[Elecraft] Let me build a K2 for you
I have built more than 170 K2's. Let me build one for you. My prices are reasonable and you receive a K2 ready to play. 73 Alan W1HYV ___ 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] Finished KPA100; problem HiCur and Hirefl
Dear all, I just finished my KPA100. I do have the following problem with the first steps connecting the KPA100 to my K2 #05618. I've connected the ribbon cable, speaker and RF connector to my K2. I've got audio and I also receive stations when I connect my antenna. With my dummy load and after setting power to 5Watts on 40M I see the 5 watts and the SWR for 1 second in the LCD screen and then the HiCur (High current) appears on the LCD.On 20m bands I only see the PWR in the LCD screen without the SWR for 1 second and than I see HiRefl. On 10M I do see the pwr and the SWR! The latter I only get 2.1 watts when set to 5 watts. Please can somebody tell me where to start? I did check the connections and this seems to be ok. There is no pwr to the KPA100 so everything is bypassed, except the bandfilters? help is very much appreciated!. -- 73, Koert PA1KW - HAMRADIO - when everything else fails! ___ 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: Elecraft Digest, Vol 35, Issue 32
Hi folks, as my K2(sn:4800) is probably sick I would like to ask for help. I found few days ago that on 20m (and maybe higher bands too) rx lost sensitivity. No sigs and even ATU tunning a lot and much more hard the same antenna. First time it lost sensitivity only partly then even more often and now for all the time. I remember that few days ago when pb started helped sometime to touch key when after dots comes sensitivity back. Now does not help anything. When I switch to 40m or lower it sounds all good... Thank You for tips to all, 73 Petr, OK1RP -- Petr Ourednik [EMAIL PROTECTED] -- http://ok1rp.blog.cz (Hamradio) http://topband.blog.cz (160m) http://www.qsl.net/ok1rp ___ 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] K2 Alignment Part I
Hi Folks, I have a strange behaviour with my K2 #6026 in the alignment and test procedure at page 43 of the manual. All went ok, untill after power up I tapped Display, the display said St L 040 and stayed in that menu, untill I tapped Menu, then everything was normal and stayed normal - untill next power up. I tried to reset the EEPROM, by powering up with 4+5+6 held, but this had no effect. It seems nothing is reset. All other tests went ok. I checked and rechecked soldering. If anyone has an idea, please. 73, Gerard PA1GP [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
[Elecraft] query on power readout
Hello there from VK, I am investigating severe loss of TX power on my K2. With 5W set, I get almost no power, the RF detector input measured with the RF probe/DMM shows 0.009V. however, the display reads approx. 5W out. The reading on pin 2 of U8 on control board is 0.55V. This would suggest to me that U8 is trying to deliver maximum power, which is what it ought to do if only 0.009V is seen at the detector. All detector components seem to be OK. What I don't understand is how the LCD is reading 5W on transmit. Other TX RF measurements (with SSB board still installed, rig set on CW mode) Q6 base = 0.021V Q6 collector = 0.88V Q7 base = 0.089V Q8 base = 0.108V (would have expected Q7 8 to be the same) Receive and menu functions all appear normal. Any ideas welcome, or advice as to where to look next. Chris K23666 Chris Meagher VK2LCD PO Box 61 Woodburn NSW 2472 Australia Nearest town: Evans Head HF Rig: Elecraft K2 ___ 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: DSP and CW? the Practical Solution?
