Jim,
The K2 will sometimes display the Power or Speed when the VFO is turned.
It does not happen frequently, but does show up when the MCU is busy
doing "its" thing. It only comes on for an instant and only
occasionally. So conclude that "it just does that" and ignore it, there
is nothing wrong.
As for the high frequency hiss on SSB filters FL2 to FL4, look carefully
at the width of those filters using Spectrogram. Adjust the filter
width of FL2 to be about 200 Hz less than FL1, FL3 200 Hz less than FL2,
etc.
For many K2s, the filter width displayed by the K2 is much greater than
the displayed width.
Set the filter widths using LSB mode - first set the low frequency end
of the filter between 300 and 500 Hz. Then reference the high frequency
end of FL1 (the OP1 filter). Place a Spectrogram marker 200 Hz below
the high frequency end of FL1 (the frequency of the cursor is displayed
in the panels at the bottom of the Spectrogram display). Adjust FL2
high frequency end to place the "corner" at the marker. Set a marker
200 Hz lower and do the same with FL3 - similar for FL4.
Now, switch to USB and adjust the BFO settings to place the filter
passbands properly (low frequency end between 300 and 500 Hz).
That should produce good filters without as much high frequency hiss.
The K2 audio amplifier is by design "wimpy" to reduce current draw for
those operating portable on batteries. An amplified speaker should be
able to make up for that low audio.
73,
Don W3FPR
On 1/30/2019 7:02 PM, Jim KO5V wrote:
Good evening,
I have been enjoying my newly-built "K2 twins" over the last few weeks (K2
#7225), but so far, only on 20M and 17M - there's been no propagation on the higher
bands, and I'm currently antenna-challenged on 30M and down. I measure full power out
from the KPA100 with my LP-100, and the KAT100 works well into a fairly marginal antenna.
I'm getting good audio reports using the MH2 mic.
1. Four times, I've seen the LCD go into the "power adjustment" screen just as I start to
adjust the frequency. As I continue to turn the knob, the display goes immediately back to
frequency. I'm using an after-market CNC'd aluminum knob with a "bearinged" dimple. It's
the same diameter as the stock knob, but a bit heavier, and it is just rubbing the felt washer. I
wondered the first time this happened if this was maybe a static discharge as I touched the knob,
but I didn't feel or hear anything. The last couple of times, I thought it might be a mechanical
issue due to the interference of the encoder and front-panel board(s). Any ideas?
2. I set the filters with the N-Gen and Spectrogram, using the instructions on
Don's website. The filters work as I expect them to, but at times there is a
loud, high-frequency hiss on SSB filters 2-4 that is rather annoying. Can I
just play with the position of the signal in each pass-band to help this, or is
there something else I should look at? The signal I want to hear is audible in
all four filters, so I think they're set properly - I just want to improve them
if I can.
3. I am using an external, amplified speaker, made for mobile use, because the K2's audio
seems a bit low. Is this normal? This solution is fine with me; I just want to
"hear" what other folks have experienced.
Thanks in advance,
73, Jim KO5V
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