[Premium-Rx] MacKay MSR-5050A

[Mark Donaldson]

Looking for info from MacKay MSR-5050A RX owners. I am getting one of these sorted out and notice the tuning dial is acting unusual. The tuning is not nice and linear as you spin the knob in the way it changes the frequency setting. It appears to be speed related, the faster you turn the knob the quicker it changes the frequency. I have seen this same type of speed based tuning in test equipment but the way it works on my MSR-5050A is slow and klunky so not sure it is acting normally or not. I have scoped the outputs of the optical encoder and the subsequent logic and all appears normal.
Thanks for any input from anyone who owns or has used one of these receivers.
Mark WA1QHQ