[Elecraft] Re: Homebrew Autotuner
On Sep 13, 2005, at 11:08 PM, Vic K2VCO wrote: I bet Wayne knows a good algorithm! Indeed I do. And it took several weeks of serious R & D and coding the first time we developed an ATU (KAT2). Among other things, the code uses four tuning phases, each with different granularities; time-based SWR target adjustment; hand-tuned, pseudo-grayscale switching of latching relays; SWR-based look-ahead tree pruning (borrowing extensively from game theory); scaled L-C stepping near local minima; and, when possible, L-C range prediction based on band information. It was a wonderful, hair-pulling, sleep-depriving, learning experience that I wouldn't deny anyone by giving away the details ;) 73, Wayne N6KR --- http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Homebrew Autotuner
Don wrote: I have found that it is not as easy as I had imagined. I have been using several methods to automatically find minimum swr and some work pretty well most of the time but none work well *all* of the time. The problem is that on some bands minimum swr occurs over a very narrow range of C and L. With either C or L are set only a little off of these optimum values any change in C or L will have *no* effect on measured swr. Some tuner algorithms use a phase detector as well as measuring VSWR. If you compare the phase of the current and voltage, the error signal from the phase detector will go through zero and change sign when you pass resonance. This tells you to reduce the step size and back up. I bet Wayne knows a good algorithm! Looking at the schematic of the KAT100 I only see a sensitive SWR detector. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Homebrew Autotuner
This may work out to be an optimization problem where you need to find the gradient of the LC surface and descend down that gradient. Imagine the SWR as the z axis of a basin. This basin is your attractor with the best SWR at the bottom of the basin. The x axis is your choice for L and the y axis is your choice of C in this tuner setup. The simplest method is to find the gradient by choosing a few points at random to begin to describe the character of the basin. Hopefully it is a simple basin with no false minima. There are ways of determining how to walk around them but that is a bit tougher than I want to explain right now. Since the function of this basin is not known a priori you will need to make the random choices I mentioned earlier. This can be used to perform piecewise differentiation to determine the gradient of the steepest path. Think of the gradient as the fall line a skier takes to go down the slope in the fastest manner. If you can determine the gradient you can adjust the L and C of your tuner in the direction indicated until you start to increase the SWR. At that point you simply back up to the one before and you're done. It is almost my bedtime so write me a note if you think you want to try this and I'll write out the mathematics of it in algorithmic form instead of my little thought experiment. It truly can solve your problem in a very short number of iterations. If you like you can determine the gradient at every step to achieve the optimal solution. This will take a little longer but your answer will be the best one you can get. Sincerely, Kevin Rock. On Tue, 13 Sep 2005 20:16:52 -0700, Don <[EMAIL PROTECTED]> wrote: A few months ago I maintained a brief correspondence with some on this list with an interest in a homebrew balanced autotuner. The project is nearing the point where I will be installing it into a K2 case. At the moment, though, I am having trouble coming up with a software algorithm that finds minimum swr and this message is a request for suggestions. I have found that it is not as easy as I had imagined. I have been using several methods to automatically find minimum swr and some work pretty well most of the time but none work well *all* of the time. The problem is that on some bands minimum swr occurs over a very narrow range of C and L. With either C or L are set only a little off of these optimum values any change in C or L will have *no* effect on measured swr. I have used complex algorithms that vary step size, vary C and L values intelligently with either positive or negative changes in value. I have used simple algorithms that stupidly go through an entire range of possibilities of all values of L for every C and so forth (ugh!) ... and have to believe there is someone out there in Elecraft-land a lot more clever than I who can suggest ways to intelligently find best combinations of L and C quickly using measured swr as the criteria. It really does not matter a great deal if I never perfect the autotuning feature of the tuner. It is easy to manually tune the tuner, store L and C for every band segment in nonvolatile memory, and then let the tuner automatically switch to the proper values when it senses the frequency at the input. But I can't call it an autotuner if it doesn't tune well automatically can I? Perfectionist that I am I would like to make it autotune like it is supposed to. Any ideas? Don K7FJ http://www.qsl.net/k7fj/ ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraftHelp: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Re: Homebrew Autotuner
