On Thu, Dec 4, 2008 at 1:54 PM, Julian, G4ILO [EMAIL PROTECTED] wrote:
The one of the interesting things about using personal computers for SDR
is
imho that generally more people can take part in their development in
major
or minor ways. This is why I just recently decided to purchase the
On Thu, Dec 4, 2008 at 2:23 PM, Bill W4ZV [EMAIL PROTECTED] wrote:
Nico, this is truly exceptional phase noise performance! My sincerest
congratulations to you. Have you described how you achieved this somewhere?
73, Bill W4ZV
Not to speak for Nico, but direct sampling SDRs use a
On Thu, Dec 4, 2008 at 1:54 PM, Julian, G4ILO [EMAIL PROTECTED] wrote:
I was really more concerned with what support there will be for the current
generation of SDR radios in, say 10 years time. If the PC that runs the
current software dies, and you can't get a new PC that runs XP (or whatever
On Wed, Dec 3, 2008 at 12:55 AM, Joe Subich, W4TV
[EMAIL PROTECTED] wrote:
. You are making the incorrect assumption that we have no
control over the upper or lower limits. If band or sky noise
is the limiting factor on the low end, then adding
attenuation in front of the ADC to adjust for
On Wed, Dec 3, 2008 at 6:22 AM, Philip Covington [EMAIL PROTECTED] wrote:
On Wed, Dec 3, 2008 at 12:55 AM, Joe Subich, W4TV
I do not believe that any wideband SDR can cope with the
instantaneous peaks greater than the ADC rail in the
limiting condition (a large number of extremely strong
On Mon, Dec 1, 2008 at 8:38 PM, Joe Subich, W4TV [EMAIL PROTECTED] wrote:
Of course, but there is still a finite range between the
two limits. The maximum instantaneous peak is driven by
the number and strength of incoming signals and the minimum
discernable signal level is defined not by
On Mon, Dec 1, 2008 at 4:48 PM, Kok Chen [EMAIL PROTECTED] wrote:
On Monday, December 01, 2008, at 01:16PM, Bill W4ZV [EMAIL PROTECTED]
wrote:
...which is why the hybrid approach of a narrow roofing filter before the
ADC works so well in Orion and the K3.
Bill is correct.
Think of this
On Mon, Dec 1, 2008 at 9:02 PM, Bill W4ZV [EMAIL PROTECTED] wrote:
Joe Subich, W4TV-3 wrote:
Processing
gain may be of value at microwave frequencies with a quiet
sky but it is not going to help below 10 MHz with extreme
signals and high noise levels.
Joe, as near as I can tell, you've
On Tue, Dec 2, 2008 at 6:49 AM, Paul Christensen [EMAIL PROTECTED] wrote:
Its dynamic range may be OK for IMD but today's SDRs cannot approach the
BDR of
rigs like the K3 until even higher resolution ADCs become available.
Sorry to tell you a bad new: you are wrong!
Nico Phil,
When can we
On Tue, Dec 2, 2008 at 8:05 AM, David Woolley (E.L)
[EMAIL PROTECTED] wrote:
Philip Covington wrote:
problem of the phase noise of the LO. Even QSD based SDRs which use
a DDS for the LO have worse phase noise (and spurs) than the crystal
oscillator LO in direct sampling receivers like
On Tue, Dec 2, 2008 at 10:27 AM, David Woolley (E.L)
[EMAIL PROTECTED] wrote:
Philip Covington wrote:
On Tue, Dec 2, 2008 at 8:05 AM, David Woolley (E.L)
It may seem that way to you, but in real life it turns out the the DDS
generates spurs due to only approximating a sin function, clock
AB2TC wrote:
Hi,
I, too, would be very interested in seeing how entire HF spectrum digitized
at once receivers would fare in the real world. I am *very* skeptical.
Although the Perseus (with that architecture) receiver fares relatively well
in the recent ARRL test, the testing completely ignores
On Mon, Dec 1, 2008 at 1:29 PM, Bill W4ZV [EMAIL PROTECTED] wrote:
Alan Bloom wrote:
On Mon, 2008-12-01 at 06:35, ab2tc wrote:
Hi,
I, too, would be very interested in seeing how entire HF spectrum
digitized
at once receivers would fare in the real world. I am *very* skeptical.
Although
On Mon, Dec 1, 2008 at 3:56 PM, Joe Subich, W4TV [EMAIL PROTECTED] wrote:
This is not correct. You can't just compare the number of
bits without taking into consideration the ADC sampling rate
and signal bandwidth. Please see the concept of signal
processing gain or process gain.
The
On Mon, Dec 1, 2008 at 4:16 PM, Bill W4ZV [EMAIL PROTECTED] wrote:
Joe Subich, W4TV-3 wrote:
This is not correct. You can't just compare the number of
bits without taking into consideration the ADC sampling rate
and signal bandwidth. Please see the concept of signal
processing gain or
On Mon, Dec 1, 2008 at 1:29 PM, Bill W4ZV [EMAIL PROTECTED] wrote:
73, Bill W4ZV
P.S. How many hits for 1000 or 5000 in the contest soapbox so far?
ZERO. (Which says something about SDRs in use by real contesters).
Not from the contest soapbox, but...
GI4NKB Awarded First Place for
16 matches
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