Re: [Elecraft] KPA1500 - temp reading drops 10C when under power

I'd say a bit of common mode current on the feed line.    I see that from time to time with my KPA500 on certain bands/antennas. 73 Bob, K4TAX On 8/17/2018 11:45 PM, Jeff Blaine wrote: While running the KPA1500 in the SARTG tonight, I noticed that the temp reading drops about 10C when

Re: [Elecraft] KPA1500 - temp reading drops 10C when under power

Yea, I was on 40m also.  So there's a second data point. Did not notice it before - but having watched it pretty consistently tonight, I will know what to look for on other bands.  Tonight was the first night I had the chance to run it on RTTY and want to be sure the thing is ready for prime

Re: [Elecraft] KPA1500 - temp reading drops 10C when under power

I noticed this problem shortly after getting my 1500 back in May.  I only see this problem on 40 mtrs for some reason.  I've never seen a 10 degree fluctuation but itis regularly 6 degrees and has approached 8 degrees.   I only work cw for the most part.  I see it all the time when the duty

[Elecraft] KPA1500 - temp reading drops 10C when under power

While running the KPA1500 in the SARTG tonight, I noticed that the temp reading drops about 10C when transmitting.  min fan speed 1. Seems to be related to power - at 1500W it's pretty close to 10C.  At lower powers, it's less of a difference.  I don't recall seeing that before. Normal?

Re: [Elecraft] [KPA1500] Auto start KPA1500-Remote in host mode

I am running "Pro" like that makes a difference. Only if the workstation is joined to an Active Directory Domain, and then through Domain Policy-- can you disable the Windows Updates on Win 10. All I can do is postpone it for an extended time. Eventually, it will take an update and reboot.

Re: [Elecraft] [KPA1500] Auto start KPA1500-Remote in host mode ?

Take a look at Autohotkey. It is a scripting language for Windows that can do things like simulate key presses and mouse clicks, and a whole bunch more. If you can write it in their scripting language and compile it to an executable, that can be run on startup. I use it to automate the

Re: [Elecraft] KPA1500 WAKE ON LAN problem

I've been told you need to wake the thing up with a bunch of semicolons. Also, Wake-on-LAN is a directed special packet that maybe is not going over the wire correctly? My KPA1500 is near my K3, so I've been using the K3/K3S rear panel 12V DC OUT RCA connector to the KPA1500 REM RCA connector to

[Elecraft] KPA1500 WAKE ON LAN problem

I 'm controlling my KPA1500 over the LAN. The LAN connection is via a WIFI/ETHERNET bridge. I have WAKE ON LAN ENABLED. If the power on the KPA1500 front panel is OFF, LOCAL CONNECT will occasionally not find the KPA. This problem appears to occur after a long disconnect such as over night.

[Elecraft] [KPA1500] Auto start KPA1500-Remote in host mode ?

Loaded the KPA1500 remote software this evening. Some observations: 1) Cannot run local *and* remote server host simultaneously when using USB connectivity. I am hoping this limitation can be overcome when I add an Ethernet cable at the remote site in addition to USB connectivity. Reason?

Re: [Elecraft] [KPA1500] Auto start KPA1500-Remote in host mode ?

Only if you have the pro version. Microsoft is trying to protect us amateurs ;-) Mike - W0AG On Wed, Aug 15, 2018 at 5:41 PM GWK wrote: > Can you shut off the Win 10 automatic update? You could on older > Windows versions. > > > __

Re: [Elecraft] [KPA1500] Auto start KPA1500-Remote in host mode ?

Can you shut off the Win 10 automatic update? You could on older Windows versions. George, W3HBM On 8/15/2018 2:43 PM, Warren Merkel wrote: I'm looking to get the KPA1500-Remote utility to survive these darn Windows 10 forced reboots after Windows Update.   I can get the KPA1500 Remote

[Elecraft] [KPA1500] Auto start KPA1500-Remote in host mode ?

