Re: [Elecraft] K2 'CAL TPA' setting maxed out
When Windows updates it sometimes changes my KX3 settings. Not exactly something you would think of when trying to diagnose a problem with the radio. If your K2 is connected to Windows in any way, that might be the explanation. 73, david KC1DNY On 2/16/2024 11:58 PM, Jim KO5V wrote: Good Evening, As I was talking on 20M SSB tonight, my K2/100 started to get a bit twitchy when I transmitted. The power was set to just below 100W. I started seeing an intermittent 'High Current' error message, which then changed to a constant 'Hot PA' error. I have an intermittent RFI problem on 20M (which I thought I had solved), so that might have returned and caused this problem. I tried matching the antenna with the KAT100. It would not arrive at any solution - there were no relays clicking. I had to press the 'tune' button again to stop it. Toggling the power on the rig made no difference. So I searched the list's archives, and found a thread where Don mentioned the 'CAL TPA' menu. I found that it was at its maximum setting of 150C - I have set this parameter twice since building the radio 7 years ago. Resetting it to about room temp fixed the problem, and the radio now behaves normally. I also checked "CAL Cur", and it's still set to 3.50. So, it is working again, but why did the 'CAL TPA' setting go to it's max? Is there a known problem? Maybe it's a glitch from the RFI, but I thought I should ask just in case there is something else I should check. Thanks. 73, Jim KO5V Cedar Crest, NM __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to dhai...@bates.edu __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 'CAL TPA' setting maxed out
Hi Jim, I don't have an answer to your question, but will note that you are the 2nd person in the last month to report this issue. Thomas, WA8UNS also experienced repeated random resettings of the CAL TPA parameter to large values, often in excess of 200. He reset the parameter to the actual room temperature (in Celsius), things worked for a bit, then the PA Hot message reappeared. It's not clear yet if this random resetting occurs if the KPA100 module is bypassed by setting the POWER control to less than 10 watts. If you can replicate the issue on a dummy load, that would be of much interest. RFI in the shack is always problematic and can lead to weird issues. 73, Mike, K8CN __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] K2 'CAL TPA' setting maxed out
Good Evening, As I was talking on 20M SSB tonight, my K2/100 started to get a bit twitchy when I transmitted. The power was set to just below 100W. I started seeing an intermittent 'High Current' error message, which then changed to a constant 'Hot PA' error. I have an intermittent RFI problem on 20M (which I thought I had solved), so that might have returned and caused this problem. I tried matching the antenna with the KAT100. It would not arrive at any solution - there were no relays clicking. I had to press the 'tune' button again to stop it. Toggling the power on the rig made no difference. So I searched the list's archives, and found a thread where Don mentioned the 'CAL TPA' menu. I found that it was at its maximum setting of 150C - I have set this parameter twice since building the radio 7 years ago. Resetting it to about room temp fixed the problem, and the radio now behaves normally. I also checked "CAL Cur", and it's still set to 3.50. So, it is working again, but why did the 'CAL TPA' setting go to it's max? Is there a known problem? Maybe it's a glitch from the RFI, but I thought I should ask just in case there is something else I should check. Thanks. 73, Jim KO5V Cedar Crest, NM __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] [K2] CAL-PLL Question
Don and Dave, thanks for the responses. The idea with the ground contacts is interesting. Regardless of whether it makes a difference, I will check and clean the contact surfaces once the next time I open the base plate. I have not paid attention to this detail before. 73, Wolfgang DL2KI -- 73 de DL2KI http://www.dl2ki.de DOK K08 DL-QRP-AG #3247 G-QRPC #13541 AGCW # 3944 HSC #1970 GnuPG: Öffentlicher Schlüssel erzeugt am: 2012-10-27 Key-ID: 0xFB3F3B7A Algorithmus: RSA(4096 Bit) Fingerprint: 4530 9FCB 9D48 9B50 967C F81C 0EDB 78D9 FB3F 3B7A Anleitung - E-Mails verschlüsseln - Free Software Foundation https://emailselfdefense.fsf.org/de/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K2] CAL-PLL Question
