Re: [Elecraft] K3 with KSYN3A 100Hz spurious
At one time my old K3 with 2nd RX had a 20KHz+ wide signal on 80m, which generated lots of "attention" since there were two dxpeditions close by and some blamed me for not getting ATNO. Got a "nice" screenshot from a Flex. Receive was OK. I asked the Elecraft support for some ideas and there was not a clear answer. I tested the radio afterwards with an SDR. The bandwidth was getting smaller and then everything was normal. Not sure what has happened. It must have been the transmit path somehow influencing the synthesizer (KSYN3). Ignacy NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA 1500 efficiency
This is normal from theory. Input power increase as I*U. Output power increases as I*I*R. So at half input power one quarter output power. At 1/4 input power 1/16 output power. Two ways around, none implemented in KPA1500. Change transformer windings like in KX3, which is harder to do at high power. Lower the voltage as in Expert amps. In old times, my 20A power supply to a 100W rig broke. I only had 5 A supply. Was good for 5W. But after adjusting with tuner for a max power, the output was 25 W. The tuner acted like a transformer. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 battery upgrade?
I never had a failure with Li-Ion batteries bought from batteryspace.com. They are connected externally to KX3 and charged by an AC charger. They last so long that seldom I need to charge during a trip. I use LiFePO3 for my 100W radio. Ignacy -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 battery upgrade?
LiFePO3 can be as heavy as KX3 and defeats the purpose of KX3 if weight is concerned. I use 4S2P Lithium Ion. Like: https://www.batteryspace.com/li-ion-18650-battery-14-8v-5-2ah-77wh-2x4s-s-rechargeable-battery-pack-6-24.aspx Since it has 16.8V peak, I charge it via a diode for 16V. A diode internal to KX3 makes it 15.4 V max and thsi is what the internal meter in KX3 shows. This is 12% over 13.8 V. Lasts a long time. Full power up to 15W. No problem in > 5 years. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] raspy cw audio on K3--but OK after power cycle
Once my old K3 2k series had a signal that was > 20 KHz wide and jammed dxpeditions nearby. The problem subsided on its own although the receive was OK all the time. Perhaps reseating the modules would help. Ignacy NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Why predistortion ?
Many factors influence how wide the signal is in SSB, not just IMD3 numbers. These are: 1. Quality of ALC. Here K3 is excellent. FT in class A poor. 2. Overdriving the amp. Operators choice or ignorance. 3. Transmit bandwidth. Could be 300-2400 in contests. No adjustment in K3 except by crude EQ. 4. Amount of speech processing. 5. Equalization. Following W2XJ, the future is in the amp containing the complete TX stream. Perhaps only 3 stages, with DAC following by LNA directly driving the LDMOS finals, with bandpass and final filters. All what K4 (or K5 ) does, it to send relevant info to TX via Ethernet. Even better, have all in one box (K5_1500X). Probably the hardware cost is minimal. Nearly all the cost is in software dev't. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] PX3 signal artifact - still seeking a solution
Do artifacts disappear when you have USB cable connected to the laptop but disconnected from PX3? Perhaps the USB cable acts like an antenna. For RFI transmitted via USB cable, try USB isolator. E.g., https://www.amazon.com/SMAKN-Isolator-Digital-Isolation-Industrial/dp/B00XXPO4UG Ignacy NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Upper limits of KPA500?
NK7Z wrote > > Initial testing here indicates no power level is safe... At 150 watts > the KPA500 reaches 70C pretty fast, in under two minutes, and 70C is my > upper limit for testing... At 500 watts it reaches 70C in about the > same time... > > Can I assume the amp is not the most efficient thing in the world at 200 > watts? Correct! Up to a certain limit, the output power increases with PA current quadratically. So the maximum dissipation may be below the max power, and decreasing power does not reduce dissipation much. Assume that at 600W KPA500 operates at 60% efficiency. 1000W total, 400W dissipation. Now reduced the power to 1/4 or 150W. The input current is reduced 50% to 500W. The dissipation is 350W, not much below 400W at full power. With KAP500, the dissipation at low power can actually get worse than predicted since the power supply is unregulated and has higher voltage at lower current. Reduction of dissipation at low power can be done at least 2 ways. One is reduction of voltage as done in SPE amps. The other one is changing the the transformation ratio of output amp, e.g., in KX3; hard to do at high power. One can have the action of a different transformation ratio with a manual tuner. Once my 20A power supply died but I had a 5A supply available. But the max power was only 5W before the power supply switched off. 1/4 curent = 1/16 power. By adjusting a manual tuner for max output I got 20W. But KPA may not let this trick go because of SWR. protection. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Tuner Question for the Group
MFJ-998 seems to tune anything. I am always trembling that it will smoke, but for 5 years, no smoke. Even matching 80m dipole (fed by ladderline) on 40m. It has 2 outputs and keeps matches in memory. Getting it to tune at frequency previously tuned takes a fraction of a second. If both antennas were used at same frequency, tuning for one antenna automatically brings tune in the second. Very convenient for A/B comparisons. The tuner displays L, C and SWR. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] 75 ohm coax
The plus of RG6 is low price, less than 10c a foot. In receive applications, they seem to be lasting forever. In transmit too but small nuisances are necessity to use a tuner for low SWR antennas and nonstandard connectors. But running two in parallel does not make any sense. Half a year ago I found Rg6's 50 Ohm equivalent on ebay. Altelix AX240 for $99/1000ft. Measured parameters same as LMR240. The plus of cheap and good 1000-ft roll (with crimp connectors that can be attached in 30 sec) is that the coax can be cut as needed, with no worries about cost. Ignacy NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 on SSB
Many contesters with large budgets use K3 to win or obtain top scores in SSB contests. This means that K3 is competitive on SSB with other radios, and its flaws in SSB if any are balanced by its advantages. Early K3 had large AF distortions, fixed by a simple modification. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
[Elecraft] 20 KHz wide signal in K3 on CW
A while ago, one station in a contest had a 20 KHz wide signal. I send him email and he replied that he had K3. Yesterday I was calling D2EB on 3521 and got lots of angry reports about my signal jamming everything around. One station sent a panadapter screen. There are spurs about every 700 Hz. The first one is -15db from the main signal, the second -25db, and 3 KHz away it is -35 db. I checked the radio later with a SDR. It had spurs but not as big. I checked the radio today, and the spurs seem almost gone. My K3 is #2283. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 efficiency with a Low-Power Setting
