Re: [Elecraft] KPA-1500 Power Output Variation
Here’s a way to get a worst case estimate of the effect of SWR on power output. Assume the amplifier has constant VOLTAGE gain and an output impedance much smaller than 50 Ohms. A 1.3:1 SWR means the load impedance could be as low as 39 Ohms or as high as 65 Ohms. Let’s say the SWR is 1:1 at the frequency at which the drive is set for 1500 W output. Then you tune to where the SWR is 1.3:1. At that SWR, the output could be anything from 1150 to 1950 W. The range may be less, as the amplifier output impedance may not be all that low compared to 50 Ohms. In any case, this shows that the power output of a solid state amplifier may be very sensitive to load SWR. This is why the KPA1500 ATU really needs to be able to keep the SWR low. The recently improved autotune firmware does this very well, if you “train” it across the band. It is also why it’s important to use the ATU, even if the antenna SWR is “only”, say, 1.5:1. I keep hoping Elecraft will come up with a way to automatically adjust drive power to maintain constant output. That would also compensate for change in temperature. 73, Scott K9MA -- Scott Ellington --- via iPad > On Aug 24, 2019, at 1:45 PM, Jim McCook wrote: > > I'm using my K-3 with the KPA-1500 and have a problem with extreme changes in > power output with a given drive level on 40m CW. This happens to a lesser > extent on other bands with different antennas. My 40m antenna is tuned to > 7.025 where SWR is 1.1:1. On 7.000 it is 1.4:1 and at 7.050 it's 1.3:1. > Within that range of frequencies the output _without_ the tuner at a given > drive level (30w) varies from 1300w to well over 1700w. Using careful > _tuner_ settings it's only slightly better. I have to reduce drive to 24 or > 25w to get below 1500w, depending on the temperature of the amplifier (power > output varies a lot with temperature changes). Higher temp = lower output. > > I have tried to compensate in the segments where output is excessive by using > manual settings via the Utility. This has helped slightly, but still isn't > adequate. I've resisted using ALC because of concern for generating > distortion. Having to ride the drive level from the K-3 is a PIA, especially > during contests. > > It seems to me a good answer would be to have higher input attenuation so > drive requirement would be higher, maybe around 70+ watts. I'd expect > changing drive level by the same number of watts (5 or 6) would not affect > output as much. I'd also assume the power output would not vary nearly so > much with a given drive level. > > Is this a possible solution? I've also understood that most transmitters > (even the K-3) have cleaner output near highest rated output. > > Help! > > Jim W6YA > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to k...@sdellington.us __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Elecraft CW Net Announcement
Good Evening, I got to watch a logger fall a very large tree exactly where he said it would land. He laid it down between two long rows of trees with only a few live limbs broken. After he left I got out my long tape and a shorter one just in case. Laying down made it much easier to measure. At 120 feet I wasn't sure which was one tree and which trunk was from another. The stump measures 44 inches in diameter. I limbed it up to about 80 feet before I tried bucking it. Lower than that will take multiple cuts from my 20 inch saw to free each round. My antenna tree had 60 very good years before it died a sudden death. Each growth ring was between 1/4 and 3/8 of an inch in width until its last few years. I have yet to find any damage consistent with its passing. Now I have one very large chunk of wood blocking the deer paths. If it is all seasoned it would heat the house for a full winter. It's been dead for over two years but the lower part may still be a bit too green to burn. Luckily there are plenty of other trees ready to go. It took a few hours of placing and replacing a line but finally I got one which worked. I checked the old antenna and found it intact so I raised it back into place. One leg got tangled so I had to pull it, unwrap it, and the put it back into position. While taking down both antennas I found better routes and replaced each of three legs higher than they were before. The fourth leg went back to pretty much the same place as before. Scanning 80, 40, and 20 meters gathered a few calls around the US, a few in Canada, and few in Eastern Europe. Please join us on: 14050 kHz at 2200z Sunday (3 PM PDT Sunday) 7047 kHz at z Monday (5 PM PDT Sunday) 73, Kevin. KD5ONS _ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KPA500 attenuator rating
Eric, I have taken, perhaps obsessive, precautions to ensure that my KPA500 is not damaged by operator error. I don't expect to ever trip the attenuator in my station. However, I don't see anything in the documentation that imposes a limit on the amount of time that the KPA500 could be driven with power that trips the attenuator. As an example - assume 30 W gives 500 W out and the antenna load is well matched. Now I increase drive to 60 W. The attenuator trips and the KPA500 is back to 30 W drive and a well matched load. What causes the firmware to progress to a hard fault to protect the attenuator resistor? Thanks and 73, Andy, k3wyc From: Eric Swartz - WA6HHQ, Elecraft Sent: Saturday, August 24, 2019 4:37 PM To: Andy Durbin Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA-1500 Power Output Variation The internal attenuator is only rated for short term usage in cases of over drive or high reflected power. Any hw modification forcing it on will risk damage to the input attenuator components. 73, Eric elecraft.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Fw: Fw: PX3 Keyboards
