Re: WHY HIGH RF OUTPUT???
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What is your corresponding dc voltage and current?
Is your dummy load 50 ohm? About 18 amperes is what you would expect at 100 watts RF out. 73 Roger K7SJ K3 #75 -----Original Message----- From: [hidden email] [mailto:[hidden email]]On Behalf Of JIM DAVIS Sent: Thursday, February 05, 2009 3:58 PM To: [hidden email] Subject: [Elecraft] WHY HIGH RF OUTPUT??? Gentlemen, As measured on a "BIRD TRU-LINE (Mod43) with a 250w. slug our RF out from our K3 is: 80m: 180w. 40m: 150w. WHY??? I ask this because our WATT METER is a accurate device and no one can dispute its accuracy!!! Regards, Jim/nn6ee ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html -- I am using the free version of SPAMfighter. We are a community of 5.9 million users fighting spam. SPAMfighter has removed 53 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len The Professional version does not have this message ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Jim,
Did you perform the TXG calibration process on all bands at exactly 5 and 50 watts? What are you doing when taking the readings -- using the TUNE buttone (not ANT TUNE)? ------------------------- 73, Greg - AB7R Whidbey Island WA NA-065 On Thu Feb 5 16:07 , "Roger Stein" sent: >What is your corresponding dc voltage and current? >Is your dummy load 50 ohm? > >About 18 amperes is what you would expect at 100 watts RF out. > >73 Roger K7SJ >K3 #75 > >-----Original Message----- >From: [hidden email] >[[hidden email]','','','')">[hidden email]]On Behalf Of JIM DAVIS >Sent: Thursday, February 05, 2009 3:58 PM >To: [hidden email] >Subject: [Elecraft] WHY HIGH RF OUTPUT??? > > >Gentlemen, > >As measured on a "BIRD TRU-LINE (Mod43) with a 250w. slug our RF out from our K3 is: > >80m: 180w. >40m: 150w. > >WHY??? > >I ask this because our WATT METER is a accurate device and no one can dispute its accuracy!!! > >Regards, > >Jim/nn6ee > > > > > > > > > > > >______________________________________________________________ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: [hidden email]','','','')">[hidden email] > >This list hosted by: http://www.qsl.net >Please help support this email list: http://www.qsl.net/donate.html > >-- >I am using the free version of SPAMfighter. >We are a community of 5.9 million users fighting spam. >SPAMfighter has removed 53 of my spam emails to date. >Get the free SPAMfighter here: http://www.spamfighter.com/len > >The Professional version does not have this message > >______________________________________________________________ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: [hidden email]','','','')">[hidden email] > >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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Roger Stein-2
Just downloaded HRD and it controls the radio just fine, HOWEVER, there is no CAT connection when the radio is off rendering HRD useless from a remote location.
Anyone know how to remotely turn on the K3 from the desktop? (I use logmein to see it). Don N1DG ----------------------------------------------------- N1DG--Licensed since 1962 EX-WB2DND, A61AD (GUEST OP, QSL MGR), A52DG, /KH9, /BV, /VS6, /4X, /9V Pilot: VU7RG, 3Y0X, VK9ML, D68C, VK0IR, K8XP/KH9, 9M0C, ZK1XXP, ZL9CI Webmaster: BS7H, 3Y0X, K5K, A52A, VK0IR, 9M0C, ZK1XXP, WB2DND/KH9, BQ9P, ZL9CI QSL Manager: A61AD, A61AO, A61X, A61AQ 2006 inductee into the CQ Magazine DX Hall of Fame Member: FOC, ARRL, DDXA, YCCC SKYPE: aurumtel Please consider the environment before printing this email ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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You need a computer-controlled contact closure from the POWER_ON line
