[R-390] [ R390] R1051B/UU for sale

[Ed Zeranski]

More or less the R-390A was the last fully tube based general coverage
HF receiver fielded by the US military. The R-1051 was more or less the
first mostly solid state radio fielded by at least one part of the US
military. Both radios saw use more or less side by side for a lot of years.

   * True in the mid-late '60s Navy anyway with the '51 set up on fixed freq
nets like Fleet Broadcast and the R390/390As set up in LOPs for individual
operators and freqs that would change.

The 1051 is a lot more stable than most radios from the era and for
that matter more stable than most of the radios made today

    * The Navy made the swing to SSB and tone diversity multiplexing for
broadcast in the mid-late '60s. The mux broadcast was decripted with KW-7s,
14s, or 37s then run through a UCC-1V to break out the channels. If the RX
drifted the result was garbled messages or dropped crypto. The 1051 was up
to the job.



EdZ