I'm looking to get the KPA1500-Remote utility to survive these darn Windows 10 forced reboots after Windows Update.   I can get the KPA1500 Remote utility to auto-start FB after a reboot. However, it doesn't remember it was in "Host Remote" mode and just comes up waiting for mouse clicks that

Re: [Elecraft] KPA1500 - adding fans

The kind of noise the amp makes is related to but a separate issue to the loudness.  Last night I was doing some comparison listening while trying to find some DX on 20m and noticed that while the FAN2 setting was definitely louder than FAN1, it seems a more "pleasant" noise compared to FAN1

Re: [Elecraft] KPA1500 - adding fans

This is an excellent post, and I agree with all of it. I will add that acoustic considerations also STRONGLY affect the noise produced in any ventilation system, and it is science more than an art. The engineers who specialize in this field are called acoustic consultants, their formal

Re: [Elecraft] KPA1500 - adding fans

My KPA1500 is S/N 00059. I don't operate full power all the time. I live in a compromised antenna area, and so I will use the amp as required to make contacts that are difficult assuming I can hear the station well enough to have the QSO. I have not had problems with the weird display issue that

Re: [Elecraft] KPA1500 - adding fans

Very good info Tony. Saves me the experiment. I think it also shows that the guys at Elecraft did a good job in cooling design. Richard *W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU, J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV *Be joyful in hope,

[Elecraft] KPA1500 - adding fans

For the heck of it brought my KPA1500 from the basement to the shack desk. Ran a test with 10 CQ’s on 6M with 1K out on FT8. By the time the CQ’s were done the amp temp was up to about 75C. The amp is set so the fan is always on at #1. Added two 4” 110VAC fans in series to cut down the speed and

[Elecraft] KPA1500

The amp arrived in fine shape and am getting familiar with all the features. I have some questions: Is there an input attenuator normally in-line? I can't figure out how to manually change the L and C values for the tuner. If these are changed, are the settings memorized? 73, Roger N1RJ

Re: [Elecraft] KPA1500 Client/Server Software

Not sure what you want to do here, but when running KPA1500 Remote in its client/server configuration you can make control changes and monitor the amp via either the client or the server instance, running on different computers, and they follow each other. I've seen no discrepancies. In my shack,

Re: [Elecraft] KPA1500 Client/Server Software

At 03:59 PM 8/6/2018, you wrote: The KPA1500 Remote s/w, which should be on our website later this week, supports both a local operation via direct connection via USB or ethernet to the amp. Will I be able to control the KPA1500 using 2 different programs simultaneously, one talking via

Re: [Elecraft] KPA1500 Client/Server Software

The KPA1500 Remote s/w, which should be on our website later this week, supports both a local operation via direct connection via USB or ethernet to the amp. This s/w also supports client/server operation when there is a computer running the K3Remote s/w at each end. (with the same user

Re: [Elecraft] KPA1500 Remote Software Update

It will be up on the website a little later this week. We're finishing up testing and should have it up shortly. 73, Eric /elecraft.com/ On 8/1/2018 6:04 AM, Paul Christensen wrote: "The link will be back soon. We found a few bugs in the remote sw and temporarily pulled it from the ftp site.

[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. 

[Elecraft] KPA1500 Remote Software Update

>"The link will be back soon. We found a few bugs in the remote sw and temporarily pulled it from the ftp site. Stay tuned! We'll announce here when it is back up next week. Eric /elecraft.com/" Any further updates on when the KPA1500 Remote Software will become available for download?

Re: [Elecraft] KPA1500 noob questions

On 7/24/2018 9:23 AM, Hisashi T Fujinaka wrote: I probably want to run anywhere from 100W - 500W out of the KPA1500 for certain digital modes as well as higher power on other modes. FWIW, I'm running FT8 at 1400W on 6M with a borrowed KPA1500. Depending on which wattmeter you believe, it

[Elecraft] KPA1500 noob questions

My KPA1500 SN 307 is up and running and no longer setting off my fire alarm! :) This is my first external amp so I guess I have simple questions on usage. How do you switch the amp on and off and how do you change power from just using 0-100W on the exciter vs. more power out of the amp? Just

