hb9ari wrote:
>
> Hi Trev,
>
> Since the beginning, i always get the same behavior
> with my K3 #1212 (factory build). I work
> essentially with JT65A mode; as this mode
> is a single tone mode, i've set the modulation
> level just before full ALC and power to 50W
> (for DX only...). At the beginning of a
> JT65A transmit sequence, the power start
> at ~ 25W and go up to ~ 48W in 3 to 5 sec.
> If the PA temperature is at ~ 40 to 46°C,
> the power variation is lower and power
> output start at ~40W; i'm certainly
> wrong, but i've always thought that this
> was related to PA temp and, as i never get
> an output power higher then selected,
> this was not a problem in my case.
>
> What is a problem for me is the transmit
> audio response; i've tried to adjust XTAL filter
> without success; TX EQU compensation
> too. As my VFO working frequency
> is always set to the JT65A "preferred"
> frequency, it's the audio frequency who
> defines the actual output spectrum;
> for some audio values, i get well over 3dB
> output power variations between some
> JT65A instantaneous frequencies; for example,
> with a 45W max power, for somes frequencies,
> level go under 20W; i work with this since more
> then one year and i'm always hoping that
> the AGC of my correspondent can handle
> a "little" ~3dB RF input variation (the QSB
> is generally higher...)
>
> Sorry for this time and bandwidth consuming
> message.
>
> 73 QRO de Rudolf, hb9ari
>
>
Are you not using DATA A for this, Rudolph? If so, you can set the audio
drive for a steady 4 bars in the "ALC" scale and the K3 will adjust the
power for the value selected across the whole range of the audio spectrum
(that you might reasonably want to use.)
It didn't always work like this, but it has for many months now. Using PSK31
I can click on a signal anywhere from about 300Hz to 2700Hz, call them and
get exactly the power requested (within reason, of course.)
-----
Julian, G4ILO. K2 #392 K3 #222.
* G4ILO's Shack - http://www.g4ilo.com
* KComm - http://www.g4ilo.com/kcomm.html
* KTune - http://www.g4ilo.com/ktune.html
--
View this message in context:
http://n2.nabble.com/K3-Power-Output-tp3563445p3565662.html
Sent from the [K3] mailing list archive at Nabble.com.
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
