.
Requires external 3.2 Ω speaker.
References
Review (HQ-170). CQ, Nov 1958, p. 76.
Brief description. Electronics World, Sep 1964, p. 97. (HQ-170-VHF)
