[Elecraft] [K2 processor noise]
Hello there During the first hours of operation on my K2 sn 7063, I noticed that, when attempting to copy a weak signal, with AFIL 1 on and maximum AF gain, I hear processor noise. After that, I realized it is everytime I have AF gain in the vicinity of maximum. I hear it, during reception and during my keying as well. I know its processing noise because it changes when I push a button or turn a knob. (I have KSB2, KNB and KAF2 instaled.)Any ideas how I can troubleshoot? dePP5RLC - Vagner __ 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] XV432 Oscillates with Amp connected
Stu A couple of thoughts. You didn't mention if the oscillation was occurring with the amp driving an antenna or a dummy load. The Elecraft transverters have lots of nice features but they are quite poorly shielded. If you were using an antenna you might be getting an RF feedback loop via the various rear-panel connectors which rely on the PC board for grounding rather than the case. Clip on ferrite beads on the cables can help. If you were running the amp into a dummy load then the problem is more likely impedance related as you suggested. When I built my XV222 the manual failed to suggest that the paint be scraped off the case where the output coax connector is attached. If you haven't already done this, it might be worth a try just to ensure proper grounding. 73, Steve VE3SMA __ 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] XV432 Oscillates with Amp connected
On 5/9/2011 6:32 AM, Steve Kavanagh wrote: Stu A couple of thoughts. You didn't mention if the oscillation was occurring with the amp driving an antenna or a dummy load. The Elecraft transverters have lots of nice features but they are quite poorly shielded. If you were using an antenna you might be getting an RF feedback loop via the various rear-panel connectors which rely on the PC board for grounding rather than the case. Clip on ferrite beads on the cables can help. If you were running the amp into a dummy load then the problem is more likely impedance related as you suggested. When I built my XV222 the manual failed to suggest that the paint be scraped off the case where the output coax connector is attached. If you haven't already done this, it might be worth a try just to ensure proper grounding. *Likewise, try scraping paint off the four 2-D attachment points on both the side panels. The paint is very tough and hard to remove but its worth the work. --Lenny W2BVH* 73, Steve VE3SMA __ 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
[Elecraft] K3 vs RigExperts SWR meter issue
Hello: I just bought an AA-54 RigExperts analyzer. I am tuning a Buddipole which I use with my K3 (25+ countries and counting). The RigExpert says my SWR is 1:2.5 at 14.200Mhz. I also scan the SWR curve with it and I see that I am 1:3 or lower a couple of 100hz around the 14.200 center frequency. I hook my feedline up to my K3, put the KAT3 on bypass, set VFOA to 14.205Mhz and ask if the frequency is in use. I immediately see HI SWR on it. I can definitely use the KAT3 to tune out any reactance and my SWR/RF look reasonable (I hit 100on the RF Scale and the SWR meter doesn't go above 2). What am I missing here? I am trying to compare the SWR meter on the K3 against what the RigExperts claims as a learning exercise (1.5 month old ham here). 73 -aps __ 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] XV432 Oscillates with Amp connected
First off let me state that I do not have any of the equipment Stu is using. The fact the XV432 likes the 50-ohm termination (dummy load to the rest of us), says it looks like a termination loading issue. The Henry 2004 should offer a 50-ohm load at input. Some amps require input tuning (my 2m-8877 is very touchy on input tuning and does not present a low SWR; best I get is 1.7:1). My amp is HB so I know why. Transmitting into open unterminated coax will normally show standing wave peaks and valleys. But perhaps the XV432 is going into self-oscillation when not seeing a good load? If you have enough excess power I would suggest using a 3-dB attenuator between the XV432 and Henry amp. It will have to be rated for full power of the XV432. Many amps even have an internal attenuator on the input (mainly to broadband input tuning). Do you have another 432 transmitter to test