David Gilbert wrote:
make them unusable for recording simple RF. A DVR might not have that
problem, although noise and signal levels could still be an issue. It
might also be the case that any standard video recorder (or at least the
software associated with it) might try to insert sync
Makes sense.
I guess someone wanting a cheap and dirty solution would have to use a
down-converting mixer and record to a file via a sound card, and then
mix back to a ham band (assuming, as I suspect would be the case, that
for a demo they'd be willing to put up with the image and carrier).
Don,
The main difficulty I believe with down-converting a band to audio, and
then up-converting back to RF to demonstrate the performance of the P3,
could be the spurious products generated during each conversion, which might
reflect badly on the true performance of the P3 if the products
Looks like we may have someone bring a P3 to demo at the Huntsville (AL)
Hamfest. Is there a way to demo it, connected to a K3, without an antenna?
We'll be deep in the Civic Center.
73,
Randy, KS4L
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Randy Moore wrote:
Looks like we may have someone bring a P3 to demo at the Huntsville (AL)
Hamfest. Is there a way to demo it, connected to a K3, without an antenna?
We'll be deep in the Civic Center.
I'd be surprised if you couldn't see something with a piece of wire
connected to the
Looks like we may have someone bring a P3 to demo at the Huntsville (AL)
Hamfest. Is there a way to demo it, connected to a K3, without an antenna?
We'll be deep in the Civic Center.
I've tried two demos of the P3 inside a building.
The first was in a restaurant in Tucson, AZ. We were able
, August 09, 2010 10:28 AM
Subject: Re: [Elecraft] How to demo P3/K3?
Looks like we may have someone bring a P3 to demo at the Huntsville (AL)
Hamfest. Is there a way to demo it, connected to a K3, without an
antenna?
We'll be deep in the Civic Center.
I've tried two demos of the P3 inside
Subject: Re: [Elecraft] How to demo P3/K3?
I've seen this device used at several hamfest for demonstrating ICOM rigs
such as the 7600 and Flex Radio. It's called the Time Machine.
http://www.expandedspectrumsystems.com/prod2.html
It's hard to tell the difference in a recording and the real thing
Baseband TV video is somewhere around 4 MHz, so I wonder if it would be
possible to record some 80m activity using the video (yellow) input of a
VCR or DVR, and then feed the recorded signal into the K3 at the
hamfest. You'd have to pay attention to signal levels ... it probably
would
The machine will expect synchronizing pulses to lock up the head and capstan
motors. Without sync some machines will not even go into the record mode, if
it does noise will really confuse the motor servos.
The pass band of a video recorder for NTSC (analog) is not necessarily flat
to 4 MHz.
Ray, K2ULR, mentioned to me that VCR's probably use the sync pulses of a
normal baseband video signal to sync the rotating heads, which would
make them unusable for recording simple RF. A DVR might not have that
problem, although noise and signal levels could still be an issue. It
might
Dave,
You don't have to build that mixer to shift the ham band down to the
audio range, a Softrock receiver will do that.
For that matter, you don't need the I and Q channels, so any DC receiver
without audio filtering after the mixer will do that job too.
Turning it back into RF is the bigger
True, but I figured more people would be able to build a simple mixer
than happen to own a DC receiver, especially if time was a consideration
prior to the hamfest (per the original query). And I didn't think the
carrier or opposite sidebands from the up conversion would be an issue
for a
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