Sorry Don,
I was using the DMM leads and not the RF probe to read the voltage on the
DL1 measuring 6 volts.
Thanks again Don,
Ed
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Ed,
Not enough information, so I am forced to make assumptions.
Are you using the RF probe to measure the RF voltage across the dummy
load? If so, 6 volts yields 0.72 watts as you stated, but if you have
the Elecraft DL1 and measure 6 volts, the power is 1.49 watts.
Adjust R1 to agree with the
Don,
When I use the DMM and measure the Voltage across I am only getting 6.0
volts. When I plug that into P=V*V/R I get .72volts. I have also noticed
that when I push TUNE I sometime see a fluctuating power indication and
other times I see 2.4f 0.0r. So what should I be looking at to adjust R1.
Ed,
I would also recommend doing the power calibration on 40 meters - it is
a good compromise. There \is some variation in the response of the
diodes with respect to frequency, and also, if you are using an
oscilloscope to measure the RF voltage, the bandwidth of the 'scope can
cause some "co
Ed,
With the Elecraft DL1, just use the DMM probes.
If you do not have the DL1, connect the RF Probe across the dummy load
(use a Tee adapter if you do not have direct access to the dummy load
terminals) - but keep the power to 5 watts or less to keep from zapping
the diode in the RF probe.
Yo
Thanks Don,
I will give that a try. Should I use the RF probe that I made or just use
the DMM probes?
73,
Ed ke7hga
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Ed,
Do I recall that you have the Elecraft DL1? If so, you have the perfect
item for calibrating the power - in fact, better than most wattmeters.
Just measure the DC voltage at the diode and calculate the power - set
the forward voltage pot so the K2 indicates that same power, and job done.
Okay Don thanks again. I did not indicate any voltage during receive. I
think I'm going to wait until I get some sort of watt meter before I
continue. But I'm off to work so that will have to wait until next month.
73,
Ed ke7hga
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Ed,
No, R6 will not influence the bridge null. You are instructed to leave
it out until you check the voltage at U4 pin 1, during receive - it
should be zero - but you can also check that with R6 in. The zero
voltage in receive is the important one to the rest of the K2. If you
do detect vo
Don,
I just realized that I had done the Bridge null adjustment with R6
installed. So should I remove it and start over?
73,
Ed ke7hga
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Don
I was using a cable to connect my Dummy load to the tuner. So I decided to
see if maybe the connection could be bad so I connected the tuner directly
to the #1 antenna jack and that was it. Now I have a steady power ready of
3.0 volts.
Thanks again.
73,
Ed ke7hga
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Thanks Don I will start looking into those areas.
73,
Ed ke7hga
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Ed,
The most common cause is T1 connected incorrectly or having
insufficiently stripped and tinned leads, so check that first.
The HiCur message may indicate a bad or incorrectly oriented diode.
Check all the components in the wattmeter area for good soldering and
correct values T1, D1, D2, C54,
Hello,
When I adjust C55 I initially get a high current message that last for a
second, followed by a fluctuating power indication. The lowest I can adjust
c55 down to is 1.7 volts.
So what have I missed. Thanks in advance.
73,
Ed ke7hga
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utput!
:-)
-Original Message-
From: k4zm [mailto:[EMAIL PROTECTED]
Sent: Saturday, September 17, 2005 4:28 PM
To: Sanger, Joseph
Subject: Re: [Elecraft] KAT2 - Bridge Null Adjustment problem
Have you installed R6 yet? Page 17 - 5th step is to install a 47 ohm
1/4
watt resistor in the KAT2.
The first thing that occurs to me is that the single turn of wire through
the center of T1 may be missing. The second thing is that T1 itself may not
be properly wound or properly soldered. Check that the proper color wire is
inserted into the proper holes (the color of the wire in hole 2 should
Well, my KAT2 saga continues.
I did indeed find some unsoldered pins on one of the relays, and
corrected this.
Now, however, I seem to have the opposite problem. When trying to
perform the CALn procedure, instead of having too much reflected power,
I now have no power (forward or reflected
I am having difficulty performing the Bridge Null Adjustment of C55 on page 16
of the manual and could use a little help, if you please.
I am unable to get the ATU CALn measurement of reflected power to be anything
but ‘HI’ … in other words, no null. I have checked the SWR bridge components
an
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