[Elecraft] JT modes alignment
Hello, After successful use of JT65 with my KX3 overseas, I am back to my K2. According to the manual, the r mode is advised, because passband and ALC are optimized. (I never use RTTY) On my rig, the r mode, as the reverted r mode, give the same reverted tones on the wsjt window, and no decode, of course. Is JT65 impossible on this mode, or do I have to reconsider the filters alignment or anything else ? Best 72 de Jean-Marc, F5LCI To nobody, except those who will take pleasure here (Franz Schubert, 1797-1828) -- View this message in context: http://elecraft.365791.n2.nabble.com/JT-modes-alignment-tp7584041.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] Vedr: Elecraft Kit Idea
Excellent idea!! But it should be a transverter so I could transmit on the 137 kHz band and the 600 m band. Martin Storli LA8OKA Oslo, Norway ARCTICPEAK's Radio pages! http://www.arcticpeak.com/radio.htm Fra: K7JLTextra k7jltex...@gmail.com Til: elecraft@mailman.qth.net elecraft@mailman.qth.net Sendt: Mandag, 10. februar 2014 16.59 Emne: [Elecraft] Elecraft Kit Idea An up converter from 10kHz to 500kHz with typical Elecraft quality would be acceptable by me. I have one already but not of the quality I would expect from the boys in Aptos, so would gladly purchase build their kit. John Hendricks K7JLT __ 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] JT modes alignment
Jean-Marc, Yes, you will need to align those filters. I normally set the FL1 position to OP1, FL2 to 1.00, FL3 to 0.70 and FL4 to 0.40 widths. Then set the BFOs for FL1 to the same values as the SSB filters - RTTY corresponds to LSB and RTTY REV corresponds to USB. That filter will be used for transmit in all cases and works well with a waterfall display for normal receive. Set the other filters to center on 1000 Hz. Those can be used if a strong interfering signal appears inside the passband of the OP1 filter. Observe the LSB/USB relationship - the DAC numbers (and also frequency) will be higher for RTTY REV. If you have the KDSP2 option, also set those filters 2, 3, and 4 to center at 1000 Hz to agree with the IF filter centers. The use of Spectrogram is recommended when aligning the IF filters. You can download a copy from my website www.w3fpr.com - look near the bottom of the home page. Instructions for the use of Spectrogram can be found in the K2 Dial Calibration article. 73, Don W3FPR On 2/11/2014 3:07 AM, F5LCI wrote: Hello, After successful use of JT65 with my KX3 overseas, I am back to my K2. According to the manual, the r mode is advised, because passband and ALC are optimized. (I never use RTTY) On my rig, the r mode, as the reverted r mode, give the same reverted tones on the wsjt window, and no decode, of course. Is JT65 impossible on this mode, or do I have to reconsider the filters alignment or anything else ? Best 72 de Jean-Marc, F5LCI To nobody, except those who will take pleasure here (Franz Schubert, 1797-1828) -- View this message in context: http://elecraft.365791.n2.nabble.com/JT-modes-alignment-tp7584041.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] JT modes alignment
Hi Don, and thank you for the fast reply (as usual!) I can use the USB mode, decoding is OK, But the ALC is not optimized for digital modes. My only problem: R and reverse R behave equally ; I thought that the tones would be inverted... I seriously wonder : Was I wrong with alignment with the reverse R mode only ? I had carefully aligned my filters ...many years ago, before JT65 appeared. So I'll have to RTFM to remind the procedure. Back to the book... 72, Jean-Marc, F5LCI Le Tue, 11 Feb 2014 14:15:27 +0100, Don Wilhelm w3...@embarqmail.com a écrit: Jean-Marc, Yes, you will need to align those filters. I normally set the FL1 position to OP1, FL2 to 1.00, FL3 to 0.70 and FL4 to 0.40 widths. Then set the BFOs for FL1 to the same values as the SSB filters - RTTY corresponds to LSB and RTTY REV corresponds to USB. That filter will be used for transmit in all cases and works well with a waterfall display for normal receive. Set the other filters to center on 1000 Hz. Those can be used if a strong interfering signal appears inside the passband of the OP1 filter. Observe the LSB/USB relationship - the DAC numbers (and also frequency) will be higher for RTTY REV. If you have the KDSP2 option, also set those filters 2, 3, and 4 to center at 1000 Hz to agree with the IF filter centers. The use of Spectrogram is recommended when aligning the IF filters. You can download a copy from my website www.w3fpr.com - look near the bottom of the home page. Instructions for the use of Spectrogram can be found in the K2 Dial Calibration article. 73, Don W3FPR -- View this message in context: http://elecraft.365791.n2.nabble.com/JT-modes-alignment-tp7584041p7584044.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] What is actually present on Rx-Out BNC of the KXV3 RF bosrd??
I bought a Fucubr Donglr Pro+ AKA FCDP+ or FC+ . The USB device has a connector to which, via adapter(s), one can connect any antenna we all own. So I want whatever antenna the K3 is currently using to let signals from that antenna, in the Rx mode only, to be present on Rx-Out BNC, on the back of my K3. I thought I was perhaps there except that the signals appearing on a waterfall display, of SDR-Radio program, were all but reduced to 0 they were so very very weak. Is there another adjustment, in the CONFIG, I need to make? -- Bob KD7YZ http://www.qrz.com/db/KD7YZ www.denstarfarm.us/LGD __ 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] Need a few testers for new K3/KPA500/KAT500 field-test firmware
These new releases correct all known amp/ATU retuning problems, and also add frequency tracking, where the KAT500 updates its LC network as you move the K3's VFO. If you have time to install and test the new firmware right away, please email me directly. Wayne N6KR __ 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] KX3 -- Want P3-Like Display on a Mac
Looked around a bit more and perhaps NaP3 may be the way to go. I need to do a bit more research on this. Also looks like maybe LP-Bridge or LPB2 may be needed if I want the KX3 to get to multiple applications. Not sure on that one. I use the Mac version of the KX3 Utility and my logging program is MacLoggerDX (also a Mac app), so LPB2 may have no benefit for me, unless I can find a way for the virtual ports to be split between Win/XP and OS X. One other thing that I'm concerned about is this soundcard issue. Not sure how to handle such things on an iMac. But I'll figger it out! :-) Jim / W6JHB On Feb 10, 2014, at 9:59 PM, Matt VK2RQ wrote: If you are happy to run Windows XP under VMWare, then NaP3 will give you a good experience. I briefly had a closer look at Quisk -- the problem is that is depends on ALSA sound libraries, and since macports doesn't support this, a little bit of hacking is required to remove this dependency and rely solely on the portaudio libraries. There would also some (trivial) changes required to remove dependencies on the linux parallel port driver. Not sure if someone has already gone through this exercise yet or not. Otherwise, you would need some basic coding skills to make it work. The I/Q output needs to be fed into a soundcard with stereo capability -- this soundcard could be a USB soundcard such as the Soundblaster X-Fi. Most of the PC SDR applications can then use this to display a waterfall. The I/Q streams don't contain digital data or anything fancy like that, rather they are simple analogue signals. This is why you need a soundcard or other A/D convterter to digitise the signal in order to for the SDR application to process it. It is convenient to have some basic integration with the radio (ie. via the KXUSB or KXSER cable) so that the application can read the VFO frequency from the radio and display appropriate frequency labels on the spectrum/waterfall display, but this is a nice-to-have. 73, Matt VK2RQ __ 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] What is actually present on Rx-Out BNC of the KXV3 RF bosrd??