The bias would do nothing for low power. Low power can be implemented in two ways, with different taps at final transformer (KX3), and with different supply voltage (Expert amps). The first one is hard at a KW level. The second one requires power supply with different voltages. If the power supply can deliver only one voltage, not much can be done. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Antenna Select Suggestion
I use MFJ-998 that has two ports attached to 2 crisscrossed dipoles fed by ladderline. When frequencies are pretuned, recalling tune on ANT1 automatically matches ANT2 so that switching to ANT2 does not need any extra match. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Full Break-In (QSK)
With TX/RX switching and DSP, K3 can do only so much. For K3 with 2nd RX, perhaps a new firmware can add a trick from Flex 6600. While basic QSK in Flex is slow due to DSP delays, it is very good if 2nd rx is used for receiving in duplex mode. All what is needed is to mute 2nd rx during transmitting and switch ANT to 2nd rx after that. It may be too much programming for Elecraft, though. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Subject: Re: Operating from a retirement home
You are lucky that RFI is low to a degree that you can still make contacts. I have seen towers in HOA locations in FL so apparently not all of them are strict. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Reaching across the chronological divide
I go to club meetings in US. Almost no young people. I went to a SM club. Young people. I went to a RL3 club. Young people. I went to a 9A club. Mention of many young people. Young people want camaraderie and joint activities. With clubs that own buildings, everyone can come, be on the radio, talk, eat and drink. Also participate in communal activities of setting up antennas and celebrating the succces of it. Being alone in an HOA restricted apartment with signals barely heard because of compromised antenna and high RFI is hardly stimulating. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Feature density of portable transceivers: K1 vs. KX2
It will not charge now. It would be GREATLY convenient if it could. In simplest case, allow charging from DC input if input voltage is <=12.6V and charge current is < 2A. Not sure what is the reason not to allow it. Perhaps concerns about counterfeit batteries without a chip, and possibility of fire. I have external batteries but the beauty of KX2 is that the battery is inside. Ignacy, NO9E On Mon, Dec 9, 2019 at 2:09 PM Don Wilhelm wrote: > The KX2 battery will NOT charge from the external power jack - the > lithium battery must be removed for charging. Unless handled with a > heavy hand, the bottom of the KX2 will withstand many, many removals and > installs. > If you are concerned about removing the bottom of the KX2, you can > always use the Lithium battery externally, just plug it into the power > jack - no internal battery required. > > The KX3 internal batteries can be charged from the power jack if you > have the KXBC3 option installed. > > 73, > Don W3FPR > > On 12/9/2019 1:58 PM, Ignacy Misztal wrote: > > Thank you for the suggestion. Here is something similar: > > > https://www.amazon.com/gp/product/B07V3L4YF3/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8=1 > > > > Wonder whether they are RF quiet? > > > > My thinking with KX2 that I take it with me,without anything external, > use > > portable, and then at home charge via USB overnight without pulling the > > internal battery. Just like the cell phone. > > > > Ignacy, NO9E > > > __ 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] Feature density of portable transceivers: K1 vs. KX2
Thank you for the suggestion. Here is something similar: https://www.amazon.com/gp/product/B07V3L4YF3/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8=1 Wonder whether they are RF quiet? My thinking with KX2 that I take it with me,without anything external, use portable, and then at home charge via USB overnight without pulling the internal battery. Just like the cell phone. Ignacy, NO9E On Mon, Dec 9, 2019 at 12:55 PM Gwen Patton wrote: > Use a USB-C PD power bank, and a USB-C power sink, and you can power the > KX2 handily. I can power my KX3 that way, and most of my other QRP rigs as > well. The sink I use is the PD Buddy Sink found on Tindie. It handshakes > with the PD power bank and provides 12v at 2-3A (depending on the bank). I > have a RAVPower bank with roughly 27Ah (probably rated at 5v, but that's > ok) that works fine with this. It'll also take input power from a mains > power supply used to fast-charge such a bank, or that might be used to > power a Chromebook or other laptop. That gives me a VERY small and packable > mains and mains-free power solution for all of my radios. I could even set > it for 9v for the radios that use THAT. > > There are other brands of power sinks out there. I ordered two of these: > https://www.amazon.com/gp/product/B07T2858G6/ but they haven't arrived > yet, so I haven't tested them. The Buddy Sink is programmed by connecting > it to a computer via USB-C, then accessed with a terminal program. The ones > I haven't received yet have a preset group of output power profiles you can > toggle through by pressing a button on the board. There are others as well, > but I haven't tried any others yet either. > > This isn't a massively unique approach. I'm sure there are other, cheaper, > and probably more specific power solutions, but this has the benefit of > being a multi-tasker. With it, I can charge my Chromebook, my phone, my > external speaker, AND run my radios. I can charge the bank with a power > supply that weighs ounces and fits in the palm of my hand rather than a > brick the size and weight of, well, a BRICK. I even found 3d printable > cases for the PD Buddy Sink that will accomodate either a direct wire > output or a PowerPole connector, so I can attach interchangeable power > cables. > > 73, > Gwen, NG3P > > > On Mon, Dec 9, 2019 at 12:33 PM Ignacy wrote: > >> This is a QRP radio that likes traveling. Mine has even been on a small >> boat >> ride in Adriatic sea... Or working DX SSB in a contest big time (with 9A1A >> antennas). >> >> If only a USB charge can be added. I am afraid that the radio will survive >> only so many case openings... >> >> Ignacy, NO9E >> >> >> >> -- >> Sent from: http://elecraft.365791.n2.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 >> 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] Feature density of portable transceivers: K1 vs. KX2
This is a QRP radio that likes traveling. Mine has even been on a small boat ride in Adriatic sea... Or working DX SSB in a contest big time (with 9A1A antennas). If only a USB charge can be added. I am afraid that the radio will survive only so many case openings... Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] NCC-2 noise canceller with K3s?
