Connecting a panadapter *after* the crystal filter would indeed be an
exercise in futility.
The normal connection point is to the post-mixer amplifier ahead of the
crystal filter via a high input impedance buffer amplifier, and thus the
only selectivity of importance is that of the K2's input bandpass
filters. The bandpass filter width depends upon the band selected, but
in the worst case is several hundred KHz wide.
The Z90's widest built-in span is 200 KHz, and the widest permitted
user-defined span is 250 KHz. These limits are set by the maximum filter
bandwidth within the Z90 (1 KHz) and the number of data points taken
when the data collection is set to maximum (240 data points).
Jack K8ZOA
www.cliftonlaboratories.com
Rob Locher W7GH wrote:
Hi Jack,
My budget unfortunately doesn't have any room for one of your
panadapters at the moment, but I'm curious anyway: how much bandwidth
do your panadapters show when connected to a K2? Does the bandwidth
vary depending on which crystal filter is selected?
73,
- Rob W7GH
On Mon, 26 Mar 2007 16:43:23 -0700, Jack Smith
<[EMAIL PROTECTED]> wrote:
John:
I am the author of the QEX article and the designer of the Z90 and
Z91 digital panadapter.
Although these were designed as a general purpose panadapter, it
turns out that about 90% of my customers use it with a K2.
Consequently, I have modified the computer display software to
integrate with the K2 to permit mouse click tuning, i.e., click on
the spectrum display with the mouse and you can automatically tune
the K2 to that frequency. It's a pretty nifty feature and works
reasonably well.
The display height is 4.5 inches or so, and with the necessary
clearances, one needs an enclosure that is about 5 inches tall, and
preferably a hair taller.
I have one customer that installed (or he may still be in the
process of building it) the Z90 in a home made enclosure that is a
scaled up K2 enclosure.
Jack K8ZOA
www.cliftonlaboratories.com
John Wiener wrote:
I remember reading on this reflector that the spectrographic display
design (Pan-something) in a recent QEX article was designed with the
K2 in mind.
I was wondering whether anyone has considered this to be a worthy
occupant of an EC2 cabinet (the large one).
Has anyone homebrewed this device?
I think it comes as a kit but from what I recall from the article,
it seemed to be above my head as I am a pre-computer oldie/newbie or
whatever.
Sure would give Icom a run for the money to have a K2 with a
spectrum display.
Any thoughts?
John
AB8O
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft Help:
http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft Help:
http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