Re: [Elecraft] KPA1500 problem

Elecraft Sent: Friday, July 20, 2018 8:54 PM To: elecraft@mailman.qth.net Subject: [Elecraft] KPA1500 problem I received my new KPA1500 in mid April. After giving it a test drive and making a few QSOs here at home in Madison I took it up to our cabin in northern WI where it will live. I operated

[Elecraft] KPA1500 problem

You probably need a replacement T/R module. Were the pin diodes exposed to super high SWR? John KK9A Jim Fitzpatrick WI9WI Wrote: I received my new KPA1500 in mid April. After giving it a test drive and making a few QSOs here at home in Madison I took it up to our cabin in northern WI

Re: [Elecraft] KPA1500 problem

It sounds like the PIN diode switches are either stuck in the transmit position, or the receive path has failed. Since a mechanical relay bypasses the PIN diode switches in STBY, received signals would then get through normally. 73, Scott K9MA On 7/20/2018 19:54, Jim Fitzpatrick via Elecraft

Re: [Elecraft] KPA1500 problem

Jim, No answers here, but email supp...@elecraft.com. I have heard of this sort of problem before, but do not know the answer. 73, Don W3FPR On 7/20/2018 8:54 PM, Jim Fitzpatrick via Elecraft wrote: I received my new KPA1500 in mid April. After giving it a test drive and making a few QSOs

[Elecraft] KPA1500 problem

I received my new KPA1500 in mid April. After giving it a test drive and making a few QSOs here at home in Madison I took it up to our cabin in northern WI where it will live. I operated the Florida QSO party with it, as well as the ARRL VHF contest with no problems. I also made quite a few

Re: [Elecraft] KPA1500 latest firmware

Scott, again if you have missed it, Elecraft has an 'ATU update Kit' for this purpose. Mine is to be shipped "soon." It is a PC filter board to be installed. 73,Roy K6XK SN 0178: With FW 1.64, the flashing SWR LED problem seems to be gone. On 10 meters, the display no longer goes

Re: [Elecraft] KPA1500 latest firmware

SN 0178: With FW 1.64, the flashing SWR LED problem seems to be gone.  On 10 meters, the display no longer goes half blank, but some extraneous characters show up when transmitting, but it returns to normal on receive. A big improvement, though perhaps eventually a bypass capacitor might be

Re: [Elecraft] KPA1500 latest firmware

Mines #244 about a month old. I have used it a lot on 6M but very little on 10M with no obvious problem. - Paul KW7Y At 09:17 AM 7/20/2018, Roy Koeppe wrote: They must have made an "improvement" on some models since yours! Roy K6XK Iowa I am apparently fortunate. My KPA1500

Re: [Elecraft] KPA1500 latest firmware

They must have made an "improvement" on some models since yours! Roy K6XK Iowa I am apparently fortunate. My KPA1500 is #29 and does not have that issue at full power out on 10 or 6. Ed.. AB4IQ Hi Paul, When attempting to transmit or 10 or 6 meters, the left half of the

Re: [Elecraft] KPA1500 latest firmware

To: Elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA1500 latest firmware Hi Paul, When attempting to transmit or 10 or 6 meters, the left half of the display instantly blanks out and remains that way till you reboot the amp power switch. Has been reported by several with early serial numbers like my #160

Re: [Elecraft] KPA1500 latest firmware

Baldock Sent: Friday, July 20, 2018 9:36 AM To: Roy Koeppe ; Elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA1500 latest firmware Could you describe this problem. I have not seen it. - Paul KW7Y At 05:27 AM 7/20/2018, Roy Koeppe wrote: Now am waiting for the promised ATU upgrade kit to fix

Re: [Elecraft] KPA1500 latest firmware

Could you describe this problem. I have not seen it. - Paul KW7Y At 05:27 AM 7/20/2018, Roy Koeppe wrote: Now am waiting for the promised ATU upgrade kit to fix the main display cut out problem which occurs on 10 __ Elecraft