I have NCC-2, 3 el-HiZ and a Wellbrook loop. NCC2 is not useful for weaker antennas until one adds amplifiers and, for peace of mind, antenna guards. Very expensive. I had it once miswired and it blew the inside - no fuse. The only time I use it now is for power line noise canceling. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 CW Text Decoding
I feel that KX3 has a much better CW decoder than K3. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] We Need More Power
The correlations between passionate writing and useful content is close to zero if not negative. Due to poor conditions the bands are empty. What you could do with 5W and some wire a few years ago now requires a KW with a beam. Many hams especially in noisy neighborhoods with simple antennas have trouble making contacts and become discouraged. But they can hear a station with a KW and a beam, and they overjoy when they make a contact. The original poster has a foundational license in Australia with, I think, 10W limit. I remember the excitement of such stations when I was working them from a very good VY2 location on 40m, for their first NA contact. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] WSPR with KX3 and WSPR_Beacon/Android
The phone had 1-2 sec delay and setting of an Android phone to time standard is impossible without a hack. I tried using a laptop with time synchronized and again it did not work. I must be doing something wrong with my KX3. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] SO2R with 2 K3s, one KPA-1500
Perhaps it is doable within a single band. Will have to include antenna switching plus sequencer to avoid hot switching. In two band SO2R, the amp would have to switch to another band and adjust the antenna tuner. Perhaps too slow if done over serial CAT. The fact is that KPA1500 was not designed for SO2R with a single amplifier. Buy a second one or get something else (Expert or 4O3A when available). Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
[Elecraft] WSPR with KX3 and WSPR_Beacon/Android
I am trying to use WSPR Beacon under Android with KX3 for Android to check antennas. The beacon transmits and the signal appears but there are no reports. K3 with WSPR under WSJT works fine. I tried USB and data modes. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA 1500 dummy load recommendations
I usually do testing in CW or SSB. In CW the duty cycle is 50% and in SSB about 10% with not too much processing. A few seconds is enough to diagnose problems. Years ago when testing a 200W home made amp I used 2W resistor immersed in water. Worked good enough. Perhaps for longer duty one can use cantenna dummy load ( MFJ-250), also immersed in water. Or attach 1-2 small fans to MFJ-264. Ignacy, NO9E On Wed, Jul 24, 2019 at 11:06 AM Larry Gauthier (K8UT) wrote: > Don, > > Look carefully at the power de-rating curve on your MFJ-264. I also own a > KPA1500, and built my own DIY high power dummy load after seeing that my > MFJ "1500 watt" dummy load can only handle 1500 watts for 8 seconds. > > -larry (K8UT) > > -- Original Message -- > From: "Don Schroder" > To: "Ignacy" ; "elecraft@mailman.qth.net" < > elecraft@mailman.qth.net> > Sent: 2019-07-22 21:21:09 > Subject: Re: [Elecraft] KPA 1500 dummy load recommendations > > I also have a MFJ-264. I figured if I need a dummy load, go with one that > will handle the most watts I will ever need. > I don’t have much room, the MFJ-264 id s 1.5KW dry dummy load for > 1-650MHz. A little smaller than a carton of cigs. > Haven’t used it yet. > > Don, KE0PVQ > > Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for > Windows 10 > > From: Ignacy<mailto:n...@arrl.net> > Sent: Monday, July 22, 2019 7:43 PM > To: elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net> > Subject: Re: [Elecraft] KPA 1500 dummy load recommendations > > I have MFJ-264 and MFJ-250. Both work. Aside from experiments , both are > gathering dust as there is little purpose of using dummy loads for > solid-state amps. > Ignacy, NO9E > > > > -- > Sent from: http://elecraft.365791.n2.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 > Message delivered to donandde...@hotmail.com > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to k...@charter.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 dummy load recommendations
I have MFJ-264 and MFJ-250. Both work. Aside from experiments , both are gathering dust as there is little purpose of using dummy loads for solid-state amps. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Feature Request: Shifting VFO
Is it a feature of ICOMs? Neat as QSY to a far away frequency can be done without pressing any extra button. On the other hand, band-segment memories and clicking on spots makes long-range QSYing less important. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
[Elecraft] Settings for CW decoder in K3
I am trying to use the CW decoder in K3 to help copy fast exchanges. It is hit and miss. The CW decoder in KX3 is better and so is the external CW Decoder by WD6CNF (spkr to MIC). Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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] Connecting SDRPlay to P3 IF OUT, to CW Skimmer
Connecting SDR may be simpler. I think HDSDR has an option to sent I/Q signals to the Skimmer. I use AS-RXFEP - Receiver Front End Protector from Array Solutions to protect SDR. I use TX vertical or RX loop as receive antenna with AS-RXFEP - Receiver Front End Protector from Array Solutions, close to TX antennas and never any problem. Igancy, NO9E -- Sent from: http://elecraft.365791.n2.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] SWR - does it matter?
Assuming that the correct load is 50 Ohms, load with SWR of 1.5:1 could be 33 Ohm or 75 Ohm. Or something more complex. The load of 33 Ohm would cause bigger dissipation and the load of 75 Ohm less dissipation but also less power. Three options here. First, spend hrs/days optimizing your antennas. Second, use antenna tuner. Third, accept inefficiencies. Personally, I would not consider a solid-state amp without a built-in tuner. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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] Tinnitus and the K3 RX EQ and Related Variables
I used to have a dual channel 15-band equalizer. It could quickly compensate for deficiencies in my ear and signals. Compared to software equalizers, you can manipulate them rapidly for max readability. Many times a difficult copy became an easy copy. However, the equalizer was susceptible to RFI, had some background noise and it took lots of space. Now I use RX EQ in K3. Good but not as good as the manual equalizer. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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] Why are the batteries internal to the KX3?
NiMH batteries inside do not leak and they are useful if KX3 is used for something quick, e.g., identification of RFI. They are also good for backup if an external battery is depleted. If someone is really smart, one can try to remove the inside battery holder and substitute 3 Li-Ion flat polymer cells in place, like: https://www.batteryspace.com/1-2cratepolymerli-ioncellspacks.aspx They will need some external connection for charging. I use to have such batteries inside K2. Light, fast-charging, and never a sign of trouble. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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] KPA1500 PA Current
At 1500W my Expert 2k-FA reports 50-52A at 49 V. About 55A at 1800W. The Expert saturates at 2 KW. You may check out the SWR with a reputable meter. Often multiple meters show different values on different frequencies. For instance at my station LP100 shows 1.4:1, 2k-fa shows 1.2:1, and K3 shows 1.8:1. But no problem in the end. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 still a viable portable contest station?
