At 12:46 PM 1/29/2009, Ron D'Eau Claire wrote:
Wow, Pete, what a puzzle!
You might make up a little probe consisting of a wire connected to your rx
antenna input that you can touch to the circuit parts. If it has to be a
long lead, use a bit of coax so random signal pickup won't confuse things.
Pete,
Have you measured the emitter resistor (R2)? I would suspect that more
than the crystal.
Since you do suspect the crystal, do you have any other crystal that you
can substitute for it - it can be any fundamental crystal somewhere
between 3.5 MHz and 15 MHz as long as you have a receiver
Regrettably (hi), the emitter resistor is fine - very close to
nominal. wish I had a crystal to substitute, but I don't, so maybe I need
to get one from Elecraft - or just hang up the whole thing and get an XG-2.
Thanks for thinking about this, Don. I hope people don't mind my
continuing
If you havn't checked it out already, check out the BNC connector.
Mine had a problem internally and will cause problems.
73,
Tony W7GO
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Hi Pete,
You are working much too hard. I designed the XG1 for Elecraft and if
you send it to me, I'll repair it for you.
73,
Bob, N6CM
On Fri, Jan 30, 2009 at 6:34 AM, Pete Smith pete.n...@gmail.com wrote:
Regrettably (hi), the emitter resistor is fine - very close to
nominal. wish I had a
I had a similar problem with my XG-2 right after assembly, on one of its
three frequencies. Measuring voltages etc. did not give a clue, so I
finally took a crystal from my junk box and connected its terminals in
parallel with the crystal on the board (simply making the Xtal leads touch
the
Thanks Don. Unfortunately, all those variables test OK. I've gotta fix my
old scope!
I think that voltage must be an indication that the transistor oscillator
is at least drawing the right amount of current through R9. I'm going back
to recheck all my work on the default output attenuator.
No, sorry - I meant that in the 50uv position it generated an S9
reading. In the 1 UV position it was easily audible, but no S meter
deflection at all.
73, Pete
At 01:41 PM 1/28/2009, John wrote:
At 10:53 AM 28/01/09, you wrote:
and barely audible in the 1 uV position, but doesn't move an
: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Pete Smith
Sent: Thursday, January 29, 2009 3:15 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Need Help with XG1
Thanks Don. Unfortunately, all those variables test OK. I've gotta fix my
old scope!
I
I have an XG-1 Receiver Test Oscillator which I must have accidentally
zapped with RF somehow (I don't know when) because the output resistors
R6-8 were fried. I replaced them, as well as R4 and R5, C4 and the
transistor. The slide switch in the output tests ok.
When I turn the XG-1 on, I
Subject: [Elecraft] Need Help with XG1
To: elecraft@mailman.qth.net
Date: Wednesday, January 28, 2009, 11:19 AM
I have an XG-1 Receiver Test Oscillator which I must have
accidentally
zapped with RF somehow (I don't know when) because the
output resistors
R6-8 were fried. I replaced them
I don't have mine in front of me, but it is the SMA device that is on
there that you need to replace. It gets blown out. I'll grab the
docs real quick and follow-up.
Dave Wilburn
NM4M
Pete Smith wrote:
I have an XG-1 Receiver Test Oscillator which I must have accidentally
zapped with RF
Have you checked for any damage to the circuit board traces? If
enough power was applied to fry those resistors despite D1 D2
being in the circuit, maybe some of the traces were damaged as well.
I would think it would be visually obvious, but maybe not.
73
--
Joe KB8AP
On Jan 28, 2009,
It appears I was thinking of another device. I would first suspect Q1.
Dave Wilburn
NM4M
David Wilburn wrote:
I don't have mine in front of me, but it is the SMA device that is on
there that you need to replace. It gets blown out. I'll grab the
docs real quick and follow-up.
Dave
At 10:53 AM 28/01/09, you wrote:
and barely audible in the 1 uV position, but doesn't move an S-meter that
was formerly tested with it and registered S9.
Do you mean you used to get S9 with a 1uV signal? I would think the
1uV signal would be close to the noise level.
John
k7up
, January 28, 2009 9:54 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Need Help with XG1
Thanks for the idea - I removed both D1 and D2 from the circuit - no
improvement. The signal is quite audible (in the 50 uv switch position,
and barely audible in the 1 uV position, but doesn't move
Pete,
Do you have the proper voltage on Q1? Check for 1.22 volts at the
cathode of U2. Also check the value of R3 and R3 with your ohmmeter.
It sounds like you have replaced everything important, but if you had
enough RF to fry the resistors, you may have damaged the switch contacts
at the
I have an XG-1 Receiver Test Oscillator which I must have accidentally
zapped with RF somehow (I don't know when) because the output resistors
R6-8 were fried. I replaced them, as well as R4 and R5, C4 and the
transistor. The slide switch in the output tests ok.
When I turn the XG-1 on, I
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