Instead of an exhaustive search, you might try a genetic algorithm. 73, Steve AA4AK At 11:51 PM 9/13/2005 -0400, Mike WA8BXN wrote: Don - If you can easily tune the tuner by hand I always teach my programming students to just watch themselves manually performing the task, then write down a set of instructions so someone else could do that, and then write the program to follow those steps. Seems to me an exhaustive search trying all combinations has to find the lowest SWR, but that would take time. You could perhaps first run through your smart search method and if it gets close enough stop there, and if not, try all values. If you could get an approximation of the complex impedance of the load (not exactly sure how to do that offhand) you could then calculate what is approximately needed to best match it, and search around there. I will be interested in reading the ideas of others on this topic! 73/72 - Mike WA8BXN ---Original Message--- From: Don A few months ago I maintained a brief correspondence with some on this list with an interest in a homebrew balanced autotuner. The project is nearing the point where I will be installing it into a K2 case. At the moment, though, I am having trouble coming up with a software algorithm that finds minimum swr and this message is a request for suggestions. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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: Homebrew Autotuner
Don - If you can easily tune the tuner by hand I always teach my programming students to just watch themselves manually performing the task, then write down a set of instructions so someone else could do that, and then write the program to follow those steps. Seems to me an exhaustive search trying all combinations has to find the lowest SWR, but that would take time. You could perhaps first run through your smart search method and if it gets close enough stop there, and if not, try all values. If you could get an approximation of the complex impedance of the load (not exactly sure how to do that offhand) you could then calculate what is approximately needed to best match it, and search around there. I will be interested in reading the ideas of others on this topic! 73/72 - Mike WA8BXN ---Original Message--- From: Don A few months ago I maintained a brief correspondence with some on this list with an interest in a homebrew balanced autotuner. The project is nearing the point where I will be installing it into a K2 case. At the moment, though, I am having trouble coming up with a software algorithm that finds minimum swr and this message is a request for suggestions.
Homebrew Autotuner
A few months ago I maintained a brief correspondence with some on this list with an interest in a homebrew balanced autotuner. The project is nearing the point where I will be installing it into a K2 case. At the moment, though, I am having trouble coming up with a software algorithm that finds minimum swr and this message is a request for suggestions. I have found that it is not as easy as I had imagined. I have been using several methods to automatically find minimum swr and some work pretty well most of the time but none work well *all* of the time. The problem is that on some bands minimum swr occurs over a very narrow range of C and L. With either C or L are set only a little off of these optimum values any change in C or L will have *no* effect on measured swr. I have used complex algorithms that vary step size, vary C and L values intelligently with either positive or negative changes in value. I have used simple algorithms that stupidly go through an entire range of possibilities of all values of L for every C and so forth (ugh!) ... and have to believe there is someone out there in Elecraft-land a lot more clever than I who can suggest ways to intelligently find best combinations of L and C quickly using measured swr as the criteria. It really does not matter a great deal if I never perfect the autotuning feature of the tuner. It is easy to manually tune the tuner, store L and C for every band segment in nonvolatile memory, and then let the tuner automatically switch to the proper values when it senses the frequency at the input. But I can't call it an autotuner if it doesn't tune well automatically can I? Perfectionist that I am I would like to make it autotune like it is supposed to. Any ideas? Don K7FJ http://www.qsl.net/k7fj/
[Elecraft] Attn: QRP enthusiasts
John Shannon K3WWP is running a contest for a QRP "slogan". Over the past few months, John has solicited entries for the ideal QRP catchphrase that can be used in promoting this facet of Ham radio. Over fifty entries were submitted; and the list has been whittled down to 18 prospective slogans. Vote for your favorite at: http://home.alltel.net/johnshan/qrpslogan_vote.html Voting will be open until the end of September. You might remember a similar contest that John ran earlier in the year for CW. The winning entry was "CW: The original digital" submitted by KC5WA, Robert "RC" Conley. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] DOCs for the K1 LCD Backlight Mod
