[Collins] R-390A frequency measurement - in service

[pete wokoun]

A few turns of insulated wire on the outside of the PTO oscillator tube (inside the tube shield) is usually enough to couple the pto signal  to a sensitive counter.  You might want to use teflon wire as some insulations may melt.
 
> Date: Sun, 22 Nov 2009 17:11:54 -0500
> From: jbrannig at optonline.net
> To: frankshughes at aim.com; collins at mailman.qth.net
> Subject: Re: [Collins] R-390A frequency measurement - in service
> 
> Frank,
> If you only count the PTO then you will have to guesstimate
> the heterodyne oscillator frequencies
> To use a counter directly requires mixing all the oscillators and reading 
> the resultant output.
> 
> A few pf of capacitance should couple enough RF to count the PTO output.
> 
> 
> Jim
> > Hi,
> > I am searching for a way to connect my HP 5316A frequency counter to the 
> > R-390A so I can get an accurate
> > measurement of what frequency it is tuned to while in operation.
> >
> > I searched around and it looks like I need to connect to the PTO output.
> > If this is the best way, what should I use to make the connection w/o 
> > effecting the circuit operation?
> >
> > 73, Frank
> > KJ4OLL
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