Jason: You've already gotten some good comments. Don is right to ask
if you're getting problems with the dummy load. The fact that you are
bouncing your tv around sounds like you've got a somewhat makeshift,
and possibly unstable, antenna. That could be causing the problem.
One thing that I don't believe was mentioned has to do with the HI CUR
setting you've got. If you have it at the setting given in the manual
(at least the earlier version of the manual I used with s/n 744), it is
likely to be very conservative. You can raise it to 3.25 amps, and
that may help. But don't do this until you get a decent antenna going.
best wishes,
dave belsley, w1euy
On Mar 12, 2005, at 5:32 PM, Jason Marten wrote:
Ok, I've got a couple of problems here with my K2, I was wondering if
anyone could help.
I put together my K2, as best as I could. It receives fine (as far as
I can tell) on a couple of bands that I've tried so far. I haven't
really put it through the test of transmitting. However, it does heat
up my dummy load, and causes the TV in the adjacent room to thump when
hooked up to an indoor random wire (one reason why I haven't
transmitted much!). I sometimes get HI CUR warnings, even when at 5
Watts.
The only trouble I had with testing and alignment was under Part 3 of
the RF board, under "Transmitter Alignment". My problem here, is that
when I adjust L9 (30 meters) and C23 (20 meters) for maximum output, I
don't really see a peak anywhere around 2 Watts, if I turn it just a
little bit it goes way past 2 Watts until I get a HI CUR warning.
I've tried this many times, and I always get the HI CUR warning. I
decided to get L9 and C23 close to 2 Watts, and went on with aligning
and testing.
A little while ago, I brought my K2 into a club station, and even at 5
Watts, I noticed I was getting HI CUR warnings a lot, so I stopped
using it and I decided to go through troubleshooting (signal tracing
and voltage checks) to try to see if I could find anything.
I built the RF probe. "Preparation for Receiver Signal Tracing" (Pg
10) went fine. Same with "PLL Reference Oscillator and VCO" (Pg 10)
and "BFO" (Pg 11).
On "Low-Pass Filteass Filter, and T-R Switch", I have some questions
and problems. It says to use a signal generator or test oscillator.
Will the XG1 work here? This is what I was using, but it mentions
setting the signal generator to 0.14 Vrms. Does this part not apply
to the XG1, and which setting should I be using on the XG1?
Then, when is says to hook up the probe to D6 and adjust the band pass
filter for a peak reading (I was trying to adjust L1 and L2 for 40
meters using the XG1), I could not get any reading other than 0 volts.
Also, on the following readings (W1, W6, both sides of D6, etc), I
also kept getting 0 volts. I've been trying to look at the schematic
to see where to look, but haven't been able to figure things out.
Do I have some sort of problem with the Band Pass Filter? Where do
you suggest I look for problems? Thanks!
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