There is nothing there on the RX Out unless one select RX Ant. Look at the K3 schematics and read the Owners Manual. If you want to split the main receiver antenna feed, you will need to add a splitter to the RX Out, connect one output port to your Fucbr (whatever that is), the other output port back to the RX Ant jack and select RX Ant. The splitting loss will be a killer on 6, 12, 10 and possibly 15 meters so it will be necessary to use a preamp ahead of the splitter to maintain sensitivity on those bands. 73, ... Joe, W4TV On 2/11/2014 10:54 AM, Bob KD7YZ wrote: I bought a Fucubr Donglr Pro+ AKA FCDP+ or FC+ . The USB device has a connector to which, via adapter(s), one can connect any antenna we all own. So I want whatever antenna the K3 is currently using to let signals from that antenna, in the Rx mode only, to be present on Rx-Out BNC, on the back of my K3. I thought I was perhaps there except that the signals appearing on a waterfall display, of SDR-Radio program, were all but reduced to 0 they were so very very weak. Is there another adjustment, in the CONFIG, I need to make? __ 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] [Elecraft_K3] curious behavior of the K3/P3, etc.
Sorry Bill and all--I was describing the behavior when on CW. I more often use these adjustments on CW, but if it is important for understanding the question (and for me to understand what's going on!) I will check with SSB when I get home this evening. Thanks, Scott AA0AA From: bill conkling n...@widomaker.com To: Scott Monks cq_dx_de_aa...@yahoo.com Sent: Tuesday, February 11, 2014 9:55 AM Subject: Re: [Elecraft] [Elecraft_K3] curious behavior of the K3/P3, etc. On question 2, what band? On LSB bands, HiCut is the lower freq edge as its the farthest away from the center carrier, hence higher freq audio. ...bill nr4c Sent from my Verizon Wireless 4G LTE DROID Scott Monks cq_dx_de_aa...@yahoo.com wrote: Now before you guys think I too am complaining--no, I just have a curious mind! Two questions that I am sure you more experienced can help me with: 1. When I begin narrowing the DSP down, on filter 1 (2.7, std, offset -0.84) only the lower freq side moves. The DSP switches to the 2.1 filter, reacting the same, but when it narrows to about 1.10 (within filter 2; 2.1, offset 0.0) it changes so that both low and high move equally. Even narrowing continues through the 700 and 400 Hz filters. The reverse occurs in the same way. I have checked the offsets with the K3 program, and they are set as required. On the K-3 display the bar-thing always seems to move equally on both sides. Is this normal? 2. When seen on the P-3, on hi-cut-lo, if I move the lo side, the higher freq side moves, and if I move the hi side, the lower freq side moves. On the K-3 display the expected side moves. Again, is this normal? I have the last production software installed. This was first noticed when I got the P3 and a big screen, when in a contest I wanted to shift the receiver up to avoid a disturbing signal and found I had to move the hi side to move the lo side! Now I am accustomed and just watch my screen to make sure I am moving outside of the interfering peak. These only bother me because I know there must be a reason but I don't why it happens! If curiosity is going to kill the cat, don't tell me and I will just continue to be happy with my partial K-line! Thanks for your patience, Scott AA0AA __ 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] Help setting up K3 w N1MM
I had no problem doing what you ask on my old XP laptop, and after it finally flamed out, I set the same thing up on the new Win 7 laptop. I use the USB-serial adapter I think I got from Elecraft [Prolific chip set at any rate] which comes up as COM4. With XP and PTT/Keying through the RTS-DTR lines, the CW was *almost* flawless. Every now and then, Windoze would decide it needed to do something more important than running N1MM for me and if the logger was sending something at that moment, it would be massacred. I finally went to a WinKeyUSB which comes up as COM5 and all is well. Never tried RTS-DTR keying with the Win 7 machine. So, what you want is normal operation for N1MM. You need to check the Windows Device Manager [Ports] to see what the COM port is for your adapter to the K3. In the N1MM Config menu, go to Config Ports menu [top one] and set that COM port to a K3. If you're still going to use RTS-DTR keying, you set that up using the SET button to the right of the COM port entry. Be sure and set the K3 menu item to match. 73, Fred K6DGW - Northern California Contest Club - CU in the 2014 Cal QSO Party 4-5 Oct 2014 - www.cqp.org On 2/10/2014 8:39 PM, Dave Barr wrote: I am looking for advice in how to set up my K3 with N1MM incorporating rig control at least to the extent of having the radio control the logging frequency and mode shown in N1MM primarily for AFSK RTTY using just the Elecraft USB to serial adapter cable (in addition to the audio in/out connections to the computer sound card).I have had no problem setting up for Digital and CW without any K3 to N1MM control interaction other than ptt and cw keying. The K3 Utility works fine. The digital engine is MMTTY. Page 84 of the KE7X K3 manual suggests that what I want to do is possible. Help! Dave, K2YG __ 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] Tuner Loss question
I have lots of data in the loss to be expected in Coax or Open wire when running at higher SWR into a multiband antenna - however, I do NOT have any real world data on the losses to be expected in a tuner system at higher SWR. So: Are there any numbers available on what additional losses my Elecraft K3 (SN 5283) antenna tuner will experience when the SWR is high - say about 5:1 or higher when feeding a multiband antenna with 50 Ohm coax on 20 meters? Should I expect another 3 dB down in signal strength during receive - and also Transmit? Or are the losses higher or lower then that? Also, are the losses frequency dependent (like on coax) or are they the same across the bands. Thanks for any available data. Jobst AC0LP __ 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] SSB net last Sunday
I am sorry for disappearing last weekend. We got a heavy snowstorm over two days followed by an ice storm. I had 11” of snow and then thick ice on everything. Branches and entire trees came crashing down. The were widespread power outages. My power was off from Saturday morning until dinner time yesterday. I tried sending emails to the list via cell phone but evidently couldn’t get enough signal. I still can’t get our cars out to the paved road, even though I spent several hours plowing and shoveling yesterday. It’s up into the 40s today, so I’m hopeful. Fortunately, my antennas survived the ice fine. The quad’s wires really sagged, but they held up. Was there a net on Sunday? 73, Phil, NS7P __ 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] [Elecraft_K3] curious behavior of the K3/P3, etc.