The challenge in the phone contest at 100W with compromise antennas is being heard. This depend on the quality of speech processor and microphone or equalization. The difference between excellent and not so speech processor can easily be 1-2S. K3 has an excellent speech processor with equalization. K2 has compressor and sounds OK but not dramatic with good microphone. IMHO KX3 processor is not too efficient and even below K2. But KX3 has an equalizer allowing any mic to sound good. For portable radios, the best procesor seems to be in FT-891. A good contesting combo if one can afford it is KX3 driving Expert 1.3k for > 1 KW. The Expert weighs 20 lb and has ATU to trim less than perfect antennas + automatic 110/220V switching. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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] OT: Astron linear PS regulation issues
I wanted to love a 45A Astron but it was heavy and hummed. Sold for peanuts at a hamfest. Replaced by Jetstream JTPS32MAB. Probably same as MFJ-4230MV and many others. Small, quiet and cheap. Excellent regulation. If it dies, it is $80. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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] Non-Resonant Antennas and Chokes
You have several choices. 1. Add voltage or current balun at tuner output. Voltage 4:1 is simpler. 2. Connect the ladder line directly but loop the coax by the tuner a few times around a large toroid. This is equivalent to adding a balun. Do not ground the tuner. The first option guarantees balance but may add some losses. The second one is trivial to do. Most likely you will not be able to tell a difference. I used to have 70ft dipole at 25 ft fed with ladderline all the way to the shack. Matched by MFJ-962C, which had internal balun. Never a problem with up to 500W and even worked coast to coast on 160m! Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Yama CM-500 Replacement
CM-500 is OK. It had so-so sound insulation (not good with loud amp) and it disintegrated. Now I use Sennheiser PC 350. Much better built and better sound insulation. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Less Than Perfect Antennas
I used about 90 ft of wire 20 ft up and 2 20 ft sloping radials, all connected to K2 directly. I was able to work many stations on 80m SSB in a 200 mile radius. All wire "concoctions" can be treated as a dipole but not necessarily fed in the middle. So they are likely 1) very inefficient when fed by coax 2) require a balun because of off-center feeding especially if the radio is not battery operated, 3) are not good for DX unless they are high enough, and 4) they may be directional where they are > 1/2 wave because of strong lobes. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Wish I had a KAT1500
Try MFJ-998. It matches my 80m flattop fed by ladderline on 160, 80 and 40m (high impedance full wave) using 1:1 balun. I use it for 40 and 80m running at 1.5 KW level. It had a number of small problems but no problems with relays/caps/inductors. When everything is set up well, it recalls old setting in a fraction of a second. It has output for 2 antennas. When each antenna is prematched, once you change frequency with antenna A and the switch to B, it is automatically matched as well. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] PROPOSAL: K2/10 Battery LiPO / 8AA carrier option
LiFePO3 is good choice if size does not matter. Li-Ion is half weight and size. Personally I use LiFePO3 for my 100W radios. I use Li-ion for KX3 for travel. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] PROPOSAL: K2/10 Battery LiPO / 8AA carrier option
This battery has very high current potential but does not have a limiting board. You can connect it to K2 via a resettable 3A fuse. But I would choose Li-Ion something with less max current and PCB board for safety and reliability. Like: https://www.batteryspace.com/li-ion-18650-battery-11-1v-2-6ah-28-86wh-4-2a-rate-3s-s-battery-module---un38-3-passed-ndgr.aspx For many years I used 3S1 combination using flat cells inside my K2. It was charged at 12.8V with 1 A limit and the connection to K2 was by a resettable fuse. Keeps > 11V for about half the charge. Never a problem despite travelling across all continents. Very light. But I was always afraid that something would short causing trouble. With batteries with PCB for limits, the risk is far lower. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Looking at KPA1500
The low range tuners up to 3:1 are very low loss and then can be made reliable. High range tuner for 1.5KW would be less so. You may buy MFJ-998 as an extra. I use MFJ-998 with 1.5 KW and a ladderline-fed dipole for a few years. Only small problems like burnt diode in SWR circuit or smoked capacitor by the output connector. But it is better to have such problems outside of the amp. Another choice is to have an AB switch where the same antenna is connected to A directly and to B via capacitor that lowers the SWR where otherwise it is too high. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Efficiency As A Function of Input Power
The theory states that Power in = U I Power out ~ I*I*r So power-in is linear with current. Power-out is quadratic with current. Driving hard helps efficiency but hurts linearity. Max efficiency with LDMOS is about 60% with reasonable linearity and no feedback, but could be > 70% with predistortion. Higher efficiency can be obtained in class C for CW/RTTY however wideband SS designs are not suitable for class C. For low efficiency at lower power the best approach is to reduce the supply voltage. SPE gives a choice of 25V (1/3 power), 35V (half power) and 48V (full power). New 4O3A (Flex) amplifier is supposed to adjust supply voltage automatically for highest efficiency at a given power. Another choice is to use an external tuner for max power, not low SWR, as e.g. at 1/4 power the optimum output impedance is 200 Ohms not 50 Ohms. Elecraft is using a trick in KX3 where at > 12 V and 5 W another ratio is used in the final transformer, reducing power input by almost one half. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Trade KX2 for KX3
Did you trade? I have KX3 and want to travel with something lighter. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3s+KPA500 SSB audio distortion
Could it be RF feedback? You can check it by transmitting into a dummy load or lowering the drive power. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Operating KX3/KXPA100 on LiPO3 batteries??
I use Bioenno 2 x 6Ah with a 100W rig. During CW contests in S in break-in mode they last > 3 hours. No problems. The advantage of 2 x 6A is that they can be taken on the airplane without a permission. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Amp comparisons
My experiences are similar to those by Igor. I use K3 with SPE 2k. Very convenient with 6 antenna connectors with 3 antennas per band. Turns on and off with K3 and follows bands. Antenna switch and ATU are active with teh amp off. But 2k is heavy and the PS generates some spurs. I used KX3 with SPE 1.3k. Smooth integration. Light. No PS spurs. 4 antenna connectors with two antennas per band. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 hardshell case question
For a few years my KX3 travels in a Pelican case that is about 9 x 6.5 x 4. Aside from KX3, inside there is space for a log, 2 spools of wire, KX3 keyer, binding post, and 4S2P Li-Ion battery. The battery lasts a few 2 hr outings. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Expert 1.3 to KX3
I used KX3 + 1.3k with Dan's cables during expedition to CE0Y in CQ. Read about experiences in CQ Magazine (Oct 2017?). -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Linearity
The saturation can be due: - transistor limit -not the case here - power supply drop - not if well designed switching PS or a commercial unit - winding ratio in final transistor module You can test the last one by measuring max power at saturation. Should be at least 2 KW. I have Expert 2k-fa that has 6 transistor modules rated at 300W. Saturated power around 2.0 KW as measured by LP100; 2k's meter shows 2.4 K. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
[Elecraft] Recessed pins for CW paddle in KX3
The CW paddle in KX3 is attached to a 4 pin connector inside KX3. Recently two bottom pins recessed creating a short. I pulled them back and was able to solder one pin but the other pin is hard to reach. Did anybody experience a similar problem? Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] OT Tuner ranges
There are reports online that 1:1 has lower losses. My experience is that with lower-range tuners 1:1 does not cover some frequencies but 4:1 does. Ignacy, NO9E. -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] DSP vs. non-DSP portable transceivers
To put it mildly, with progress in computing, the implementation in DSP is easier, smaller, cheaper and mostly better. Programming is expensive. Same with tube and SS amplifiers. Most likely, hardware-wise SS is easier, cheaper and mostly better. Initial design and programming are expensive. Average age of ham radios is around 65 (QST). Old "truths" die slowly. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Preamp 2
Barry is in VK. If he operates from the middle of nowhere, local noise is nonexistent and local activity is extremely sparse. It means you hear lots of weak stations, most of which you have little chance of working unless you have good antennas and run power. So preamp is a plus in receive but it causes frustration when trying to call. I remember frustration as VK2/NO9E hearing many US on 10m, with little success except contesting. Also the band full of US station during the ARRL 160m contest. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] New Sub RX
> But I still get my thrills from working > weak DX on 160 that I hear with my ears (like VU2BGS last night who runs > 140W to a 10 meter high vertical!). ^ 73, Bill W4ZV For every DX with a short vertical on 160m there is someone else with 4 square. I heard Bill as ZL/NO9E on 160m last month with $599 FT-891 and he was loud! Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] BNC connector oddity on KX3
I use many BNC connectors, some at KW level, and nearly all of them are good. But occasionally some do not make a good contact and need to be thrown away ASAP. The best way to check is to try another cable. Recently I bought a large number of cheap RG-58 cables with BNC connectors from showmecables.com. The cables turned out to be 60 Ohm and many connectors are poor. I like cables at hamfests from old professional equipment. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Best Batteries for KX-3?
