Dec 1, 2012 · The R-390 was a very hard radio to maintain as well as expensive so that is why the 390A was developed. Ive worked on scores of both in the USN and later when they started showing up surplus in the late 60's and I had a moonlight job for Herb Gordon Company getting them up to specs.

Sep 1, 2017 · The general consensus was that it was a good altho overly complicated radio that had competition such as the 51J4, 50S1, R-390A to contend with, was not easily maintainable, and was obsolete by then. As with most equipment designed in the 50's it …

Nov 11, 2020 · The S-120 developed from the ~1946 S-38A and on to the end of Halli which milked the basic AA5 design for decades with just cosmetic changes. When sunspots were down so were the signals on Band 4. Even my beefed up HRO-60 and Collins R-390A suffer on the higher frequencies as does any of the super expensive SS gear. SX-140.

Jan 15, 2022 · I can no longer see the bio detail when I query a callsign. Somcetimes when searching the net, I come across a snippet of a QRZ bio and I go log in and...

Aug 5, 2003 · Receivers reported among the check-ins included examples from the Collins 75A series, and the Collins-designed R-390A military receiver. A wide geographic area was represented among the check-ins, from stations as far south as Virginia to as far west as Michigan, but predominantly among the northeastern states.