++++++++++++++++++++++++++++++++++++++++++++++++++ Date: Wed, 28 Mar 2001 06:43:30 -0800 From: Phil Wheeler Subject: Re: [Elecraft] K1 band set up Bruce Grubbs wrote: > > Phil, > I have 40/20 and 30/17 and the KAT1. It's a little harder to switch filter > boards after the KAT1 is installed on top, but not much. Still only three > screws, but two now have long standoffs. It takes about 5 minutes, > certainly doable in the field. However, my inclination is to make the band > decision before the trip. I think the 40/20 will be in the rig most of the > time, but experience will tell... Hmmm .. I wonder if one could/should glue those standoffs to the KAT1 so that they are easy to work with on a repetitive basis. Or I guess one could procure some threaded ones and related hardware, and rig something that way. > > Of course, with the KAT1 concerns about dual band dipoles are moot. > Yes, a very good point, Bruce. Phil W7OX +++++++++++++++++++++++++++++++++++++++++++ Date: Wed, 28 Mar 2001 10:10:39 -0600 From: Mike Subject: Re: [Elecraft] K1 band set up John L. "Jake" Carter wrote: > Last month I completed my K1 (#384) for 40 and 20. I then ordered > a second filter board -- finished it today -- for 20 and 15. I have filter boards for 40/20 and 30/15. I considered getting yet another filter board for for 40/15, since that combo has some special advantages. I haven't yet. There is *one* small problem with having multiple filter boards that contain the same band, such as a 40/20 and a 40/15 board. The dial frequency calibration process for the 40/20 meter board will align the LCD frequency display for the 40m heterodyning crystal on the 40/20 board. That calibration constant will be stored on front panel board non-volatile memory, so that whenever you later tell the K1 that band 1 is 7 MHz, it will apply the correct calibration contant. If you have *other* filter boards that have 40 meters on them, they will use the calibration constant that was associated with the crystal on the *first* board. Unless the actual precise frequencies of the heterodyning crystals for 40m on both boards are identical, the LCD display for 40m will not be calibrated correctly after the boards are swapped. It's no big deal, of course, since it's a very simple matter to recalibrate the second board using a second receiver or such. But it is a effect that one needs to know about, and would be required for any board swap. In the field, one would need to know the "offset" between the two 40m boards, and just apply it mentally for the non-calibrated board. 73, Mike / KK5F +++++++++++++++++++++++++++++++++++++++++++++++ Date: Wed, 28 Mar 2001 10:27:18 -0600 From: Mike Subject: Re: [Elecraft] K1 band set up Phil Wheeler wrote: > Hmmm .. I wonder if one could/should glue those standoffs to the KAT1 > so that they are easy to work with on a repetitive basis. Or I guess > one could procure some threaded ones and related hardware, and rig > something that way. Phil, It was suggested recently on this list (my apologies to the suggester for drawing a temporary mental blank for his call) that short rubber strips cut from a *thin* rubber band can be inserted into the unthreaded standoff sleeve, and then the fastening screw can be "threaded" into the standoff so that the rubber firmly holds the screw and standoff together while allowing slip between them as the screw is tightened. I found this to work very well indeed. (Darn, I wish I could credit the fellow who suggested it.) Wayne pointed out that they choose the existing system, as opposed to male-female threaded standoffs, to make filter board changeout possible using only a screwdriver. A M/F threaded standoff would likely require a hex-nut tool to install, since there is little clearance between the standoff and the sides of the case. 73, Mike / KK5F +++++++++++++++++++++++++++++++++++++++++++++++++++++ Date: Wed, 28 Mar 2001 12:59:04 EST From: LHLOUSEK at aol.com Subject: Re: [Elecraft] K1 band set up That was Tom, N0SS. <<>> Luigi w7dzn +++++++++++++++++++++++++++++++++++++++++++++++++++ Date: Wed, 28 Mar 2001 13:52:21 -0600 From: Tom Hammond =?iso-8859-1?Q?N=D8SS?= Subject: Re: [Elecraft] K1 band set up If anyone is interested, the pictorial of this installation is available at: http://home.earthlink.net/~n0ss/kat1_standoff.pdf 73 to all, Tom Hammond N0SS +++++++++++++++++++++++++++++++++++++++++++++++++++++++ Date: Thu, 14 Feb 2002 20:22:44 -0600 Subject: Re: [Elecraft] Switching rf filter boards in K1 From: James Hall To: Randy Horn , Hi Randy: I too have just built the K1 (#1002) and it works great !! I made my first QSO with it yesterday. I have two 2-band filter boards - one for 20/40 and one for 15/17. You set up the other filter board just like you did the first one. Everything is saved and it's plug and play. BTW, 15 meters is a little problematic - I was finally able to coax 4.8 watts out after starting with 3.8 watts. Save one of your plastic bags and put the other filter board in it and just switch them out when you need to. Now on to the K2 !!! Beginning inventory now. Jamie WB4YDL > From: "Randy Horn" > Date: Thu, 14 Feb 2002 19:21:45 -0500 > To: elecraft at mailman.qth.net > Subject: [Elecraft] Switching rf filter boards in K1 > > Just built a K1 with 2 band filter board for 20 and 40. > The rig works great and exceeds my expectations, so now I wish I had built > the four band version. > Thinking about purchasing an additional 2 band filter board, but have a > question... > When you switch filter boards in the K1, do you have to reconfigure and > adjust the 1) band assignments and 2)the operating frequency calabration. > (How could this be done in the field?) > Tnx fer info, Randy AA1UN ++++++++++++++++++ Date: Mon, 19 May 2003 18:42:13 -0500 From: "Morrow, Michael A." To: Cc: Subject: [Elecraft] RE: K1 : Switching filter modules > I do have K1-4 with 40,30,20,15m. I thinking to add 80 and 17 > meter in a second filtermodule. What happens with the frequency > calibration when swapping modules? Will K1 remember calibration > from one module to another when they are swapped? Tom, I also have a 80/17m board in addition to a 40/30/20/15m board. The K1 MCU stores whatever calibration adjustment you've made for a particular band, regardless of whether or not a filter board with that band is actually installed. So you are completely correct in your assumption on how a filter board swap works. When you install and align the 80/17m board the first time, the K1 front panel MCU will store the calibration information for 80m and 17m after you have assigned b1 to 80m and b2 to 17m and performed the display calibration. When you later re-install the 40/30/20/15m board, and reassign b1 to 40m and b2 to 30m, the K1 will apply the stored calibration for 40m and 30m. When you later re-install the 80/17m board, the correct calibration will be made effective as soon as you assign b1 to 80m and b2 to 17m. Also, the K1 front panel MCU automatically detects whether a two-band or a four-band filter board is installed. 73, Mike / KK5F ++++++++++++++++