Hi/lo cut is usually used for ssb operation. But I think K3 cw is lower than carrier so same applies. ...bill Sent from my Verizon Wireless 4G LTE DROID Scott Monks cq_dx_de_aa...@yahoo.com wrote: Sorry Bill and all--I was describing the behavior when on CW. I more often use these adjustments on CW, but if it is important for understanding the question (and for me to understand what's going on!) I will check with SSB when I get home this evening. Thanks, Scott AA0AA From: bill conkling n...@widomaker.com To: Scott Monks cq_dx_de_aa...@yahoo.com Sent: Tuesday, February 11, 2014 9:55 AM Subject: Re: [Elecraft] [Elecraft_K3] curious behavior of the K3/P3, etc. On question 2, what band? On LSB bands, HiCut is the lower freq edge as its the farthest away from the center carrier, hence higher freq audio. ...bill nr4c Sent from my Verizon Wireless 4G LTE DROID Scott Monks cq_dx_de_aa...@yahoo.com wrote: Now before you guys think I too am complaining--no, I just have a curious mind! Two questions that I am sure you more experienced can help me with: 1. When I begin narrowing the DSP down, on filter 1 (2.7, std, offset -0.84) only the lower freq side moves. The DSP switches to the 2.1 filter, reacting the same, but when it narrows to about 1.10 (within filter 2; 2.1, offset 0.0) it changes so that both low and high move equally. Even narrowing continues through the 700 and 400 Hz filters. The reverse occurs in the same way. I have checked the offsets with the K3 program, and they are set as required. On the K-3 display the bar-thing always seems to move equally on both sides. Is this normal? 2. When seen on the P-3, on hi-cut-lo, if I move the lo side, the higher freq side moves, and if I move the hi side, the lower freq side moves. On the K-3 display the expected side moves. Again, is this normal? I have the last production software installed. This was first noticed when I got the P3 and a big screen, when in a contest I wanted to shift the receiver up to avoid a disturbing signal and found I had to move the hi side to move the lo side! Now I am accustomed and just watch my screen to make sure I am moving outside of the interfering peak. These only bother me because I know there must be a reason but I don't why it happens! If curiosity is going to kill the cat, don't tell me and I will just continue to be happy with my partial K-line! Thanks for your patience, Scott AA0AA __ 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] The K3 and P3 have been sold pending receipt of funds
73 and thanks to all Bill AA7XT __ 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] OT ... Coax DC isolator
Off topic here: I am experimenting with two different antennas and would like to switch between them with a relay. I am considering getting an isolator that permits placing the DC control voltage on the rf coax. Any thoughts on this? I have never done this before and would appreciate any advice/suggestions. OH...I am using my K3/10...so maybe not ENTIRELY off topic :-) -- John K5ENQ __ 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] OT ... Coax DC isolator
It is not very hard to do this John. Just feed the RF in and out with a couple of RF capacitors and feed the DC in and out through 1 or 2 MH chokes I think MFJ has them for sale and I know they have them in tje MFJ 927 AMP. Willis 'Cookie' Cooke, TDXS DX Chairman K5EWJ Trustee N5BPS, USS Cavalla, USS Stewart From: John Saxon johnbsa...@yahoo.com To: elecraft@mailman.qth.net elecraft@mailman.qth.net Sent: Tuesday, February 11, 2014 12:34 PM Subject: [Elecraft] OT ... Coax DC isolator Off topic here: I am experimenting with two different antennas and would like to switch between them with a relay. I am considering getting an isolator that permits placing the DC control voltage on the rf coax. Any thoughts on this? I have never done this before and would appreciate any advice/suggestions. OH...I am using my K3/10...so maybe not ENTIRELY off topic :-) -- John K5ENQ __ 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] [Elecraft_K3] curious behavior of the K3/P3, etc.
OK, if you're talking about CW, the K3's normal CW is on lower sideband. In CW the filter behaviour gets tangled up with the sidetone pitch setting, which is also the default FC (centre frequency) for the filters in CW mode. Suppose the sidetone pitch/FC is 500 Hz and the BW (bandwidth) is 2000 Hz. Given those numbers, the calculated hi-cut and lo-cut frequencies would be 1500 Hz (FC + BW/2) and -500 Hz (FC - BW/2). That's a minus sign on the lo-cut frequency, meaning it's on the other sideband. The firmware should not allow that; it needs to place the lo-cut frequency on the proper sideband far enough above zero to give adequate carrier and opposite sideband suppression. IIRC, the low-pass cutoff is adjustable in the latest firmware - I believe it can be set to 100 Hz, 200 Hz or 300 Hz. So, with the low-pass cutoff set at 200 Hz, FC at 500 Hz and BW at 2000 Hz, the actual filter bandpass will be from 200 Hz to 1500 Hz. Adjusting the Width control would only affect the upper limit, as the lower limit is fixed by the low-pass cutoff. If the Width setting is sufficiently narrow for the calculated lo-cut frequency to be at or above the low-pass cutoff (100, 200 or 300 Hz), the effect of the Width control becomes symmetric about the centre frequency, as you might have originally expected. Because CW is on the lower sideband, adjusting the Width control only affects the lower RF (=higher audio) edge of the bandpass - the upper edge is fixed by the low-pass cutoff. Does this help make sense of your observations? 73, Rich VE3KI AA0AA wrote: Sorry Bill and all--I was describing the behavior when on CW.=A0 I more oft= en use these adjustments on CW, but if it is important for understanding th= e question (and for me to understand what's going on!) I will check with SS= B when I get home this evening. __ 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] OT ... Coax DC isolator
The thing that puts DC on coax is called a bias tee, so search for that. --wunder (K6WRU) On Feb 11, 2014, at 11:00 AM, WILLIS COOKE wrco...@yahoo.com wrote: It is not very hard to do this John. Just feed the RF in and out with a couple of RF capacitors and feed the DC in and out through 1 or 2 MH chokes I think MFJ has them for sale and I know they have them in tje MFJ 927 AMP. Willis 'Cookie' Cooke, TDXS DX Chairman K5EWJ Trustee N5BPS, USS Cavalla, USS Stewart From: John Saxon johnbsa...@yahoo.com To: elecraft@mailman.qth.net elecraft@mailman.qth.net Sent: Tuesday, February 11, 2014 12:34 PM Subject: [Elecraft] OT ... Coax DC isolator Off topic here: I am experimenting with two different antennas and would like to switch between them with a relay. I am considering getting an isolator that permits placing the DC control voltage on the rf coax. Any thoughts on this? I have never done this before and would appreciate any advice/suggestions. OH...I am using my K3/10...so maybe not ENTIRELY off topic :-) -- John K5ENQ __ 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] KX3 for Sale UK
*Elecraft KX3 - Fully loaded plus Wonder Wand Wideband antenna.* Serial Number 2657, bought from WS fully assembled. As well as the Basic KX3 it has the following fitted ·Roofing filter KXFL3 ·Auto ATU KXAT3 ·NiMH charger clock KXBC3 Complete with MH3 microphone KXUSBA interface lead and fitted with a set of High Capacity NiMH cells. Latest firmware upgrade loaded and in excellent clean working condition with original box manual. I will provide a power lead with correct DC plug and the psu end terminated in 4mm plugs plus a BNC to SO239 adaptor. Reason for sale is deteriorating health - means I won't be able to get out and about as much in future - and also won't be able to get the 100W linear to use as a base station. I have used this a few times parked in a noise free country park with a whip antenna on the car with very good results considering the power but never used the Wonder Wand! Mainly used as a receiver at home - excellent filtering - as I've a very noisy urban location. If you collect I'll throw in a dedicated stand and a Watson SP-180A amplified speaker or these will be sold separately. To buy now would cost £1552-65 Only £1080 ovno inc economy UK mainland delivery (next day can be arranged at cost) or come see it working over a coffee in Basildon, Essex. __ 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] OT ... Coax DC isolator
John, Does isolators are called bias-Ts. They are a common way to do what you want. You should be able to buy one without great difficulty. Just make sure that the one you buy is for the frequency range you plan to use it in. MFJ makes one for HF if that is where you plan to operate. 73, Barry K3NDM On 2/11/2014 1:34 PM, John Saxon wrote: Off topic here: I am experimenting with two different antennas and would like to switch between them with a relay. I am considering getting an isolator that permits placing the DC control voltage on the rf coax. Any thoughts on this? I have never done this before and would appreciate any advice/suggestions. OH...I am using my K3/10...so maybe not ENTIRELY off topic :-) -- John K5ENQ __ 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] KXPA100...would a person opt to buy a KAT500 instead?