Hi Folks: Several folks have commented that it would be nice to be able to access a copy of the DOCs for the K1 LCD Backlight Mod before purchasing it. The manual is available for immediate download from the Elecraft web site. Just go to the web site and click on the "MANUALS & DOWNLOADS" link on the left side of the home page. Once there, scroll down to the "K1 And Accessories" section. The "K1 LCD Backlight Mod Kit" PDF link is at the bottom of this section. 73, Tom N0SS ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] OT: RE: I Love My K2 buttons on Ebay
Anyone wanting to be able to make those buttons in the 2.25" size, I have for sale, a complete button making system made by the Badge-A-Minit company. New this system would cost $479.85 plus shipping. It consists of their semi-automatic button press - ($299.95), their Electronic (read electric) "Cut-A-Circle" ($149.95) and their Button Builder-Pro button design software ($29.95). I'm moving up to a much more expensive automatic system, so am putting the one I use now on the block if anyone is interested. Button parts run about $25 per 100 with free shipping from Dr. Don's Buttons. This is a bit cheaper than you can get them from Badge-A-Minit. Entire system, shipped anywhere in the U.S. $285.00 (I'm going to put the money toward a new KX-1). Serious inquiries only, please reply off list. Jim Sheldon, W0EB [EMAIL PROTECTED] K2 #4338 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] An Opportunity for CW Ops
Here is web page, just watch the steps it is straight forward and most NCS like QMN, etc. will slow down and go at your speed... http://www.qsl.net/w8ihx/procedur.html - Original Message - From: "Jason Artz" <[EMAIL PROTECTED]> To: Sent: Tuesday, September 13, 2005 10:24 AM Subject: Re: [Elecraft] An Opportunity for CW Ops I had some health and welfare traffic I wanted to get onto NTS last week. I have never operated on a traffic net, and the instructions I found online for checking into a CW NTS net were complicated and I didn't feel confident about it. I e-mailed the traffic to another ham who was active on a voice NTS net and got the traffic in that way. My only rig is a K1 and I was looking forward to submitting some traffic via CW, but I'll need to practice net procedure/message formatting in advance. 73, Jason AK7V ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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: [Elecraft] XG2 Manual errors?
I didn't even notice the red/green LED, but I did notice the resistance check at C4 & R3 and forgot to report it. I came to the same conclusion that you did, the resistance check was wrong, so I just continued. The XG2 works fine. I compared with the XG1 and have the same output levels. The XG2 works fine On Mon, 12 Sep 2005 23:05:46 -0700, "John Webster" <[EMAIL PROTECTED]> wrote: >I picked up a new XG2 mini-module from the friendly folk at the Elecraft >booth at the South-Western Division ARRL Convention here in Riverside CA, >this weekend. I suppose I just need a building fix :-) > > > >Unless I am missing something, there seems to be a couple of errors in the >manual. I am only up to the second page, so I thought I would just check >with the group, before I ignore what I think are errors, and just press on >regardless. > > > >The manual that came with the kit is Rev. D, dated September 6, 2005. (The >on-line manual is still Rev. A, dated June 23, 2005, and is clearly an >earlier, less complete, version). > > > >1. In the introduction it states that "A power-on LED (green) is >provided . . ." In fact, the LED is red as is correctly noted in the Parts >Inventory at the bottom of the page. This is, of course, totally >inconsequential. >2. The fifth assembly step on page 2 calls for DMM resistance readings, >the last two of which just can't be right, if I understand the schematic at >all. It is stated that the junction of C4 and R3 is supposed to read 57-63 >k, but it simply reads open circuit. (Surely this is right?!, see schematic: >ONLY resis-ters have been soldered in at this point). The same applies to >the reading one is supposed to get at the junction of U1 and R1-57-63k. In >fact, this junction has no path to ground at this stage. Incorrect readings >at these check points could be rather disconcerting to a novice or >inexperienced builder. > > > >Comparing the XG1 manual with the XG2 manual suggests how this may have come >about: the latter manual was produced as a modification of the former one, >and some things slipped through that should not have. Is this right? > > > >Do I just keep going, or do I need my head read? > > > >Thanks and 73 > > > >John, N6JW > >K2/100 #3290 > >K1 #754 > >K1 #1642 > > > >P. S. The XG2 kit has fewer parts than the XG1 kit, but is $20 more >expensive. I imagine it must be the extra two crystals and 3 position >mini-rotary switch. As a point of interest, just what does it cost to get >fundamental frequency crystals like these made up, anyway? > > > >___ >Elecraft mailing list >Post to: Elecraft@mailman.qth.net >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: Elecraft@mailman.qth.net 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: [Elecraft] 33.25ft vertical with KXAT1 - Why did it work?
