On Mar 4, 2005, at 1:20 AM, Eric Swartz WA6HHQ - Elecraft wrote:
OP1 is the KSB2's SSB fixed b/w filter, which has been optimized for
minimum ripple at one SSB b/w. In SSB it is always used for transmit,
but it or any of the CW filter bandwidths can be used for receive.
Here's an
In 70's tight short skirts were popular.
I drove a Lotus and enjoyed the view
watching dates slide in and out of the Europa.
BTW still have car and girl friend is my wife
for last 33 years. Tim W4YN
Tim O'Rourke
[EMAIL PROTECTED]
___
Elecraft mailing
You fared better than I did Tim. I had a '76 Europa Twin Cam, the black
JPS job with gold pinstripes. Eventually sold it for lack of garage
space... my wife was happy, my son hated me ;-) I loved scaring people
by taking corners at speeds they thought were impossible.
Still married after 28
: [Elecraft] Tight Skirts
You fared better than I did Tim. I had a '76 Europa Twin Cam, the black
JPS job with gold pinstripes. Eventually sold it for lack of garage
space... my wife was happy, my son hated me ;-) I loved scaring people
by taking corners at speeds they thought were impossible
Merlin, W3ICT wrote:
...nobody else I've observed on this net seems to be as annoyed as I about
the bad
skirts, high ripple, bad ultimate selectivity, etc. when the K2 is used
with the
KSB2. ...On sideband, tight skirts (the electronic kind, gentlemen!) are
terribly
important, maybe more so
Sounds like the age old debate in the hifi world about the sweet sound
of tube amplifiers vs. the hard sound of clearly superior modern solid
state amps.
Preferences aside about slopes and shape factors... I'd like to have
MUCH better ultimate rejection... and a true rf clipper would be a
We designed the KDSP2 to improve ultimate SSB filter ultimate rejection
in the K2.
The KDSP2, with its brick wall SSB filter settings, when cascaded after
the KSB2 filter, totally eliminates any residual leakage from strong
signals outside the passband. It also tightens the net filter shape
OK Eric... I just picked up my radio used, and I haven't checked the
alignment yet... this was just an impression I had. I'll put it on the
bench and make some measurements before commenting further.
Larry N8LP
Eric Swartz - WA6HHQ, Elecraft wrote:
We designed the KDSP2 to improve ultimate
You may have just sold me on a KDSP2 down the road Eric. I just ran some
tests on my new used K2 (#568), and to cut to the chase... I measured
ultimate rejection out 5 kHz as 80dB with the KSB2 OP1 filter in, better
than you indicated. But with FL2, which is set for 1.8 kHz, I measured
Hi Larry,
OP1 is the KSB2's SSB fixed b/w filter, which has been optimized for
minimum ripple at one SSB b/w. In SSB it is always used for transmit,
but it or any of the CW filter bandwidths can be used for receive. Looks
like you are using one of the CW settings at 1800 Hz..
Any of the
Oops! - I missed one point in your email. Yes, the above board mounting
of the KSB2 reduces ultimate rejection due to its longer ground return
paths. But as you noted, with 80 dB of ultimate rejection, following it
with the KDSP2 kills any residual blow by.
A number of the $3K and above DSP
After having fingers burnt while designing very 'srtrong' receivers, may I
add comment.
IF filters with very tight skirts do allow the recovery of very good SSB
audio or CW. To do this the filter must NOT have sharp corners at the top of
its 'response', the corners should be a little rounded.
Eric wrote:
The SSB OP1 filter can be used with different
BFO settings in each of the four SSB filter memory settings, creating
low and high cut settings.
I installed the mod kit to widen my OPT1 filter and I'm really pleased with
it. Listening to AM stations, the K2 sounds as good as most any
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