with the Henry amp? Also, try different lengths of coax between the XV432 and the amp. Oh, and test those coax lines with the 50-ohm termination on the far end (should see no oscillation or SWR). If the XV432 is going into self-oscillation it might be RF feedback from the Henry amp thru power lines? Try moving the XV432 dc cables to see if that causes any effect. If so wrapping the dc cord thru a toroid core may help (also check that there is RF bypassing inside the XV432 on the dc input. Should see a bypass cap and maybe ferriite beads on the dc line. Check station grounding. That Henry needs a good RF and safety ground to an external ground post and house wiring ground (this has been a recent topic). Have you tested with the Henry into a 50-ohm termination (dummy load)? High SWR on the antenna can also produce these effects with a high-power amp. (of course no all of us have a QRO dummy load) I have a 500w Sierra Electronics air cooled load that will sustain up to 1000w for quick checks (no sustained key-down). At 1500w, I usually use my 2m eme array as best load (on a clear freq.). GL, Ed - KL7UW -- Message: 2 Date: Sun, 08 May 2011 13:34:55 -0400 From: Stu2 s...@stu2.net Subject: [Elecraft] XV432 Oscillates with Amp connected To: elecraft@mailman.qth.net Message-ID: 4dc6d43f.2090...@stu2.net Content-Type: text/plain; charset=ISO-8859-1; format=flowed Good day, I'm working with the XV432, Flex 1500 and Henry 2004A Amp. The rig, xvrtr and amp PTTs are sequenced. Hoping somebody might have been down this path before and has a solution. If I connect the transverter output to the amp (or different pieces of open coax) and key the transverter, the power meter goes full scale and I see an oscillation on the spectrum analyzer. The frequency of the oscillation varies with the load. (i.e. amp connected or different lengths of coax) If I connect the XV432 to a 50 ohm load, no oscillations and all works well. I ran through the alignment procedure again with the XV432 connected to a 50 Ohm load. All the voltages look right and the tuning is smooth. (e.g. 20mV Quiescent Current Adjustment, TP3/TP4) It's obvious the XV432 is happy into 50 Ohms, but not into impedances that wander from 50 Ohms. BTW, I have added all the mods as per the Elecraft website. Any ideas? 73's Stu2 W7IY 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 50-1.1kW?, 144-1.4kw, 432-100w, 1296-testing*, 3400-? DUBUS Magazine USA Rep dubus...@hotmail.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] KPA500
I'm so excited. Tracking shows my 500 will arrive in 2 days. YEH! Phil Philip LaMarche LaMarche Enterprises, Inc mailto:p...@lamarcheenterprises.com p...@lamarcheenterprises.com http://www.LaMarcheEnterprises.com www.LaMarcheEnterprises.com 727-944-3226 727-937-8834 Fax 727-510-5038 Cell http://www.w9dvm.com www.w9dvm.com K3 #1605 CCA 98-00827 CRA 1701 W9DVM __ 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] AA Engineering Charger + KBT2
Brian, The consideration over the bulk charge rate is still valid - if the charger goes into bulk charge state the voltage is higher - AND, if the receive current is much lower than the bulk charge current, the battery can be over-charged. To prevent that condition, the bulk charge rate should be lower than the receive current (it does not have to be matched to the receive current - just lower). What will happen is that part of the receive current will come from the charger and some from the battery - all is well as long as your operating times are only for a few hours, the battery will provide plenty of juice. The switchable Smartcharger is a real help here, but I would suggest using 1 amp for the higher current rate - provided you resolve to leave it at the low current rate until your operating session exceeds 2 or 3 hours, and at that time, switch the charger to the 1 amp rate. If you cannot make that resolution, then I would suggest your proposed 250/500 ma combination would be better. 73, Don W3FPR On 5/8/2011 8:02 PM, Brian - N5BCN wrote: Hi all, AA Engineering's QRP Smart Charger has the option to be built using two of the four charging rates: 0.250 A, 0.500 A, 0.750 A, and 1.00 A. I plan to run my K2 using a KBT2 + Charger combo. Which two charging rates would be suit this setup? My K2 has a number of options and draws about 380 mA right now on receive, considerably more when the remoted KPA100 goes into high power mode (remoted KPA100 obviously runs on a different power source). I've read W3FPR's Smart Charger Mod and he's using 250 mA, so I'm leaning towards the 250 mA/500 mA combo, however, I don't think his mod is used in conjunction with a remoted KPA100. 