[Elecraft] JE3HHT FREE software DSP versus the Kdsp2

Eric Manning [email protected]
Sun May 25 17:47:02 2003


I downloaded the JE3HHT dsp freeware
recently mentioned on this list, and ran it in my Sony Picturebook. 
The audio from my K2 goes to the Picturebook sound card  and I listen 
to the computer's audio output, the computer running the JE3HHT 
software acting as a dsp filter.

Good news:
1] free
2] VERY effective -- suppresses background [thermal] noise like 
magic, provides nice rectangular filters.

Bad news:

1] It's completely unsuitable for CW operation, because the filter 
adds noticeable  delay to the audio signal path, INCLUDING the 
transmit sidetone.  I cannot send CW when I hear the sidetone only 
after such a delay. Several OMs I worked using the freeware during 
the WPX think I'm drunk, or a lid, or both.

[The kdsp2 avoids this problem, by injecting sidetone AFTER the filter delay.]

2] The transmeta cpu in my picturebook laptop does not have the 
necessary oomph, so the audio is interrupted frequently by cpu 
overload.  The freeware  might be marginally OK for SSB-only use with 
a faster cpu, but I doubt it.

SO, by all means play with the JE3HHT dsp

[www.qsl.net/mmhamsoft/dsp/index.htm ]

while you're waiting for your kdsp2, but forget about saving $$ by 
using it instead of the kdsp2.

[JE3HHT says the same thing in his user's guide .]
-- 
Eric Manning   VA7DZ VE3DPV
K2 #2561 "Pauline"

If God intended you to use SSB, He wouldn't have given you a fist. Or 
two lungs.

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