If you are into it, and want to avoid a full fledged keyboard, I have added an external keypad to my P3, and have 64 macros I can fire at a single button press... See: https://www.nk7z.net/adding-external-keypad-k3/ 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Technical Specialist ARRL Volunteer Examiner ARRL Asst. Director, NW Division, Technical Resources On 8/24/19 6:15 PM, Bob Gibson via Elecraft wrote: SR MINI Keyboards are sold here in the states also... 73s Bob W5RG - Forwarded Message - From: Bob Gibson via Elecraft To: Elecraft Reflector Sent: Saturday, August 24, 2019, 8:12:14 PM CDTSubject: [Elecraft] Fw: PX3 Keyboards I found one on e-bay called a SR MINI Keyboard wired..it works great and it is small..there are a few on e-bay now just look up SK MINI Keyboard..they sell for about $15-$20. from China 73s Bob W5RG - Forwarded Message - From: Gwen Patton To: Elecraft Sent: Saturday, August 24, 2019, 7:31:00 PM CDTSubject: Re: [Elecraft] PX3 Keyboards I got 2.4ghz Amazon Basics keyboard for it. I tried a wired keyboard, and while it was a nice keyboard, RF kept getting into the keyboard buffer no matter what I did. I tried toroids, chokes, you name it. It'd start shoving spurious noise into the character stream, keeping it from finishing in PSK or CW mode. When I switched to a 2.4ghz model, it works perfectly. Don't use Bluetooth, as there's no way to enter the pairing code, so it won't work. This is the one I got: https://www.amazon.com/gp/product/B0787G1YFG 73, Gwen, NG3P On Sat, Aug 24, 2019 at 8:09 PM Grant Youngman wrote: Don’t know what happened to the list. Keyboard models change so frequently it probably got to be a mess to keep up with it. This Logitech is a Bluetooth keyboard. Last I saw something about it, bluetooth wouldn’t work because it needed a PC BIOS to make the connection. I use an Anker 2.4GHz wireless keyboard that works fine. It comes with the wireless/USB adapter that stores in the keyboard battery compartment. There are several types of these around. Grant NQ5T KX3 (8342)/KXPA100 On Aug 24, 2019, at 7:12 PM, John Hendricks wrote: Does anyone know if the Logitech K380 keyboard works with the PX3. Can not find a current list on the Elecraft site. John 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 Message delivered to ghyoung...@gmail.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 Message delivered to ard...@gmail.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 Message delivered to arch...@mail-archive.com
[Elecraft] Fw: Fw: PX3 Keyboards
SR MINI Keyboards are sold here in the states also... 73s Bob W5RG - Forwarded Message - From: Bob Gibson via Elecraft To: Elecraft Reflector Sent: Saturday, August 24, 2019, 8:12:14 PM CDTSubject: [Elecraft] Fw: PX3 Keyboards I found one on e-bay called a SR MINI Keyboard wired..it works great and it is small..there are a few on e-bay now just look up SK MINI Keyboard..they sell for about $15-$20. from China 73s Bob W5RG - Forwarded Message - From: Gwen Patton To: Elecraft Sent: Saturday, August 24, 2019, 7:31:00 PM CDTSubject: Re: [Elecraft] PX3 Keyboards I got 2.4ghz Amazon Basics keyboard for it. I tried a wired keyboard, and while it was a nice keyboard, RF kept getting into the keyboard buffer no matter what I did. I tried toroids, chokes, you name it. It'd start shoving spurious noise into the character stream, keeping it from finishing in PSK or CW mode. When I switched to a 2.4ghz model, it works perfectly. Don't use Bluetooth, as there's no way to enter the pairing code, so it won't work. This is the one I got: https://www.amazon.com/gp/product/B0787G1YFG 73, Gwen, NG3P On Sat, Aug 24, 2019 at 8:09 PM Grant Youngman wrote: > Don’t know what happened to the list. Keyboard models change so > frequently it probably got to be a mess to keep up with it. > > This Logitech is a Bluetooth keyboard. Last I saw something about it, > bluetooth wouldn’t work because it needed a PC BIOS to make the connection. > > I use an Anker 2.4GHz wireless keyboard that works fine. It comes with > the wireless/USB adapter that stores in the keyboard battery compartment. > There are several types of these around. > > Grant NQ5T > KX3 (8342)/KXPA100 > > > > On Aug 24, 2019, at 7:12 PM, John Hendricks > wrote: > > > > Does anyone know if the Logitech K380 keyboard works with the PX3. Can > not > > find a current list on the Elecraft site. > > > > John 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 > > Message delivered to ghyoung...@gmail.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 > Message delivered to ard...@gmail.com -- -+-+-+-+- Jenny Everywhere's Infinite: Quark Time http://quarktime.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w...@yahoo.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 Message delivered to w...@yahoo.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 Message delivered to arch...@mail-archive.com
[Elecraft] Fw: PX3 Keyboards
I found one on e-bay called a SR MINI Keyboard wired..it works great and it is small..there are a few on e-bay now just look up SK MINI Keyboard..they sell for about $15-$20. from China 73s Bob W5RG - Forwarded Message - From: Gwen Patton To: Elecraft Sent: Saturday, August 24, 2019, 7:31:00 PM CDTSubject: Re: [Elecraft] PX3 Keyboards I got 2.4ghz Amazon Basics keyboard for it. I tried a wired keyboard, and while it was a nice keyboard, RF kept getting into the keyboard buffer no matter what I did. I tried toroids, chokes, you name it. It'd start shoving spurious noise into the character stream, keeping it from finishing in PSK or CW mode. When I switched to a 2.4ghz model, it works perfectly. Don't use Bluetooth, as there's no way to enter the pairing code, so it won't work. This is the one I got: https://www.amazon.com/gp/product/B0787G1YFG 73, Gwen, NG3P On Sat, Aug 24, 2019 at 8:09 PM Grant Youngman wrote: > Don’t know what happened to the list. Keyboard models change so > frequently it probably got to be a mess to keep up with it. > > This Logitech is a Bluetooth keyboard. Last I saw something about it, > bluetooth wouldn’t work because it needed a PC BIOS to make the connection. > > I use an Anker 2.4GHz wireless keyboard that works fine. It comes with > the wireless/USB adapter that stores in the keyboard battery compartment. > There are several types of these around. > > Grant NQ5T > KX3 (8342)/KXPA100 > > > > On Aug 24, 2019, at 7:12 PM, John Hendricks > wrote: > > > > Does anyone know if the Logitech K380 keyboard works with the PX3. Can > not > > find a current list on the Elecraft site. > > > > John 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 > > Message delivered to ghyoung...