73 N5BCN - Brian - K2 #6800 KPA100/KAT100-2, KSB2, KAT2, KIO2, K160RX, KNB2, KAF2, LP-PAN/K2 w/ Pre-amp, SignaLink USB -- View this message in context: http://elecraft.365791.n2.nabble.com/A-A-Engineering-Charger-KBT2-tp6342835p6342835.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 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] K3 mod by N0SS
I took my K3 down to fit a 2nd rx and was reminded of a post by N0SS about the different way of releasing the rear top corner of the right side panel. As a reminder, the threaded D-2 block has a threaded pillar attached to it by a single screw, making it inadvisable to remove the screw at rear top; instead, a screw holding the KAT3 PCB to the threaded pillar is removed, requiring the use of a screwdriver held at an angle to unscrew and re-drive a screw. Tom, N0SS, came up with a very simple mod to enable the panel screw to be removed, just like the rest of the case screws. I drilled the D-2 threaded fastener's screwhole to 7/64 , which was just sufficient to remove the threads. Afterwards, the pillar can remain connected to the KAT3's PCB and the longer than normal countersunk screw at the right top corner passes through the D-2 and screws into the threaded pillar. This mod makes it unnecessary to remember the different takedown requirement for that single location. Neat! Thanks, Tom. A nice little tweaklet. 73 Dave G3TJP __ 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] K3 vs RigExperts SWR meter issue
Hi Alexander, I see this a lot with my K3. The truth is that the KAT3 is never really out of circuit. The trick is to enable the KAT3 (Hold ATU Tune), use it to show a low VSWR to the rigs finals, then disable it (Hold ATU TUNE) again. You will then find that the VSWR will presented to the rig will be correct as per the analyser. I don't why the KAT3 still appears to be in circuit when supposedly switched out but at least there is a workaround. 73 de Jeff Cochrane - VK4BOF Innisfail, QLD, Australia Elecraft K3 #4257 + KPA500 + PR6 + K144XV = Multiband greatness! - Original Message - From: Alexander Sack To: elecraft@mailman.qth.net Sent: Tuesday, May 10, 2011 1:51 AM Subject: [Elecraft] K3 vs RigExperts SWR meter issue Hello: I just bought an AA-54 RigExperts analyzer. I am tuning a Buddipole which I use with my K3 (25+ countries and counting). The RigExpert says my SWR is 1:2.5 at 14.200Mhz. I also scan the SWR curve with it and I see that I am 1:3 or lower a couple of 100hz around the 14.200 center frequency. I hook my feedline up to my K3, put the KAT3 on bypass, set VFOA to 14.205Mhz and ask if the frequency is in use. I immediately see HI SWR on it. I can definitely use the KAT3 to tune out any reactance and my SWR/RF look reasonable (I hit 100on the RF Scale and the SWR meter doesn't go above 2). What am I missing here? I am trying to compare the SWR meter on the K3 against what the RigExperts claims as a learning exercise (1.5 month old ham here). 73 -aps __ 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] XV432 Oscillates with Amp connected
Hello Stu2, Some time ago, I had problems with an oscillating (or at the tip of starting self-oscillation) XV432. It manifested in such a way, the XV432 being very sensitive to input power levels and jumpy output power when adjusting the power level. Together with a Mirage D1010 (100W 70cm PA) sometimes oscillation at full power has been observed. In my case I could track it down to 70cm HF being coupled back into the IF (TX IF towards the XV432) causing a feedback. I could eliminate the oscillation by 2 modifications: 1) Added both the Elecraft Erratas to eliminate oscillation on the PA hybrid module (one is about installing a coil and a second one about installing a series resistor). Note that the errata to install the series resistor seems to superseede the coil, in my case installing both of the modifications did improve stability. 