[Elecraft] K3 FIRMWARE UPDATE: MCU 1.87, DSP 1.69 (Finally!)

[G4ILO]

Bob Cunnings wrote:
> 
> I have set up for PSK31 operation with the new firmware and am getting
> exactly what I expect. I'm using a peak reading external meter and it
> agrees with the power commanded and the power indicated on the K3
> front panel RF meter. First I adjusted audio drive to get 4 bars on
> the ALC meter using a pure tone (Digpan tune mode), and could then
> adjust power at will with the power indicated on the external peak
> reading meter tracking the power control nicely.
> 
> PSK31 "idle" average power is about 50% of the key down (single tone)
> power. Using Digipan tune mode I see commanded power equal to
> indicated power when the external meter is set to read either peak or
> average (of course).  When sending PSK31 idle I must have the meter
> set to read peak to get agreement with the front panel RF meter, which
> makes sense since the change notes state:
> 
>  "The RF power bargraph shows approx. peak power..."
> 
>  (in the SSB TX POWER CONTROL section).
> 
> Are you adjusting audio drive to get 4 bars of ALC with a pure tone?
> 
> Bob NW8L
> 
> 

I have PWR set to 5W. I'm sending a pure tone at 1KHz which is my preferred
center frequency for data modes. I increase the LINE level until I get 5
bars of ALC. If I stop when it gets to 4 the ALC display is flickering like
the bars keep on being redrawn. I'm getting 5 bars with LINE = 36. However,
the power meter reading stops increasing at about 2.8W, when LINE=32 which
gives 4 bars. I cannot get more than 2.8W with PWR=5W when sending a pure
tone. The meter reads exactly what PWR is set to in CW mode. When
transmitting an idle signal the meter reads a bit less than half the value
it showed on the pure tone. If I set PWR to 12W I'm currently getting about
6.5W on the pure tone.

Now if I set PWR to 12W, giving as I say about 6.5W out, and then back the
PWR control down, then the power starts to reduce once PWR gets to 6.5W, and
when I get to 5W the meter also shows 5W out. It holds that level on
subsequent transmits, and if I transmit an idle tone I get just over 2W
shown on my (non peak reading) meter, which is what you would expect at that
level. If I then press TUNE, and then try transmiting in DATA A again,
either a pure tone or an idle signal, the output reverts to the lower level
again.

-----
Julian, G4ILO  K3 s/n: 222 K2 s/n: 392
G4ILO's Shack: www.g4ilo.com
Zerobeat Ham Forums: www.zerobeat.net/smf
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