[Elecraft] KPA1500 latest firmware

Yesterday I updated KPA1500 Utility version and then firmware. That corrected the occasional random flashing of the SWR LED bar display curse on my s/n 160. Glad! Now am waiting for the promised ATU upgrade kit to fix the main display cut out problem which occurs on 10 and 6 meters. 73,

Re: [Elecraft] KPA1500 latest firmware

The link will be back soon. We found a few bugs inthe remote sw and temporarily pulled it from the ftp site. Stay tuned! We'll announce here when it is back up next week. Eric /elecraft.com/ On 7/17/2018 10:00 PM, Paul Baldock wrote: Listed under new features for 01.64 7-12-2018  is

[Elecraft] KPA1500 latest firmware

Listed under new features for 01.64 7-12-2018 is Support for Elecraft Remote Software, ver 1.0.4.0. This suggests that the remote software is now available. However the link appears not to work. Is the remote software

Re: [Elecraft] KPA1500 fan activation temp.

AM To: Elecraft Reflector Subject: [Elecraft] KPA1500 fan activation temp. Does anyone know, at what temp. The fan should come on (level -1) on the KPA1500? Thanks Ron Genovesi n3...@coastside.net __ Elecr

[Elecraft] KPA1500 fan activation temp.

Does anyone know, at what temp. The fan should come on (level -1) on the KPA1500? Thanks Ron Genovesi n3...@coastside.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft

Re: [Elecraft] KPA1500 power supply noise

Hi Don, I hear nothing at all from my supply there or anywhere else so far. My power supply is under the table on a low stand, so is less than 3 feet from the K3s. Just FYI, but it seems I would hear something. 73,Roy K6XK Iowa I just received my new KPA1500 last

[Elecraft] KPA1500 power supply noise

I just received my new KPA1500 last Thursday.  Ser. No. 316.  I ordered it in Visalia on April 20. Tested it out on all bands and I am a very happy camper.  I decided to place the power supply about 8 inches to the left of my K3 on a small shelf. I discovered that on 15 M, 21.020, I get a

Re: [Elecraft] KPA1500 install on side

I've run my PS on the side. No issues there. I assume you could run the RF deck on it's side, although the controls would looks a bit odd in my opinion. Do you really want your RF to be 90 degrees out of phase? Lou, W0FK - St. Louis, MO "The difference between stupidity and genius is

[Elecraft] KPA1500 install on side

Can the KPA1500 and power supply be mounted on it's side? 73/jeff/ac0c alpha-charlie-zero-charlie www.ac0c.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post:

Re: [Elecraft] KPA1500 with K3 Remote question

When the clutch failed at a Spec Miata race at Miller Motorsports Park UT, I used this method to start, run, and complete the race. My lap tap dropped about two seconds, but I still placed in the middle of the pack. The clutch didn't suffer nor would I expect the KPA1500 to suffer using this

Re: [Elecraft] KPA1500 with K3 Remote question

And, BTW, this was the only way to get home after the clutch bracket failed and left you connected. You could start in 1st gear, and with care, do your shifting without the clutch. I'm sure most of us old timers remember doing that upon occasion! George, W3HBM On 7/2/2018 1:46 PM, Bob

Re: [Elecraft] KPA1500 with K3 Remote question

Yes true and the KPA500 has a like menu to power up in Operate mode.   At the same time, I think bringing a station up in Operate mode is much like starting a car in gear.  Oh by the way, older cars and trucks with manual transmissions, column or floor shift,  could be started in gear.  Not

Re: [Elecraft] KPA1500 with K3 Remote question

Thanks. I found it. All good now. On Mon, Jul 2, 2018 at 11:33 AM Paul Baldock wrote: > KPA1500 has a menu setting to turn on in OPERATE. > > - Paul KW7Y > > At 07:57 AM 7/2/2018, Bob McGraw K4TAX wrote: > >I agree as I like to check antennas before operating. Less smoke > >comes out of the

Re: [Elecraft] KPA1500 with K3 Remote question

KPA1500 has a menu setting to turn on in OPERATE. - Paul KW7Y At 07:57 AM 7/2/2018, Bob McGraw K4TAX wrote: I agree as I like to check antennas before operating. Less smoke comes out of the boxes that way. Bob, K4TAX Sent from my iPhone > On Jul 2, 2018, at 9:40 AM, Wes Stewart wrote:

Re: [Elecraft] KPA1500 with K3 Remote question

There is a KPA1500 Power On menu item for operate or standby. 73 de Dick, K6KR Sent from my iPhone > On Jul 2, 2018, at 07:13, Brian F. Wruble wrote: > > I have just installed my new KPA1500 with my K3. I have run a line from > the 12V jack on the K3 ro the "remote" jack on the KPA1500.