2) Install a small low-pass filter in the TX IF input in the XV432, as described here: www.dl7maj.de/XV432-Mod.pdf I installed the filter on board of the XV432, as shown in the PDF above. Note that I drive my XV432 from a K3 with 0dBm power. With the above modifications no oscillation or instability in output power has been seen anymore. I hope this may help. Best 73 de Thomas, HB9XAR Stu2 wrote: Good day, I'm working with the XV432, Flex 1500 and Henry 2004A Amp. The rig, xvrtr and amp PTTs are sequenced. Hoping somebody might have been down this path before and has a solution. If I connect the transverter output to the amp (or different pieces of open coax) and key the transverter, the power meter goes full scale and I see an oscillation on the spectrum analyzer. The frequency of the oscillation varies with the load. (i.e. amp connected or different lengths of coax) If I connect the XV432 to a 50 ohm load, no oscillations and all works well. I ran through the alignment procedure again with the XV432 connected to a 50 Ohm load. All the voltages look right and the tuning is smooth. (e.g. 20mV Quiescent Current Adjustment, TP3/TP4) It's obvious the XV432 is happy into 50 Ohms, but not into impedances that wander from 50 Ohms. BTW, I have added all the mods as per the Elecraft website. Any ideas? 73's Stu2 W7IY __ 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] K3 vs RigExperts SWR meter issue
On Mon, May 9, 2011 at 6:03 PM, Jeff Cochrane - VK4BOF vk4bof.elecr...@gmail.com wrote: Hi Alexander, I see this a lot with my K3. The truth is that the KAT3 is never really out of circuit. The trick is to enable the KAT3 (Hold ATU Tune), use it to show a low VSWR to the rigs finals, then disable it (Hold ATU TUNE) again. You will then find that the VSWR will presented to the rig will be correct as per the analyser. I don't why the KAT3 still appears to be in circuit when supposedly switched out but at least there is a workaround. Funny I tried that too and still got HISWR cause that is what I thought was going onbut I did this particular test so fast and I might have changed my VFO making my observation invalid. I will try again...(and verify its ANT1!). 73 -aps __ 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] KSB2 build time?
TJ, If you are doing it for the first time, give yourself 8 to 12 hours for the whole task. As Alan Wilcox has said, use Specrtrogram for alignment, and become familiar with its use beforehand since you have a deadline. The use of Spectrogram 5.17 (and its download) is available from Tom Hammond's website www.n0ss.net. Additional information on the use of Spectrogram is in the K2 Dial Calibration article on my website www.w3fpr.com. Note: if you are running Windows 7, Spectrogram 5.17 will not work - Spectrogram 16 (also freeware) will work fine. If you cannot locate it on-line, drop me a private email and I can send you a Zip file containing it. 73, Don W3FPR On 5/5/2011 1:35 PM, TJ Campie wrote: How long do you think it should take to complete a KSB2 including tuning and such? I plan on getting one at Dayton and would like to have it done in 3 or 4 evenings so I can use it when I do a SOTA activation over memorial day weekend. (which I leave for Thursday night) So figure 4 hours a night? I looked through the manual, it doesnt look like it'd take more than a few hours to assemble. TJ - W0EA __ 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] K3 vs RigExperts SWR meter issue
As a confidence building exercise, try it into a dummy load rather than the amp. If it works into the dummy load, blame the input if the amplifier. 73, Don W3FPR On 5/9/2011 6:22 PM, Alexander Sack wrote: On Mon, May 9, 2011 at 6:03 PM, Jeff Cochrane - VK4BOF vk4bof.elecr...@gmail.com wrote: Hi Alexander, I see this a lot with my K3. The truth is that the KAT3 is never really out of circuit. The trick is to enable the KAT3 (Hold ATU Tune), use it to show a low VSWR to the rigs finals, then disable it (Hold ATU TUNE) again. You will then find that the VSWR will presented to the rig will be correct as per the analyser. I don't why the KAT3 still appears to be in circuit when supposedly switched out but at least there is a workaround. Funny I tried that too and still got HISWR cause that is what I thought was going onbut I did this particular test so fast and I might have changed my VFO making my observation invalid. I will try again...(and verify its ANT1!). __ 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] AA Engineering Charger + KBT2