Martinm You can use the ATU menus to find out what value L and C and which network configuration NT1 or NT2 was in use by the KX1's ATU and you can see what the L network looks like in each case in the manual. See http://del.icio.us/tag/EFHWA for more links on end-fed half-wave antennas, from people who have field experience. Leigh / WA5ZNU On Mon, 12 Sep 2005 9:42 pm, Martin Gillen wrote: Hi. I started at 33.25ft vertical but I did leave a pair of 18.5ft counterpoise wires running at about 2 feet above the ground connected to the ground terminal. I tuned up and ... 1.2:1 match on 20m! I then proceeded to work KF6GC with 2W (almost 4000km) in the middle of a K Index = 8 solar storm! So I know the antenna worked well. I modelled it in EZNEC and the impedance at the base of that antenna should have been 970 + j 1700 ohms, so I am surprised that the KXAT1 was able to match it. Any comments? Was it because I left the counterpoises connected that it worked so well? If I remove the counterpoises in the NEC model the impedance increases and becomes inductive to 1456 - j 1819 ohms. Comments? PS. I am only learning in this stuff so forgive any overly simplistic analysis!! Thanks, Martin. VA3SIE. ___ To help you stay safe and secure online, we've developed the all new Yahoo! Security Centre. http://uk.security.yahoo.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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: [Elecraft] An Opportunity for CW Ops
Hi Jason and all Elecrafters, I've been watching the thread regarding CW traffic nets. My suggestion is to get a copy of the Net Directory from ARRL at your next hamfest or order one directly from Newington. It lists all nets, both traffic and casual nets, by frequency, function and scheduled times. Then just dial them up and listen to the proceedings. The directory also includes a good description of the NTS, net procedures and message format. There are any number of training nets (slow speed generally) as well as section and region nets. You will hear lots of short cuts on some of the nets while others follow a strict, military style. Some things you will hear may be confusing at first. For instance the net control may call two stations sequentially then tell them "U4 4RN2", which translated means up four kilohertz and pass two messages for the fourth region. You will also need copies of the ARRL numbered Radiograms and the listing of "Q" signals for net use. All of this info is included in the Net Directory as well as other ARRL publications like "the pink sheet", Operating An Amateur Radio Station, the ARRL Handbook, Public Service Communications as well as others. Listen a little and then jump in and get your feet wet when you feel a little more comfortable. You will be more than welcome, believe me. Pat Haynes, K4BEH ORS, EC Building K2 #5061 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K60XV
That's kind of what I figured. It just seemed kind of coincidental that, when I turned on the rig this morning, the noise level was zero, and the sigs were really faint. Kind of scares ya, you know what I mean?? Noise levels are back up since the sun came up. I'll have to see what the sigs are like this evening/tonight on 75, if any. Thanks Steve, Stan Rife W5EWA Houston, TX K2 S/N 4216 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Stephen W. Kercel Sent: Tuesday, September 13, 2005 8:46 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K60XV Stan: We've been having history-making solar flares for nearly a week. The HF bands have been completely dead more often or not. 73, Steve AA4AK At 08:05 AM 9/13/2005 -0500, Stan Rife wrote: > I just completed and installed a K60XV in my K2 last evening. I am >not sure if it is propagation, or if my overall gain seems to be down on 75, >60 & 40. Power output is right up there where it was before the addition, so >I assume (?), maybe incorrectly, that the filters are tuned ok. 60 meters >tuned up fine and I get 100w in to a dummy load. > Any ideas, or are the low bands just dead right now??? > >Stan Rife >W5EWA >Houston, TX >K2 S/N 4216 > > >___ >Elecraft mailing list >Post to: Elecraft@mailman.qth.net >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: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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: [Elecraft] An Opportunity for CW Ops
I had some health and welfare traffic I wanted to get onto NTS last week. I have never operated on a traffic net, and the instructions I found online for checking into a CW NTS net were complicated and I didn't feel confident about it. I e-mailed the traffic to another ham who was active on a voice NTS net and got the traffic in that way. My only rig is a K1 and I was looking forward to submitting some traffic via CW, but I'll need to practice net procedure/message formatting in advance. 73, Jason AK7V ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K60XV