Hi, Just a question for the group:If someone buys a KXPA100 amp for the KX3, is it possible that they decide not to get the KXAT100 tuner and instead go for a KAT500? Thanks, Tom va2fsq __ 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] OT ... Coax DC isolator
Here is an interesting article: http://www.ad5x.com/images/Articles/BiasT3amp.pdf Svend, OZ7UV __ 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] W4SMT K3 S-Meter
I'm sorry. I googled this but only get messages in forums with only one link which only goes to an eye glasses company. Could someone pass along a URL for the download? 73, Tim Herrick, KQ8M Charter Member North Coast Contesters k...@kq8m.com AR-Cluster V6 kq8m.no-ip.org User Ports: 23, 7373 with local skimmer, 7374 without local skimmer Server Ports: V6 3607, V4 Active 3605, V4 Passive 3606 -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Fred Jensen Sent: Monday, February 10, 2014 10:30 PM To: Elecraft Reflector Subject: [Elecraft] W4SMT K3 S-Meter OK, I tried this. Fairly cool! Doesn't work in contests when N1MM owns the CAT, but all the other times, it just does work. I'm pretty much CW, I pretty much run the CWT, so I see nothing on the S-meter above S9. Now, I've been in this hobby for 60 years, I know none of this really matters, but seeing an S-Meter that looks vaguely like the one on my SX-28 as a teenager is sort of cool. Still trying to figure out what the dB/uv scale under the S-scale means. I calibrated my K3 S-meter to S9 = -73dBm using my service monitor which hasn't been calibrated in at least 2 decades. Hey, this is amateur radio, just having fun here. P3 tracks with the K3 S-meter which is reassuring. If W4SMT is listening, would be great to be able to fool with the averaging, like the P3. On the other hand, I couldn't do that on my SX-28, so nothing lost there. Google W4SMT S-meter, you'll get a lot of posts [probably including this one], but the app is in there somewhere. 73, Fred K6DGW - Northern California Contest Club - CU in the 2014 Cal QSO Party 4-5 Oct 2014 - www.cqp.org __ 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] OT ... Coax DC isolator
On Tue, 11 Feb 2014 10:34:20 -0800 (PST), John Saxon wrote: I am experimenting with two different antennas and would like to switch bet= ween them with a relay. =A0I am considering getting an isolator that permit= s placing the DC control voltage on the rf coax. =A0Any thoughts on this? = =A0I have never done this before and would appreciate any advice/suggestion= s. Well, I'm NOT using a K3 :o), but I use the MFJ 2-position remote switch and have no issues with it so far. It's nice to not have to install another run of coax to the remote antenna location yet. I intend to eventually, but it got me by for now. It's a 300 foot run and the switch works as advertised. It comes without a power source (they sell separately), but does have the DC inserter box that the antenna 1-2 switch is mounted in. It is unhandy to have it on the shelf, because the coax hooks to it also. But because they are merely switching power on and off to the remote relay, you can leave it turned on, and switch the power going to it via a desk mounted switch to accomplish the same thing. Any existing 12V supply will work. Gary __ 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] Tuner Loss question
Why do you need to know the loss of the tuner? Put a power meter after the tuner and see what your rig is putting out. Is this the type of chart you are looking for?http://www.packetradio.com/pdfzips/SWRvsPowerNwatts.pdf It is not really the tuner that is causing the loss. It is more the feed line. You can test this by using an external tuner and placing a watt meter both in front and behind the tuner and see what kind of loss you are getting. Yes the tuner will have loss, but relatively negligible. 73 - Tom - wa4ta Date: Tue, 11 Feb 2014 11:47:19 -0600 From: jvand...@gmail.com To: elecraft@mailman.qth.net Subject: [Elecraft] Tuner Loss question I have lots of data in the loss to be expected in Coax or Open wire when running at higher SWR into a multiband antenna - however, I do NOT have any real world data on the losses to be expected in a tuner system at higher SWR. So: Are there any numbers available on what additional losses my Elecraft K3 (SN 5283) antenna tuner will experience when the SWR is high - say about 5:1 or higher when feeding a multiband antenna with 50 Ohm coax on 20 meters? Should I expect another 3 dB down in signal strength during receive - and also Transmit? Or are the losses higher or lower then that? Also, are the losses frequency dependent (like on coax) or are they the same across the bands. Thanks for any available data. Jobst AC0LP __ 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] Tuner Loss question
Sorry, but the chart is showing mismatch loss. When we use a tuner, we don't suffer mismatch loss; we suffer tuner losses, which despite the claim(s), can be appreciable. N7WS On 2/11/2014 2:36 PM, tom armour wrote: Why do you need to know the loss of the tuner? Put a power meter after the tuner and see what your rig is putting out. Is this the type of chart you are looking for?http://www.packetradio.com/pdfzips/SWRvsPowerNwatts.pdf It is not really the tuner that is causing the loss. It is more the feed line. You can test this by using an external tuner and placing a watt meter both in front and behind the tuner and see what kind of loss you are getting. Yes the tuner will have loss, but relatively negligible. 73 - Tom - wa4ta Date: Tue, 11 Feb 2014 11:47:19 -0600 From: jvand...@gmail.com To: elecraft@mailman.qth.net Subject: [Elecraft] Tuner Loss question I have lots of data in the loss to be expected in Coax or Open wire when running at higher SWR into a multiband antenna - however, I do NOT have any real world data on the losses to be expected in a tuner system at higher SWR. So: Are there any numbers available on what additional losses my Elecraft K3 (SN 5283) antenna tuner will experience when the SWR is high - say about 5:1 or higher when feeding a multiband antenna with 50 Ohm coax on 20 meters? Should I expect another 3 dB down in signal strength during receive - and also Transmit? Or are the losses higher or lower then that? Also, are the losses frequency dependent (like on coax) or are they the same across the bands. Thanks for any available data. Jobst AC0LP __ 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] Tuner Loss question
Check out the ARRL antenna tuner reviews. They all have loss measurements at up to 10:1 SWR for resistive loads. There are two Elecraft ARRL tuner reviews: KAT100 and KAT500. Phil – AD5X __ 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] Tuner Loss question
I'd recommend trying Dean Straw's (N6BV) excellent Transmission Line for Windows (TLW), packaged with recent editions of the ARRL Antenna book. You can make estimates of component Q and the tool estimates tuner losses for various mismatches for different tuner configurations (L versus Pi versus ...). This is a modeling, not a measurement tool. Phil, AD5X has included tuner loss information in his recent ATU review articles in QST. Maybe there's something on his site of interest. http://www.ad5x.com See particularly http://www.ad5x.com/images/Presentations/Remote%20Tuners.PDF for a description of his measurement technique for tuner loss measurement. 73 de Dick, K6KR -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wes (N7WS) Sent: Tuesday, February 11, 2014 1:54 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Tuner Loss question Sorry, but the chart is showing mismatch loss. When we use a tuner, we don't suffer mismatch loss; we suffer tuner losses, which despite the claim(s), can be appreciable. N7WS On 2/11/2014 2:36 PM, tom armour wrote: Why do you need to know the loss of the tuner? Put a power meter after the tuner and see what your rig is putting out. Is this the type of chart you are looking for?http://www.packetradio.com/pdfzips/SWRvsPowerNwatts.pdf It is not really the tuner that is causing the loss. It is more the feed line. You can test this by using an external tuner and placing a watt meter both in front and behind the tuner and see what kind of loss you are getting. Yes the tuner will have loss, but relatively negligible. 73 - Tom - wa4ta Date: Tue, 11 Feb 2014 11:47:19 -0600 From: jvand...@gmail.com To: elecraft@mailman.qth.net Subject: [Elecraft] Tuner Loss question I have lots of data in the loss to be expected in Coax or Open wire when running at higher SWR into a multiband antenna - however, I do NOT have any real world data on the losses to be expected in a tuner system at higher SWR. So: Are there any numbers available on what additional losses my Elecraft K3 (SN 5283) antenna tuner will experience when the SWR is high - say about 5:1 or higher when feeding a multiband antenna with 50 Ohm coax on 20 meters? Should I expect another 3 dB down in signal strength during receive - and also Transmit? Or are the losses higher or lower then that? Also, are the losses frequency dependent (like on coax) or are they the same across the bands. Thanks for any available data. Jobst AC0LP __ 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] Tuner Loss question