Don, I'm sorry but I fail to understand why you think that the bulk charge mode will overcharge the battery. Properly configured, the smart charger won't even completely charge the battery in the bulk mode, it takes a shift to the higher voltage absorption (overcharge) mode to completely top off the battery, after which the charger should reduce its output to the float voltage. The whole idea behind the smart charger is the automation of the charge cycle without intervention. The bulk mode current should be set by design to some fraction of the capacity (AH rating) of the battery and left alone. I have a homebrew charger keeping a 95AH Deka AGM battery charged and have operated my K3/100 on it 100% of the time for over two years. I built it using an AA board in a modified Astron 35A power supply. http://k6mhe.com/n7ws/Astron_A_A.jpg Wes --- On Mon, 5/9/11, Don Wilhelm w3...@embarqmail.com wrote: From: Don Wilhelm w3...@embarqmail.com Subject: Re: [Elecraft] AA Engineering Charger + KBT2 To: Brian - N5BCN n5...@yahoo.com Cc: elecraft@mailman.qth.net Date: Monday, May 9, 2011, 12:16 PM Brian, The consideration over the bulk charge rate is still valid - if the charger goes into bulk charge state the voltage is higher - AND, if the receive current is much lower than the bulk charge current, the battery can be over-charged. To prevent that condition, the bulk charge rate should be lower than the receive current (it does not have to be matched to the receive current - just lower). What will happen is that part of the receive current will come from the charger and some from the battery - all is well as long as your operating times are only for a few hours, the battery will provide plenty of juice. The switchable Smartcharger is a real help here, but I would suggest using 1 amp for the higher current rate - provided you resolve to leave it at the low current rate until your operating session exceeds 2 or 3 hours, and at that time, switch the charger to the 1 amp rate. If you cannot make that resolution, then I would suggest your proposed 250/500 ma combination would be better. 73, Don W3FPR On 5/8/2011 8:02 PM, Brian - N5BCN wrote: Hi all, AA Engineering's QRP Smart Charger has the option to be built using two of the four charging rates: 0.250 A, 0.500 A, 0.750 A, and 1.00 A. I plan to run my K2 using a KBT2 + Charger combo. Which two charging rates would be suit this setup? My K2 has a number of options and draws about 380 mA right now on receive, considerably more when the remoted KPA100 goes into high power mode (remoted KPA100 obviously runs on a different power source). I've read W3FPR's Smart Charger Mod and he's using 250 mA, so I'm leaning towards the 250 mA/500 mA combo, however, I don't think his mod is used in conjunction with a remoted KPA100. 73 N5BCN - Brian - K2 #6800 KPA100/KAT100-2, KSB2, KAT2, KIO2, K160RX, KNB2, KAF2, LP-PAN/K2 w/ Pre-amp, SignaLink USB -- View this message in context: http://elecraft.365791.n2.nabble.com/A-A-Engineering-Charger-KBT2-tp6342835p6342835.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 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
[Elecraft] [K3] K3's in the Stew Perry
Elecraft K3's mentioned repeatedly in the results of the 2010 Stew Perry contest: http://web.jzap.com/k7rat/2010_Stew.htm __ 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] P3 Strange Display Behavior on BSET
I'm running P3 firmware 1.05. If I have my SubRX enabled and the two receivers tuned to two different signals, my P3 cursors are displayed exactly as expected. If I then hit BSET, the P3's VFO A cursor and display (including the displayed VFO frequency) shift to the VFO B frequency, despite the fact that the audio for both RXs does not change, indicating no change in the VFO A in reality. This also results in an incorrect display for the VFO B cursor because it is displayed as though it were tuned to the VFO A frequency. Tuning the VFO B is no longer synchronized to the P3 display. Turning off BSET returns the P3 display to the correct state. Has anyone else seen this? - 73, Stan - KR7C -- View this message in context: http://elecraft.365791.n2.nabble.com/P3-Strange-Display-Behavior-on-BSET-tp6346122p6346122.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
