[Premium-Rx] MM 3031A tuning question.

[refmon]

Hi,

I've had similar issues on various equipments over time.  While you're in 
there, make sure all is clean--wheel & pickup.  Also, be sure all is 
properly aligned mechanically.  Either can develop marginal conditions, 
behavior of which varies widely.

Also follow any and all advice offered here-can't go wrong with this group.

good luck!

John Collins
____________________________
----- Original Message ----- 
From: "w3jn" <w3jn at direcway.com>
To: "Craig Roberts" <crgrbrts at verizon.net>; <premium-rx at ml.skirrow.org>
Sent: Saturday, April 16, 2005 11:30 AM
Subject: Re: [Premium-Rx] MM 3031A tuning question.


>I had the same problem in a Collins 851S-1.  I replaced the driver 
>transistor inside the opto encoder and all was well.  Your mileage may 
>vary.... I'd look at the quadrature waveforms at the opto encoder output 
>and make sure they switch phase correctly with direction.  They probably go 
>to a 7486 XOR gate which determines direction... make sure all pulses are 
>nice 'n' square!
>
> 73, John
>
>
> ----- Original Message ----- 
> From: "Craig Roberts" <crgrbrts at verizon.net>
> To: <premium-rx at ml.skirrow.org>
> Sent: Saturday, April 16, 2005 1:24 PM
> Subject: [Premium-Rx] MM 3031A tuning question.
>
>
>> Good afternoon all,
>>
>> I'm enjoying my "new" Mackay Marine 3031A and plan to spend tomorrow 
>> cleaning up connectors, etc. and beginning work on my companion Class E 
>> AM transmitter.
>>
>> My receiver is exhibiting one anomaly, however.  The opti-coupler gets 
>> "confused". If I tune very slowly at any tunng rate setting, all is well. 
>> But, if I rotate the tuning knob a little more quickly, the frequency 
>> will move up, then down (or vice versa) at random. Is this normal? Must 
>> tuning be done slowly?  I'm guessing there's a limit to how quickly the 
>> photo sensors can interpret the movement of the chopper wheel..
>>
>>
>> Thanks very much & 73,
>>
>> Craig
>> W3CRR
>>
>>
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>
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