If cost is not but weight is an issue, lithium AA work well. I expect that you get at least 10 hrs receive. They do not leak. I used KX3 to locate noise with small loops, with limited success due to poor dieirectivity. If your noise sources are on 80m, the new RDF from RigExpert works very well. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Flying with a Spiderpole
I took 12m Spiderpole with no questions and no extra fee. For smaller height I use a light 7.5m pole that collapses to some 60cm and fits in a medium suitcase. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Memories in K2 not working
Don, Thank you for the info.He has K1. I will ask him to contact the Elecraft group or you. Ignacy, NO9E On Sat, Jan 27, 2018 at 2:12 PM, Don Wilhelm <donw...@embarqmail.com> wrote: > Ignacy, > > How is he trying to load the memories. He must use paddles connected to > the K2 directly and not from an external keyer or a straight key. > > Is he pushing the buttons correctly? Does he know the difference between > a button tap and a hold? > > 73, > Don W3FPR > > On 1/27/2018 12:48 PM, Ignacy wrote: > >> I sold my K2 and the person who bought it found that CW memories are not >> working. I have never used them. Any idea what could have gone wrong? >> Ignacy, NO9E >> >> >> >> -- >> Sent from: http://elecraft.365791.n2.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 >> 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
Re: [Elecraft] KPA1500 ATU - ability to handle more than two antennas
Microham Station Master listens to K3 traffic, decodes frequency and sets switches as programmed. This is regardless whether the amp or computer are on. Also very reliable unit. Can also be used for as rotator controller. I cannot praise it enough. I have Expert 2k-fa and it is a love-hate relationships. On one hand, 2 input and 6 outputs with a reasonable antenna tuner. I switch bands and antennas, and no extra work. On the other hand, it failed 4 times, the PS supply creates RFI (fixed partially by a large toroid), and it is pretty loud., requiring headsets all the time. Also, ability to control antennas outside of front panel (or an unreliable app) is variable under Flex only (DDUTIL). Expert 1.3k-fa has RFI quiet PS and is very light. Its back fans are quiet but the one insides is annoyingly loud - apparently fixed in newer models. Also only 4 antenna outputs. But it was brilliant working with KX3 as CE0Y/NO9E. So I am looking for an Expert replacement -quiet both acoustically and RFI, as automatic and with good CAT. Perhaps KPA1500-2 will be it. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
[Elecraft] Memories in K2 not working
I sold my K2 and the person who bought it found that CW memories are not working. I have never used them. Any idea what could have gone wrong? Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 ATU - ability to handle more than two antennas
If there are only two antennas per band, perhaps this is doable with dual-input antenna switch (like DXE-RR2X8B) and Microham StationMaster. For each band, MH SM selects one antenna for A and another one for B. To change an antenna within a band, select A or B in the amp or via CAT. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 ATU - ability to handle more than two antennas
Multiple (4 to 6) antenna connectors is a nice feature of Expert amps. Once you have antenna matched, QSY to up to 2-3 antennas per band is automatic. The psychological effect is astounding, as trying to get SWR as close to 1:1 is becoming a waste of time. In my Expert 2k-fa I have 5 antennas connected. Having two antenna connectors is probably enough for heavy duty contesters where sophisticated antenna selection together with SO2R is done externally. However, Elecraft can provide several logical antennas software selected, with each one matched separately. They can also come with an external switch. Only 2 connectors is a reason why I am not placing the order for KPA1500. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] FA-VA4
It is cheap and accurate after OLS calibration with good loads. Attached 50 Ohm load was so so. I am using it when accurate impedance measurements are a plus, including for LC. For instance with 160m antenna, measure, prepare appropriate coil or capacitor, and the match is perfect. On the other hand, navigation is difficult with 3 buttons. Also not rain resistant. No computer connection. If absolute low cost in not an issue, RigExpert AA 55 Zoom is much easier to operate, is as accurate with OLS calibration, has tons more functionality including cable testing, and is not much bigger or heavier. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Antenna Analyzer (FA-VA4)
The choice of analyzers is not that simple unless cheap price is the only factor. I have four analyzers: Rigexpert 230Pro, FA-VA4, VNWA3 and Mini60. Rigexpert covers up to 230 MHz and costs about $500. It is the easiest to use and has the most functionality. Less accurate because it does not have OLS calibration and is pretty big, but new models (Zoom) have calibration and are much lighter. Seems rain resistant. Coax testing for short and length is a blessing. I use it most of the time. VNWA3 covers > 1300 MHz and costs about $600 but needs a computer. Often requires multiple calibrations requiring an hr. Has two port for filters and beam testing. I use it only when nothing else works. FA-VA4 works up to 100 MHz and is very accurate after good calibration (included 50 Ohm load is not too good). Light but not the smallest. Getting things done takes many buttons. Not waterproof. Also. soldering is tricky and I wonder whether bad soldering will show up one time. I use FA-VA4 for portable measurements where accuracy is important. For instance impedance of inv L on 160m. Measure impedance, prepare appropriate coil, and no extra fine tuning needed. Also very useful to measure properties of toroids across frequency. I also have mini60 that works up to 60 MHz, is very small, can be charged via USB, and interfaces with Android phone, and costs $100. SWR accuracy is good but X is not. I leave it for travel. -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] DXE NCC-2 & K3/K3s
I have one input redirected from RX-OUT and the other one fed by a switch from KD9SV front saver. My two goals were: 1. Canceling powerline noise. 2. Trying and perhaps phasing multiple receive antennas. I have Hi-Z triangular connected to RX-IN. Not more happy than with MFJ-1026 although I may not have tried hard enough. Given its price, NCC-3 should have: 1. protection to eliminate damage in output if miswired. To avoid trip back to factory. 2. built-in preamps and overload protectors for inputs A and B. No extra cost items. Without, sensitivity with receive or sensing antennas poor especially that NCC2 adds some 10db loss. 3. switch for multiple antennas. 4. smaller. Ignacy, NO9E Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 Field Ant. for 80/40/30