You would need to know the unloaded Q of the capacitor(s) and Inductor(s) in the circuit when a match is obtained and the complex impedance (not the SWR) of the load to calculate the total loss. More than likely, it will be highly frequency dependent. N7WS. On 2/11/2014 10:47 AM, Jobst Vandrey wrote: I have lots of data in the loss to be expected in Coax or Open wire when running at higher SWR into a multiband antenna - however, I do NOT have any real world data on the losses to be expected in a tuner system at higher SWR. So: Are there any numbers available on what additional losses my Elecraft K3 (SN 5283) antenna tuner will experience when the SWR is high - say about 5:1 or higher when feeding a multiband antenna with 50 Ohm coax on 20 meters? Should I expect another 3 dB down in signal strength during receive - and also Transmit? Or are the losses higher or lower then that? Also, are the losses frequency dependent (like on coax) or are they the same across the bands. Thanks for any available data. Jobst AC0LP __ 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] Tuner Loss question
On 2/11/2014 9:47 AM, Jobst Vandrey wrote: I have lots of data in the loss to be expected in Coax or Open wire when running at higher SWR into a multiband antenna - however, I do NOT have any real world data on the losses to be expected in a tuner system at higher SWR. Obtain some sheet syrofoam and an indoor-outdoor remote reading thermometer. Build a box from the styrofoam, enclose the tuner inside it with the remote temp sensor and seal the box up. Record the temperature. Fire up your TX into the tuner feeding the load of choice and let the temperature stabilize. Be sure and ID every 10 mins. Meanwhile, calculate the mass of the gas inside the box from its dimensions, the barometric pressure when you sealed up the box, and the Ideal Gas Law [PV=nRT]. Once the temperature stabilizes, you can calculate how much of your TX energy went into heat inside the box. The rest went up the coax. Calculate the loss from L[dB]=10*log[Ph/Po] where Ph = power lost to heat and Po = TX power. So: Are there any numbers available on what additional losses my Elecraft K3 (SN 5283) antenna tuner will experience when the SWR is high - say about 5:1 or higher when feeding a multiband antenna with 50 Ohm coax on 20 meters? Should I expect another 3 dB down in signal strength during receive - and also Transmit? Or are the losses higher or lower then that? Also, are the losses frequency dependent (like on coax) or are they the same across the bands. Seriously, the best way is to find a technical review of the tuner by someone with all the appropriate test equipment. Intrinsically, every tuner has loss that depends on many factors such as the Q of the inductors, the L/C ratios required to match a given load, the complex impedance presented to the tuner by the load, and the current phase of the moon. However, it is very difficult to measure power in non-resistive situations and the odds that the loads presented by your multiband antenna are all resistive is right behind the odds you are pregnant with twins. OK, I made up the part about the moon. I seem to remember a QST series on tuner losses a few years ago, don't know if the KAT3 was one of the ones tested. In reality, it is what it is and if you found the losses to be high at some combination, there's not much you can do about it save re-design your antenna system [or get a different tuner]. 73, Fred K6DGW - Northern California Contest Club - CU in the 2014 Cal QSO Party 4-5 Oct 2014 - www.cqp.org PS: I strongly urge the List Lurkers to get a little chuckle out of the imperfect physics in the first graf and resist the urge to correct my rendition. While I did, in 1959, manage to measure with pretty good accuracy the efficiency of a 10KW FM Class C PA using real physics very similar to my rendition above, I left out a lot in the tuner example. __ 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] OT ... Coax DC isolator
And here's another: http://www.ifwtech.co.uk/g3sek/in-prac/best-of.htm#0904 Click on April 2009 to download the complete magazine article. 73 from Ian GM3SEK -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft- boun...@mailman.qth.net] On Behalf Of Svend Spanget Sent: 11 February 2014 20:18 To: elecraft @ mailman . qth . net Subject: Re: [Elecraft] OT ... Coax DC isolator Here is an interesting article: http://www.ad5x.com/images/Articles/BiasT3amp.pdf Svend, OZ7UV __ __ 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] Antenna question
This might be a stupid question, but here goes. I have a small lot. I currently am using a 3 element Yagi that barely fits on the property. I was thinking about getting a vertical as a second HF antenna. If I put it up it is going to have to be pretty close to the Yagi. I have a dual receive K3. If I have both receivers going, one on each channel, and I broadcast on one of these antennas, am I in any danger of overloading and frying the other receiver? __ 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] JT modes alignment
Jean-Marc, As I indicated, RTTY FL1 should be set to the OP1 filter and copy the BFO setting from the LSB BFO. Likewise copy the RTTY REV BFO setting from the SSB USB BFO and you should have the RTTY FL1 behave just like USB or LSB with the exception that there is an independent SSBC setting (look for SSBCr) in the menu - it should be set to no compression (1-1) for digital modes. As far as I know, the ALC will be the same as for SSB, but one usually adds compression for SSB use which will make the ALC more aggressive. As with all digital modes with the K2, adjust the audio level so you can see just one bar of ALC indication, then back the audio down until that indicator just goes off. Adjust the desired power level with the POWER knob. Yes, this is different than the 'conventional wisdom' you will see in instructions for other rigs that control power differently than the K2. 73, Don W3FPR On 2/11/2014 9:38 AM, F5LCI wrote: Hi Don, and thank you for the fast reply (as usual!) I can use the USB mode, decoding is OK, But the ALC is not optimized for digital modes. My only problem: R and reverse R behave equally ; I thought that the tones would be inverted... I seriously wonder : Was I wrong with alignment with the reverse R mode only ? I had carefully aligned my filters ...many years ago, before JT65 appeared. So I'll have to RTFM to remind the procedure. Back to the book... 72, Jean-Marc, F5LCI Le Tue, 11 Feb 2014 14:15:27 +0100, Don Wilhelm w3...@embarqmail.com a écrit: Jean-Marc, Yes, you will need to align those filters. I normally set the FL1 position to OP1, FL2 to 1.00, FL3 to 0.70 and FL4 to 0.40 widths. Then set the BFOs for FL1 to the same values as the SSB filters - RTTY corresponds to LSB and RTTY REV corresponds to USB. That filter will be used for transmit in all cases and works well with a waterfall display for normal receive. Set the other filters to center on 1000 Hz. Those can be used if a strong interfering signal appears inside the passband of the OP1 filter. Observe the LSB/USB relationship - the DAC numbers (and also frequency) will be higher for RTTY REV. If you have the KDSP2 option, also set those filters 2, 3, and 4 to center at 1000 Hz to agree with the IF filter centers. The use of Spectrogram is recommended when aligning the IF filters. You can download a copy from my website www.w3fpr.com - look near the bottom of the home page. Instructions for the use of Spectrogram can be found in the K2 Dial Calibration article. 73, Don W3FPR -- View this message in context: http://elecraft.365791.n2.nabble.com/JT-modes-alignment-tp7584041p7584044.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] OT ... Coax DC Isolator
Many, many thanks for the fine comments and suggestions. I am going with the MFJ-4712 which is the bias tee and the relay and switch...complete and ready-to-go. Thanks again 73, John K5ENQ __ 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] Antenna question