The only reason I can think of why this might apply is if the grounding of the bottom cover was poor. Whilst it certainly can be poor, because of paint not having been properly masked around the mounting blocks, and I recommend cleaning all paint off, around them, I'd be surprised if enough of the induced currents, in the bottom panel, flowed through these points to make a difference. -- David Woolley Owner K2 06123 On 30/07/2022 16:25, Wolfgang wrote: in a german QRP forum I found this hint from Peter, DL2FI (SK). In any case, the PLL calibration must be redone whenever the bottom cover of the K2 has been opened. Therefore my question, of it is really so that "CAL-PLL" must be done again after *each opening* of the lower housing cover? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K2] CAL-PLL Question
Wolfgang, In my experience, that is not necessary. It IS necessary to have the bottom cover in place before running CAL PLL. 73, Don W3FPR On 7/30/2022 11:25 AM, Wolfgang wrote: Hi, in a german QRP forum I found this hint from Peter, DL2FI (SK). In any case, the PLL calibration must be redone whenever the bottom cover of the K2 has been opened. This statement does not correspond to the instructions in the K2 manual and other contributions here. Also, I can't understand the reason behind this statement. Therefore my question, of it is really so that "CAL-PLL" must be done again after *each opening* of the lower housing cover? Since Peter is SK, I can unfortunately no longer ask him myself. 73, Wolfgang DL2KI __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] [K2] CAL-PLL Question
Hi, in a german QRP forum I found this hint from Peter, DL2FI (SK). In any case, the PLL calibration must be redone whenever the bottom cover of the K2 has been opened. This statement does not correspond to the instructions in the K2 manual and other contributions here. Also, I can't understand the reason behind this statement. Therefore my question, of it is really so that "CAL-PLL" must be done again after *each opening* of the lower housing cover? Since Peter is SK, I can unfortunately no longer ask him myself. 73, Wolfgang DL2KI -- 73 de DL2KI http://www.dl2ki.de DOK K08 DL-QRP-AG #3247 G-QRPC #13541 AGCW # 3944 HSC #1970 GnuPG: Öffentlicher Schlüssel erzeugt am: 2012-10-27 Key-ID: 0xFB3F3B7A Algorithmus: RSA(4096 Bit) Fingerprint: 4530 9FCB 9D48 9B50 967C F81C 0EDB 78D9 FB3F 3B7A Anleitung - E-Mails verschlüsseln - Free Software Foundation https://emailselfdefense.fsf.org/de/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 CAL FCTR problem
Chris, Is the K2 CAL FCTR reading steady when you measure TP3 with the internal probe? If not, there is something wrong with either the internal probe or with Q9 and Q10 on the control board. Replace CB Q9 and Q10 with PN transistors and see if that corrects the reading. Once you have a steady reading, you can proceed - but not before. 73, Don W3FPR On 4/18/2019 6:42 PM, Chris wrote: Hi all, I have a K2/100 and a K2/10. I noticed that K2/100 is having an issue with the frequency calibration, so I decided to fix it today. When I set the band to 10m and connect my external GPSDO frequency counter and the FCTR probe to TP1. The internal counter keeps changing its frequency while the external counter shows stable reading, so it seems that the issue is actually with the internal FCTR. Also, I cannot match the external and internal reading by turning C22. It is way off. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K2 CAL FCTR problem
Hi all, I have a K2/100 and a K2/10. I noticed that K2/100 is having an issue with the frequency calibration, so I decided to fix it today. When I set the band to 10m and connect my external GPSDO frequency counter and the FCTR probe to TP1. The internal counter keeps changing its frequency while the external counter shows stable reading, so it seems that the issue is actually with the internal FCTR. Also, I cannot match the external and internal reading by turning C22. It is way off. Any idea? I was following the instruction from the link below; http://www.w3fpr.com/step_1.html Thanks, Chris AD1AD __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K2 CAL FIL and Filter shape measurements
Having Fun: A popular K2 CAL FIL method is using Spectrogram as documented here: http://www.elecraft.com/Apps/new_fil_docs/k2_ssb_gram.pdf Having an oscilloscope with a FFT math function, I wondered how it would do with a newly acquired Elecraft N-Gen. Results: I was able to perform the FIL adjustment though I would not call it easier than Spectrogram. I did find a method to fine tune CAL FIL by measuring two points on the filter curve and adjust for a correct center frequency. Take a look at the results and filter shape plots here: http://www.kn5l.net/K2-FIL/ John KN5L __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K2] CAL FIL Temperature Sensitivity Question
