first ad for the AGS appeared in QST in October
AGS has been developed in conjunction with the Airways Division of the
U.S. Department of Commerce to comply with the exceeding strict
requirements of aviation ground-station service." In
the AGS name was derived from "Aviation Ground-Service."
Several major design features addressed short comings of exsisting receivers, e.g. the Hammarlund Comet "Pro":
layout and extensive shielding are evident. Coils plug into
cylindrical shields at the top. The tuning asembly, below,
contains three separate variable capacitors interconnected by a
rack-and-pinion drive behind the front panel. The upper
shows the original short IF cans. The lower image shows the
taller air-tuned IF's.
AGS with coil rack and power supply.
Pricing from the manual:
AGS, with coils covering 1.5 - 20 MHz, less tubes. $165.00
RFS, PM speaker in rack panel 17.50
CPR, coil rack 8.50
GRDPU, rack-mount supply for two receivers 55.00
5886, table-top power supply 21.00
Bandspread coils for the ham band were introduced in February 1933 QST. These used the same technique applied to bandspread coils for the SW-5 and SW-3. The main tuning capacitor is tapped down on the coil, and each coil carries a trimmer to act as band set.
Air-tuned IF transformers were made available in April 1933 to improve stability.
also saw the introduction of the crystal-filtered AGS-X.
with band-spread coils, this would have been a nearly ideal ham
receiver, but it was too expensive for all but the most well-heeled
depression-era amateur. Fortunately, the boys at National
this, and had a solution, the legendary FB-7.