I tested the endfed from myantennas at 1 kw. The transformer was only warm so no significant losses there. The feeder was RF hot so a toroid choke was added. Cable no longer hot and toroid cold. SWR low on many bands. So the only significant losses could have been through the ground. This is obvious after a bit of thought. A vertical or inv L ( or low inv V) needs either good ground or lots of radials for small ground losses. With endfed, there is one radial, the feeder. So excellent performance by the beach, not bad in good ground, so so in poor ground. Ignacy On Nov 21, 2017 7:58 PM, "Erik Basilier" <ebasil...@cox.net> wrote: Ignacy, For an end-fed wire, I would see the possibility of power losses not only in the feed feeder, but also in the tuner, the transformer, and the effective counterpoise path. For low counterpoise losses, small counterpoise current is desirable, which means a high antenna impedance. When a long counterpoise wire is needed, and when that wire is close to the ground, I would also expect ground losses from the counterpoise current interacting with the ground, in addition to the ground losses caused by the antenna wire interacting with the ground. When the feeder (outside or shield)-tuner-radio path carries all or part of the counterpoise current, I would not rule out the possibility that the possibiility that the resistance there is sufficient to cause losses significant enough to affect overall efficiency of the system. That is why I would like to compare like antennas with different feed systems. Of course antenna wire configuration is the most important thing to determine overall performance, but when putting up a long wire, I usually start with the support structure that already exists, or that I can put up most easily. 73, Erik K7TV -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ignacy Sent: Tuesday, November 21, 2017 5:07 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KX3 Field Ant. for 80/40/30 Antenna performance does not depend on how it is fed (if feeder losses are low) but on height and ground type. For KX3 with AT, any special length makes little sense, especially in portable conditions. KX3 matches most random wires, and KX3 with 4:1 balun matches any wires. Lack of balance is not too important with battery operation. I try to make random wire + counterpoise at least 1/4 wave on the lowest frequency for reasonable efficiency. For 1.5 KW, an endfed with a 49:1 or so transformer makes lots of sense as wideband tuners for QRO are rare, expensive and heavy. "Myantennas.com" perfected a transformer that has very small losses and does not self-destroy at high power. But in inv V configuration, it is way down from a flattop. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to ebasil...@cox.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] KX3 Field Ant. for 80/40/30
Antenna performance does not depend on how it is fed (if feeder losses are low) but on height and ground type. For KX3 with AT, any special length makes little sense, especially in portable conditions. KX3 matches most random wires, and KX3 with 4:1 balun matches any wires. Lack of balance is not too important with battery operation. I try to make random wire + counterpoise at least 1/4 wave on the lowest frequency for reasonable efficiency. For 1.5 KW, an endfed with a 49:1 or so transformer makes lots of sense as wideband tuners for QRO are rare, expensive and heavy. "Myantennas.com" perfected a transformer that has very small losses and does not self-destroy at high power. But in inv V configuration, it is way down from a flattop. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] (OT) - Unplanned Discovery
How much noise from "warts" enters the antenna depends on the antenna. Close and low antenna will pick up more and high and far will pick up less or nothing. Also, balanced or with a good balun will pick up less than unbalanced or where KX3 is a counterpoise. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3: CM500 best price/use with
VOX is KX3 is pretty good. But outside it is activated by wind. Elecraft sells KX3-PCKT cables that include the PTT connection. CM-500 is fine if you are on a limited budget or don't try anything else. After buying Sennheiser PC350, CM500 (worn by time) is gathering dust. For KX3, I am using GE foldable headset. Good sound but not closed. Much smaller than CM-500 and $8.75 at Walmart. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 and KX3 with A/B switch
Thank you for the comments. The pop goes away with AGC OFF. It also goes away with AGS PLS set OFF. Perhaps PLS OFF will be my new default setting, unless in heavy QRN. Now, I will have easy time partying with K2. BTW, it goes to Z35M, who should be "Elecraft hero". He made about half a million,QSOs mostly portable using K1. To many, he put ZA on the map.See his QRZ web page. Ignacy, NO9E On Thu, Nov 2, 2017 at 12:46 AM, Wayne Burdick <n...@elecraft.com> wrote: > Ignacy, > > I’ve never noticed the KX3’s AGC pumping, so I suspect something else. > Small speaker aside, it should sound every bit as good as the analog K2, > just with additional filtering features (thanks to the KX3’s DSP). > > Try turning AGC off. If there really were pumping, this would stop it. If > it doesn’t stop, there’s something else going on. Do you have NB or NR > turned on? Also try setting RX SHFT to 8.0 to see if you have noise getting > into the KX3’s power supply lead. Baseband (RX SHFT=0) would be more > affected by this in some cases. > > 73, > Wayne > N6KR > > > > > On Nov 1, 2017, at 7:17 PM, Ignacy <n...@arrl.net> wrote: > > > > I am going to sell my K2 as it is gathering dust since KX3 came on > board. But > > for probably the last time I put them on the A/B switch. Here is what I > have > > found. > > > > 1. K2 has good speaker. KX3 has lousy speaker. Nothing strange as K2 is > > bigger. > > > > For comparisons I attached KX3 to an external amplified speaker. > > > > 2. A weak CW signal in K2 is natural and easy copying. You can make it > sound > > similar in KX3 by playing PBT and sometimes engaging APF. > > > > 3. in SSB, K2 sounds nice and mellow although the bandwidth is limited. > KX3 > > sounds tiring because of AGC pumping. I fiddled with HOLD, ATTACH, etc., > > with little effect. > > > > K2 has to go because it is too big. But it is a fine radio. > > > > Has anybody found AGC in KX3 harsh? Any way to do something about it > other > > than running RF gain? > > > > Ignacy, NO9E > > > > > > > > -- > > Sent from: http://elecraft.365791.n2.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 > > Message delivered to n...@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
[Elecraft] K2 and KX3 with A/B switch
I am going to sell my K2 as it is gathering dust since KX3 came on board. But for probably the last time I put them on the A/B switch. Here is what I have found. 1. K2 has good speaker. KX3 has lousy speaker. Nothing strange as K2 is bigger. For comparisons I attached KX3 to an external amplified speaker. 2. A weak CW signal in K2 is natural and easy copying. You can make it sound similar in KX3 by playing PBT and sometimes engaging APF. 3. in SSB, K2 sounds nice and mellow although the bandwidth is limited. KX3 sounds tiring because of AGC pumping. I fiddled with HOLD, ATTACH, etc., with little effect. K2 has to go because it is too big. But it is a fine radio. Has anybody found AGC in KX3 harsh? Any way to do something about it other than running RF gain? Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KLPA3A power transistor thermal stress concerns