Fixed! A year of looking at solder joints, and flowing a few, did not fix the problem. I recently ordered and replaced L33 and the two BFO crystals. The three parts fixed the problem! Replaced L33 so that I did not need to worry about breaking the fine wires when removing the old one. John KN5L On 07/24/2013 10:59 AM, John Oppenheimer wrote: > My K2 has a 100 Hz difference in CAL FIL frequencies between cold and > full warm up. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K2] CAL FIL Temperature Sensitivity Question
Performed another test today, last night I aligned 200 Hz CW normal to 04913.08, First power up this afternoon 04913.21, after one hour warm up (no transmitting) 04913.10. John KN5L On 07/24/2013 12:39 PM, John Oppenheimer wrote: > Hi Don, > > My question is directed specifically at the CAL FIL BFO frequency being > 100 Hz different between cold and warm. As mentioned, because the BFO > frequency is off by 100 Hz, the 200 HZ filter is unusable because a > properly received pitch will place the signal on the filter skirt. > > This K2 serial number is above 7K > > The test is: Multi hour warm up, enter CAL FIL, measure and record a > filter BFO frequency. Next morning, cold start, perform same measurement > as above and compare the difference between the two BFO readings. > > John KN5L > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [K2] CAL FIL Temperature Sensitivity Question
Hi Don, My question is directed specifically at the CAL FIL BFO frequency being 100 Hz different between cold and warm. As mentioned, because the BFO frequency is off by 100 Hz, the 200 HZ filter is unusable because a properly received pitch will place the signal on the filter skirt. This K2 serial number is above 7K The test is: Multi hour warm up, enter CAL FIL, measure and record a filter BFO frequency. Next morning, cold start, perform same measurement as above and compare the difference between the two BFO readings. John KN5L __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [K2] CAL FIL Temperature Sensitivity Question
John, The specified stability for the K2 is less than a 100 Hz drift from a cold start at 25 degC, so your K2 is within the specification (granted it is just on the border). The drift will usually be worse for a K2 with the KPA100 installed than a basic K2 because there is more heat generated in the enclosure and less air volume present to disperse it in.. That is a 'cure' -- Is the serial number of your K2 less than 3446? That is when the PLL Temperature Stability change (Thermistor Mod) became available. If you have a K2 below SN 3000 that has been upgraded, than that mod was likely installed with the upgrade. Examine the K2 RF board toward the left side near the front - if there is a small board sitting vertically in the RP3 location, the mod has been installed. You may have to remove the KDSP2 option to see it. If your K2 does not have it, a kit to install that thermistor mod is available from Elecraft - PN E850138. If you do have that mod installed, the installation instructions for that mod have guidelines for advanced builders about altering the value of RA to achieve better drift compensation for your K2. You can download those instructions from http://www.elecraft.com/manual/PLL%20upgrade%20rev%20C.pdf. Note that the information about altering the RA value does not appear in the K2 manual, and is intended only for those advanced builders who have good capability for properly measuring the drift that results after changing RA. It may take some experimenting to find the right value for your K2.. 73, Don W3FPR On 7/24/2013 11:59 AM, John Oppenheimer wrote: My K2 has a 100 Hz difference in CAL FIL frequencies between cold and full warm up. The 100 Hz difference renders the 200 Hz BW unusable until the K2 warms up. Is this typical, or do I have a component with excessive temperature instability? John KN5L __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] [K2] CAL FIL Temperature Sensitivity Question
My K2 has a 100 Hz difference in CAL FIL frequencies between cold and full warm up. The 100 Hz difference renders the 200 Hz BW unusable until the K2 warms up. Is this typical, or do I have a component with excessive temperature instability? John KN5L __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K2 CAL PLL Error 232