Re: [Elecraft] XV432 Oscillates with Amp connected
I had a similar problem with my XV432. I was able to chase the problem to the tx driver stage. The fix was to add ground vias from the top to the bottom of the board in a few judicious places. I passed this info back to Gary at Elecraft. I know of at least one other XV432 that has been stabilized by this method. I don't see those mods in the latest XV432 errata sheet, perhaps they vias have been added to the latest circuit board or they have found other ways to cure the problem. 73, Mike, W3IP From: Edward R. Cole kl...@acsalaska.net To: Elecraft@mailman.qth.net Sent: Mon, May 9, 2011 12:46:11 PM Subject: [Elecraft] XV432 Oscillates with Amp connected First off let me state that I do not have any of the equipment Stu is using. The fact the XV432 likes the 50-ohm termination (dummy load to the rest of us), says it looks like a termination loading issue. The Henry 2004 should offer a 50-ohm load at input. Some amps require input tuning (my 2m-8877 is very touchy on input tuning and does not present a low SWR; best I get is 1.7:1). My amp is HB so I know why. Transmitting into open unterminated coax will normally show standing wave peaks and valleys. But perhaps the XV432 is going into self-oscillation when not seeing a good load? If you have enough excess power I would suggest using a 3-dB attenuator between the XV432 and Henry amp. It will have to be rated for full power of the XV432. Many amps even have an internal attenuator on the input (mainly to broadband input tuning). Do you have another 432 transmitter to test with the Henry amp? Also, try different lengths of coax between the XV432 and the amp. Oh, and test those coax lines with the 50-ohm termination on the far end (should see no oscillation or SWR). If the XV432 is going into self-oscillation it might be RF feedback from the Henry amp thru power lines? Try moving the XV432 dc cables to see if that causes any effect. If so wrapping the dc cord thru a toroid core may help (also check that there is RF bypassing inside the XV432 on the dc input. Should see a bypass cap and maybe ferriite beads on the dc line. Check station grounding. That Henry needs a good RF and safety ground to an external ground post and house wiring ground (this has been a recent topic). Have you tested with the Henry into a 50-ohm termination (dummy load)? High SWR on the antenna can also produce these effects with a high-power amp. (of course no all of us have a QRO dummy load) I have a 500w Sierra Electronics air cooled load that will sustain up to 1000w for quick checks (no sustained key-down). At 1500w, I usually use my 2m eme array as best load (on a clear freq.). GL, Ed - KL7UW -- Message: 2 Date: Sun, 08 May 2011 13:34:55 -0400 From: Stu2 s...@stu2.net Subject: [Elecraft] XV432 Oscillates with Amp connected To: elecraft@mailman.qth.net Message-ID: 4dc6d43f.2090...@stu2.net Content-Type: text/plain; charset=ISO-8859-1; format=flowed Good day, I'm working with the XV432, Flex 1500 and Henry 2004A Amp. The rig, xvrtr and amp PTTs are sequenced. Hoping somebody might have been down this path before and has a solution. If I connect the transverter output to the amp (or different pieces of open coax) and key the transverter, the power meter goes full scale and I see an oscillation on the spectrum analyzer. The frequency of the oscillation varies with the load. (i.e. amp connected or different lengths of coax) If I connect the XV432 to a 50 ohm load, no oscillations and all works well. I ran through the alignment procedure again with the XV432 connected to a 50 Ohm load. All the voltages look right and the tuning is smooth. (e.g. 20mV Quiescent Current Adjustment, TP3/TP4) It's obvious the XV432 is happy into 50 Ohms, but not into impedances that wander from 50 Ohms. BTW, I have added all the mods as per the Elecraft website. Any ideas? 73's Stu2 W7IY 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 50-1.1kW?, 144-1.4kw, 432-100w, 1296-testing*, 3400-? DUBUS Magazine USA Rep dubus...@hotmail.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 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] P3 Strange Display Behavior on BSET