Re: [Elecraft] KPA1500 with K3 Remote question

I agree as I like to check antennas before operating. Less smoke comes out of the boxes that way. Bob, K4TAX Sent from my iPhone > On Jul 2, 2018, at 9:40 AM, Wes Stewart wrote: > > If it's like a KPA500, you can have it go to Operate when powered on. Menu > "PWR ON = OPER" > > Caveat,

Re: [Elecraft] KPA1500 with K3 Remote question

If it's like a KPA500, you can have it go to Operate when powered on.  Menu "PWR ON = OPER" Caveat, I don't use the K3 to turn on the amp.  Separate operation. Wes  N7WS On 7/2/2018 7:13 AM, Brian F. Wruble wrote: I have just installed my new KPA1500 with my K3. I have run a line from the

Re: [Elecraft] KPA1500 with K3 Remote question

There's a menu item on the KPA1500 to make it come up in operate mode. 73, Scott K9MA On 7/2/2018 09:13, Brian F. Wruble wrote: I have just installed my new KPA1500 with my K3. I have run a line from the 12V jack on the K3 ro the "remote" jack on the KPA1500. When I turn on the K3, the

[Elecraft] KPA1500 with K3 Remote question

I have just installed my new KPA1500 with my K3. I have run a line from the 12V jack on the K3 ro the "remote" jack on the KPA1500. When I turn on the K3, the KPA1500 also comes on, but in standby mode. Does anyone have a macro for the K3 that will cause it to switch to "Operate"? Tnx es 73 de

[Elecraft] KPA1500 utility for Mac and linux now available.

Carl Yaffey K8NU Recording studio. cyaffeyno_s...@gmail.com 614 268 6353, Columbus OH http://www.carl-yaffey.com http://www.grassahol.com http://www.bluesswing.com __ Elecraft mailing list Home:

Re: [Elecraft] KPA1500 Client/Server Software

We are already in test with both client server sw (Similar to KPA500 and KAT500 remote) and also client direct to the amp via local ethernet or usb. Stay tuned! We will announce here when it is ready. 73, Eric elecraft.com _..._ > On Jun 27, 2018, at 4:53 AM, Paul Christensen wrote: > >

[Elecraft] KPA1500 Client/Server Software

Is there any news from Elecraft or a third-party developer concerning KPA1500 client/server software? Some of us, and likely many more ops, need the ability to control the amp from a remote desktop without the need of desktop replication software like TeamViewer and VNC. N4CC and I share his

[Elecraft] KPA1500 delivery

Update: ordered 4/24 has been shipping today. From everything I have read and know about the amp, can't wait to wire into 240v and get on the air. Need more power!!!@ Tired of not making marginal contacts on all bands to 6m. QRPpp is my preferred mode when condx are there. 72 & 73, Bill

Re: [Elecraft] KPA1500 Linearity

To make these kinds of measurements with amateur equipment and accuracy, I suggest acquiring some directional couplers and/or high power attenuators.  A spare K3 or a decent SDR receiver then makes an excellent "power meter" with significant dynamic range.  Gain measurements are really ratio

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

Re: [Elecraft] KPA1500 Linearity

Yes, the linearity of the two power meters is suspect. However, the compression of interest is near the high end for that of both the KPA1500 and the K3, so I wouldn't expect their nonlinearity there to make much difference. Note that absolute accuracy isn't critical. 73, Scott K9MA On

