Hi all:
Just as lots of folks needed a tutorial on what a roofing is (and
isn't), I'm sure there are at least an equal number (now including me)
that need an introductory course on Pan displays (specifically, what
we forecast Elecraft might do versus what Softrock can already do -
and not do).
I'll give my views as the designer of the Z90/91 panadapters. Others may
well have different views.
First, I have a definite bias to stand-alone equipment that works
without a computer. And, I have more computers around here than I can
keep track of, going back to a 386 monochrome laptop
KR2Q:
Just as lots of folks needed a tutorial on what a roofing is (and
isn't), I'm sure there are at least an equal number (now including me)
that need an introductory course on Pan displays (specifically, what
we forecast Elecraft might do versus what Softrock can already do -
and not do).
I don't have a SDR, but have been pursuing this idea on my LP-100
reflector with some sharp guys who do. What I have been able to gleen is
that with the best sound card currently available (which requires a
Firewire interface), you can get 192 kHz bandwidth to sample. After
filtering to
I don't want and wont have a computer in the shack.
I wonder why they can not down convert the IF to something
a cheap sound card could handle easy, or maybe they do?
Down convert, product detector, audio to sound card?
I personally would love a simple bandscope, with maybe a mouse
or some way
A 192 kb/s sample rate gives you a usable bandwidth (Nyquist = sample
rate/2) of 96 KHz, assuming a brick-wall anti-alias filter. More likely,
the usable bandwidth will be about 80 KHz with a practical anti-alias
filter.
Jack
___
Elecraft mailing
- Original Message -
From: Brett gazdzinski [EMAIL PROTECTED]
I personally would love a simple bandscope, with maybe a mouse
or some way to click on a signal to set the k3 to move the vfo
there, but just a band scope would be enough, without using
a hash generating, space hogging,
DOH! I knew I should have proofread that post before sending it ;-) Too
early in the AM for me. Yes, divide all my BW numbers by 2.
Larry N8LP
Jack Smith wrote:
A 192 kb/s sample rate gives you a usable bandwidth (Nyquist = sample
rate/2) of 96 KHz, assuming a brick-wall anti-alias filter.
Corrected text...
I don't have a SDR, but have been pursuing this idea on my LP-100
reflector with some sharp guys who do. What I have been able to gleen is
that with the best sound card currently available (which requires a
Firewire interface), you can get 192 kHz sampling. *After filtering
A 192 kb/s sample rate gives you a usable bandwidth (Nyquist = sample
rate/2) of 96 KHz, assuming a brick-wall anti-alias filter. More likely,
the usable bandwidth will be about 80 KHz with a practical anti-alias
filter.
Make that 80 or so kHz lower side band and 80 or so kHz upper side
Jack Smith [EMAIL PROTECTED] wrote:
First, I have a definite bias to stand-alone equipment that works without
a computer.
I'll second that!
.On HF, a panadapter can show you a pile up quickly, or in general give you
a good idea where the activity is at any given instant.
In a pile up
Yes, of course. I had forgotten it was an I/Q demodulator.
Jack K8ZOA
[EMAIL PROTECTED] wrote:
A 192 kb/s sample rate gives you a usable bandwidth (Nyquist = sample
rate/2) of 96 KHz, assuming a brick-wall anti-alias filter. More likely,
the usable bandwidth will be about 80 KHz with a
I didn't... and then I did... all in the course of a few minutes ;-) It
pays to put all your reasoning in your posts, so that you can convince
yourself all over again that what you're saying makes sense. I forgot
that and paid the price. Please refer to my original post and ignore the
Yeah, a panadapter is almost as good as turning the tuning dial G. The
panadapter lets one scan the band faster with a nice visual display, but it
may not show you all the signals.
There's a *huge* performance tradeoff involved in trying to see the a wide
frequency range on a 'scope and trying
Ron D'Eau Claire [EMAIL PROTECTED] wrote:
There's a *huge* performance tradeoff involved in trying to see the a
wide
frequency range on a 'scope and trying to hear *one* weak signal. In
receivers with a front end that is broad as a barn (including the first
I.F. in modern receivers), the
Yep! That's a huge advantage for the K3 in which one can open up the roofing
filter bandwidth for casual, non-critical operation and use a panadapter,
then close the bandwidth down by selecting a narrower roofing filter for
best dynamic range and weak-signal performance and give up the panoramic
I liked the band scope on the 756 pro, it did exactly
what I wanted it to do, which was to show any signals
close (+/- 12.5 KHz, or 25 KHz total) to where I was operating.
While working around the shack, I could see if anyone was
on without tuning anything.
They work real well on AM, not as good
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