Hi Stan, I turned on my KRX3 and BSET. My P3 display did not show the VFO B frequency and the cursor remained with VFO A. When I pushed ALT, VFO B did change to the opposite sideband as expected. Roy Morris W4WFB __ 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] P3 Strange Display Behavior on BSET
I think that the aberrant BSET behavior only occurs when the diversity mode is on. This is related to the front panel display (and the SUB receiver) switching over to VFO B during BSET, but I don't see it when not diversity. 73, Guy On Mon, May 9, 2011 at 9:11 PM, Roy Morris w4...@carolina.rr.com wrote: Hi Stan, I turned on my KRX3 and BSET. My P3 display did not show the VFO B frequency and the cursor remained with VFO A. When I pushed ALT, VFO B did change to the opposite sideband as expected. Roy Morris W4WFB __ 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
[Elecraft] K3 KDVR3 Digital Voice Recorder
During the 7QP this past weekend my KDVR3 Digital Voice Recorder would upon occasion provide no audio while the transmitter was keyed. I was using N1MM Logger and I do not recall doing anything that might have interrupted the KDVR3 Digital Voice Recorder such as tapping my foot switch while the software had already keyed the transmitter or hitting any additional keys on the keyboard. I found that the only way to get the KDVR3 Digital Voice Recorder back to normal operation was to turn off the K3 and then of course to turn it on again. I hope this is just some kind of cockpit error on my part. I don't recall any such discussions in recent history so please comment if you can... 73, Steve WU9B __ 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] KPA500, Elecraft hits another home run!
Just received and put KPA500 #24 on the air today. Wow! what a great product and well worth the wait. I drooled over it at Visalia and it’s just great to get to put one on the air. Thanks to all the people at Elecraft that made this possible and produced such a great amplifier. It fits perfectly in the spot I reserved for it. Thanks again, Good Job! Todd, WA7U __ 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] P3 Strange Display Behavior on BSET
I confirm the bug when in fixed-tune mode. I'll add it to the list, thanks. Alan N1AL On Mon, 2011-05-09 at 17:19 -0700, Stan Gibbs wrote: I'm running P3 firmware 1.05. If I have my SubRX enabled and the two receivers tuned to two different signals, my P3 cursors are displayed exactly as expected. If I then hit BSET, the P3's VFO A cursor and display (including the displayed VFO frequency) shift to the VFO B frequency, despite the fact that the audio for both RXs does not change, indicating no change in the VFO A in reality. This also results in an incorrect display for the VFO B cursor because it is displayed as though it were tuned to the VFO A frequency. Tuning the VFO B is no longer synchronized to the P3 display. Turning off BSET returns the P3 display to the correct state. Has anyone else seen this? - 73, Stan - KR7C -- View this message in context: http://elecraft.365791.n2.nabble.com/P3-Strange-Display-Behavior-on-BSET-tp6346122p6346122.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 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] K3 KDVR3 Digital Voice Recorder
Steve, I had the same problem, though it was intermittent. In my case, once the radio heated up the recording would be truncated, first a little, eventually playing only the first couple of seconds. Elecraft swapped out the KDVR, and it's been OK since. (OT - I spent many hours riding my bicycle up and, less, riding down Rio Verde Drive, just south of you, and my cousin manages the Rio Verde stables just SE of you.) Jim N7US -Original Message- During the 7QP this past weekend my KDVR3 Digital Voice Recorder would upon occasion provide no audio while the transmitter was keyed. I was using N1MM Logger and I do not recall doing anything that might have interrupted the KDVR3 Digital Voice Recorder such as tapping my foot switch while the software had already keyed the transmitter or hitting any additional keys on the keyboard. I found that the only way to get the KDVR3 Digital Voice Recorder back to normal operation was to turn off the K3 and then of course to turn it on again. I hope this is just some kind of cockpit error on my part. I don't recall any such discussions in recent history so please comment if you can... 73, Steve WU9B __ 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