George, That is a very good question. However, it is hard to quess. But, one thing going in your favor is that one antenna is horizontal and the other is vertical. This will minimize the amount of coupling between the two. If you can get some horizontal separation between the two, it just might be physically safe. If you get really good decoupling, it could be on the order of 30 db. that means that a 100 Watts will look like 100 mw to your receiver. I actually do a variant of what you are asking here. I have a Carolina Windom and an 18' base tuned vertical. I know there must be some interaction, but so far nothing has smoked. I know better than to try this without really looking at it, but I didn't think and did it anyway. My antennas are about 15-20 apart horizontally and 15 feet vertically. Maybe I had better have a look at it myself. But, my guess is you'll be OK as long as you don't need to receive at the same time you are transmitting. You will overdrive your receiver and not hear anything during transmissions, but the 100 mw or less into the receiver should be physically safe. That part of the answer should be answered by Elecraft as to the maximum energy the receiver can tolerate. 73, Barry K3NDM On 2/11/2014 6:36 PM, George Thornton wrote: This might be a stupid question, but here goes. I have a small lot. I currently am using a 3 element Yagi that barely fits on the property. I was thinking about getting a vertical as a second HF antenna. If I put it up it is going to have to be pretty close to the Yagi. I have a dual receive K3. If I have both receivers going, one on each channel, and I broadcast on one of these antennas, am I in any danger of overloading and frying the other receiver? __ 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] Antenna question
I have a Pennant receiving antenna about 100' from my 160 Meter Antenna. I put a scope on the Pennant coax and keyed the rig. At about 1 KW out, I saw about 6 volts pk-pk. I bought a Receiver protection device. 73, Dick, W1KSZ On 2/11/2014 4:36 PM, George Thornton wrote: This might be a stupid question, but here goes. I have a small lot. I currently am using a 3 element Yagi that barely fits on the property. I was thinking about getting a vertical as a second HF antenna. If I put it up it is going to have to be pretty close to the Yagi. I have a dual receive K3. If I have both receivers going, one on each channel, and I broadcast on one of these antennas, am I in any danger of overloading and frying the other receiver? __ 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] Antenna question
ORIGINAL MESSAGE: (may be snipped) On 2/11/2014 3:36 PM, George Thornton wrote: I have a dual receive K3. If I have both receivers going, one on each channel, and I broadcast on one of these antennas, am I in any danger of overloading and frying the other receiver? REPLY: The field around an antenna is very strong compared to the input of a receiver which is expecting a fraction of a microwatt. Not something to be messed with. If you must do this I would recommend installing a relay to short out the non-transmitting antenna, and you should sequence it so it closes a few milliseconds before beginning TX and opens a few milliseconds after ceasing TX. Even better than simple shorting, use an SPDT relay so that when the relay activated, the antenna is disconnected and the receiver input is shorted to ground, separate from the antenna. This provides even more isolation between the two. 73, Bill W6WRT __ 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] Antenna question
I would do it at all! Especially at power Sent from my iPhone On Feb 11, 2014, at 7:16 PM, Bill Turner dezrat1...@wildblue.net wrote: ORIGINAL MESSAGE: (may be snipped) On 2/11/2014 3:36 PM, George Thornton wrote: I have a dual receive K3. If I have both receivers going, one on each channel, and I broadcast on one of these antennas, am I in any danger of overloading and frying the other receiver? REPLY: The field around an antenna is very strong compared to the input of a receiver which is expecting a fraction of a microwatt. Not something to be messed with. If you must do this I would recommend installing a relay to short out the non-transmitting antenna, and you should sequence it so it closes a few milliseconds before beginning TX and opens a few milliseconds after ceasing TX. Even better than simple shorting, use an SPDT relay so that when the relay activated, the antenna is disconnected and the receiver input is shorted to ground, separate from the antenna. This provides even more isolation between the two. 73, Bill W6WRT __ 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] Balanced feedline - DC Isolator
With a pair of KAT100s and a pair of K2s, I need to send 12v up the openline feeder to control a latching relay at the top of the tower. The easiest way would be to run the dc on the feedline.and it would be even easier.. if the isolator would stop the dc from continuing on through the antenna.. that is also a dc short, inone of its configurations. I can insert the dc in the shack.. with a coax T... but there isn't a coax place at the top of the tower.Thoughts or ideas? Have a great day, --... ...-- Dale - WC7S in Wy Date: Tue, 11 Feb 2014 15:53:05 -0800 From: johnbsa...@yahoo.com To: elecraft@mailman.qth.net Subject: [Elecraft] OT ... Coax DC Isolator Many, many thanks for the fine comments and suggestions. I am going with the MFJ-4712 which is the bias tee and the relay and switch...complete and ready-to-go. Thanks again 73, John K5ENQ __ 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] Antenna question
Check out the front-end protector in the “Articles” section of my website at www.ad5x.com. Phil – AD5X __ 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] Antenna question
On 2/11/2014 3:36 PM, George Thornton wrote: This might be a stupid question, but here goes. Only unasked questions are stupid. I have a small lot. I currently am using a 3 element Yagi that barely fits on the property. I was thinking about getting a vertical as a second HF antenna. If I put it up it is going to have to be pretty close to the Yagi. You will likely find that a vertical anything will be 1-2 S-units noisier than your horizontal yagi [or any other horizontal antenna, in general], *unless* you have essentially *no* man-made noise. You said small lot which suggests an urban or suburban environment. I have a tri-bander, a large sloping Vee for 160-30, and a GAP Titan vertical on the pipe that carries my coax up to the roof and to the other antennas. I can almost always count on the GAP being a couple of S-units noiser than the other two on any of the bands they work on. I have a dual receive K3. If I have both receivers going, one on each channel, and I broadcast on one of these antennas, am I in any danger of overloading and frying the other receiver? Antennas all have a near-field and a far-field and the definition of near and far depends on the operating frequency, among some other things. The lower the frequency [longer wavelength], the farther far is from the antenna. If a second antenna is located within the near-field of the first, they will become a coupled system ... the second antenna will behave as if it was an element or elements of the first antenna. In this case, some fairly large amounts of RF power can show up at the end of the second antennas coax. Obviously, it depends a huge amount on the power you intend to run. 5W may safe. If the second antenna is clearly in the far-field of the first, the coupled power is much much lower. The signal will be huge in the second receiver, but not likely to be damaging to components. I'm on the crew that activates Alpine County in the Calif QSO Party [no permanent hams there]. First year we tried M/2, we had CW and SSB in one cabin. Considering that the aggregate ham experience of the crew was well over 200 years, I can't explain why we did this. :-) The 80 and 75 inverted Vee's were undoubtedly in each other's near-fields, not sure about the 40's, but we had bandpass filters for each rig. I was on 80 CW in the middle of the night, the phone op decided to try 75 ... he switched the filters, I called CQ, and I fried the diodes in the front end of his K3. We now have the two stations at opposite ends of the campground [maybe 500 meters?], and we have no problems. So George, I'd be very careful. The cross-polarization would be in your favor but if you're on 20 or below and close means less than a wavelength at best, it could mean problems. Hope this helps 73, Fred K6DGW - Northern California Contest Club - CU in the 2014 Cal QSO Party 4-5 Oct 2014 - www.cqp.org __ 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] Antenna question
