Elecraft

Alignment and Test Part 2

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Dave Lowenstein

Alignment and Test Part 2

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
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Don Wilhelm-3

RE: 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
>

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Dave Lowenstein

Re: Alignment and Test Part 2

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" <[hidden email]>
To: "Cyberider" <[hidden email]>; <[hidden email]>
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
> >
>
>

Peter Zenker

German Manual for the T1 ATU ready

In reply to this post by Don Wilhelm-3

I hereby proudly anounce, that all German manuals for the T1 are ready. Of
course the errata is included in the German REV A manual :-)

This manuals are real manuals not only a piece of paper with a translation
to be used with the original manual. The layout is 1:1 page compatible to
the original. That´s sometimes not so easy because in German language the
text parts are up to 30% longer. It was a great help that the original
manual did not save paper by a compressed Layout :-)

73 de Peter, DL2FI
www.qrpproject.de

With stiff fingers now after some dozen hours of typing.

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Don Wilhelm-3

RE: Alignment and Test Part 2

In reply to this post by Dave Lowenstein

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" <[hidden email]>
> To: "Cyberider" <[hidden email]>; <[hidden email]>
> 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
> > >
> >
> >
>
>

Dave Lowenstein

Re: Alignment and Test Part 2

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" <[hidden email]>
To: "Cyberider" <[hidden email]>; <[hidden email]>
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" <[hidden email]>
> > To: "Cyberider" <[hidden email]>; <[hidden email]>
> > 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
> > > >
> > >
> > >
> >
> >
>
>