@gmail.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 > Message delivered to ard...@gmail.com -- -+-+-+-+- Jenny Everywhere's Infinite: Quark Time http://quarktime.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w...@yahoo.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
That's not the point at all. It's about having to ride the drive level control on the K-3 constantly, especially in a contest, to avoid sudden output of 1700w. Why worry about it? No one on the other end would be able to tell one bit of difference. I see power drop -- maybe 5 - 10 percent -- as the KPA1500 heats up...likely normal. The small bit of reflected power may also have some minor effect on the wattmeter readings you see as well. 73, Greg-N4CC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
Dummy load is no problem and never has been. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
What about a dummy load? Sent from my iPhone ...nr4c. bill > On Aug 24, 2019, at 7:56 PM, Jim McCook wrote: > > Eric, > > If the attenuator had more attenuation that caused the drive to be closer to > the K-3 output I would think this would reduce the sensitivity of the drive > level with respect to change in power output. 6w change in drive (from a > larger input attenuator) from 80w would result in less output change (with > the smaller attenuator) than with 6w change from 30w. Is this right? > > Jack, > > When I change to the tube amp I use all the same cables and connectors for > RF. None of the problem occurs. I have tried substituting cables. I have > not substituted the feedline of the 40m antenna, though. > > Jim > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to n...@widomaker.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
Why worry about it? No one on the other end would be able to tell one bit of difference. I see power drop -- maybe 5 - 10 percent -- as the KPA1500 heats up...likely normal. The small bit of reflected power may also have some minor effect on the wattmeter readings you see as well. 73, Greg-N4CC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] PX3 Keyboards
I got 2.4ghz Amazon Basics keyboard for it. I tried a wired keyboard, and while it was a nice keyboard, RF kept getting into the keyboard buffer no matter what I did. I tried toroids, chokes, you name it. It'd start shoving spurious noise into the character stream, keeping it from finishing in PSK or CW mode. When I switched to a 2.4ghz model, it works perfectly. Don't use Bluetooth, as there's no way to enter the pairing code, so it won't work. This is the one I got: https://www.amazon.com/gp/product/B0787G1YFG 73, Gwen, NG3P On Sat, Aug 24, 2019 at 8:09 PM Grant Youngman wrote: > Don’t know what happened to the list. Keyboard models change so > frequently it probably got to be a mess to keep up with it. > > This Logitech is a Bluetooth keyboard. Last I saw something about it, > bluetooth wouldn’t work because it needed a PC BIOS to make the connection. > > I use an Anker 2.4GHz wireless keyboard that works fine. It comes with > the wireless/USB adapter that stores in the keyboard battery compartment. > There are several types of these around. > > Grant NQ5T > KX3 (8342)/KXPA100 > > > > On Aug 24, 2019, at 7:12 PM, John Hendricks > wrote: > > > > Does anyone know if the Logitech K380 keyboard works with the PX3. Can > not > > find a current list on the Elecraft site. > > > > John 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 > > Message delivered to ghyoung...@gmail.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 > Message delivered to ard...@gmail.com -- -+-+-+-+- Jenny Everywhere's Infinite: Quark Time http://quarktime.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
On 8/24/2019 2:40 PM, Wes wrote: Jim I don't have a KPA1500, but do have a KPA500. I'm not particularly surprised at your observations based on mine with the '500. After a recent thread about amplifier efficiency I ran some tests on mine, using a well characterized dummy load and an LP-100A wattmeter, at rated output. I've had my KPA1500 for only a few months, and 99% of my operation has been on 6M. I also have an LP100A inline, calibrated at their factory. On 6M, with the tuner bypassed, The LP100A regularly reads about 100W (0.3 dB) lower than KPA1500 on keydown transmissions, and the LP100A reads about 1.8:1 SWR. The KPA1500 indicates 1.3:1 - 1.1:1 SWR (depending on the weather). If I engage the tuner, output power as read by the LP100A drops by 100W or so, indicating loss on the order of 0.3 dB in the tuner. How could this be? Simple. There are a relay, two UHF connector junctions, and 6-8 ft of RG400 (0.2 dB @ 50 MHz) between the LP100A and the output of the KPA1500. The connectors each contribute a bit of mismatch at 50 MHz, and the length of coax is transforming the load that the amp sees, so the LP100A and the KPA1500 are measuring both power and VSWR at different points. Power accuracy of the LP100A is 5% (0.21 dB) worst case, 3% (0.13 dB) typical, and the power reading compensates for mismatch. It can read average, peak, and peak hold. The point of all this is that, when you're trying to see small differences, there are a lot of little things that can add errors or make you think something is wrong when there isn't. :) 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] PX3 Keyboards