(ACC jack) to ground to turn power ON. To turn power OFF cleanly, first send "PS0;" from the computer, wait a second, then turn power off by releasing the ground on POWER_ON. This is described in the owner's manual under "remote control". 73, Wayne N6KR On Feb 5, 2009, at 6:19 PM, Don Greenbaum wrote: > Just downloaded HRD and it controls the radio just fine, HOWEVER, > there is no CAT connection when the radio is off rendering HRD useless > from a remote location. > > Anyone know how to remotely turn on the K3 from the desktop? (I use > logmein to see it). > > Don > N1DG > > ----------------------------------------------------- > N1DG--Licensed since 1962 > EX-WB2DND, A61AD (GUEST OP, QSL MGR), A52DG, /KH9, /BV, /VS6, /4X, /9V > Pilot: VU7RG, 3Y0X, VK9ML, D68C, VK0IR, K8XP/KH9, 9M0C, ZK1XXP, ZL9CI > Webmaster: BS7H, 3Y0X, K5K, A52A, VK0IR, 9M0C, ZK1XXP, WB2DND/KH9, > BQ9P, ZL9CI > QSL Manager: A61AD, A61AO, A61X, A61AQ > 2006 inductee into the CQ Magazine DX Hall of Fame > Member: FOC, ARRL, DDXA, YCCC > > SKYPE: aurumtel > > > Please consider the environment before printing this email > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > --- http://www.elecraft.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Don Greenbaum
Don,
Wayne has the answer on how to turn the K3 off via remote control. Are you going to operate the K3 in the shack, or at a remote base? If a remote base, there are other items you should look at. The number one guarantee is that something will lock up. I had an old Windows 2000 PC with too little memory, and it locked up on me with HRD DM-780 transmitting PSK on 6 meters. At 50 watts. It took me 45 minutes to get to the site. The K3 was just fine. Course, the remote shack was at 20 degrees F ! But at a remote base site, things happen. I Installed a router at the site, that takes a redirected port to an AC power box, a IP Power 9258. One good news/bad news about this box is that it does not remember what state the relays were in if there is a power failure. I have other larger and more expensive units I use at remote broadcast transmitters sites that remember the power state. With the router and this AC box, I can cycle the power to the computer, and to the Astron power supply that feeds the K3. In any remote base location, make sure you modify the BIOS so that the cpu power is in the "last" state. That is, if the cpu is on, and the AC drops, it will power back up. Now, how to get the K3 back on? Been there ;) Buy a cheap parallel port relay board, like this one: http://www.electronickits.com/kit/complete/elec/ck1601.htm . Wire up one of the relays to the remote on pin of the K3. You will find out that most cpu's will trigger all the relays on when you power up, and the relays will stay on, until driven by a program. The really good news is that Simon has a program to control the parallel port in his HRD program. Its called "parallel control"! You can now use those other relays to control antenna relays and the like at the site. And the last thing I installed was a digital Intermatic timer, # DT-17C. Everyday at 2am, I have it drop the power to my remote base rack for 1 minute. This resets the router, which if it locks up, you are in for a long trip. In my case, when the power comes back 1 minute later, the AC controller does not supply power to the computer or the K3 power supply, so they stay off until I command them so via that controller. This works well, keeps the cpu and K3 off when I'm not using it, which keeps the power cost down. (My remote base is at a repeater site, of which a club pays for the power, so we want to keep that power bill down). So I can dial up the site, turn on the K3, and run it using HRD. Works very well. tom K8TB Don Greenbaum wrote: > Just downloaded HRD and it controls the radio just fine, HOWEVER, there is no CAT connection when the radio is off rendering HRD useless from a remote location. > > Anyone know how to remotely turn on the K3 from the desktop? (I use logmein to see it). > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Roger Stein-2
It is a common misconception that Bird Thrulines are a always accurate.
