[Elecraft] Alignment of VCO - Problem

[David C Dawson]

I don't know. Must be asleep at the switch.
Here's what's what so far this end.
The probe verifies -- it did read correctly in step 3 on page 46.
The leads are correct.

I have replaced the suspect diode but the probe will not read anything
at TP1.

I have constructed the RF Probe and connected it to my DMM.
It reads voltages at certain points, but sees nothing at TP1.

On Mon, Nov 13, 2006 at 08:21:51PM -0500, Don Wilhelm wrote:
> David,
> 
> First thing is to verify the probe.  Did the probe test give a correct
> reading of 4 MHz when it was checked in the 3rd step on page 46 of the
> manual?  Note that this only checks the operation of the probe and has
> nothing to do with proper setting of the 4 MHz reference oscillator.
> 
> If your probe did NOT read the 4 MHz oscillator, look for the problem with
> your probe - is it connected properly, the shield should be closest to the
> left side panel when plugged in.
> 
> If your probe DID do the 4 MHz test OK, then let us know and we may be able
> to help find the reason your VCO is not functioning properly.  Tell us what
> test equipment you have available, and if you do not have an oscilloscope or
> other means of reading RF Voltages, please build the RF Probe - parts are
> provided with the K2 kit, see appendix E of the manual for the schematic.
> 
> 73,
> Don W3FPR
> 
> > -----Original Message-----
> > Hi,
> > I am at the stage in building my K2 on page 60 in the VCO test.
> > Up to this stage all was well.
> > Now, with the probe _definitely_ connected to TP1. I get a reading of
> > all zeros.
> >
> > Does anybody know the trouble-shooting procedure?
> > Thanks.
> >
> > (I didn't do the calibration of C22, due to not having a frequency
> > counter, but the reading was withing range)
> > --
> > David Dawson
> >
> 

-- 
David Dawson

The greatest dangers to liberty lurk in insidious encroachment by men
of zeal, well-meaning but without understanding.
                -- Justice Louis D. Brandeis