Don’t know what happened to the list. Keyboard models change so frequently it probably got to be a mess to keep up with it. This Logitech is a Bluetooth keyboard. Last I saw something about it, bluetooth wouldn’t work because it needed a PC BIOS to make the connection. I use an Anker 2.4GHz wireless keyboard that works fine. It comes with the wireless/USB adapter that stores in the keyboard battery compartment. There are several types of these around. Grant NQ5T KX3 (8342)/KXPA100 > On Aug 24, 2019, at 7:12 PM, John Hendricks wrote: > > Does anyone know if the Logitech K380 keyboard works with the PX3. Can not > find a current list on the Elecraft site. > > John 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 > Message delivered to ghyoung...@gmail.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
Eric, If the attenuator had more attenuation that caused the drive to be closer to the K-3 output I would think this would reduce the sensitivity of the drive level with respect to change in power output. 6w change in drive (from a larger input attenuator) from 80w would result in less output change (with the smaller attenuator) than with 6w change from 30w. Is this right? Jack, When I change to the tube amp I use all the same cables and connectors for RF. None of the problem occurs. I have tried substituting cables. I have not substituted the feedline of the 40m antenna, though. Jim __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
The internal attenuator is only rated for short term usage in cases of over drive or high reflected power. Any hw modification forcing it on will risk damage to the input attenuator components. 73, Eric elecraft.com _..._ > On Aug 24, 2019, at 3:21 PM, Andy Durbin wrote: > > "I believe that additional attenuation might be helpful if you can implement > it without upsetting the RX path, although on most bands 2 or 3 dB extra > attenuation wouldn't matter." > > Both the KPA500 and KPA1500 have built in drive attenuators (3 dB for KAT500, > KPA1500 unknown) but there seems to be no serial command to activate them > (only control is internal for over-drive protection). It would seem to be a > fairly simple firmware change to allow the user to activate the attenuator > but that would remove a layer of protection from accidental over-drive. > > Anyone willing to make a (minor?) hardware mod could activate the built in > drive attenuator without impacting the RX signal path. > > Like Wes, I'm not surprised he KPA1500 is sensitive to load. I am surprised > that sensitivity is still seen when the load is matched by the internal tuner. > > 73, > Andy, k3wyc > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to eric.swa...@elecraft.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
Jack, Thanks for the idea. I've not checked power in the drive line from the K-3. However, when running the K-3 barefoot with the amp on or off at any power level I see none of these power changes in the K-3 output. Other than my previous comment about drive levels, I have to wonder if it has to do with tuner firmware in the KPA-1500. If nobody else is seeing a similar problem, there must be something before or after the amp that creates the problem. 73, Jim __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
Jim; It would be interesting to see the source of the variance. You might insert the Bird between the transceiver and the KPA to see if there is any variance there. The amplifier has fixed gain - it has no ability to vary its gain during transmission other than a protective pad that is inserted when problems are detected. The power is not changing enough for that to be indicated, which makes me wonder just where the actual variance comes from. 73! Jack, W6FB > On Aug 24, 2019, at 3:58 PM, Jim McCook wrote: > > Don, > > I'm seeing the power changes on the front panel of the amp, on the Utility, > and on the Bird external to the amplifier. The Bird 2500w slug is about 40 > years old, so it probably needs recalibrating. Still, I can see the relative > differences at all 3 spots. There is no fault in the amp when it hits the > high power level around 1700w. > > My attenuator idea was to put it at the input of the transmit section of the > amp, out of the receive line. in the same place as the built in > attenuator. It still seems to me it would help for reasons I mentioned > before. With low drive levels the output is most sensitive to relatively > small changes in drive. I think the idea of running the K-3 closer to rated > output is still desirable. > > Thanks, guys, for all the input. > > Jim W6YA > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to jackbrin...@me.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 Message delivered to arch...@mail-archive.com
[Elecraft] PX3 Keyboards
Does anyone know if the Logitech K380 keyboard works with the PX3. Can not find a current list on the Elecraft site. John 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
Don, I'm seeing the power changes on the front panel of the amp, on the Utility, and on the Bird external to the amplifier. The Bird 2500w slug is about 40 years old, so it probably needs recalibrating. Still, I can see the relative differences at all 3 spots. There is no fault in the amp when it hits the high power level around 1700w. My attenuator idea was to put it at the input of the transmit section of the amp, out of the receive line. in the same place as the built in attenuator. It still seems to me it would help for reasons I mentioned before. With low drive levels the output is most sensitive to relatively small changes in drive. I think the idea of running the K-3 closer to rated output is still desirable. Thanks, guys, for all the input. Jim W6YA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KPA-1500 Power Output Variation
