[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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