Seems a bit artificial problem, unless someone is driving an amp that requires 12 W. My modified Expert 1.3k-fa requires about 6W to 8 W for 1 KW output. If a serious concern, increase voltage to 15V. The Yahoo KX3 group has graphs of IMD3 as a function of power and voltage. Increasing voltage at 12 W by 1 V decreased IMD3 by about 10 db. I assume that the LPA in K3 is similar to the amp in KX3. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
[Elecraft] KXPD3 problem - solved
The problem appeared suddenly. When KXPD3 was inserted, KX3 started sending dahs. With KXPD3 not fully screwed, keying was OK. What happened was that the two bottom pins in KX3 that mate with KXPD3 recessed, touching connections with the upper pins. Then, the ground pin became the dah pin. When KXPD3 was not fully inserted, the recessed pins did not make contact; the ground connection was through the screws. I pulled and resoldered the pins. Now everything is fine. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KXPD3 problems - Solved
The two pins in KX3 that mate with KXPD3 were recessed a few mm. After pulling back, the key works fine. I must have inserted KXPD3 too hard, and the pins gave out. I wonder how to secure the pins from recessing. Crazy glue, epoxy, or something else. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Mobile from 117 VAC
This is entirely unnecessary. Use the cigarette lighter and MFJ power conditioner. While you radio requires 20A peak, the power conditioner reduces it to about 8 A average, which the cigarette lighter will do easily. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 with BL2 Question
As mentioned before, the best option is ladderline attached directly to BL2 on KX3. I am using KX3 with BL1 set to 4:1 using random wires. I also use a direct BNC-banana plug connection. With the direct connection, match is obtained on many some but not all bands, and often only after second pressing of the ATU button. On some bands, touching KX3 causes SWR to rise. So impedances may be too complex for KXAT3 to match, a match may include very high losses in KXAT3, and KX3 is part of the antenna. With BL1, the match is always achieved, with antenna or without. No changing of SWR with touching. So BL1 insulates KX3 from the antenna and 1) reduces impedances to levels more easily matched by KXAT3 and 2) introduces own losses. I prefer BL1 because its better to heat the balun than the tuner. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KXPD3 problems
The problem with KX3 in TX when KXPD3 is fully inserted started just 2 weeks ago. Perhaps one air travel with rough treatment too many. Before everything was fine. If I put a blade of a small pocket knife between KX3 and KXPD3, the key works OK. Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
[Elecraft] KXPD3 problems
KXPD3 worked well until last week (ES/NO9E). Now as Z3/NO9E, KXPD3 sends when fully inserted. When partially inserted, it works OK. It seems that the bottom pins in KX3 are a bit lower and the top ones are a bit recessed. But perhaps it was always that way. I tried to open and close the KX3 and nothing is loose. Any idea what to do? Ignacy, NO9E -- Sent from: http://elecraft.365791.n2.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] 14 volt batteries?
Most rigs are designed for a range (13.8V +- 15%). IMD3 are better at higher voltage, but excellent IMD3 with predistortion can make this point moot. Many computer chips operate at 1.5V, and conversion from 12V is normal. Expert amp 1.3k operates at full power from 90 to 270V. Apache 8000 has 12V/50V conversion inside. With newer generation and predistortion + more intelligent design, radios may limit themselves to max power at given voltage, all with excellent IMD and high efficiency. Say 80W at 10V to 150W at 16V. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/14-volt-batteries-tp7633619p7633638.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Is K4 talk verboten?
Perhaps it does not matter what we write because most likely Elecraft is already working on it. The advantages of K3 are high blocking and dynamic ranges together with quiet synthesizer. Also lighweight and good ergonomics to those who got used to current. Minuses are lots of connectors/cables and high price. Making all SDR would make the radio lose high blocking range. Making the screen bigger would either make the radio bigger or the number of knobs smaller. Here are possibilities - SDR configuration with 2nd RX but with provision for current RX with single Xtal filter - panadapter display with connection to external display - built in PS Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/Is-K4-talk-verboten-tp7633604p7633637.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Camino de Santiago portable operation from Spain
That would be lots of fun. But hamming is for your own satisfaction. Walking with weight is an issue so KX2 is better. I would take wires and perhaps a small collapsible pole. E.g., a 17ft pole that collapses to 1.5 ft and weighs 4 oz. Years ago I hiked Pico de Europa in EA1 not far away from the trail and made a few CW contacts with KX1 by spreading antenna wires on rocks. KX1 is light but only 2 W. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/Camino-de-Santiago-portable-operation-from-Spain-tp7633448p7633460.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] RX antenna protection
This is my experience. Making a large-signal preamp is usually a waste of power since it is a mixer that is a limiting factor. I can believe that a device from DX Engineering can be poorly designed. Have NCC-2. Weighs like a tank but fragile like a baby. Ignacy, NO9E On Tue, Aug 15, 2017 at 3:59 PM, Vic Rosenthal <k2vco@gmail.com> wrote: > I disagree. A good preamp like the DXE preamps can handle large signals > and still be linear. That means they can output a lot of power. Do not > assume you are safe if there is a preamp unless it is a lousy one! > > Vic 4X6GP > > > On 15 Aug 2017, at 18:07, Ignacy <n...@arrl.net> wrote: > > > > If a receive antenna has a preamp, there no need to do any antenna guard > > since the preamp cannot destroy K3. > > > > I used K9AY, K7TJR 3 el array, and a Wellbrook loop close to transmit > > antennas. None was turned off during transmit. Both have preamps and > > nothing was damaged despite running a KW. Of all 3, K7TJR was the best > by > > far. > > > > BTW, the RX ANT input in K3 is protected by a RF activated relay. > > > > Ignacy, NO9E > __ 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] RX antenna protection
If a receive antenna has a preamp, there no need to do any antenna guard since the preamp cannot destroy K3. I used K9AY, K7TJR 3 el array, and a Wellbrook loop close to transmit antennas. None was turned off during transmit. Both have preamps and nothing was damaged despite running a KW. Of all 3, K7TJR was the best by far. BTW, the RX ANT input in K3 is protected by a RF activated relay. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/RX-antenna-protection-tp7633402p7633412.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 SHUTTING DOWN OPERATING JT65
Older versions of K3 had a problem with a trap or LPF in PA where at higher frequencies and higher power the current increased to a point of PS shutdown. Contact Elecraft for a fix. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-SHUTTING-DOWN-OPERATING-JT65-tp7632656p7632697.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX2AT2 vs T1 Tuner?
