Re: [Elecraft] KPA1500 ATU question

Hi I tried to train the ATU for 6 mts. 50.090, I do ATU Tune and after it finished show me a SWR 1.5:1 I change to ATU BYP and SWR is 1:1 So seems something is wrong with the KPA1500 tuner? 73, Jorge CX6VM/CW5W El mar, 13 sept 2022 a las 15:29, Dick Dievendorff () escribió: > What I do is

Re: [Elecraft] KPA1500 ATU question

IMO, the really critical thing to do is to follow the table in the manual and "train" the ATU at the recommended intervals on each band.  Once you have done this it effectively becomes a 1500-watt transceiver (unless, of course, you have more than two antennas per band). 73, Pete N4ZR Check

Re: [Elecraft] KPA1500 ATU question

thanks all very much for the tips 73, Jorge CX6VM/CW5W El mar, 13 sept 2022 a las 15:29, Dick Dievendorff () escribió: > What I do is leave the ATU function ON for all bands. If my 6 meter SWR > is “really good”, the ATU tune operation (done once in a “training > session”) discovers this and

Re: [Elecraft] KPA1500 ATU question

What I do is leave the ATU function ON for all bands. If my 6 meter SWR is “really good”, the ATU tune operation (done once in a “training session”) discovers this and selects ATU bypassed as the preferred ATU setting. Both ATU LEDs are illuminated, indicating that the ATU function is enabled,

Re: [Elecraft] KPA1500 ATU question

The easiest way is to set the defaults per band in the KPA1500 Utility. Tim On Tue, Sep 13, 2022 at 10:11 AM Jorge Diez - CX6VM wrote: > hello > > How can I use the KPA1500 to remember what bands need ATU IN and what bands > need ATU BYP? > > I have ATU IN on HF bands, but when I change to 6

[Elecraft] KPA1500 ATU question

hello How can I use the KPA1500 to remember what bands need ATU IN and what bands need ATU BYP? I have ATU IN on HF bands, but when I change to 6 mts I need that KPA1500 change to ATU BYP Is this possible? thanks! -- 73, Jorge CX6VM/CW5W

Re: [Elecraft] KPA1500 ATU band/bin operation

Thanks for the good explanation Dick.  It got by me that the bins are storing the ant port# along with the tuner settings.  That should work well having 2 antennas on every band if needed.  Adding a 3rd might be cumbersome but more then I need for now anyway... I'll think about that later.

[Elecraft] KPA1500 ATU band/bin operation

Hi Gary, I have two large vertical loops for 160 - 40 M each is directional NE/SW & NW/SE. As long as each antenna presents a fairly low SWR to the tuner, you will be ok. If, say, both antennas are at or below 3:1 SWR when tuner is bypassed, at a particular frequency, you should be ok

Re: [Elecraft] KPA1500 ATU band/bin operation

Gary: If the Xcvr provides freq info (a K3 menu enable is required), the KPA1500 selects new ATU settings as the K3 Tx VFO changes (a bit after VFO motion ceases), without waiting for a transmission. The KPA1500 chooses the most recently stored ATU setting in the new “bin”. On transmission,

[Elecraft] KPA1500 ATU band/bin operation

I'm thinking of replacing an old SPE amp with a KPA1500. I have 4 antennas: 10/15/20 yagi, 40M yagi, 80/160 dipole and an all band hytower vertical so will probably have 3 switched antennas to one antenna port on the KPA1500 and 1 antenna to the 2nd antenna port. After 'training' on all

[Elecraft] KPA1500 ATU Memories

My thanks to Dick & Dave. Using the Utility program sorted out my problem. I now can only have the ATU on 80M & 160M 73 Ray G3XLG __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help:

Re: [Elecraft] KPA1500 ATU Memories

ecraft-boun...@mailman.qth.net On > Behalf Of Ray Spreadbury via Elecraft > Sent: Monday, September 9, 2019 09:23 > To: elecraft@mailman.qth.net > Subject: [Elecraft] KPA1500 ATU Memories > > In my station I have a SteppIR yagi for 20M - 6M, a rotatable Optibeam > dipole for 30M &

Re: [Elecraft] KPA1500 ATU Memories

tember 9, 2019 09:23 To: elecraft@mailman.qth.net Subject: [Elecraft] KPA1500 ATU Memories In my station I have a SteppIR yagi for 20M - 6M, a rotatable Optibeam dipole for 30M & 40M and a wire dipole for 80m &160M. The SteppIR & Optibeam are both resonant antennas & I use the KPA

[Elecraft] KPA1500 ATU Memories

In my station I have a SteppIR yagi for 20M - 6M, a rotatable Optibeam dipole for 30M & 40M and a wire dipole for 80m &160M. The SteppIR & Optibeam are both resonant antennas & I use the KPA1500 in ATU Bypass. However I need the ATU for the 80M wire dipole when moving from the CW end to the

