Bernie,
Are you tuning the desired signal to your sidetone pitch - use the SPOT
and match the signals to the same tone - when the two are quite close in
pitch, you will hear a WOW WOW WOW sound of the beat frequency. When
that beat sound slows down to nothing, you are at Zero Beat. Adjust the
AF Gain control (and the ST L menu if needed) to make the amplitude of
the sidetone and the signal about the same to hear that beat note best.
If your tuning is not the problem, then give it another try with
Spectrogram and a noise generator.
Make certain the CW DAC values (or frequencies if you are displaying
that) are lower than the CWrev values.
Also make certain the menu sidetone pitch setting matches the center
frequency you set for FL2, FL3 and FL4. The transmit frequency is
offset by that amount by the firmware.
For FL1, since it is wide, you cannot set its center at your sidetone
pitch, but the passband must be entirely within the Spectrogram
display. Make sure you can see the left side of the passband skirt drop
down significantly before reaching zero frequency. Failure to do that
will cause loss of the Single Signal reception - in other words, you
will hear part of the opposite sideband.
There are also instructions on my website www.w3fpr.com. Look at part 3
of the article on K2 Dial Calibration.
BTW - multiply those widths by 10. That is a 700 Hz filter, not 70 Hz.
The last zero is not displayed.
73,
Don W3FPR
On 12/31/2012 12:42 PM, Bernie KF0QS wrote:
Dear Folks:
I am the proud owner of K2-10 #6922 and, so far, have been operating it
exclusively on cw (I am building the SSB option right now, though I am a
brass pounder). It is a fine radio and has caused my TS-850S and AL-80 amp
to gather a lot of dust.
My only problem has been the filter alignment. I have repeatedly tried to
align the filters, and always seem to end up with a situation where the
passband of the filters never falls within the passband of the receiver at
its maximum bandwidth (I have it set for 150hz). In other words, the
received signal, when the receiver is right on it, always seems to fall
outside of the 70hz filter (if I tune the receiver to copy the received
signal with the 70hz filter in use, and then switch to the 40 and 20hz
filters, the signal stays within the bandwith).
The last time I tried to align the filters, I used a noise generator and
Spectrogram, and followed Tom Hammond's (N0SS) instructions. After doing
this, I always need to turn on the RIT and turn a few hz below the received
signal to bring it within the bandwith of the 70hz filter.
What am I doing wrong? For reference purposes, I have my sidetone set for
600hz.
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