Bill, It sounds like the 40 meter frequency is incorrect - the K2 detects that during a CAL PLL attempt. Do you have the K60XV installed or the rework eliminator for the K60XV option? If so, enter the secondary menu and once again set D19 = "y" - your master reset would have wiped out that setting. You will have to re-do all your filter settings - hopefully you wrote them down. 73, Don W3FPR Bill Strong wrote: > I reset the EEPROM on my K2 SN#4454 because it stopped responding to COM PORT > 1 commands from Ham Radio Deluxe. This cured this problem but now when I > turn the radio dial the frequency readout changes but the frequency is not > changing only on the 40 meter band. I am attempting to run CAL PLL but I > keep getting the 232 error code. I have tried 7100.00 and several > frequencies between 7000.00 and 7100.00. I have the frequency counter probe > connected to TP1. > > I would appreciate any suggestions. > > Thanks > Bill Strong > WA5KPE > > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.0.237 / Virus Database: 270.11.3/1971 - Release Date: 02/25/09 > 06:40:00 > > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K2 CAL PLL Error 232
I reset the EEPROM on my K2 SN#4454 because it stopped responding to COM PORT 1 commands from Ham Radio Deluxe. This cured this problem but now when I turn the radio dial the frequency readout changes but the frequency is not changing only on the 40 meter band. I am attempting to run CAL PLL but I keep getting the 232 error code. I have tried 7100.00 and several frequencies between 7000.00 and 7100.00. I have the frequency counter probe connected to TP1. I would appreciate any suggestions. Thanks Bill Strong WA5KPE -- View this message in context: http://n2.nabble.com/K2-CAL-PLL-Error-232-tp2386195p2386195.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K2 Cal Fil
I've just redone the freq cal using WWV & CAL PLL on my ol' K2 #1411. Getting ready to do CAL FIL for CW filters & then will do CAL FIL for SSB filters using my K2SB manual. However, looking at the latest K2 manual, I noticed that the CW settings for CAL FIL are different than my version of the K2 manual. I assume I should use the older version. Right? Lynn. - (from my BlackBerry) ___ 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:CAL S Hi Problem
Clark, The most likely reason is that your filters are currently not set correctly for single signal reception and allows the BFO to leak some signal into the IF passband. I suggest you wait until you have all bands working and after you have done an alignment of the BFO frequencies (and filter widths as you desire), then you can correct it if there is still a problem. For now, simply set CAL S Lo about 185 and CAL S Hi about 018. After you do the final filter alignment (using Spectrogram is best and easiest), then do a final pass on setting CAL S Lo and CAL S Hi. You may even want to wait until you have completed the KSB2 and installed it before setting CAL S Hi and CAL S Lo critically. 73, Don W3FPR Clark Macaulay wrote: Just finished Part 2 of my K2. All tests worked fine, but now I can't get the Cal S functions to work correctly. Cal S Lo works ok, but I can't get Cal S hi to turn off (yes, I have the RF gain fully CCW). When I leave Cal S Hi at the maximum value I can (display is 000, and the far fight segment is still lit, when going back to the normal display, the segment at S3 is now lit. Rotatating the RF gain does reduce the volume and move the segment up scale. ___ 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:CAL S Hi Problem
Just finished Part 2 of my K2. All tests worked fine, but now I can't get the Cal S functions to work correctly. Cal S Lo works ok, but I can't get Cal S hi to turn off (yes, I have the RF gain fully CCW). When I leave Cal S Hi at the maximum value I can (display is 000, and the far fight segment is still lit, when going back to the normal display, the segment at S3 is now lit. Rotatating the RF gain does reduce the volume and move the segment up scale. I'm sure this worked fine when testing the control/front panel boards by themselves, so I can't seem to find out what changed. Any ideas? 73 de Clark ke4rq ___ 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 Cal
Bob, I guess it is worth a try if you really want to do that. The BFO frequency must change to the other side of the IF. One reason I can see for changing USB to LSB is to change the pitch of the received signal note as you tune upward in frequency. With USB, the pitch decreases as you tune upward, and with LSB it increases. Whichever is better is a personal preference, and some folks don't really care. If you are one who does not care, then I suggest that you leave well enough alone. 73, Don W3FPR Bob P wrote: Saw a article in FISTS news letter about mods for a K1, Changing USB to LSB, Does any one have comments if this works and why do it ??. Mod is remove RFC1 and jumper it, then realign BFO Bob KC8IPQ ___ 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 Cal
