[Drake] TR-4 voltage question

[ltaft at charter.net]

Richard,

There is also another note that the readings with two values are for receive above and transmit below.  Hence my comment about the key.  I think the X-CW position is used to exercise the K2 relay and the side tone generator.

I have found that fixing the S meter circuit involves using a batch of new tubes in the bridge and sometimes changing a resistor.  Usually tubes fixes it.  If it is really out to lunch check the resistors around the meter and the meter resistance too to make sure there is nothing open.  It can be brought back to life.  

I haven't found the voltage tables to be very useful except as a general checkup on the power supply.  Maybe an open IF can will show up with the voltage readings.

73, Larry  K2LT
drakerepair.com
> 
> From: "Richard Peterson" <wb5nen at hotmail.com>
> Date: 2005/12/09 Fri PM 06:52:42 WET
> To: ltaft at charter.net
> CC: 
> Subject: Re: [Drake] TR-4 voltage question
> 
> Thanks for the suggestion.
> 
> I was really hoping to find mention of having a key plugged in, but I could 
> not find any mention of it. Darn.
> 
> It really does appear Drake wants me to measure the receiver voltages while 
> the rig is in transmit mode. Again, like I said below, this makes no sense 
> to me at all. And since there is no warning about not leaving it keyed too 
> long, I really can't believe that is what they want me to do.
> 
> So I am in a holding pattern until someone can help me out. I have to be 
> missing something here.
> 
> My goal is to troubleshoot this pesky bridge on the s-meter/transmitter ALC 
> circuit. That's why I want to start getting voltage readings.
> 
> Thanks.
> 
> Richard
> 
> 
> >From: <ltaft at charter.net>
> >To: "Richard Peterson" <wb5nen at hotmail.com>
> >CC: <drake at mailman.qth.net>
> >Subject: Re: [Drake] TR-4 voltage question
> >Date: Fri, 9 Dec 2005 4:54:11 +0000
> >
> >I thing they had the rig set up to operate with a key plugged in so you're 
> >still in receive.
> >
> >73, Larry  K2LT
> >drakerepair.com
> >
> > >
> > > From: "Richard Peterson" <wb5nen at hotmail.com>
> > > Date: 2005/12/09 Fri AM 03:56:51 WET
> > > To: drake at mailman.qth.net
> > > Subject: [Drake] TR-4 voltage question
> > >
> > > I'm trouble shooting my first Drake TR-4. I am puzzled with the 
> >following
> > > statement from the manual footnotes on the voltage chart page:
> > >
> > > "Receive measurements were made with the FUNCTION switch in the X-CW
> > > position."
> > >
> > > Boy, that seems goofy. In other words, I am supposed to take the 
> >receiver
> > > measurements when the rig is in transmit mode? What am I missing here? 
> >To
> > > the uninitiated (me), it would appear the Drake engineers had a serious
> > > drinking problem.
> > >
> > > Thanks.
> > >
> > > Richard
> > > WB5NEN
> > >
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