My 2 cents... 1. Buy the DSP and try it. You can always sell it if you don't like it. 2. If you don't like a loop, try a noise-canceller. Since you are stuck with your sub 1/8 acre, this is a good option. Try http://www.mfjenterprises.com/products.php?prodid=MFJ-1026 I believe that if you buy direct, you get a 30 day trial period after which you can return it. Sounds worth it to me (at least in your case). 3. Remember, the more tools you have, the more likely that you'll find a solution to any given problem at any given time. Sometimes one will work better (best?) while other times something different (another tool) will do the job. 4. If you are nearly 100% cw, I hope you are using COMMUNICATIONS quality headphones (and I sure hope you are using headphones and not a speaker). You can try different headphones which are cheap. Remember, the worse the Freq response (such as for audiophile types), the cheaper it is, but the better it is for cw. Many decades ago, the BEST headphones I ever owned for cw was a $9 pair of Lafayettes. Horrible for listening to the stereo (mush) but great for cw. I almost cried when they fell apart after 15 years of daily service (not salvageable). 5. Don't forget to try wide bandwidths also...you never know. When I used to DX on 160 using my Kenwood TS940, my cascaded 500 cycle filters heard much worse on some signal than using no narrow filters at all (again, for cw). Weird, but I did what worked. Summary: Buy the DSP, if n/g, sell it Buy a noise canceller, if n/g, return it. Try a loop if you can figure out a practical way to turn it inside your house (hopefully, outside your shack). de Doug KR2Q ___ 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] headphone jack
I am now on my second headphone jack they dont seem to support the wieght of a plug and adaptor I read somewhere of a mod for replacing the normal jack but I can,t find it now. Can anyone help? Ken M0BPC ___ 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] query on power readout
Chris, When the K2 is attempting to deliver maximum power, Control Board U8 pin 2 will be near 5 volts. The 0.55 volts that you measure there indicates that it is controlling at a much lower power level. If you do not have either the KAT2, the KPA100, or the KAT100 installed, the K2 does not display the actual power output on the LCD (the requested power is displayed briefly when the power control is changed). What is the indication on the LED bargraph during transmit? From your RF voltage measurements, the voltage at the base and collector of Q6 appear to be about correct for about a 3 to 4 watt level, but the RF voltage at the bases of Q7 and Q8 is much lower than typical for that level. Check T2 as your first action. Be certain it is wound just like the illustration in the manual (particularly the dressing of the green wire), be certain the leads are well tinned and properly soldered, and that T2 is mounted off the board by 2 to 3 mm. Also check the soldering at the RF detector and its associated voltage divider resistors. The behavior of the K2 for power control is such that if it does not detect power output equal to the power detected on the VRFDET signal, then the microprocessor will attempt to increase power until the power is equal to the requested power. If that is not happening, then the detector driving the VRFDET line may have a problem, or the VPWR and VALC signals (control Board ALC components) may not be working properly, or the BFO injection to the transmit mixer (RF Board Q24 and its associated components) may not be working properly. 73, Don W3FPR chris meagher wrote: Hello there from VK, I am investigating severe loss of TX power on my K2. With 5W set, I get almost no power, the RF detector input measured with the RF probe/DMM shows 0.009V. however, the display reads approx. 5W out. The reading on pin 2 of U8 on control board is 0.55V. This would suggest to me that U8 is trying to deliver maximum power, which is what it ought to do if only 0.009V is seen at the detector. All detector components seem to be OK. What I don't understand is how the LCD is reading 5W on transmit. Other TX RF measurements (with SSB board still installed, rig set on CW mode) Q6 base = 0.021V Q6 collector = 0.88V Q7 base = 0.089V Q8 base = 0.108V (would have expected Q7 8 to be the same) Receive and menu functions all appear normal. Any ideas welcome, or advice as to where to look next. Chris K23666 Chris Meagher VK2LCD PO Box 61 Woodburn NSW 2472 Australia ___ 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: Sidetone not working
Gil, The most likely 'problem' is that you inadvertently toggled the sidetone source when you were doing something else in the menu. Proceed as follows: Enter the menu, select STL and hold EDIT to edit the parameter - first be certain the parameter is set at a level high enough to hear (020 should be good). Then tap the DISPLAY button to toggle the sidetone source. Stop when you hear the sidetone. If you still do not have sidetone after several attempts and you have a pre-3000 SN K2 that has been upgraded to change the sidetone source to U8-4, then you should check the wires added to the back of the Control Board. The proper wire placement is shown in the KPA100 and KIO2 manuals. 73, Don W3FPR Gil Gibbs wrote: Has anyone had the experience of getting most things going OK, then gotten disgusted when the sidetone wouldn't work? My PRE/ATTN option works OK, but when I push the same button for more than two seconds, I don't get the sidetone anymore. I was using it for a little paddle key code practice over two weeks ago, before the flu hit me, and now it's MIA! Any ideas, aside from replacing U2? That Front Panel board is a little complex to take apart regularly, and I'd like to use my K2 on the air someday. Thanks, 73's Gil WA5YKK ___ 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: Elecraft Digest, Vol 35, Issue 32