NOT Sent from my iPhone On Feb 11, 2014, at 7:20 PM, Monovasia pontia...@monovasia.com wrote: I would do it at all! Especially at power Sent from my iPhone On Feb 11, 2014, at 7:16 PM, Bill Turner dezrat1...@wildblue.net wrote: ORIGINAL MESSAGE: (may be snipped) On 2/11/2014 3:36 PM, George Thornton wrote: I have a dual receive K3. If I have both receivers going, one on each channel, and I broadcast on one of these antennas, am I in any danger of overloading and frying the other receiver? REPLY: The field around an antenna is very strong compared to the input of a receiver which is expecting a fraction of a microwatt. Not something to be messed with. If you must do this I would recommend installing a relay to short out the non-transmitting antenna, and you should sequence it so it closes a few milliseconds before beginning TX and opens a few milliseconds after ceasing TX. Even better than simple shorting, use an SPDT relay so that when the relay activated, the antenna is disconnected and the receiver input is shorted to ground, separate from the antenna. This provides even more isolation between the two. 73, Bill W6WRT __ 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
Re: [Elecraft] Balanced feedline - DC Isolator
Dale, While you could put a bias Tee in each side of the balanced line to make it work, you need to be aware of the impedance at the points in the feedline where the DC is taken off. The isolating inductance should have 5 time (or greater) impedance at all frequencies of interest. I assume you are running a multiband antenna, so it may be easier and simpler just to 'bite the bullet' and run separate wire for the relay control. 73, Don W3FPR On 2/11/2014 7:23 PM, Dale Putnam wrote: With a pair of KAT100s and a pair of K2s, I need to send 12v up the openline feeder to control a latching relay at the top of the tower. The easiest way would be to run the dc on the feedline.and it would be even easier.. if the isolator would stop the dc from continuing on through the antenna.. that is also a dc short, inone of its configurations. I can insert the dc in the shack.. with a coax T... but there isn't a coax place at the top of the tower.Thoughts or ideas? __ 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 Won't power on
So my K2, which has been running great for almost a year, no longer powers on. I had left it powered on and connected via the serial cable to a computer so that I could do PSK-31 contacts remotely while I was away from home. Unfortunately I never got the chance, and upon my return home, my K2 was no longer working (no lights or any indication of life). I shut it off for a couple of hours, and upon turning it back on, I got a loud buzz, then everything shut down again. There was no lightning or power outages while I was gone, and unless the computer somehow put the radio into transmit, it should only have been receiving. Any ideas on where I should start to look to trouble shoot this? Thanks for any help, Jeremy VA3ZTF -- View this message in context: http://elecraft.365791.n2.nabble.com/K2-Won-t-power-on-tp7584083.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] K2 Won't power on
Hi Jeremy, That has the possibility of being the finals... where a bit of static, wind maybe? depending on the antenna connected, may have poked the finals too hard. A quick check would be to use an ohm meter, before replacement. Have a great day, --... ...-- Dale - WC7S in Wy Date: Tue, 11 Feb 2014 16:44:25 -0800 From: jjones9...@gmail.com To: elecraft@mailman.qth.net Subject: [Elecraft] K2 Won't power on So my K2, which has been running great for almost a year, no longer powers on. I had left it powered on and connected via the serial cable to a computer so that I could do PSK-31 contacts remotely while I was away from home. Unfortunately I never got the chance, and upon my return home, my K2 was no longer working (no lights or any indication of life). I shut it off for a couple of hours, and upon turning it back on, I got a loud buzz, then everything shut down again. There was no lightning or power outages while I was gone, and unless the computer somehow put the radio into transmit, it should only have been receiving. Any ideas on where I should start to look to trouble shoot this? Thanks for any help, Jeremy VA3ZTF -- View this message in context: http://elecraft.365791.n2.nabble.com/K2-Won-t-power-on-tp7584083.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] Antenna question
Hi George, I'm not 100% sure but I don't think your SUB RX has to be ON to be damaged. I believe that just connecting an antenna to the AUX RF input will allow RF into the SUB RX. There is an internal protective device on the input to the SUB RX called a carrier operated relay (COR). You can see it in the manual in some of the block diagrams. When you get your vertical you can try transmitting with the yagi at low power and gradually increase your power. If you hear a clicking sound you are tripping the COR. That's your positive indication that you should either decrease power or add external protection. There are devices available to put in your SUB RX antenna line for overload protection but you can also use the KEY OUT signal to energize a relay to disconnect your SUB RX antenna. There is also a lower current KEY OUT signal on pin 10 of the accessory connector. You can use that to trip a low current device that in turn activates a relay. 73, Mike K2MK George A. Thornton-2 wrote This might be a stupid question, but here goes. I have a small lot. I currently am using a 3 element Yagi that barely fits on the property. I was thinking about getting a vertical as a second HF antenna. If I put it up it is going to have to be pretty close to the Yagi. I have a dual receive K3. If I have both receivers going, one on each channel, and I broadcast on one of these antennas, am I in any danger of overloading and frying the other receiver? -- View this message in context: http://elecraft.365791.n2.nabble.com/Re-Antenna-question-tp7584071p7584085.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] K2 Won't power on
Jeremy, I can't recall a loud buzz condition, but I would suspect the PA transistors in the base K2. First, check the resistance from the collectors of Q7 and Q8 to ground. If it is quite low, the PA transistors are toast - get the K2PAKIT and install Q7, Q8 as well as Q11 and Q13. If the K2 will not power up, you could remove T3 (easier than removing Q7 and Q8) and see if it powers on. The fact that it powers down usually indicates that too much current is being drawn - the resettable fuse in the K2 trips at 5 amps. I would suggest removing T3 and then making some measurements. Find out if the 8R and 8T signals are behaving properly as a first step. If 8T is present at the same time as 8R, that says the K2 is trying to transmit at the same time it is receiving. Try isolating the DC to Q7 and Q8 (by removing T3) and then we can help you debug things after you get it to power up. 73, Don W3FPR On 2/11/2014 7:44 PM, JeremyJones wrote: So my K2, which has been running great for almost a year, no longer powers on. I had left it powered on and connected via the serial cable to a computer so that I could do PSK-31 contacts remotely while I was away from home. Unfortunately I never got the chance, and upon my return home, my K2 was no longer working (no lights or any indication of life). I shut it off for a couple of hours, and upon turning it back on, I got a loud buzz, then everything shut down again. There was no lightning or power outages while I was gone, and unless the computer somehow put the radio into transmit, it should only have been receiving. Any ideas on where I should start to look to trouble shoot this? Thanks for any help, Jeremy VA3ZTF __ 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 Won't power on
Q7 and Q8 both read 12.3 ohms from collector to ground. The symptoms definitely resemble blown finals, as I experienced the same thing when I was building the kit, including the over current tripping the resettable fuse. I just didn't expect that from a receive only condition. Jeremy VA3ZTF -- View this message in context: http://elecraft.365791.n2.nabble.com/K2-Won-t-power-on-tp7584083p7584087.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] K2 Won't power on