Stan: We've been having history-making solar flares for nearly a week. The HF bands have been completely dead more often or not. 73, Steve AA4AK At 08:05 AM 9/13/2005 -0500, Stan Rife wrote: I just completed and installed a K60XV in my K2 last evening. I am not sure if it is propagation, or if my overall gain seems to be down on 75, 60 & 40. Power output is right up there where it was before the addition, so I assume (?), maybe incorrectly, that the filters are tuned ok. 60 meters tuned up fine and I get 100w in to a dummy load. Any ideas, or are the low bands just dead right now??? Stan Rife W5EWA Houston, TX K2 S/N 4216 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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] K60XV
I just completed and installed a K60XV in my K2 last evening. I am not sure if it is propagation, or if my overall gain seems to be down on 75, 60 & 40. Power output is right up there where it was before the addition, so I assume (?), maybe incorrectly, that the filters are tuned ok. 60 meters tuned up fine and I get 100w in to a dummy load. Any ideas, or are the low bands just dead right now??? Stan Rife W5EWA Houston, TX K2 S/N 4216 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] For Sale K2
Loaded with goodies professionally done. KK7UQ interface for PSK.Cables included. Give me a reasonable offer and I'll pack and ship to your requirments. 73 Earl W7TK ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Detaching the K2 Faceplate
> I was wondering if anyone has ever detached the faceplate of a K2? I've been wanting to try this, and I think a 40 conductor IDE disk drive cable would be a good starting point -- they should be readily available, and connectors at each end that should be compatible with the "face" and "chassis" sides of the K2 with only slight modification. You'd need a male-male header at one end since the cables have two female ends. Since the K2 uses only 20 pins between the chassis and face, you could use every other conductor on the cable as a ground for shielding. The IDE cable has two rows of 20 pins -- one row would connect to the existing K2 signals between face/chassis, while the other row of 20 could be connected to ground, and if I remember the cable layout correctly, one of these would conveniently fall adjacent to each signal pin on the cable. Might be best to get a good length of cable (rather than 1-2 feet from a standard IDE cable) and the correct gender headers from digikey/etc. after experimenting with a standard IDE cable. --Andrew, NV1B ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] Re: An Opportunity for CW Ops K2 use in emergencies
Johnny, My wife's rig is a k2/100 with most or all internal accessories and kat100. She has been quite active in health and welfare traffic handling for Katrina and has been involved on a regular basis with traffic nets since shortly after upgrading to general class. She is just starting to learn CW traffic handling now but is already quite proficient at ssb traffic handling and net control functions. Her K2 has worked admirably for her use on a daily basis for this. It is an excellent rig and is nice, small and powerful. She has it mounted in a portable wood box along with a power supply and a 2m rig. On her desk, she keeps 2 12V 7.5 AH lead acid batteries on a trickle charger and can switch to backup power with a single switch on the front panel of the box. The wood box has antenna cables, ground strap, a battery cable plug (anderson connectors like the k2/100 upgrade), and the power supply ac plug coming out of the back. it takes only a minute or two to disconnect and carry to the car. Additionally, she has a 50 watt solar panel and deep discharge marine battery (about 100 Ah ??) available for long term use without commercial power. This system appears to be able to keep the battery charged on sunny days even with rather heavy use. While she has a small portable vertical 40-10 screwdriver, we tend to prefer setting up either a loop or dipole at 15 ft or below for portable use. These are 80-10 meter antennas that run NVIS on 80 and 40m capable of blanketing the state of TX and beyond with usable signals during just about anything but the poorest of conditions. So in a nutshell. The k2 is capable of being one of the best sort of emergency radios possible for HF. I don't think it is used substantially only because I believe that there are relatively few K2s out there compared to a multitude of other brands and radios from current and previous eras. Also, being a kit or built by an individual, tends to be a disadvantage when considered for purchase by an entity associated with emergency operations. best regards, Charles wb5izd > > > > -- > > Message: 26 > Date: Tue, 13 Sep 2005 10:10:59 +0800 > From: "Johnny" <[EMAIL PROTECTED]> > Subject: Re: [Elecraft] An Opportunity for CW Ops > To: "Ron D'Eau Claire" <[EMAIL PROTECTED]>, > > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; format=flowed; charset="iso-8859-1"; > reply-type=original > > Hi Group, > > I have read so many message about emergency net in US. I am interested in > knowing whether K2 has been greatly used in emergency communication. Can I > have your advice? > > 73 > > Johnny Siu VR2XMC > builder of s/n 1146, 4225, 4165 ... ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