"I believe that additional attenuation might be helpful if you can implement it without upsetting the RX path, although on most bands 2 or 3 dB extra attenuation wouldn't matter." Both the KPA500 and KPA1500 have built in drive attenuators (3 dB for KAT500, KPA1500 unknown) but there seems to be no serial command to activate them (only control is internal for over-drive protection). It would seem to be a fairly simple firmware change to allow the user to activate the attenuator but that would remove a layer of protection from accidental over-drive. Anyone willing to make a (minor?) hardware mod could activate the built in drive attenuator without impacting the RX signal path. Like Wes, I'm not surprised he KPA1500 is sensitive to load. I am surprised that sensitivity is still seen when the load is matched by the internal tuner. 73, Andy, k3wyc __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
Thank you, Jim. That is more helpful. I use a remote tuner rather than using the built in for matching. Thus my situation would not match yours. I use a 350 loop on 40 meters, thus I would not be helpful in your situation. Using a tube amp is much different in matching versus the solid state amplifier as I remember when I last used a tube amp. I believe your specifics will now lead to a better answer to your situation. 73, Bill K9YEQ https://wrj-tech.com/ -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Jim McCook Sent: Saturday, August 24, 2019 2:58 PM To: Elecraft Reflector Subject: [Elecraft] KPA-1500 Power Output Variation Antenna is 2 el. delta. Uses 1/4 wave 70 ohm matching section. Described in ON4UN's Low Band DXing. Used for 38 years with various tube amplifiers and no tuners. All coax has been replaced as recently as 10 years ago. SWR measurements always similar. Power output with tube amps does not vary visibly on a Bird WM. Same situation currently with a tube amp substituted. Feedline from matching section about 50 ft. I know how to match antennas.:-) I have seen the usual reactance measurement on each side of design frequency of 7.025. The built in tuner is the one I was referencing. The KPA-1500 comes with one. Jim __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k9...@live.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
Jim I don't have a KPA1500, but do have a KPA500. I'm not particularly surprised at your observations based on mine with the '500. After a recent thread about amplifier efficiency I ran some tests on mine, using a well characterized dummy load and an LP-100A wattmeter, at rated output. Although I only tested at the bottom of each band, I observed a variation in efficiency of a bit under 55% at 21 MHz to 75% at 3.5 MHz. The gain varied from 12.7 dB to 15.8 dB over the HF range (excluding 50 MHz) Additionally, I see power jitter of several watts. In past two-tone IMD testing I've seen the spectrum break up due to (according to headquarters) the K3 ALC loop hunting. As you no doubt have noticed adjusting output power by tweaking the input power isn't a smooth operation either. In short, this combination is anything but stable. I believe that additional attenuation might be helpful if you can implement it without upsetting the RX path, although on most bands 2 or 3 dB extra attenuation wouldn't matter. Wes N7WS On 8/24/2019 11:45 AM, Jim McCook wrote: I'm using my K-3 with the KPA-1500 and have a problem with extreme changes in power output with a given drive level on 40m CW. This happens to a lesser extent on other bands with different antennas. My 40m antenna is tuned to 7.025 where SWR is 1.1:1. On 7.000 it is 1.4:1 and at 7.050 it's 1.3:1. Within that range of frequencies the output _without_ the tuner at a given drive level (30w) varies from 1300w to well over 1700w. Using careful _tuner_ settings it's only slightly better. I have to reduce drive to 24 or 25w to get below 1500w, depending on the temperature of the amplifier (power output varies a lot with temperature changes). Higher temp = lower output. I have tried to compensate in the segments where output is excessive by using manual settings via the Utility. This has helped slightly, but still isn't adequate. I've resisted using ALC because of concern for generating distortion. Having to ride the drive level from the K-3 is a PIA, especially during contests. It seems to me a good answer would be to have higher input attenuation so drive requirement would be higher, maybe around 70+ watts. I'd expect changing drive level by the same number of watts (5 or 6) would not affect output as much. I'd also assume the power output would not vary nearly so much with a given drive level. Is this a possible solution? I've also understood that most transmitters (even the K-3) have cleaner output near highest rated output. Help! Jim W6YA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
