FW: PSK31 question

[Dan Barker]

Interesting. K2 says 0.3 Watts at 1 Amp draw. 3.3 Watts at 2 Amp. Can't do
10 (3A supply). Maybe that's why San Diego said I was hard to copy!

I had to hook up the straight key to get those figures. The AT intercepts
the Tune button. I think I'll see how bad my fist has gotten. I hope 20
meters is ready for me!

Dan / WG4S / K2 #2456

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]]On Behalf Of Dan Barker
Sent: Saturday, November 13, 2004 4:14 PM
To: Elecraft
Subject: FW: [Elecraft] PSK31 question


Not sure I see the difference between setting requested power at 15 W, and
driving for 5, and setting requested power for 10 and driving for 5. Setting
requested power for 10 and getting an ALC light to just light sounds like
the ALC would be distorting my signal a bit.

<snip>

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[Ron D'Eau Claire-2]

Ha! I fire up PSK31 from time to time, make a contact, then it's back to CW
for the next six months!

Some modes, like some gear, are fun to tinker with in order to master the
techniques of making them work, but that doesn't mean that I'll enjoy using
them on the air all that much.

As for keeping the audio below ALC threshold in SSB modes, the only issue I
can see is when the K2 is able to deliver more than rated power (10 watts
for a basic K2). At power levels above the rated maximum the finals may not
be as linear as they should, producing more distortion. So if all your K2
can make with the POWER control fully CW is 10 watts (like many of them on
the upper end of 10 meters), then it's not a problem. But down on 40 meters
the finals can be over-driven. That's why they make more than 10 watts of RF
on that band. That's fine for CW in which linearity in the finals is not
important, but not good for SSB which requires a linear power amplifier.

I've never seen any distortion numbers from Elecraft, but only noted that
the manual cautions against operating with the POWER control above that
which the K2 could deliver, or trying to run more than 10 watts output in
SSB with a QRP K2.  

Ron AC7AC



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