There is also a capacitor in the 10dB amplifier after the driver, and it
is on the bottom of the RF board and sometimes overlooked. If you leave
it off, the ALC will be able to pump up gain in later stages but output
on the higher bands will fall off. Just check to make sure it is
there...there should be no empty screened ovals on the bottom of the RF
board.
73,
Leigh/WA5ZNU
On Sat, 10 Jun 2006 3:39 pm, Don Wilhelm wrote:
Bob,
The output should not fall off that drastically on the higher bands.
Expect
a minimum of 10 watts on 10 meters.
I suggest that you check the value of each and every component in the
transmitter amplifier chain (those components on sheet 4 of the K2
schematic). Check all of them for proper value and good soldering. If
you
find nothing awry in that examination, then measure the RF Voltages at
each
stage shown in the troubleshooting section of the manual under transmit
signal tracing. Compare the RF Voltage levels on 2 bands (one of which
seems to be OK) to determine the stage where the output drops
dramatically.
Once you have located that stage, we can help you isolate to the
problem
component.
73,
Don W3FPR
-----Original Message-----
K2 #5216 is finished an on the air, with one contact so far on
20m. It will take a little getting use to how it operates. It's a
pleasure to have a CW filter after the FT817's wide-open band pass.
There appears to be very little power on the high bands (less
than a watt on 10 and 12, Not much better on 15m). 80 meters and
40m are not the best either, with lower power than expected and
some variation i noutput between keydown attempts. Only 20 and 30
appear to match the Power level indicated and what is actually
put out to the MFJ ATU/pwr meter. The receiver seems OK on all bands.
I assume that this is an alignment problem or some parts are
not installed right. I'll call Elecraft next week to see what can
be done. During the alignment (with the DL1 and Ngen) the power
was very low on the high bands (0.5 W) and on other bands it
would often read 8 watts when the tune function was on. That made
it hard to align the transmitter with the DVM on the DL1. The
NGen was great for alignment and I hated to disturb the settings
during subsequent transmitter alignment. I'll download the
Spectrogram for later use.
Does this situation sound 'normal' for first-time usage?
Bob VA3RKM (Ottawa)
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