I just did some experiments with my K3/KPA1500 combo into a dummy load. I used my LP-700 for power measurements. Drive from K3 was set to 30W (28 on K3 indication). I started at 35C with PO at 1362 watts. At 70C, the PO dropped to 1277 watts...about a 6% decrease. K3 output remained steady at 30W. What we need is someone with a separate tuner that can set up loads greater and lesser than 50 Ohms and with Xc and Xl components. We may find greater output with loads less than 50 Ohms and/or loads with Xl rather than Xc. This is one of the disadvantages of having a fixed output network. With the old AL-1200, I could just tune for max smoke and set the drive accordingly! 73, Roger On 8/24/2019 2:45 PM, Jim McCook wrote: I'm using my K-3 with the KPA-1500 and have a problem with extreme changes in power output with a given drive level on 40m CW. This happens to a lesser extent on other bands with different antennas. My 40m antenna is tuned to 7.025 where SWR is 1.1:1. On 7.000 it is 1.4:1 and at 7.050 it's 1.3:1. Within that range of frequencies the output _without_ the tuner at a given drive level (30w) varies from 1300w to well over 1700w. Using careful _tuner_ settings it's only slightly better. I have to reduce drive to 24 or 25w to get below 1500w, depending on the temperature of the amplifier (power output varies a lot with temperature changes). Higher temp = lower output. I have tried to compensate in the segments where output is excessive by using manual settings via the Utility. This has helped slightly, but still isn't adequate. I've resisted using ALC because of concern for generating distortion. Having to ride the drive level from the K-3 is a PIA, especially during contests. It seems to me a good answer would be to have higher input attenuation so drive requirement would be higher, maybe around 70+ watts. I'd expect changing drive level by the same number of watts (5 or 6) would not affect output as much. I'd also assume the power output would not vary nearly so much with a given drive level. Is this a possible solution? I've also understood that most transmitters (even the K-3) have cleaner output near highest rated output. Help! Jim W6YA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to n...@roadrunner.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
I'm sorry but I don't think Jim deserves a condescending lesson on antennas. Wes N7WS On 8/24/2019 12:39 PM, Bill Johnson wrote: Seeing a 1.1:1.0 SWR at the amplifier doesn't necessarily mean your antenna is working as you expect. Without getting into details, I am sure others will chime in, your antenna setup is highly suspicious given what you have briefly reported. You didn't indicate antenna type, feedline, feedline distance, etc. You might find reading an antenna handbook very informative. You can also YouTube or do on line searches to learn about antenna matching. As a KPA1500 owner, my antenna setup doesn't give me anything close to what you are experiencing. Are you using the built in tuner? Have you used an antenna analyzer to determine the antenna's characteristics on the frequencies you included in your questioning? 73, Bill K9YEQ https://wrj-tech.com/ -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Jim McCook Sent: Saturday, August 24, 2019 1:45 PM To: Elecraft Reflector Subject: [Elecraft] KPA-1500 Power Output Variation I'm using my K-3 with the KPA-1500 and have a problem with extreme changes in power output with a given drive level on 40m CW. This happens to a lesser extent on other bands with different antennas. My 40m antenna is tuned to 7.025 where SWR is 1.1:1. On 7.000 it is 1.4:1 and at 7.050 it's 1.3:1. Within that range of frequencies the output _without_ the tuner at a given drive level (30w) varies from 1300w to well over 1700w. Using careful _tuner_ settings it's only slightly better. I have to reduce drive to 24 or 25w to get below 1500w, depending on the temperature of the amplifier (power output varies a lot with temperature changes). Higher temp = lower output. I have tried to compensate in the segments where output is excessive by using manual settings via the Utility. This has helped slightly, but still isn't adequate. I've resisted using ALC because of concern for generating distortion. Having to ride the drive level from the K-3 is a PIA, especially during contests. It seems to me a good answer would be to have higher input attenuation so drive requirement would be higher, maybe around 70+ watts. I'd expect changing drive level by the same number of watts (5 or 6) would not affect output as much. I'd also assume the power output would not vary nearly so much with a given drive level. Is this a possible solution? I've also understood that most transmitters (even the K-3) have cleaner output near highest rated output. Help! Jim W6YA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
Jim, It would be informative to know where you are observing the power variation. In the feedline after the KAT1500 with your Bird WM or on the KPA1500 panel display (or the KPA1500 Utility)? 73, Don W3FPR On 8/24/2019 3:58 PM, Jim McCook wrote: Antenna is 2 el. delta. Uses 1/4 wave 70 ohm matching section. Described in ON4UN's Low Band DXing. Used for 38 years with various tube amplifiers and no tuners. All coax has been replaced as recently as 10 years ago. SWR measurements always similar. Power output with tube amps does not vary visibly on a Bird WM. Same situation currently with a tube amp substituted. Feedline from matching section about 50 ft. I know how to match antennas.:-) I have seen the usual reactance measurement on each side of design frequency of 7.025. The built in tuner is the one I was referencing. The KPA-1500 comes with one. Jim __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to donw...@embarqmail.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 Message delivered to arch...@mail-archive.com
[Elecraft] KPA-1500 Power Output Variation
Antenna is 2 el. delta. Uses 1/4 wave 70 ohm matching section. Described in ON4UN's Low Band DXing. Used for 38 years with various tube amplifiers and no tuners. All coax has been replaced as recently as 10 years ago. SWR measurements always similar. Power output with tube amps does not vary visibly on a Bird WM. Same situation currently with a tube amp substituted. Feedline from matching section about 50 ft. I know how to match antennas.:-) I have seen the usual reactance measurement on each side of design frequency of 7.025. The built in tuner is the one I was referencing. The KPA-1500 comes with one. Jim __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Power Output Variation