Re: [Elecraft] KPA1500 Linearity

Yes and most power meters are voltage sensing instruments which are calibrated to a specific value or load.  Thus is the load being used may not be the identical value to which it was calibrated, hence another error enters the equation. To wit, I have 3 "allegedly" 50 ohm dummy loads.  Only

Re: [Elecraft] KPA1500 Linearity

Most, if not all analog measurement devices are spec'd at % of full scale which can lead to high absolute variances if the levels being measured are significantly below full scale.  A Bird with a 100W slug accurate to 10% of full scale [+/- 5W] would be within spec if it indicated a real 10 W

Re: [Elecraft] KPA1500 Linearity

John, You are exactly right for bring that factor to attention. Typically wattmeters use diodes in their detectors, and the response will vary by frequency and by the power level. I would trust only something that has been calibrated to NIST traceable standards. The Telepost LP-100 is one

Re: [Elecraft] KPA1500 Linearity

Hi Scott, I wonder how the linearity of the two power meters was evaluated? Some years ago I checked the K3 and KX3 power meter against two other meters. They were just within 10% http://www.kn5l.net/Elecraft/Power.html John KN5L On 06/19/2018 04:56 PM, K9MA wrote: > I just repeated the

[Elecraft] KPA1500 Linearity

I just repeated the linearity measurements, on both 40 and 15 meters.  I used the KPA1500 meter to measure output, and the K3 power setting for input.  Results on the two bands were similar, though 15 required much more drive. On 40, the maximum gain occurred at about 800 W out, 17.2 dB.  At

Re: [Elecraft] KPA1500 and KPA500 set up question

On Tue, Jun 19, 2018 at 10:55 AM, Earl wrote: > Presently I have the K3/KPA500/KAT500 in line with the AUX Cable connected > to a N6TV Y-BOX. > > I now have the KPA1500 connected to the Y-BOX also. All looks good. > > Presently the KPA500 powers on when the K3 is turned on. > > Is there a

Re: [Elecraft] KPA1500 and KPA500 set up question

On Behalf Of Earl Sent: Tuesday, June 19, 2018 12:55 PM To: Elecraft Subject: [Elecraft] KPA1500 and KPA500 set up question Received my new KPA1500 yesterday ordered early March. Yea!! Presently I have the K3/KPA500/KAT500 in line with the AUX Cable connected to a N6TV Y-BOX. I now have

[Elecraft] KPA1500 and KPA500 set up question

Received my new KPA1500 yesterday ordered early March. Yea!! Presently I have the K3/KPA500/KAT500 in line with the AUX Cable connected to a N6TV Y-BOX. I now have the KPA1500 connected to the Y-BOX also. All looks good. Presently the KPA500 powers on when the K3 is turned on. Is there a

[Elecraft] KPA1500 connecting cable to K3

Since the N6TV Y-Box works using two 2 1/2' cables, you should have no issues. Longer DE15 cables are available if you look hard enough. John KK9A Bill Stravinsky k3wjv wrote: I purchased two aux cables so I could put the amp on a separate side table with my Acom 2000A. It was interesting

Re: [Elecraft] KPA1500 connecting cable to K3

I purchased two aux cables so I could put the amp on a separate side table with my Acom 2000A.  It was interesting that I never got a direct answer on theexact length of a single cable, hi, but the two cables together were a perfect decision. BillK3WJV On Saturday, June 16, 2018, 10:31:43

Re: [Elecraft] KPA1500 connecting cable to K3

Art, The KPA1500 to K3 cable is 5 feet long. Yes, it can be extended, but about 10 feet is the limit. The limiting factor is the response time on the single wire communications bus over the AUXBUS line. 73, Don W3FPR On 6/16/2018 10:24 AM, Art via Elecraft wrote: Is there any provision

[Elecraft] KPA1500 connecting cable to K3

Is there any provision for extending the standard Elecraft cable that is only about 3 ft to accommodate placement of the 1500 a little further away? 6 or 7 ft. would be ideal in my situation. 73, Art KZ5D __ Elecraft mailing list

