[Elecraft] Using USB mode for PSK31 rather than DATA A

[hb9ari]

Steve,

With my K3 , i use USB for PSK31 and i've set the
button "PWR" to 100W, the "LINE" (rear line input) to 50
and i adjust the output level of my sound card
with "Tune" mode of Digipan (a ~ single tone) to get ~ 50W average
output; during PSK31 transmission, i've an
average output power between 15 and 25 W depending upon transmitted text.
Sometimes, i do a little adjustment by lowering the audio
drive to NEVER get an average output power over 25W
(measured with LP-100A with a SWR <= 1.4:1 and 1.1:1 on the
K3 (ATU ON) )
I do test with a 2nd instance of Digipan running
with a 2nd TX/RX (FT857) and a 2nd sound card; i get an IMD between
-24 and -28dB; it should be a little better "ON AIR",
because i've a little "proximity" effect with my "Winter"
antenna at only 3 meters from my FT857....at the balcony.
Anyway, these values are not too bad and are a little bit
better than the average of received stations (between -16 and -24dB).

73 QRO de Rudolf, HB9ARI

PS May be it's not the best setup, but it work for me and
i announce a 25W to my correspondents.

Steven.Zabarnick at notes.udayton.edu wrote:
> No I did not turn off compression. I will give this a try. Has anyone else
> tried using PSK31 with USB mode?
>
>   
>> Did you turn compression off?
>>
>> Bob NW8L
>>     
>
> On Mon, Feb 16, 2009 at 12:12 PM,  <Steven.Zabarnick at notes.udayton.edu>
> wrote:
>   
>> After all this discussion of power control in DATA A mode vs SSB, I
>>     
> decided
>   
>> to try using PSK31 with USB mode, rather than DATA A. I changed the MIC
>>     
> SEL
>   
>> menu item to Line IN and adjusted the ALC meter to 4-5 bars using the MIC
>> GAIN control. The PSK31 power output appeared to closely match the K3
>>     
> power
>   
>> setting. Unfortunately, I received horrendous feedback about the widthand
>> IMD of my signal -- when I returned to DATA A mode, my signal width and
>>     
> IMD
>   
>> returned back to acceptable values.
>>
>> Steve N9SZ
>>     
>
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