Petr, It sounds like the typical behavior when the receive antenna (RANT) is set on - the setting is available on a per band basis. Set the K2 to 20 meters, enter the menu and scroll to RANT. If the parameter is ON, press the EDIT button and change it to OFF. There is little else that can effect the receive sensitivity on a single band. 73, Don W3FPR Petr Ourednik wrote: Hi folks, as my K2(sn:4800) is probably sick I would like to ask for help. I found few days ago that on 20m (and maybe higher bands too) rx lost sensitivity. No sigs and even ATU tunning a lot and much more hard the same antenna. First time it lost sensitivity only partly then even more often and now for all the time. I remember that few days ago when pb started helped sometime to touch key when after dots comes sensitivity back. Now does not help anything. When I switch to 40m or lower it sounds all good... Thank You for tips to all, 73 Petr, OK1RP -- Petr Ourednik [EMAIL PROTECTED] -- http://ok1rp.blog.cz (Hamradio) http://topband.blog.cz (160m) http://www.qsl.net/ok1rp ___ 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] K2 Alignment Part I
Gerard, If you had ST L come up when you tapped the DISPLAY button, that is abnormal behavior, and is an indication that the pushbutton matrix is not being properly decoded. Check the soldering on the Front Panel Board carefully. Reflow the soldering with a hot soldering iron if necessary. A master reset is not likely to help. 73, Don W3FPR Gerard Provoost wrote: Hi Folks, I have a strange behaviour with my K2 #6026 in the alignment and test procedure at page 43 of the manual. All went ok, untill after power up I tapped Display, the display said St L 040 and stayed in that menu, untill I tapped Menu, then everything was normal and stayed normal - untill next power up. I tried to reset the EEPROM, by powering up with 4+5+6 held, but this had no effect. It seems nothing is reset. All other tests went ok. I checked and rechecked soldering. If anyone has an idea, please. 73, Gerard PA1GP [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 ___ 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] headphone jack
Ken, It is true that the headphone jack can be damaged by the torque imparted by the weight of an adapter plugged directly into the headphone jack. The easiest solution is to build an adapter cable - a miniature phone plug at one end and a 1/4 inch in-line phone jack at the other end. The heavy weight of the 1/4 inch phone plug can then rest on the table and there is not excessive torque on the headphone jack. If you need an 'already assembled' variety, purchase a headphone extension cable (one having miniature plugs and jacks) and use the adapter plug at the end of the extension cable. 73, Don W3FPR Ken wrote: I am now on my second headphone jack they dont seem to support the wieght of a plug and adaptor I read somewhere of a mod for replacing the normal jack but I can,t find it now. Can anyone help? Ken M0BPC ___ 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] Finished KPA100; problem HiCur and Hirefl
Koert, Make a quick continuity check first - from the center conductor of the J1 coax to the center of the SO239 antenna jack. There should be continuity on all bands (the ribbon cable should be connected for this test). Next, be certain R26 and R27 are set at their midpoint. If the problem persists, check T4 very carefully for correct lead positioning and properly tinned and soldered leads. Be certain the red wire goes through the center of T4 and the bare wire from the SO239 center connects to T4-6. 73, Don W3FPR Koert Wilmink wrote: Dear all, I just finished my KPA100. I do have the following problem with the first steps connecting the KPA100 to my K2 #05618. I've connected the ribbon cable, speaker and RF connector to my K2. I've got audio and I also receive stations when I connect my antenna. With my dummy load and after setting power to 5Watts on 40M I see the 5 watts and the SWR for 1 second in the LCD screen and then the HiCur (High current) appears on the LCD.On 20m bands I only see the PWR in the LCD screen without the SWR for 1 second and than I see HiRefl. On 10M I do see the pwr and the SWR! The latter I only get 2.1 watts when set to 5 watts. Please can somebody tell me where to start? I did check the connections and this seems to be ok. There is no pwr to the KPA100 so everything is bypassed, except the bandfilters? help is very much appreciated!. ___ 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] well-known RCVR tip (but wasn't well-known by me!)
I have been operating my K2 for just under a year now. In that time I ALWAYS have left the PRESELECTOR on and the RF Gain up all the way. I should have known better, but in case there is someone else in the group who has done likewise, here's a tip: Under high QRM or adjacent channel interference, don't be afraid to turn off PRESELECTOR or even use the ATTENUATOR. Both are extremely effective in bringing a sig up out of the noise...as is decreasing RF gain. I know most everyone knows this but it took me a year to try it so I thought I'd pass it along. It's just one more way to appreciate how the K2 sings...a truly great RCVR design. John AB8O ___ 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] EQP Submittal email address
Sorry about the missing link! We thought all the logs had been submitted. I guess we got ahead of ourselves ;-) Send your EQP logs to: [EMAIL PROTECTED] 73, Eric WA6HHQ -- _..._ ___ 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] K2- frequencies
Nick: Thanks for replies to my problem with filters - now sorted and I can hear the same signal on all filter settings! Got watts coming out the back but no QSOs - I find that the transmit freq is more than 1 KHz lower than receive (which is about 2 KHz lower than the digital display. Can't find anything on the site to help but yet again sure I am doing something stupid. Sounds as though there's still(!) an XFIL/BFO alignment problem. 1) Confirm that RIT (or XIT) has not been enabled. 2) What SIDETONE tone (ST P) have you selected? 3) Please send me the CAL FIL DAC (or frequency) values you now have for both CWN and CW REV. AND the values for the filter CENTER FREQ. (or DAC value) for each bandwith you've chosen. 4) On what band did you perform the CAL FIL operation? If you did it on on 15M or above, you MUST INVERT the 'sense' of the side- bands... e.g. CWN XFIL values will be ABOVE filter center instead of being BELOW, etc. 40M is probably the best band to use when performing CAL FIL. Cheers, 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
Re: [Elecraft] EQP Submittal email address
So Darwin was right! There was a missing link... but now you've discovered it ;-) 73, Larry N8LP Eric Swartz WA6HHQ - Elecraft wrote: Sorry about the missing link! We thought all the logs had been submitted. I guess we got ahead of ourselves ;-) Send your EQP logs to: [EMAIL PROTECTED] 73, Eric WA6HHQ ___ 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] DSP and CW?