Bob P wrote: Saw a article in FISTS news letter about mods for a K1, Changing USB to LSB, Does any one have comments if this works and why do it ??. Mod is remove RFC1 and jumper it, then realign BFO In the article I believe Harry explains his reason for doing this. First note that he is a JL3 so his band conditions I'm sure aren't the same as here in Texas. But for his usage he says the USB to LSB change allows him to "listen to phone QSO's on high-bands to know how propagations are good or not. And he can be active on his favorite 12-meter." -- GB & 73's KA5OAI Sam Morgan ___ 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 Cal
Saw a article in FISTS news letter about mods for a K1, Changing USB to LSB, Does any one have comments if this works and why do it ??. Mod is remove RFC1 and jumper it, then realign BFO Bob KC8IPQ ___ 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 Cal
Nick, I know you got many responses to your question about frequency calibration on the K2. I just wanted to give you my slant on this. When I calibrated my K2, I set up the K2 as a counter. On the tip of the counter jumper cable you built, wrap a little piece of bare wire around the banana plug and attach a clip lead to that wire. Plug the cable (along with wire and clip lead into your VCO output test jack on the RF board. Connect the other end of that clip lead to an external frequency counter. Note the frequency readout on the counter (the actual readout frequency is not critical) and adjust C22 on the Control Board so the K2's frequency counter's readout is exactly the same as the external counter. Your adjusting the time base on the controller board to match that of the external counter. Remove the clip lead and wire but leave the counter jumper wire connected to the VCO test jack. Put your K2 on the 7 MHZ band and Run VCO Cal. When the VCO Cal is completed, run the calibrations for your BFO offsets and if that external frequency counter was working correctly you will be dead on frequency. Hope this is not too confusing Nick. 73 Dave KD1NA ___ 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 CAL PLL
Hi David, >I'm looking for (links to or) a fuller explanation of what happens in this >process: number of points, interpolation, etc. To find out on your own, you could try this: 1. Get a stable CW signal source. 2. Get the spectrogram program. 3. Setup spectrogram for very high resolution. 4. Using CW mode, display the tone from the source in spectrogram. 5. Copy down the VFO setting and the tone frequency per spectrogram. 6. Change the K2 VFO setting by 10 Hz (don't change the signal). 7. Do steps 5 and 6 until the tone is at the edge of the CW filter bandwidth. 8a. Note the frequency per spectrogram 8b. Change the CW signal source frequency to get the same tone as in 4. 8c. Take the difference and write it down. 9. Do step 7(loop 5-6) and 8 until the signal is outside the RF filter bandwidth. 10. Plot the points as an X Y graph. This will look like a saw tooth. If you add back the differences recorded in step 8c you can fix up the curve to get a ramp and see each interpolation point. Step 8b causes an error that accumulates, but over any short range you can see how the K2 is setting the VFO. A better procedure could be done with an old fashioned crystal calibrator, but I think you'll get a feel for how the K2 works after looping through steps 5-8 a few times. 73 de Michael, AB9GV ___ 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 CAL PLL
Dave, Have you read the information in the "Circuit Details" section of the K2 manual? It contains a good description of the synthesized VCO operation in the RF board Sheet 1 section. That information coupled with a careful study of the schematic should give you the operation details that you request (the DAC sizes are indicated in the schematic, so you can extrapolate the step sizes from that info). I am not aware of any documents that elaborate further - the code in the firmware that drives all this 'magic' is Elecraft proprietary. 73, Don W3FPR - Original Message - Hi, all concerned: I get the operation of the hfo in general terms -- the PLL part, anyway. I'm looking for (links to or) a fuller explanation of what happens in this process: number of points, interpolation, etc. ___ 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 CAL PLL
Hi, all concerned: I get the operation of the hfo in general terms -- the PLL part, anyway. I'm looking for (links to or) a fuller explanation of what happens in this process: number of points, interpolation, etc. TIA & 73, Dave, N3HE ___ 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
