I can't see anything wrong with L6 or the circuitry around CA and C26. I'll
lift one end of L6 tomorrow- but now I'm starting to wonder if Q7 might be
shorted.
Bruce
N7CEE
--
If you can see the 1 ohm or so difference that represents the resistance of
L6 when measuring
I got so. dismayed... .with this problem with my 30m module I just
finally decided to remove it and see if the KX1 would work again, I did
and it did. Then I replaced the pieces of wire for the 30m module and
started again, really from scratch, installed it again, and the 2nd
time worked
Bruce,
Check the end of L6 closest to the wire you added at trimmer cap CC - L6
should not connect to the trimmer pad, but it is close, so a slight solder
splash will cause a short there.
73,
Don W3FPR
-Original Message-
L6 is good, it measures 1 ohm. But I'm seeing only 1 to 4 ohms
Bruce,
Check the end of L6 closest to the wire you added at trimmer cap CC - L6
should not connect to the trimmer pad, but it is close, so a slight solder
splash will cause a short there.
73,
Don W3FPR
Good idea. As compelling is it may seem at times, something else
On Friday 21 April 2006 04:47 am, Don Wilhelm wrote:
Bruce,
Check the end of L6 closest to the wire you added at trimmer cap CC - L6
should not connect to the trimmer pad, but it is close, so a slight solder
splash will cause a short there.
73,
Don W3FPR
No short there- thanks, Don. It
If you can see the 1 ohm or so difference that represents the resistance of
L6 when measuring from each end of it to ground, you can tell which side the
short is on without lifting one lead: it'll be on the end with the lower
resistance to ground. That will tell you
Looks like it's Q7. I pulled T2-2 and still had the short. So I pulled Q7.
The
short went away at L6 and the RX works. Q7 is shorted- only 3 ohms collector
to emitter. I don't think it's not a random failure. The original problem
with the KXB3080 was a hot Q6 but very low output power. That
I thought I found _all_ the problems with my KX3080, but I guess not. THe
receiver is now very insensitive on all bands. It works, but I don't hear an
increase in noise on any band when I connect an antenna. Tracing from the
antenna jack toward the mixer, I get a good increase in noise when I
On Thursday 20 April 2006 06:05 pm, you wrote:
Do you have the jumper installed in the jack next to the BNC?
Yes, the jumper is in place. That's not where I looe the RX signal. It's at
L6.
Also, the TX puts out normal power into a dummy load, so it looks like the low
pass filter part pf the
Bruce, N7CEE wrote:
I thought I found _all_ the problems with my KX3080, but I guess not. THe
receiver is now very insensitive on all bands. It works, but I don't hear an
increase in noise on any band when I connect an antenna. Tracing from the
antenna jack toward the mixer, I get a good
--
No. You have it right. Those marks on the KX1 PCB are correct for the KXB30
and incorrect for the KXB3080.
I suspect L6 is open. Have you ohmmed it?
You moved L6 to the underside of the KX1 PCB as part of the KXB3080 install.
Is it in the right holes on the bottom?
L6 is good, it measures 1 ohm. But I'm seeing only 1 to 4 ohms from min to
max
RF gain. That tallies with what I'm hearing- the RF gain has almost no
effect
on received sigs. So I'll look for whatever is pulling R1 down.
Thanks again- it always helps to have a second set of eyes.
73
Bruce
This sounds like the problem I had with the old 30m module, finally I
just took it out and re-installed, I never did figure out what I did
wrong although I'm sure one wire went in the wrong hole, then went in
the right one the 2nd go. 73 de Alex NS6Y.
On Apr 20, 2006, at 9:54 PM, Ron D'Eau
--
If you can lift one end of L6, you can then tell which side of it the short
is on. Since part of the mod was to install T2, I'd suspect it's somewhere
there. Maybe a short between the turns of the two windings since both the
primary and secondary of T2 have one end at DC
14 matches
Mail list logo
