[Premium-Rx] NRD-93 Problem

[Terry O']

I had a similar flaky jumpiness on the tuned frequency in a 
WJ-8718/MPF.  It turned out to be an erratic latch on the address bus 
lines, in this case a 74LS373.  It took some digging with a logic 
analyzer to finger the culprit.

Terry O'


On 12/22/2020 11:17 AM, Arthur Delibert wrote:
> I think it happens on a few of the MHz positions, but I don't think it happens on all of them.  And they seem to be "paired up" -- that is, a particular position will always switch to another specific position.
>
> ________________________________
> From: premium-rx-bounces at mailman.qth.net <premium-rx-bounces at mailman.qth.net> on behalf of joseph.bozzer at skynet.be <joseph.bozzer at skynet.be>
> Sent: Tuesday, December 22, 2020 11:29 AM
> To: premium-rx at mailman.qth.net <premium-rx at mailman.qth.net>
> Subject: [Premium-Rx] NRD-93 Problem
>
> Hi Heinz
>
> 1) Does the problem always occur on the same position of the "MHZ" switch?
> 2) is the switch always to the same registered frequency?
>
> Joseph ON4OM
>