Fw: [Elecraft] Re: CW in Emergencies
I guess Eric didn't get this message sent directly to him the first time with specifics examples concerning CW during Katrina that we are aware of here. best regards, Charles Allison wb5izd - Original Message - From: "charles allison" <[EMAIL PROTECTED]> To: "EricJ" <[EMAIL PROTECTED]> Sent: Wednesday, September 07, 2005 8:25 AM Subject: Re: [Elecraft] Re: CW in Emergencies? (WAS: Dropping the Code Test) > > ka5klu sent 10 to 20 h&w msgs per night into MS starting monday night > Don, ac5xk, did some msgs on monday night via cw also. These are the only > ones I know of because my wife is involved in the h&w networks and these are > the only ones she was interfacing with that were doing cw into the area - at > least that she told me about. > > As for cnn, are you sure they were really there? The media has been known > to fake things in the past as well as regularly distorting what they report. > In any case, I've never seen a media team doing emergency or h&w traffic > message handling, except as an occaisional diversion for the tv camera to > record. > > As for bpl, it's an abuse of existing technology that provides inferior > results compared to alternatives and causes harmful interference to a lot > more than just amateur radio. Just wait til it comes out that it's possible > to decode the data going through remotely and that some geek is selling > decoding systems on the gray market so that crooks as well as the fbi can > monitor what people are doing on it. note that such things have been done > by intellegence services all the way back to monitoring emitted noise from > the old telex machines. > > > - Original Message - > From: "EricJ" <[EMAIL PROTECTED]> > To: "'charles allison'" <[EMAIL PROTECTED]>; > Sent: Tuesday, September 06, 2005 2:55 PM > Subject: RE: [Elecraft] Re: CW in Emergencies? (WAS: Dropping the Code Test) > > > > WHOA! Back up the bus, there, Charles. I'd like a citation for that one! I > > have been searching google (a major investor in BPL) diligently and have > not > > seen a single reference to CW in this disaster. Not one. > > > > Actually, Craig fingered the reality. The FIRST communications out of the > > affected area were via CNN and the major networks who had pre-staged > cameras > > and crews in the area. > > > > We're living a myth. All of us. Hams, ham clubs, the ARRL. We're going to > > get blind-sided. That quote in the WSJ from a BPL rep saying "amateurs > were > > nothing", is a WARNING. With all the billions of dollars behind BPL, and > > hams defending their existence with fairy tales, we are ripe for an attack > > from powerful, moneyed interests and they will eat our lunch. > > > > > > Eric > > KE6US > > www.ke6us.com > > > > > > -Original Message- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of charles allison > > Sent: Tuesday, September 06, 2005 9:17 AM > > To: elecraft@mailman.qth.net > > Subject: [Elecraft] Re: CW in Emergencies? (WAS: Dropping the Code Test) > > > > > > The first communications with the affected area from the outside were HF > CW. > ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Detaching the K2 Faceplate
James Kern wrote: Check in the Elecraft photo archives on Elecraft's website. Someone detached the front faceplate (as well as some other things) to make the K2 bicycle mobile. Perhaps you can get in contact with that person and get some tips. Good luck! also see http://www.qsl.net/n8mx/bike.html -- -/___. _)Margaret Stephanie Leber CCP, SCJP/"The art of progress / /(, /| /| http://voicenet.com/~maggie SCWCD/ is to preserve order/ ---/ / | / | _ _ _` _ AOPA 925383/ amid change and to / --/ ) / |/ |_(_(_(_/_(_/__(__(/_ K3XS / preserve change amid/ -/ (_/ '.-/ .-/ARRL 39280 /order."-A.N.Whitehead/ /(_/_(_/___AMSAT 32844_/<[EMAIL PROTECTED]>/ ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Emergency Nets (was: Dropping the Code Test)
Craig, You ARE on the wrong frequencies, listen on 40 by day and 80 by night to Gulf Coast nets. Stuart K5KVH ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Antenna Static Bleeder?
Resistors are fine. Our club uses 2 each 100K ohm, one for each side of the ladder line to earth tent stake. Each resistor is carbon 2w. Stuart K5KVH ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
