[R-390] Litton Model 1309 Microdial ?

[Steve Hobensack]

Dave,

Take a Bristol wrench and move your BFO knob out away from the chassis a small distance. You knob will then be able to move 360° and more. There is an interference tab and tang on the inside of the knob that stops rotation at 180° should the knob be mounted close to the chassis.

In teletype service some of the bfo knobs had the VeederRoot dial to aid in splitting out the teletype signal. It merely shows the bfo offset at a precision setting.

....Steve...N8YE

Message: 6
Date: Thu, 28 Feb 2008 22:00:39 -0500
From: K3DX 
Subject: [R-390] Litton Model 1309 Microdial ?
To: r-390 at mailman.qth.net
Message-ID: 
Content-Type: text/plain; charset=us-ascii; format=flowed

Greetings, All!

At my radio club meeting tonight, a friend handed me a turns-counting dial,
in the box. It looks an awful lot like the BFO dial on some R390(A)s.
But it has no reducer. Given that the dial shows 100 units per turn
(out of a total of 1,000) and that the R390A BFO knob only rotates through
180 degrees, how useful would this be? I would get 25 units on either side
of BFO center frequency. Is this what the 'real' counters do on the R390A?
And why do some R390A's have the BFO counter dial, while others do not?

73, Dave - K3DX Delaware's 'DX' Station

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