Tom: Most certainly you CAN use the XFIL and DSP in tandem!!! Works nicely. 73, Tom HammondN0SS At 05:09 PM 3/29/2007, you wrote: That is actually what I meant. I am very happy with the crystal filters. I want the option of using them OR the DSP. I already know I like the crystal filters. But I expect to enjoy the DSP as well. Just want options. 73, Tom KG3V ___ 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] WTD:HEATHKIT VF-7401 2M Scanning Transceiver Manual
Guy's... Anyone on the list got a copy or original of the above manual that they could possibly either Scan for me, just send via e-mail, or want to sell..?? I will of course pay for any inconvienance and expenses... Just saw a seller on that auction site we all love and know well, and are curious as to workings, vintage etc Of the radio... All enquires on a postcard to the e-mail address below... Lets keep the list flowing and uncluttered TIA 73's Andy GM0NWI [EMAIL PROTECTED] -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 268.18.22/739 - Release Date: 29/03/2007 13:36 ___ 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] headphone jack
Hi Ken: I am now on my second headphone jack they dont seem to support the wieght of a plug and adaptor. I read somewhere of a mod for replacing the normal jack but I can,t find it now. Can anyone help? I saw that e-mail a while back, but I don't recall what was used. For what little it may be worth, I REFUSE to plug ANY 'adaptor' into any of the jacks of my rigs... PERIOD...! If some form of 'adaptation' is required to go from a larger to a smaller diameter connector (or the reverse), I will make a short (6 or so) CABLE with the requisite (adapting) connectors installed on each. Using size-to-size adaptors places a significant amount of stress upon the innards of connector jacks, especially the 3.5mm and 2.5mm styles, which will often cause them to break and/or fail. Using short adaptor CABLES, which reduce the amount of stress by 'remoting' the heavy connecting plugs (and thus the weight) has allowed me to retain all of the original jacks in my K2, and K1, since 1998. Just my personal opinion... YMMV. Cheers, Tom Hammond 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
Re: [Elecraft] DSP and CW?
Thanks for all the comments. I ordered a KDSP2 (and received notice that it has shipped) and expect to have it in my K2 in time for my birthday next weekend :-) The discussion also seems to have pushed me over the edge on finally investigating small loop antennas. The prospect of putting any sort of rotating antenna outside is still difficult with my shack arrangement (well, controlling an outside antenna from the inside, that is), but I can see myself doing some experiments out at the feed through... I'll report back. 73 de chris K6DBG P.S. Thanks for the reminder of using a wide Xfil and the filter between my ears. It definitely helps. ___ 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] Cabinet resonance
The combination of the cabinet and speaker of my K2 (#5665) has a VERY pronounced resonance at about 450 Hz. How fortunate, as this is the frequency at which I like to copy CW. (:-) The resonance is so pronounced that it would present a problem if I wanted to use a higher frequency, say 600 Hz. It initially caused me a bit of consternation as I was setting up the filters ... until I realized what was going on. Even with the filter set up for 600 Hz I would still find myself tuned and listening lower than the Spot tone ... sort of a human AFC circuit. (:-) Has anyone else noted this? I wonder if all the speakers supplied with K2's are of the same design from the same supplier? Mine -does- have all options installed except the battery and I assume the resonant frequency of the box would be different ... or non-existant ... with different fillers inside the case. I have two of the old Skytech variable-resonance speakers stored away that are fine examples of the application of housing / speaker resonance as a CW aid. They use a sliding tube to tune the assembly. 73! Ken Kopp - K0PP [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] Cabinet resonance
