[Elecraft] Alignment and Test Part 2

[Cyberider]

Thanks, Don.  Your diagnosis was correct.  Voltages are now right and the
receiver hears for the first time.  Thanks for being there with all of your
Elecraft knowledge!

73,
Dave
N7AF

----- Original Message ----- 
From: "W3FPR - Don Wilhelm" <w3fpr at earthlink.net>
To: "Cyberider" <cyberider at gmail.com>; <Elecraft at mailman.qth.net>
Sent: Saturday, April 02, 2005 11:51 AM
Subject: RE: [Elecraft] Alignment and Test Part 2


> Dave,
>
> You did anticipate my next question, and now I believe I can say that Q3
has
> been somehow zapped since it appears to be conduction with a very low
> voltage on the gate.  Replace it with the 2N7000 that remains unmounted in
> your K2 parts and request a replacement from Elecraft so you can fill the
> holes at Q10 on the RF board later.  I beileve that will fix your problem.
>
> 73,
> Don W3FPR
>
> > -----Original Message-----
> >
> > Thanks for the reply, Don.
> >
> > D6 and D7 are oriented properly.
> >
> > I am measuring 7.94 volts on the collector of Q1 and 7.15 volts on the
> > collector of Q2.
> >
> > Anticipating your next question, on Q3 I am measuring:  S=0
> > G=47mV D=51 mV.
> > D should be 8 volts according to the manual.
> >
> > Tnx & 73,
> > Dave
> > N7AF
> >
> > ----- Original Message -----
> > From: "W3FPR - Don Wilhelm" <w3fpr at earthlink.net>
> > To: "Cyberider" <cyberider at gmail.com>; <Elecraft at mailman.qth.net>
> > Sent: Saturday, April 02, 2005 10:49 AM
> > Subject: RE: [Elecraft] Alignment and Test Part 2
> >
> >
> > > Dave,
> > >
> > > It would appear from those readings that either you have D6 or D7
> > installed
> > > backwards or that both the 8R and 8T voltage lines are active, and
they
> > > should be mutually exclusive.
> > >
> > > First check the diode orientation against the Parts Placement Diagram
in
> > the
> > > rear of your manual, and if these are correct, measure the sources of
8R
> > and
> > > 8T at the collectors of Q1 (8T) and Q2 (8R) on the Control
> > Board.  If both
> > > are near 8 volts at the same time, you have a problem with the
> > controlling
> > > circuit in the base of Q1.
> > >
> > > Let us know what you find and we can proceed from there.
> > >
> > > 73,
> > > Don W3FPR
> > >
> > > > -----Original Message-----
> > > >
> > > > I am not getting any significant signal input from the antenna
> > > > and the loss seems to be at D6.  In trying to determine whether
> > > > D6 is at fault, I'm measuring 7.13 volts on the anode and 7.31
> > > > volts on the cathode.  The manual indicates they should be 8.0
> > > > and 7.5 volts respectively.  On D7, I'm measuring 7.94 volts on
> > > > the anode and 7.31 volts on the cathode.  The manual indicates
> > > > 0.0 (error?) and 7.5 volts respectively.  Before I blame D6 for
> > > > the loss of signal, is there something else going on here that
> > > > may be causing the problem?
> > > >
> > > > Thanks,
> > > > Dave
> > > > N7AF
> > > >
> > >
> > >
> >
> >
>
>