Re: [Elecraft] KPA1500 Linearity

I'll have to make some more measurements, but Paul's seem to have much less gain compression than mine. (0.6 vs 1.4 dB from 1 kW to 1.5 kW) That's also closer to the specs for a pair of BLF88XR's. 73, Scott K9MA -- Scott Ellington --- via iPad > On Jun 15, 2018, at 11:24 PM, Paul

Re: [Elecraft] KPA1500 Linearity

I received my KPA-1500 yesterday (#244) and did some linearity tests today 14.2MHz, Dummy Load, ATU Bypassed. Using KPA-1500 internal Power Meter. Continuous carrier. 10W drive, Gain = 15.6dB 180W 15W drive, Gain = 15.8dB 20W drive, Gain = 15.9dB 25W drive, Gain = 16.0dB 1.0KW 30W drive, Gain

Re: [Elecraft] KPA1500 Linearity

The gain compression I measured, between 1000 and 1500 W on 40 meters, was 1.4 dB. I used the K3 and KPA1500 power meters. Factory calibration of the KPA1500. Scott K9MA -- Scott Ellington --- via iPad > On Jun 14, 2018, at 2:51 PM, Paul Baldock wrote: > > What you report of

Re: [Elecraft] KPA1500 Linearity

What you report of compression near the maximum power is certainly true of the amplifiers like the SPE-1.5K that use a single device, but I would have thought this would not be true of the KPA1500 that uses 2 devices. This is the reason I returned my SPE and ordered the KPA. Hopefully the

[Elecraft] KPA1500 Latest Shipping Status

We've just updated the Elecraft Shipping Status page for the KPA1500: We have been ramping up production and are now preparing to ship orders received through Feb 27th. New Orders should ship 6.5 weeks after day of order, based on our current backlog. Also, check the Elecraft shipping status

[Elecraft] KPA1500 beta firmware 01.49 now available on Elecraft's FTP server

KPA1500 beta firmware 01.49 is now available. See http://www.elecraft.com/KPA1500/kpa1500_software.htm for details on what's in it and how to install beta firmware. The beta folder may contain kpa1500fw0149.hex and kpa1500fwnotes.rtf files or a zip archive that contains these files as

Re: [Elecraft] KPA1500 odd behavior

This is a known issue affecting some units. There’s an easy field modification to correct this (or we can do it for you, at no charge). Please contact support. 73, Wayne N6KR > On Jun 10, 2018, at 6:50 PM, Steve wrote: > > While operating in the ARRL June VHF test on 6m SSB, I noticed that

Re: [Elecraft] KPA1500 odd behavior

Wayne just answered this in an earlier thread, here is is response again; "Richard, This is an issue on a small number of units. We know the cause and have a simple fix. Please call support on Monday. 73, Wayne N6KR On Sun, Jun 10, 2018, 9:51 PM Steve wrote: > While operating in the ARRL June

Re: [Elecraft] KPA1500 odd behavior

I’m told this is a known problem. I’ve seen it on 10 meters. 73, Scott K9MA -- Scott Ellington. K9MA --- via iPhone > On Jun 10, 2018, at 8:50 PM, Steve wrote: > > While operating in the ARRL June VHF test on 6m SSB, I noticed that the main > LCD display lost half of its display

[Elecraft] KPA1500 odd behavior

While operating in the ARRL June VHF test on 6m SSB, I noticed that the main LCD display lost half of its display After a few minutes of on and off transmission. Nothing would bring back the full screen. It would reappear after turning the amp off and then back on. It would then loose half

[Elecraft] KPA1500 delivery

Haven’t seen any posts recently about Delivery based on date ordered. Trying to see how close to my order date in April. Thanks for any updates. 73, Art KZ5D Sent from AOL Mobile Mail __ Elecraft mailing list Home:

Re: [Elecraft] KPA1500 Linearity

On 6/9/2018 2:21 PM, K9MA wrote: While I'm primarily a CW operator, I'd be very reluctant to use the amplifier on SSB. CW is 100% Amplitude Modulation of a carrier by a rectangular wave, so the transitions are rich in harmonics that are heard as clicks, and they WILL excite IM in a

