[R-390] MICRODIALS FOR R-390A/URR

Sun, 5 May 2002 15:37:38 -0700

I expect these were a "turns counting dial" as used with potentiometers for
many, many years.

Some models are still in production.  These are sold(but not necessarily
manufactured) by multi-turn potentiometer vendors such as Vishay/Spectorl,
Bourns and B I Technologies (formerly Beckman Instruments).

Bourns offers an embedded counter style such as you describe:

	http://www.bourns.com/html/dials.html

An alternative (counter is above the knob) is the Model 15 from
Vishay/Spectrol which can be found here:

http://www.vishay.com/brands/spectrol/pots.html#multi_dial

- greg

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of [email protected]
Sent: Sunday, May 05, 2002 1:58 PM
To: [email protected]
Subject: [R-390] MICRODIALS FOR R-390A/URR

Dear Friends,
             I'm searching informations and if is it possible photos about
MICRODIALS, a sord of knobs with an digital mechanical counter inside, that
I heard were applied instead of BFO knob on R-390A/URR emploied by NSA.
 I founded a box with five of this knobs.

 Any helps very appreciated. Federico BALDI