[Elecraft] Alignment and Test Part 2

[Cyberider]

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
> >
>
>