Re: [Elecraft] KPA1500 Linearity

Thank you for posting this.  I have been saying it for years on these forums and getting told that I didn't know what I was talking about.  Now maybe the naysayers will take note. Wes  N7WS On 6/9/2018 6:28 PM, Wayne Burdick wrote: Finally, both the transceiver and amp will vary from band

Re: [Elecraft] KPA1500 Linearity

Thanks, Wayne. I'm glad to hear this isn't typical. I sent a report to tech support with all the details. I'll call later next week, as I'll be out of town with the KX2 until Thursday. 73, Scott K9MA -- Scott Ellington --- via iPad > On Jun 9, 2018, at 8:28 PM, Wayne Burdick

Re: [Elecraft] KPA1500 Linearity

Scott, I don’t know if this helps much but several of the locals have constructed BLF-188 amps (singles and pairs) in the past two years. The W7, Israeli and Russian boards were used and they all suffered the same fate in various degrees. They would cease being very linear at about 75% of

Re: [Elecraft] KPA1500 Linearity

Scott, I’m not sure how you’re doing the test, but this is definitely not characteristic. We test every amp for IMD, and we see an average of about -35 dBc (3rd order, ARRL method) across all bands. This is state of the art for an LDMOS deign running class AB. Other SS amps using similar

Re: [Elecraft] KPA1500 MARS Operation?

, June 09, 2018 11:20 AM To: George Johnson W1ZT Cc: Elecraft Reflector Subject: Re: [Elecraft] KPA1500 MARS Operation? We’re almost finished with MARS characterization, George. When the new firmware is released, the amp will be usable from 2-30 MHz with very few excluded segments. We’ll post

Re: [Elecraft] KPA1500 Linearity

I did look at the K3 output, and it's much, much better than the KPA1500 output. I also checked that the KPA1500 supply voltage was not dropping much: 53 V in standby, 52 V at 1500 W. 73, Scott K9MA -- Scott Ellington --- via iPad > On Jun 9, 2018, at 7:26 PM, Wes Stewart wrote:

Re: [Elecraft] KPA1500 Linearity

I don't have a KPA1500 or enough power attenuators to test my KPA500, but I have spent many dozens of hours looking at TX IMD on my two K3s. I will simply say, if you haven't already, check the IMD of the bare K3 before blaming the KPA1500. Garbage in, garbage out.  That of course doesn't

[Elecraft] KPA1500 Linearity

I recently ran a two-tone test and measured CW power gain. (SN1078)  It doesn't look good.  The two-tone waveform shows distinct "flat-topping", and the power gain drops 25 percent from 1000 to 1500 Watts.  My old 3-500Z amplifier is much better.  Has anyone measured IMD or linearity, or seen

Re: [Elecraft] KPA1500 MARS Operation?

We’re almost finished with MARS characterization, George. When the new firmware is released, the amp will be usable from 2-30 MHz with very few excluded segments. We’ll post full details next week. 73, Wayne N6KR http://www.elecraft.com > On Jun 9, 2018, at 4:49 AM, George Johnson

[Elecraft] KPA1500 MARS Operation?

Looking for status of any MARS update for the KPA1500 for MARS operation. My new amp is fine but just needs that ham band restriction modified as was done for the K3. Have contacted Support but no info other than referral to FAQ which simply says MARS is supported. Thanks for any suggestions,

Re: [Elecraft] KPA1500 Drive Power

, 2018 2:36:52 PM To: Elecraft Reflector Subject: [Elecraft] KPA1500 Drive Power Noone has responded to my previous inquiry about the KPA1500 power drop-off due to heat. I would like to know if the KPA1500 power output actually drops off due to heat build-up or because the SWR display

Re: [Elecraft] KPA1500 Drive Power

Read that: I owned Kpa500... Have a great day, Bill J From: Bill Johnson Sent: Tuesday, June 5, 2018 11:24:08 PM To: Elecraft Reflector; Roy Morris, Jr. Subject: Re: [Elecraft] KPA1500 Drive Power Roy, I owned and will soon have Kpa1500. Yes power will drop

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