Seeing a 1.1:1.0 SWR at the amplifier doesn't necessarily mean your antenna is working as you expect. Without getting into details, I am sure others will chime in, your antenna setup is highly suspicious given what you have briefly reported. You didn't indicate antenna type, feedline, feedline distance, etc. You might find reading an antenna handbook very informative. You can also YouTube or do on line searches to learn about antenna matching. As a KPA1500 owner, my antenna setup doesn't give me anything close to what you are experiencing. Are you using the built in tuner? Have you used an antenna analyzer to determine the antenna's characteristics on the frequencies you included in your questioning? 73, Bill K9YEQ https://wrj-tech.com/ -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Jim McCook Sent: Saturday, August 24, 2019 1:45 PM To: Elecraft Reflector Subject: [Elecraft] KPA-1500 Power Output Variation I'm using my K-3 with the KPA-1500 and have a problem with extreme changes in power output with a given drive level on 40m CW. This happens to a lesser extent on other bands with different antennas. My 40m antenna is tuned to 7.025 where SWR is 1.1:1. On 7.000 it is 1.4:1 and at 7.050 it's 1.3:1. Within that range of frequencies the output _without_ the tuner at a given drive level (30w) varies from 1300w to well over 1700w. Using careful _tuner_ settings it's only slightly better. I have to reduce drive to 24 or 25w to get below 1500w, depending on the temperature of the amplifier (power output varies a lot with temperature changes). Higher temp = lower output. I have tried to compensate in the segments where output is excessive by using manual settings via the Utility. This has helped slightly, but still isn't adequate. I've resisted using ALC because of concern for generating distortion. Having to ride the drive level from the K-3 is a PIA, especially during contests. It seems to me a good answer would be to have higher input attenuation so drive requirement would be higher, maybe around 70+ watts. I'd expect changing drive level by the same number of watts (5 or 6) would not affect output as much. I'd also assume the power output would not vary nearly so much with a given drive level. Is this a possible solution? I've also understood that most transmitters (even the K-3) have cleaner output near highest rated output. Help! Jim W6YA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k9...@live.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 Message delivered to arch...@mail-archive.com
[Elecraft] KPA-1500 Power Output Variation
I'm using my K-3 with the KPA-1500 and have a problem with extreme changes in power output with a given drive level on 40m CW. This happens to a lesser extent on other bands with different antennas. My 40m antenna is tuned to 7.025 where SWR is 1.1:1. On 7.000 it is 1.4:1 and at 7.050 it's 1.3:1. Within that range of frequencies the output _without_ the tuner at a given drive level (30w) varies from 1300w to well over 1700w. Using careful _tuner_ settings it's only slightly better. I have to reduce drive to 24 or 25w to get below 1500w, depending on the temperature of the amplifier (power output varies a lot with temperature changes). Higher temp = lower output. I have tried to compensate in the segments where output is excessive by using manual settings via the Utility. This has helped slightly, but still isn't adequate. I've resisted using ALC because of concern for generating distortion. Having to ride the drive level from the K-3 is a PIA, especially during contests. It seems to me a good answer would be to have higher input attenuation so drive requirement would be higher, maybe around 70+ watts. I'd expect changing drive level by the same number of watts (5 or 6) would not affect output as much. I'd also assume the power output would not vary nearly so much with a given drive level. Is this a possible solution? I've also understood that most transmitters (even the K-3) have cleaner output near highest rated output. Help! Jim W6YA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] TX Delay
There used to be a problem with the K3 before the updated synthesizer came out; at just around 30 wpm the keying would start to sound erratic. But with the new synthesizer installed in a K3, or a K3S, there’s no problem at any speed I can send at, even with QRQ mode off. Victor 4X6GP > On 24 Aug 2019, at 16:16, Peter Chamalian wrote: > > Thanks Vic. I put in a query to Elecraft support about it and am awaiting > their reply. > > I may have accidentally put the K3S into QRQ mode but my 35 wpm sending > hardly qualifies as that. > > > Pete, W1RM > w...@comcast.net > > -Original Message- > From: Vic Rosenthal > Sent: Saturday, August 24, 2019 9:11 AM > To: Peter Chamalian > Cc: Elecraft > Subject: Re: [Elecraft] TX Delay > > I haven’t tested it, but I recall that the delay is shortened if you use QRQ > mode. With the K3S synthesizer, you really don’t need QRQ mode for reasonable > hand sending speeds, so turn it off in the menu. > > Victor 4X6GP > >> On 23 Aug 2019, at 17:28, Peter Chamalian wrote: >> >> I received a report of what seemed to be hot switching artifacts when >> running QSK with my SPE 2K amp. The K3S was set for the default TX >> Delay but the friend who reported the issue later found an email from >> Wayne indicating there was some issue with the default TX Delay of 8ms >> actually being more like 5ms which would explain the issue. >> >> >> >> I've not seen anything more about this and wonder if I've missed >> something or Elecraft still working on it? >> >> >> >> In the interim I've increased the value from 8ms to 11ms which should >> put it in line with the actual 8ms default. >> >> >> >> >> >> Pete, W1RM >> >> w...@comcast.net >> >> >> >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net Please help support this email >> list: http://www.qsl.net/donate.html Message delivered to >> k2vco@gmail.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] TX Delay
