[Elecraft] Elecraft P3 panadapter at the Orlando Hamcation

[N8LP]

You're comparing apples to oranges, Joe. PowerSDR and other SDR apps which
use sound card interfaces have to process a whole lot more data than the K3
does. So do the sound cards and their drivers. The K3 is concerned with the
speech passband, while many of the SDR apps process hundreds of kHz worth of
bandwidth in realtime. 

For kicks, I just ran a quick test using LP-PAN/PowerSDR-IF v1.19.02. I
compared the timing of the K3 output to the PC sound card output for 7
different sound cards on two PCs, an older P4 desktop and a year old, dual
core laptop. I also tried several different SDR apps, but not all the apps
were capable of providing sound card output with all the cards. I used 192
kHz sampling whenever possible, with a buffer setting of 2K and ASIO driver. 

In general, I found a delay range of about 15-30mS, depending on card, app
and sample rate. With the popular E-MU 0202 USB card and PowerSDR-IF at 192
kHz using the standard settings, the result was 21mS (1/50 of a second) on
my laptop. PowerSDR was no worse than the other apps. 

The delay has never really bothered me. I don't listen to both the K3 and
PowerSDR at the same time... at least not the same signal. I mainly listen
to PowerSDR in MultiRX mode when running split so that I have dual
receivers, or when listening to AM broadcast. Otherwise, I just listen to
the K3 and use PowerSDR only as a pan display. 

Contrary to your comment that PowerSDR is the worst part of the Flex radios,
a lot of Flex owners only migrated to the K3 after seeing that they could
still use PowerSDR, which was their favorite part of the Flex radio. I have
heard this comment more times than I can count.

73,
Larry N8LP









>  Don't forget that the LP Pan allows you to run the SDR-IF 
> software suite. 

Why would you brag about bringing the worst part of the 
Flex-radio to the K3?  PowerSDR is the worst interface 
in the world for a radio ... the FFT delays make the 
K3 monitor sound instantaneous. 

73, 

   ... Joe, W4TV 
 

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