[R-390] Calibrator tone every 90 Khz

Roy Morgan roy.morgan at nist.gov
Thu Jul 8 13:29:08 EDT 2004


At 04:22 AM 7/8/2004 +0000, hdalexander at att.net wrote:
>Hi All
>
>I have a Motorola R-390(non-A). The calibrator makes a tone approximately 
>every 90 Khz., not every 100 Khz.. For example: 14000, 14090, 14180,14270, 
>14360. Do any of you have any words of wisdom for me? Thank you in advance 
>for any help.

Harold,

The crystal can't be off enough to create this situation. The 1 mc crystal 
drives a 100 kc multivibrator oscillator to synchronize it to the crystal. 
The multivibrator circit is not being synchronized and needs to be 
adjusted, or have some components replaced.

Roy


- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
roy.morgan at nist.gov --



More information about the R-390 mailing list