Thanks Vic. I put in a query to Elecraft support about it and am awaiting their reply. I may have accidentally put the K3S into QRQ mode but my 35 wpm sending hardly qualifies as that. Pete, W1RM w...@comcast.net -Original Message- From: Vic Rosenthal Sent: Saturday, August 24, 2019 9:11 AM To: Peter Chamalian Cc: Elecraft Subject: Re: [Elecraft] TX Delay I haven’t tested it, but I recall that the delay is shortened if you use QRQ mode. With the K3S synthesizer, you really don’t need QRQ mode for reasonable hand sending speeds, so turn it off in the menu. Victor 4X6GP > On 23 Aug 2019, at 17:28, Peter Chamalian wrote: > > I received a report of what seemed to be hot switching artifacts when > running QSK with my SPE 2K amp. The K3S was set for the default TX > Delay but the friend who reported the issue later found an email from > Wayne indicating there was some issue with the default TX Delay of 8ms > actually being more like 5ms which would explain the issue. > > > > I've not seen anything more about this and wonder if I've missed > something or Elecraft still working on it? > > > > In the interim I've increased the value from 8ms to 11ms which should > put it in line with the actual 8ms default. > > > > > > Pete, W1RM > > w...@comcast.net > > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html Message delivered to > k2vco@gmail.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] TX Delay
I haven’t tested it, but I recall that the delay is shortened if you use QRQ mode. With the K3S synthesizer, you really don’t need QRQ mode for reasonable hand sending speeds, so turn it off in the menu. Victor 4X6GP > On 23 Aug 2019, at 17:28, Peter Chamalian wrote: > > I received a report of what seemed to be hot switching artifacts when > running QSK with my SPE 2K amp. The K3S was set for the default TX Delay > but the friend who reported the issue later found an email from Wayne > indicating there was some issue with the default TX Delay of 8ms actually > being more like 5ms which would explain the issue. > > > > I've not seen anything more about this and wonder if I've missed something > or Elecraft still working on it? > > > > In the interim I've increased the value from 8ms to 11ms which should put it > in line with the actual 8ms default. > > > > > > Pete, W1RM > > w...@comcast.net > > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to k2vco@gmail.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 for sale
I second the mag loop antenna or hidden antenna idea like they use in The Villages https://www.k4vrc.com/uploads/1/0/1/5/10156032/present-tvarc_antenna_guide.pdf and portable operation when the wife has other activities with her lady friends. if Ham Radio is the hobby that puts a smile on your face (and in your heart) there are “ways” to enjoy it. If you give up this easily Ham Radio isn’t high on your list and I understand. I had radio before my wife came into the picture and she still complains about my wires in the back yard occasionally but I could complain about her buying scrap booking supplies but never using them or garage saleing buying more stuff that the grandkids don’t need or want . there are trade offs. It has worked for 45 years. Just my not so humble opinion. David J. Wilcox K8WPE’s iPad > On Aug 23, 2019, at 10:39 PM, Eric Swartz - WA6HHQ, Elecraft > wrote: > > OK Guys, let's tone it down. These posts are bordering on inappropriate. > > Also note that both sexes are represented among our list readership. > > Eric > List moderator, when necessary.. > elecraft.com > _..._ > > > >> On Aug 23, 2019, at 7:21 PM, Lynn W. Taylor, WB6UUT >> wrote: >> >> Not much of a secondary market for wives. >> >> Nice small portable rig calls for portable ops. >> >> Just sayin' >> >> 73 -- Lynn >> >>> On 8/23/2019 6:42 PM, Bill Johnson wrote: >>> Sell the wife! Mine was reluctant at first, but I told her, what didn't you >>> get... I had radio equipment oon my apartment kitchen table when we were >>> dating, I had been in the hobby since early teens and if you think I am >>> giving up this hobby, not going to happen! She has slowly relented over >>> the last 46 years. >>> 73, >>> Bill >>> K9YEQ >>> https://wrj-tech.com/ >>> -Original Message- >>> From: elecraft-boun...@mailman.qth.net >>> On Behalf Of EricJ >>> Sent: Friday, August 23, 2019 3:55 PM >>> To: elecraft@mailman.qth.net >>> Subject: Re: [Elecraft] K2 for sale >>> Tough choice... >>> Eric KE6US On 8/23/2019 1:33 PM, Brian Estes wrote: I am selling my K2 ser #7875 which has the SSB and KAF2 filter installed. It has been fully tested by Elecraft and the test report will be included. Reason for selling is wife will not allow any antennas. Price is 750.00 including shipping to any US address. Brian KM4BPE __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to eric.c...@gmail.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 Message >>> delivered to k9...@live.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 >>> Message delivered to kx...@coldrockshotbrooms.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 >> Message delivered to eric.swa...@elecraft.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 > Message delivered to djwilco...@yahoo.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 Message delivered to arch...@mail-archive.com