[Elecraft] KPA1500 ATU

"Ever since I received my KPA1500 (SN 00178), I've observed that the ATU  sometimes won't achieve a match better than about 1.4:1, even though the antenna SWR is well within range." What is the SWR stop threshold set to. It's controlled by serial command (^STS) and I assume that, like the

Re: [Elecraft] KPA1500 ATU

I'm seeing a similar phenomenon, Scott, but figured I'm too much of a newbie with the amp to question it. 73, Pete N4ZR Check out the Reverse Beacon Network at , now spotting RTTY activity worldwide. For spots, please use your favorite "retail" DX cluster. On 2/6/2019

Re: [Elecraft] KPA1500 ATU

/ / / -- Original message-- *From: *K9MA *Date: *Wed, Feb 6, 2019 10:50 *To: *elecraft@mailman.qth.net <mailto:elecraft@mailman.qth.net>; *Cc: * *Subject:*[Elecraft] KPA1500 ATU Ever since I received my KPA1500 (SN 00178), I've observed that the ATU sometimes won't achieve a match bette

Re: [Elecraft] KPA1500 ATU

Scott, Did you try testing with a 50 ohm dummy load instead of an antenna?  How goes it react? Ken WA2LBI LG G6  -- Original message--From: K9MADate: Wed, Feb 6, 2019 10:50To: elecraft@mailman.qth.net;Cc: Subject:[Elecraft] KPA1500 ATU Ever since I received my KPA1500 (SN 00178), I've

[Elecraft] KPA1500 ATU

Ever since I received my KPA1500 (SN 00178), I've observed that the ATU sometimes won't achieve a match better than about 1.4:1, even though the antenna SWR is well within range. (ATU STOP TUN SWR = 1.0:1, tune power 40 W) Now, 1.4:1 doesn't sound that high, but the amplifier will often not

[Elecraft] KPA1500 ATU Replacement

Just did the ATU replacement on SN 0178. It seems to solve the problems of half the display going blank on 10 meters, and the SWR indicators flashing on 40. The procedure is quite straight-forward, mainly involving removing and replacing a large number of little screws. It took about an hour. 

Re: [Elecraft] KPA1500 ATU TUNE/MODE button Q.

If you HOLD the ATU TUNE button, you switch the ATU between IN and BYPASS. When you tap ATU tune, and provide some RF from the exciter, the ATU searches for a match. If the SWR of the antenna is good enough without ATU reactances, the ATU discovers that the best tuning solution for that

[Elecraft] KPA1500 ATU TUNE/MODE button Q.

I was noticing that when I hold the ATU TUNE/ATU MODE button, the BYPASS led above it always stays on. The IN led will switch on and off as I hold the button a second time, but the bypass led will always remains on. I don't hear any relays latch. This happens on all bands, except for 30m. On

Re: [Elecraft] KPA1500 ATU

I'll try that, but I suspect the delay in switching the ATU will persist.  I'd like the option to turn off that delay, so the beginning of my call isn't cut off. 73, Scott K9MA On 5/22/2018 07:13, Buck wrote: After you've trained the ATU, switch it to manual mode k4ia, Buck K3# 101 Honor

Re: [Elecraft] KPA1500 ATU

After you've trained the ATU, switch it to manual mode k4ia, Buck K3# 101 Honor Roll 8B DXCC EasyWayHamBooks.com On 5/21/2018 11:43 PM, K9MA wrote: After "training" the ATU across part of the band and, I think, setting up the K3 so it should track, I notice some strange behavior.  As I tune

[Elecraft] KPA1500 ATU

After "training" the ATU across part of the band and, I think, setting up the K3 so it should track, I notice some strange behavior.  As I tune to a different segment of the band, and stop, there's a delay or a second or so before the ATU relays switch. Other times, even though it's already

Re: [Elecraft] KPA1500 ... ATU tune cycle must be initiated manually since key line interrupter is installed

th.net Subject: RE: [Elecraft] KPA1500 ... ATU tune cycle must be initiated manually since key line interrupter is installed Tnx Dick …. Sounds like that will work … I’ll take a close look at it …. The big microHam cable assembly between MK2R+ and K3 is currently using the K3 straight key jack

Re: [Elecraft] KPA1500 ... ATU tune cycle must be initiated manually since key line interrupter is installed

...@elecraft.com Sent: Wednesday, March 7, 2018 7:02 PM To: 'Don Butler'; elecraft@mailman.qth.net Subject: RE: [Elecraft] KPA1500 ... ATU tune cycle must be initiated manually since key line interrupter is installed You might run a cable from the KPA1500 back panel TUNE connector to the K3 straight key input

