[R-390] BFO alignment

[Jim Whartenby]

Absolute BFO accuracy is not a requirement in MIL-R-13947B so evidently the Signal Corps did not think that it was necessary.  Paragraph 3.13.36 calls for a beat note frequency of 2.4 to 3.6 kc when the BFO knob is at 3.  The R-390 was designed for CW not SSB so being able to tailor the CW note was helpful for the operator.

Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy 

    On Monday, October 14, 2024 at 04:57:24 AM CDT, Larry Haney <larry41gm2 at gmail.com> wrote:   

 Hi Gianni, There is no way that I know of to make it closer to the panel
markings.

Regards, Larry

On Mon, Oct 14, 2024 at 1:44 AM Ing. Giovanni Becattini via R-390 <
r-390 at mailman.qth.net> wrote:

> Hi,
>
> is there any command to make that the BFO knob tells the true KC? Mine is
> not linear. If at 1 kHz it is rather aligned. For 2 kHz you must set the
> knob to almost 2.4.
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