[Elecraft] K3 FSK power transients

[Ken_ke2n via Elecraft]

Joe -  I am using data mode with "DATA A" selected.  (This mode uses the SSB
filter and turns off equalization and compression. But of course the ALC is
"on").

 

What would be really helpful is if you would download a copy of Spectrum Lab
and run the monitor output of your K3 through it while transmitting FSK441.
Then we would both have a common point of comparison (eliminating the
vagaries of power meter PEP algorithms).

 

http://www.qsl.net/dl4yhf/spectra1.html

 

The time domain scope is under the "components" tab.  The default settings
with the initial install will work fine, although you will have to select
your input device (audio card) if it is not the system default. That is
under the Options/Audio settings tab. 

 

Regards

Ken

 

From: Joe Subich, W4TV-4 [via Elecraft]
[mailto:ml-node+s365791n7603599h9 at n2.nabble.com] 
Sent: Thursday, May 28, 2015 10:27 PM
To: Ken_ke2n
Subject: Re: K3 FSK power transients

 


Are you using DATA A or trying to force FSK-442 through the K3 in 
USB with the TX_EQ enabled?  Again, I see *NO* frequency effects 
(crest factor < 0.1 dB at 30, 60 and 100 W) with my K3 when using 
DATA A and the LINE In. 

Also make sure your sound card does not have any "enhancements" 
enabled. 

73, 

    ... Joe, W4TV 


On 2015-05-28 9:53 PM, Ken_ke2n via Elecraft wrote: 


> 2015-05-27_20_48_16-Time_domain_scope_no_radio.gif 
>
<http://elecraft.365791.n2.nabble.com/file/n7603596/2015-05-27_20_48_16-Time
_domain_scope_no_radio.gif> 
> 2015-05-27_19_07_20-Time_domain_scope.gif 
>
<http://elecraft.365791.n2.nabble.com/file/n7603596/2015-05-27_19_07_20-Time
_domain_scope.gif> 
> 
> I hope this works. 
> 
> I have shown, in two attached images, the tones being produced by WSJT 
> FSK441 and then the monitor output of the K3.  You can see a substantial 
> drop off of the low frequency tones and some kind of additional modulation

> of the overall envelope (most noticeable with the higher frequency tone,
but 
> I think it affects all). Not sure if this is ALC action or something else.

> 
> Anyway, the K3 makes a bit of a mess out of some otherwise nice-looking 
> tones. 
> 
> Ken 
> 
> 
> 
> ----- 
> 73 
> Ken 
> 
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-----
73
Ken

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