Re: [Elecraft] KPA1500 ... ATU tune cycle must be initiated manually since key line interrupter is installed

riginal Message- From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On Behalf Of Don Butler Sent: Wednesday, March 7, 2018 17:17 To: elecraft@mailman.qth.net Subject: [Elecraft] KPA1500 ... ATU tune cycle must be initiated manually since key line interrupter is instal

[Elecraft] KPA1500 ... ATU tune cycle must be initiated manually since key line interrupter is installed

I’m just getting to know my new KPA1500 and am having a ball doing so …. it is a gem!one minor problem: I’m using the key line interrupter in the Aux cable since I am keying through a microHam MK2R+ (the K3S/KPA1500 is one of two radios connected through the MK2R+ ….. so the key line must

Re: [Elecraft] KPA1500 ATU - ability to handle more than two antennas

Wayne, Thanks for the response. I waited to respond until the KPA1500 manual was published to see if there were any PF1/PF2 functions out of the box. What I'd like to see first is much less fancy than interacting with external relay-based antenna switching like you mentioned. How about

Re: [Elecraft] KPA1500 ATU - ability to handle more than two antennas

I considered buying the Expert 2K, but decided against it because there was no apparent way to tie the ATU into my antenna switch.  I'm not sure there is  or will be with the KPA1500, either, but it is much more attractive based on Elecraft's reputation.  Besides, I've since built an external

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

Re: [Elecraft] KPA1500 ATU - ability to handle more than two antennas

I designed my station controller over 20 years ago.  Since I'm a hardware designer, it's all hardware. I suppose, however, something like your Arduino could be programmed to read the antenna switch and send a serial command to the amplifier, though that seems a lot of trouble. 73, Scott K9MA

Re: [Elecraft] KPA1500 ATU - ability to handle more than two antennas

My switch uses an Arduino to read the band lines from the K3 and select the last antenna(s) used on that band. It the code could easily be modified to tell an antenna tuner -- in the K3, an amp, or separate -- which antenna system is in use. Manual switching is with a button for each antenna.

Re: [Elecraft] KPA1500 ATU - ability to handle more than two antennas

I don't think it's desirable to have the amplifier controls external antenna relays.  One might sometimes want to operate barefoot.  Besides, there are external antenna relay boxes available, as well as programmable controllers.  (And a few of us dinosaurs are using homebrew antenna

Re: [Elecraft] KPA1500 ATU - ability to handle more than two antennas

I think this is a very important aspect of station design and a big consideration for any future amp purchase I make. I'd like to respectfully suggest that Elecraft consider designing a bulletproof 16x2 antenna switch rated for 5KW and 10:1 SWR (and lots of isolation between ports) that

Re: [Elecraft] KPA1500 ATU - ability to handle more than two antennas

How about using an external switch to select which ATU settings the amp uses?  Perhaps with a digital INPUT line? Scott K9MA On 1/26/2018 11:15, Wayne Burdick wrote: This is definitely doable from the amp. All it takes is an external antenna switch with a control port compatible with RS232,

Re: [Elecraft] KPA1500 ATU - ability to handle more than two antennas

This is definitely doable from the amp. All it takes is an external antenna switch with a control port compatible with RS232, Ethernet, USB, or one of the amp’s multi-purpose digital output lines. (These have other uses, too, such as SWR alarm output.) To select among antennas from the amp,

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,

Re: [Elecraft] KPA1500 ATU - ability to handle more than two antennas

I'm concerned about the same issue:  Multiple antennas on one band. I have an automated antenna selection system.  In addition to following the band data from the transceiver, there are switches to select antennas.  I frequently have to very quickly switch antennas, so it must involve only a

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

[Elecraft] KPA1500 ATU - ability to handle more than two antennas

I use the band data from my K3S's to select the appropriate antenna and bandpass filters. John KK9A Dan AE9K dan at ae9k.com Thu Jan 25 14:48:50 EST 2018 While I'm awaiting the delivery of my KPA1500 I'm wondering if/how the amp's ATU can accommodate more than two antennas. For example, if I

Re: [Elecraft] KPA1500 ATU - ability to handle more than two antennas

Dan, The KPA1500’s firmware is written to accommodate many more antennas. It would be a fairly simple matter to externalize a number of them in the form of a remote-controlled antenna switch. This is a good example of how the amp can be tailored to user needs. The firmware could be updated

[Elecraft] KPA1500 ATU - ability to handle more than two antennas

While I'm awaiting the delivery of my KPA1500 I'm wondering if/how the amp's ATU can accommodate more than two antennas. For example, if I have an antenna switch connected to one of the amp's antenna jacks is there a facility on the amp that would allow me to choose one of two /logical/ antennas