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

[Glenn Little WB4UIV]

A down side on the R-1051 series is the filter selection is made with the 
mode. When CW mode is selected, the widest filter in the radio is selected. 
Don't know why, just this is the way it works. The front end has a tube in 
it for EMP protection. We used the R-1051 on submarines and it is 
definitely stable. Even more so when connected to an external Cesium standard.

The radio is definitely NOT a band cruiser.

The R-1051 is more stable that the R-390A
The R-390A requires thought in filter selection, the R-1051 selects filter 
with mode.
The R-390A is easier to tune.
The R-390A is easier to fix.

73
Glenn
WB4UIV



At 12:51 PM 07/25/04, Ed Zeranski wrote:

>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
>
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