[Elecraft] K3 pwr out on digimodes

[Julian, G4ILO]

Kenneth A. Christiansen-2 wrote:
> 
> +If the filter response varies across the passband, which it does, the ALC
> +will vary the amount of gain used to try to keep the RF level to the
> amount
> +it is set at, whether the signal is being generated near the edge of the
> +passband or at the center. This is important to the PSK31 operator who
> does
> +not want to tune every signal to the center of the passband sweet spot
> +efore hitting TX in order to get maximum power out.
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> I use the ALIGN function in MIXW or the similar functions in LOGGER or
> DM780
> to set my rig to a tone of 1500 hz for both TX and RX. That way I can use 
> the filters for receive and the same gain level for TX as I click on PSK31
> stations in my band pass. I did this with my IC-746PRO for the same reason
> as any ham grade filters I have ever seen have gain variations with
> changes
> in frequency. Three DB may not seem like much in the bandpass of a filter
> but it is a lot in terms of the output of the transmitter. You set for
> fifty
> watts and clean and find one hundred watts and distortion.
> 
> I have been using ALIGN for four years and the gain / frequency problem 
> has  become a non issue.
> 

I quite often do this myself in order to receive using a narrow filter.
Indeed, my own KComm program automatically centers a signal that you click
on if it is far from the sweet spot. But a lot of people don't like KComm
precisely because of that. The point and click method of operation inspired
by Digipan has come to be how many PSK enthusiasts expect to operate.

Many better programs than MixW and KComm (such as Fldigi) provide a
panoramic decoder of all the PSK signals in the passband. If you see a rare
one you want to work just ending a CQ you can instantly click on them and
call them. More than anything this is the time when you want your TX to be
putting out full power.

I agree, what you suggest is a workaround to the problem, but it would be
better if the workaround was not necessary.

-----
Julian, G4ILO. K2 #392  K3 #222.
http://www.g4ilo.com/ G4ILO's Shack   http://www.ham-directory.com/ Ham
Directory    http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3 
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