The balun made of a jumper between the radio and the tuner works at low SWR so its losses are negligible. The same jumper on the outside will work at possibly very high SWR and may have substantial losses. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/KX2AT2-vs-T1-Tuner-tp7632557p7632588.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX2AT2 vs T1 Tuner?
Internal tuner is very convenient with extra pluses of remembering setting and not requiring an extra battery. But with some antenna x freq combinations, SWR is sensitive to touch and a balun is needed - an extra weight. With T1, that balun could be a few turns of jumper made of RG-174 around a toroid. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/KX2AT2-vs-T1-Tuner-tp7632557p7632574.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] BL2 -- Antenna Balun Usage
Just to add to one extra reply. Z readings from 259B or VA1 are inaccurate. SWR measurement is pretty good, though. BL2 balun is very good in transforming 200 to 50 or 50 to 50. It is hard to figure out exactly what is does outside the range. When BL2 is not hot, it is good enough. Whether it is hot or not depends not only on power but also on impedances to transform. I used BL1 with too short wires and the balun was hot but I was making contacts. For precision measurements buy VNA that can be calibrated. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/BL2-Antenna-Balun-Usage-tp7630889p7630895.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 with KX-3/KXPA-100
If KPA1500 uses LDMOS without too much feedback, KX3 may be able to drive KPA1500 directly by removing the attenuator. Expert 1.3k-fa is sold in the US with limited gain due to FCC regulations, but individually, each one can be modified legally by removing the attenuator. With the Expert is does not invalidate the warranty. My modified Expert needs from 5 to 8 W for a KW so KX3 drives it perfectly. Each extra stage increases distortions and adds cables. So doing it directly is beneficial if it can be done. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA-1500-with-KX-3-KXPA-100-tp7630723p7630764.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX2 Heatsink
I posted quite a few messages to the KX3 group on Yahoo. Some of them over a year ago were lost. I asked Howie and he responded that he deleted nothing. It seems that past May of last year, none of my posts made. My messages to other groups on yahoo make it, the last one yesterday. Not sure what it is. Many "free" websites now change designs, often for the worse to a user, to generate more advertising. Perhaps it is due to an ad blocker with a specific browser. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/KX2-Heatsink-tp7630670p7630736.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 Message delivered to arch...@mail-archive.com
[Elecraft] Unequal signal form dual receive in KX3
With dual receive, my KX3 has different gains from VFO A and B. This is easily heard when switching pressing A/B. When in dual receive, a weak station in VFO B may disappear as VFO B. I do not hear this in K3. When A/B switching, the signals just change sides. Any workaround? Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/Unequal-signal-form-dual-receive-in-KX3-tp7630724.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] OT - operating QRP at same park
Looking at KX3 diagram, the signal goes trough low-pass filters and band-pass filters. Both are separate for 30-20 and 17-15 bands. So soem but probably not much attenuation from 20 to 15 and vice versa. The attenuation between 17 and 40 is likely much stronger. I assume that the front end in KX2 is same as in KX3. The bandpass filters in K3 also cover two bands but have extra caps switched in, probably for single band coverage. This would explain why K3's are not interfering much cross band. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/OT-operating-QRP-at-same-park-tp7629369p7629379.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX2 and Sherwood Eng. RX Performance Ranking?
I think the Sherwood ranking to KX2 means nothing unless you have a KW amp (e.g., Expert 1.3k after mods) and run it in a contest or DXpeditions. After all, nobody will hear you. Also nobody will hear your IMD3 except your next door neighbor. The biggest values of a QRP radio are: 1) convenience including good antenna tuner 2) well compressed signal on SSB if on phone If KX2 is like KX3, big yes to 1) and not much to 2). But you can always buy TT-715 and increase the punch of KX2 in SSB by 2-4 times. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/KX2-and-Sherwood-Eng-RX-Performance-Ranking-tp7627760p7627775.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Receiver mush
I experienced the mush as well and then rode the RF gain. The problem is due to AGC reacting way too fast when in FAST. It seems that higher HLD should solve the issue but it does not. I am wondering whether HLD is applicable to AGC SLOW only? If so, the other choice is to reprogram AGC SLOW, as K2AV does. Perhaps it completely solves the problem, as Guys writes that he uses the fast AGC only during QRN. I am not sure whether AGC is mode specific as AGC slow needs to be really slower for SSB and casual operation. If AGC is not mode specific, this means reprogramming AGC SLOW before and after every contest. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Receiver-mush-tp7627220p7627275.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] 9:1 Balun
Practical side only. Assume you use a random wire antenna. AT in K2 or KX3 will not match all bands directly. It will match with BL1 or BL2 in 4:1 mode. This is because: 1. After transformation, the impedance is more manageable to KAT2 or KXAT3. 2. Loss in balun. Mainly on lower bands with short antennas. Whenever I have space for BL1, I use it. It is no brainer as I prefer the match than no match and balun overheat than AT overheat. Heating occurs mainly at bands were the wire is too short. New transformers can have extremely low loss. A 64:1 transformer used for 40-10 or 80-10 endfeds at myantennas.com is just warm at a KW level. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/9-1-Balun-tp7626310p7626364.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Random wire lengths for antennas
KXAT3 has trouble matching high impedance antennas. No problem matching anything using BL-1, BL-2, or any other 4:1 (or 9:1) balun although for odd impedances the balun may have substantial losses. But I prefer balun than antenna-tuner overheating. Probably all wire longer than 1/4 lambda radiate nearly all. Vertical above 5/8 lambda start generating high lobes. Horizontal add a few db because of ground reflections but also lobes. Once I made an experiment trying a vertical with a few radials, a random long wire with radials, or two random long wires as a semidipole, all fed by TV ribbon. In all cases, two random wires were the best, often by far, across bands. But setting up a portable vertical is easy, one long wire is hard, and 2 long wire is the hardest. In a nutshell, random wires are fine with exact length unimportant. If tuning problems, use a small balun. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/Random-wire-lengths-for-antennas-tp7626200p7626283.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 Message delivered to arch...@mail-archive.com
[Elecraft] K3 and right channel dead
During a very successful 160m run, K3 stuck in transmit, the SS amp switched off and then K3 turned off. After turning on, the right channel is gone. With SUB on, both signals are in the left ear. Any possibility it is not a hardware fault? Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-and-right-channel-dead-tp7626162.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-500 Running hot on 20m
I wrote an article on fan noise including in amplifiers. See http://www.eham.net/articles/38328. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA-500-Running-hot-on-20m-tp7625577p7625633.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 Message delivered to arch...@mail-archive.com
