[Collins] 75a-2 off the wall problem

[Dr. Gerald N. Johnson]

First guess is that the rack isn't falling as fast as the cam and so it 
gets out of alignment going down in frequency, but the cam forces the 
rack when going up in frequency. Could be a lubrication problem or slugs 
sticking in coil forms. PTO amplitude vs frequency should be the same 
for either direction of travel.

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association.

On 4/23/2012 6:15 PM, mike nussman wrote:
> Hi all,
>
> After doing an rf alignment,I notice that while decreasing the tunning scale,sensitivity and mixer white noise goes way down.That is until the freqs are then re approached by increasing back up the scale,then seems to rapidly increase back to normal.
>
> Otherwise, the radio is very sensitive and dial linearity is a little bit out of spec on the end but not enough to prompt me to take the PTO out and service it.
>
> I will get back to it this weekend (hope) and need to verify that the PTO amplitude is not dropping off.
>
> Anyone ever experienced this with a Collins PTO receiver?
>
> TNX in advance
> Mike
> W U 4 V
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