They are good when operated into a matched load and when the signal does not have a high harmonic content. If there is reflected power you need to make a correction. If there are harmonics, even if at a low level, the sensor can read much higher power than is actually present, even into a well matched load. Bird Slugs can become damaged, mechanically or electrically and I have even come across ones with the wrong label. So, I dispute any claim of accuracy of a power meter just because it is a good make. All power meters can on occasion give incorrect readings. The Bird 43 claims 5% of FSD accuracy. On a 250W slug an error of 12W. 180W could, within the meter specification be 170W. Then the 250H slug also has a frequency response. To the problem in hand: The low pass filtering in the K3 should prevent any over-reading being the harmonics, unless there is a problem in the filters and assuming there is not a mis-match, we have to assume this power is real. Specs indicate approx 18A at 13.8V, which is 250W input for 100W output. To get 170W or even 180W output is possible, but I think the PA is unlikely to be linear or long lived if used in this state. If the K3ALC is not working the PA may well develop this much power. I would re-visit the power calibration using the K3 utility. If that fails there is probably a fault. A linear amplifier designed for SSB will normally be capable of much more power than it's linear specification. Quite possibly double on the lower bands where the efficiency may be higher. While the amplifier can produce that power, the device may not survive the extra thermal stress. Mike |
Re: WHY HIGH RF OUTPUT??? (c/o AD6XY)
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On Sat, 7 Feb 2009 02:38:36 -0800 (PST)
AD6XY <[hidden email]> wrote: > > It is a common misconception that Bird Thrulines are a always accurate. > > They are good when operated into a matched load and when the signal does not > have a high harmonic content. If there is reflected power you need to make a > correction. If there are harmonics, even if at a low level, the sensor can > read much higher power than is actually present, even into a well matched > load. Bird Slugs can become damaged, mechanically or electrically and I have > even come across ones with the wrong label. > > So, I dispute any claim of accuracy of a power meter just because it is a > good make. All power meters can on occasion give incorrect readings. > > The Bird 43 claims 5% of FSD accuracy. On a 250W slug an error of 12W. 180W > could, within the meter specification be 170W. Then the 250H slug also has a > frequency response. > > To the problem in hand: > > The low pass filtering in the K3 should prevent any over-reading being the > harmonics, unless there is a problem in the filters and assuming there is > not a mis-match, we have to assume this power is real. > > Specs indicate approx 18A at 13.8V, which is 250W input for 100W output. To > get 170W or even 180W output is possible, but I think the PA is unlikely to > be linear or long lived if used in this state. If the K3ALC is not working > the PA may well develop this much power. I would re-visit the power > calibration using the K3 utility. If that fails there is probably a fault. > > A linear amplifier designed for SSB will normally be capable of much more > power than it's linear specification. Quite possibly double on the lower > bands where the efficiency may be higher. While the amplifier can produce > that power, the device may not survive the extra thermal stress. > > Mike Mike OC, Many, many thanks for a logical/definitive explanation!!! Appreciated it greatly! Jim/ee S/N 2406 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
K60XV Alignment & Test Questions
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I just completed my K60XV, have installed it in my K2 and am going through the Alignment and test procedures.
My voltages check out OK in the 40/60 Metre Alignment section. "Connect an antenna to the K2. While listening to and noise or a weak signal" (your typo, not mine) .... peak the signal by adjusting C1 and C2. I notice no difference when adjusting either of them. Is it a subtle peak or sharp and pronounced? I connect a dummy load and set the power to 2 watts. "Enter TUNE and adjust the two trimmers for maximum power output." -- Well, I can adjust them and get anywhere up to 15 watts out. But I don't think that's what you mean, is it? If you want me to set the power output to 2 watts then I assume I should tune to get about that, shouldn't I? What do you really want me to do here? Thanks in advance for any assistance. 73 - Ken Alexander, VE3HLS ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: K60XV Alignment & Test Questions
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Ken,
The normal procedure uses receive to peak the bandpass filter approximately correct. Then that is followed by using transmit to refine that peak - the fact remains that one can observe the real peak better by watching the transmitted output power than by listening with the ears. So, you did not find a real peak on receive - the result is that the bandpass was not tuned close to optimum when you did the transmit adjustment. No problem, but you can observe the peak better at 2 watts than at 15 watts, so as the power increases, just exit TUNE and enter it again so the power again levels out to 2 watts, tune for a somewhat higher power, and if it goes to more than 5 watts, exit and re-enter tune again. Keep doing that until you find the actual peak within the 2 to 5 watt range, and you are done. BTW, you may want to peak up the inductors for 40 meters before adjusting the caps for 60 meters. 73, Don W3FPR Ken Alexander wrote: > I just completed my K60XV, have installed it in my K2 and am going through the Alignment and test procedures. > > My voltages check out OK in the 40/60 Metre Alignment section. > > "Connect an antenna to the K2. While listening to and noise or a weak signal" (your typo, not mine) .... peak the signal by adjusting C1 and C2. I notice no difference when adjusting either of them. Is it a subtle peak or sharp and pronounced? > > I connect a dummy load and set the power to 2 watts. > > "Enter TUNE and adjust the two trimmers for maximum power output." -- Well, I can adjust them and get anywhere up to 15 watts out. But I don't think that's what you mean, is it? If you want me to set the power output to 2 watts then I assume I should tune to get about that, shouldn't I? What do you really want me to do here? > > Thanks in advance for any assistance. > > 73 - Ken Alexander, VE3HLS > > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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