Chris,
I cannot relate 'sidetone in the headset' with SSB operation. In CW,
there is a sidetone presented to the headphones or speaker which follows
the keying, but there is nothing of that sort for SSB. If you lost your
CW sidetone while using the K2 memory, that is quite another matter.
The K3 does provide a means of monitoring the transmitted audio (but
that is not a sidetone), but the K2 does not - an external receiver with
a short antenna while the K2 is operating into a dummy load can be used
to listen to your transmitted audio.
As far as the 'murmur', please try to be more descriptive - I can only
guess that it might be either room noise pickup by the microphone or it
could be incomplete carrier suppression or possibly some sort of RF
Feedback due to 'RF in the shack'.
If you have an oscilloscope or other means of detecting a low level RF
signal, you can set the carrier balance pot with more precision than by
using the method described in the manual. Do not connect a microphone
but do connect a key or paddle - connect the 'scope or other detector
across a dummy load. Then go to LSB mode and close the dot paddle or
handkey and adjust the carrier balance pot for minimum carrier - switch
to USB and check the carrier balance again - you may have to go back and
forth between LSB and USB to obtain the lowest compromise setting for
both sidebands. Properly adjusted, the K2 carrier balance is excellent.
You may also want to re-check your OP1 passband setting using
Spectrogram. It is important to place the low frequency corner (-3dB
point) of the passband close to the 300 Hz point for both LSB and USB.
If you have the stock 2.4 kHz SSB filter, set the Spectrogram markers at
300 and 2600 and center the passband between those markers and it will
normally be correct for both transmit and receive. See the filter
setting information in part 3 of my K2 dial calibration article on my
website http://w3fpr.qrpradio.com for additional information about using
Spectrogram for setting the SSB filters.
73,
Don W3FPR
Chris Kantarjiev wrote:
Even though I built and installed a KSB2 a year or so ago, this week
is the first time I've actually used it. I have to admit, phone
operation is sort of fun, though I'm not likely to spend much time
outside contests doing it - altogether too much like a telephone.
One question: there doesn't seem to be any sidetone in the headset
when I transmit. I made some recordings of my audio output (to
play back for W7GH, who was also testing out his KSB2), and we
both noticed that there is some ... murmuring when I'm transmitting,
but nothing intelligible.
I thought the lack of sidetone would be an issue, but it doesn't
seem to be. Still, I'm curious - what's the murmuring? Should there
be audible sidetone?
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