Depending on the antenna you are using Jeremy, it may be very very sensitive to static.IF your antenna has a dc (rf choke) to a good dc ground, that is also tied to the house power ground,the sensitivity will be lessened a lot. Without that.. a lightening strike 30 miles away can pop the finals... or a wind derived static, from a 25pmh breeze on a dipole. (voice of experience here) And.. I keep a complete set of the final replacement kit on hand all the time. Have a great day, --... ...-- Dale - WC7S in Wy Date: Tue, 11 Feb 2014 17:47:06 -0800 From: jjones9...@gmail.com To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K2 Won't power on Q7 and Q8 both read 12.3 ohms from collector to ground. The symptoms definitely resemble blown finals, as I experienced the same thing when I was building the kit, including the over current tripping the resettable fuse. I just didn't expect that from a receive only condition. Jeremy VA3ZTF -- View this message in context: http://elecraft.365791.n2.nabble.com/K2-Won-t-power-on-tp7584083p7584087.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] K2 Won't power on
Jeremy, OK, Q7 and Q8 are 'toast', you might as well remove them. With Q7 and Q8 removed, do a TUNE and measure the DC voltage at the solder pads for the base of Q7 and Q8. The expected voltage is 0.60 to 0.64 volts. If it is out of that range, replace Q11 and Q13 too. Those transistors come included in the K2PAKIT. 73, Don W3FPR On 2/11/2014 8:47 PM, JeremyJones wrote: Q7 and Q8 both read 12.3 ohms from collector to ground. The symptoms definitely resemble blown finals, as I experienced the same thing when I was building the kit, including the over current tripping the resettable fuse. I just didn't expect that from a receive only condition. Jeremy VA3ZTF __ 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] Balanced feedline - DC Isolator
Hi Dale, You can't inject DC into a coax feedline that carries RF with a simple T coax connector.You have to use a bias T circuit as has been recently discussed. It sounds like you have some coax from the rig to I assume a balun of some sort that connects to you balanced line. You should be able to adapt the bias T concepts to send DC thru the coax from the rig end to just before the balun using a pair of bias Ts. Then use the bias T concept on the other side of the balun to send DC through the balanced feedlilne to just before the antenna, isolating the DC from the antenna and isolating the relay from the RF. 73 - Mike WA8BXN ---Original Message--- From: Dale Putnam Date: 2/11/2014 7:23:31 PM To: elecraft@mailman.qth.net Subject: [Elecraft] Balanced feedline - DC Isolator With a pair of KAT100s and a pair of K2s, I need to send 12v up the openline feeder to control a latching relay at the top of the tower. The easiest way would be to run the dc on the feedline.and it would be even easier.. if the isolator would stop the dc from continuing on through the antenna.. that is also a dc short, inone of its configurations. I can insert the dc in the shack.. with a coax T... but there isn't a coax place at the top of the tower.Thoughts or ideas? Have a great day, --... ...-- Dale - WC7S in Wy Date: Tue, 11 Feb 2014 15:53:05 -0800 From: johnbsa...@yahoo.com To: elecraft@mailman.qth.net Subject: [Elecraft] OT ... Coax DC Isolator Many, many thanks for the fine comments and suggestions. I am going with the MFJ-4712 which is the bias tee and the relay and switch...complete and ready-to-go. Thanks again 73, John K5ENQ __ 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] OT ... Coax DC Isolator
Are there possible precautions to take when running DC through a remote antenna (coax) switch that may go to ground when the power is off? Dick - KA5KKT __ 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] Antenna question
Since the K3 will do the QRP thing down to 100 mw, think about installing the vertical above the beam on the mast and gradually try more and more power out of the K3 until you start getting some overloading. At least you can find your answer without frying anything and some folks find QRP lots of fun. Maybe you will too! Willis 'Cookie' Cooke, TDXS DX Chairman K5EWJ Trustee N5BPS, USS Cavalla, USS Stewart From: George Thornton gthorn...@thorntonmostullaw.com To: 'elecraft @ mailman . qth . net' elecraft@mailman.qth.net Sent: Tuesday, February 11, 2014 5:36 PM Subject: Re: [Elecraft] Antenna question This might be a stupid question, but here goes. I have a small lot. I currently am using a 3 element Yagi that barely fits on the property. I was thinking about getting a vertical as a second HF antenna. If I put it up it is going to have to be pretty close to the Yagi. I have a dual receive K3. If I have both receivers going, one on each channel, and I broadcast on one of these antennas, am I in any danger of overloading and frying the other receiver? __ 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 Won't power on
Jeremy, One afterthought -- although Q7 and Q8 are the top suspects for your problem, after removing them, check the resistance from the Q7/Q8 collector solder pads to ground. If it is still low, the problem is something other than Q7 and Q8. 73, Don W3FPR --- Jeremy, OK, Q7 and Q8 are 'toast', you might as well remove them. With Q7 and Q8 removed, do a TUNE and measure the DC voltage at the solder pads for the base of Q7 and Q8. The expected voltage is 0.60 to 0.64 volts. If it is out of that range, replace Q11 and Q13 too. Those transistors come included in the K2PAKIT. 73, Don W3FPR On 2/11/2014 8:47 PM, JeremyJones wrote: Q7 and Q8 both read 12.3 ohms from collector to ground. The symptoms definitely resemble blown finals, as I experienced the same thing when I was building the kit, including the over current tripping the resettable fuse. I just didn't expect that from a receive only condition. Jeremy VA3ZTF __ 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] PSK31 AND PSK63
I do not know how and why this thread turned into someting different but the original question was- is Elecraft going to do FW upgrade to add PSK63 to the mix of modes KX3 and K3 already have? PSK63 is getting very popular and I would be happy to have it coded and decoded by KX3 (and K3). 73, Igor UA9CDC __ 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] PSK31 AND PSK63
Yes, it's on the wish-list for both the K3 and KX3. 73, Wayne N6KR On Feb 11, 2014, at 7:45 PM, Igor Sokolov ua9...@gmail.com wrote: I do not know how and why this thread turned into someting different but the original question was- is Elecraft going to do FW upgrade to add PSK63 to the mix of modes KX3 and K3 already have? PSK63 is getting very popular and I would be happy to have it coded and decoded by KX3 (and K3). 73, Igor UA9CDC __ 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] OT - MFJ=1621
Does anyone have any experience/comments on MFJ-1621 antenna in an apartment setting? 73 de Dave KJ6CBS __ 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] Antenna question
On 2/11/2014 3:36 PM, George Thornton wrote: I have a small lot. I currently am using a 3 element Yagi that barely fits on the property. I was thinking about getting a vertical as a second HF antenna. As it happens, over the past year or so I've been engaged in a serious modeling study that compares the performance of vertical and horizontal antennas at mounting heights that are practical for hams in your situation. So the real question is, what will that vertical add to your station beside a second antenna for SO2R? If I were in your situation, I would add an antenna only to cover bands that the tri-bander does not. Even the best vertical is unlikely to outperform the tribander unless you happen to be blessed with REALLY good ground conductivity, and even then only by a dB or so at low elevation angles. Second, if I were to add a vertical, it would be one that is configured as a center-fed dipole, and I would add it ONLY if I could elevate it at least 20 ft. Yes, I know this wasn't the question you asked, but it needs to be asked and answered. :) Also, by all means pay attention to K6DGW's comments, with which I completely concur. There's a link to a presentation I did last fall of the vertical height issue, and also one about the recently popular 43 ft vertical. http://k9yc.com/publish.htm I'm still working on the comparison of verticals to horizontal antennas -- I've done all the modeling and know the results, but haven't organized it to show yet. AD5X has also done some excellent work on the 43 ft vertical idea. And QST recently published a piece showing that a better use of a 43 ft vertical might be as the center support for horizontal dipoles for 80 and 40, a concept with which I strongly agree. :) 73, Jim K9YC __ 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