The K1 with the speaker does the same thing albeit at a higher frequency. A couple of extra screws dead center on the top cover on either side might cure that? What do people think? I use headphones most of the time, but the lid resonance is not the best thing when showing the rig off. Jozef WB2MIC Wells VT Ken Kopp wrote: The combination of the cabinet and speaker of my K2 (#5665) has a VERY pronounced resonance at about 450 Hz. How fortunate, as this is the frequency at which I like to copy CW. (:-) The resonance is so pronounced that it would present a problem if I wanted to use a higher frequency, say 600 Hz. It initially caused me a bit of consternation as I was setting up the filters ... until I realized what was going on. Even with the filter set up for 600 Hz I would still find myself tuned and listening lower than the Spot tone ... sort of a human AFC circuit. (:-) Has anyone else noted this? I wonder if all the speakers supplied with K2's are of the same design from the same supplier? Mine -does- have all options installed except the battery and I assume the resonant frequency of the box would be different ... or non-existant ... with different fillers inside the case. I have two of the old Skytech variable-resonance speakers stored away that are fine examples of the application of housing / speaker resonance as a CW aid. They use a sliding tube to tune the assembly. 73! Ken Kopp - K0PP [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 ___ 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] headphone jack
And, use a right-angle plug at the rig end. Abuse to the wire doesn't stree the rig nearly as much as the straight-in variety. Dan / WG4S / K2 #2456 on original jack too! snip If some form of 'adaptation' is required to go from a larger to a smaller diameter connector (or the reverse), I will make a short (6 or so) CABLE with the requisite (adapting) connectors installed on each. /snip ___ 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] KPA100 high output
Greetings Elecrafters, K2 #5945 with KPA100 has been very happy lately, working lots of good DX on the bands and teaching it's owner some new tricks :) Anyhow, when I first finished the KPA100 a month or two ago, I noticed some high output (like 140W) at times. It happens on 40M (well, that's the band I'm on usually), and I'll see my wattmeter all of a sudden start reading up around 140W. Bringing the power level doesn't have an effect until the rig *thinks* it's down quite a bit lower, like 80W or 70W, then it seems to correct itself and it's fine from there on out, with max power right around 100W for full-scale power settings. Originally, we thought it might be due to an oscillation, and I have replaced C31 (I think thats the one, I forget) with the new value to stop the oscillations, but I seem to remember Don saying that when there's an oscillation, the perceived SWR rises, and I don't think that's happening. So I'm wondering, perhaps I have a bug in the power sense section? Maybe a bad solder joint or something? The problem occurred numerous times the first weekend I had the KPA100 on the air, and hasn't happened since, until today. I was all excited that the problem had gone away, but I seem to have jinxed myself :) Any ideas, thoughts, or otherwise? Thanks, Jeff N6GQ ___ 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] KPA100 high output, again
Jeff, Yes, look for a solder problem in any of the circuits from the wattmeter sense (T4) area to the VRFDET output of the KPA100. Look at the schematic sheet 1 in the upper right corner (SWR BRIDGE) to identify the associated components. 73, Don W3FPR Jeff Kinzli N6GQ wrote: Greetings Elecrafters, K2 #5945 with KPA100 has been very happy lately, working lots of good DX on the bands and teaching it's owner some new tricks :) Anyhow, when I first finished the KPA100 a month or two ago, I noticed some high output (like 140W) at times. It happens on 40M (well, that's the band I'm on usually), and I'll see my wattmeter all of a sudden start reading up around 140W. Bringing the power level doesn't have an effect until the rig *thinks* it's down quite a bit lower, like 80W or 70W, then it seems to correct itself and it's fine from there on out, with max power right around 100W for full-scale power settings. Originally, we thought it might be due to an oscillation, and I have replaced C31 (I think thats the one, I forget) with the new value to stop the oscillations, but I seem to remember Don saying that when there's an oscillation, the perceived SWR rises, and I don't think that's happening. So I'm wondering, perhaps I have a bug in the power sense section? Maybe a bad solder joint or something? The problem occurred numerous times the first weekend I had the KPA100 on the air, and hasn't happened since, until today. I was all excited that the problem had gone away, but I seem to have jinxed myself :) Any ideas, thoughts, or otherwise? Thanks, Jeff N6GQ ___ 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] KPA100 build questions
I just bought a KPA100 that was originally purchased in 2002. It is unassembled. I ordered the firmware update, the KPA100UPKT and the shield upgrade. With this I should be able to build it up using the latest manual, yes? Would I not use the component values in the latest manual and go as if it was a recent amp? Mike AI4NS ___ 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
