QEX article and K2
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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: [hidden email] 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 |
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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: [hidden email] > 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: [hidden email] 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 |
Re: QEX article and K2
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In reply to this post by John Wiener
I've got a Z90, and the kit's not very difficult. The display is too
big to fit into a EC-2 case. The width and depth are OK, but it's not high enough. So, I fabricated a K2-like case from aluminum sheet, using the little fastener blocks from Elecraft, and it looks good. It's just about 1 1/2 K2's high, and otherwise matches. I used the side of the case for the main regulator heatsink. I actually finished it in December before I went to VU7RG, but the weather was too bad to paint it then, and I've got one more little hack to add, that is, substituting a USB interface for the serial port. It's actually working, but I have a bit more metal work to do to mount the USB interface. Then I'll paint it, and put up some photographs. Jack has some images of the thing in bare aluminum. But that'll have to wait until May- I'm off on the N8S DXpedition tomorrow and wil be back just in time to go to Visalia. 73, doug From: John Wiener <[hidden email]> Date: Mon, 26 Mar 2007 13:34:59 -0400 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: [hidden email] 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 |
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In reply to this post by John Wiener
That's the Z90/Z91 Panadapter from Jack, K8ZOA. You can learn more about
it on his website, www.cliftonlaboratories.com You may be able to reconfigure the Z91 into a EC2 case (no display), but I don't see how you would do the Z90 (GLCD display). 73, Larry N8LP 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: [hidden email] > 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: [hidden email] 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 |
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In reply to this post by Jack Smith-6
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 <[hidden email]> 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: [hidden email] >> 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: [hidden email] > 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: [hidden email] 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 |
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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 > <[hidden email]> 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: [hidden email] >>> 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: [hidden email] >> 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: [hidden email] > 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: [hidden email] 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 |
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