Re: [Elecraft] KPA1500 Drive Power

Sent: Tuesday, June 5, 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

Re: [Elecraft] KPA1500 Fan Noise - Not An Issue

Just get a weekly delivery of a large container of liquid nitrogen and rig up a way to spray it on the heatsinks... It can be very quiet, it has a large temperature difference, so it will be efficient, and it may drive the chips into superconducting status which will further improve the

[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 was erroneously showing a power drop before it was fixed.  Thanks,  Roy Morris W4WFB

Re: [Elecraft] KPA1500 Fan Noise - Not An Issue

Frankly I agree with Bob-K4TAX: If you ever have chance to visit the sound booth at either a broadcast station or recording studio, note the use of acoustic tile. The Super-Contest station of KL7RA (sk) is lined with acoustic tile and you note immediately how quiet the room sounds (even with

Re: [Elecraft] KPA1500 Fan Noise - Not An Issue

. This must mean STOP! "Dave, Dave.  What are you doing Dave?" 73, Will, wj9b CWops #1085 CWA Advisor levels II and III http://cwops.org/ On Tue, 6/5/18, Walter Underwood wrote: Subject: Re: [Elecraft] KPA1500 Fan Noise - Not An Issue To:

Re: [Elecraft] KPA1500 Fan Noise - Not An Issue

I would recommend reading the specs. As I remember, it is ICAS, five minutes on, five minutes off. But you should check for yourself. wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Jun 4, 2018, at 5:06 PM, Paul Baldock wrote: > > Can the KPA1500 run brick

Re: [Elecraft] KPA1500 Fan Noise - Not An Issue

Sent: Monday, June 4, 2018 4:19 PM Subject: Re: [Elecraft] KPA1500 Fan Noise - Not An Issue That's fine if cost is no object. Acoustics is part of the problem -- ignore it at your peril. :) 73, Jim K9YC On 6/4/2018 3:06 PM, Mel Farrer via Elecraft wrote: > While I appreciate all of the so

[Elecraft] KPA1500 Drive Power

Does the KPA1500 drive power output actually drop off due to heat build-up or because the SWR display was erroneous before it was fixed.  Thanks,  Roy Morris  W4WFB __ Elecraft mailing list Home:

Re: [Elecraft] KPA1500 Fan Noise - Not An Issue

Can the KPA1500 run brick down 100% duty cycle at 1500W while maintaining the temperature in a safe range? Anybody tried it? - Paul __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help:

Re: [Elecraft] KPA1500 Fan Noise - Not An Issue

A properly damped acoustic environment will enhance the SSB voice on the air.  While a poor acoustic environment will sound like crap, and no amount of EQ , processing or microphone will correct the undesirable artifacts. Give some thoughts to improving your radio room acoustics.   Even a

Re: [Elecraft] KPA1500 Fan Noise - Not An Issue

That's fine if cost is no object. Acoustics is part of the problem -- ignore it at your peril. :) 73, Jim K9YC On 6/4/2018 3:06 PM, Mel Farrer via Elecraft wrote: While I appreciate all of the sound proofing suggestions, the old rule keeps coming back.: " Stop the source as much possible

Re: [Elecraft] KPA1500 Fan Noise - Not An Issue

While I appreciate all of the sound proofing suggestions, the old rule keeps coming back.: " Stop the source as much possible FIRST."  I hate patches.. Mel, K6KBE From: Bob McGraw K4TAX To: elecraft@mailman.qth.net Sent: Monday, June 4, 2018 2:20 PM Subject: Re: [Elecraf

Re: [Elecraft] KPA1500 Fan Noise - Not An Issue

One of my favorite methods of sound treatment is the products in the link following: http://www.sonex-online.com/Pro%20Audio.htm There are many other products, and many individuals use their own creative means to be effective in sound absorption. 73 Bob, K4TAX On 6/4/2018 1:00 PM, Jim

[Elecraft] KPA1500 Signals attenuated in OPER

For some reason, when I switch to operate, signals are significantly attenuated. I know there is an attenuator if reflected power is high but this is just from a fresh start. What am I doing wrong? Tom NY4I Principal Solutions Architect Better Software Solutions, Inc. 727-437-2771

Re: [Elecraft] KPA1500 Fan Noise - Not An Issue

On 6/4/2018 8:34 AM, Bob McGraw K4TAX wrote: Room acoustics play a big part of the "how loud" factor. Absorptive materials applied to the walls an ceiling of a room, specially small rooms,  do reduce the build up of sound / noise emitted from fans and blowers. YES! This is excellent advice.

Re: [Elecraft] KPA1500 Fan Noise

Roughly speaking, both an i7 CPU and a GTX 1070 GPU have power dissipation ratings 150 watts or less, making them each about an order of magnitude less than the likely dissipation in the KPA1500. I actually do like the idea of liquid cooling since it's efficient and flexible if designed

Re: [Elecraft] KPA1500 Fan Noise - Not An Issue

Room acoustics play a big part of the "how loud" factor. Absorptive materials applied to the walls an ceiling of a room, specially small rooms,  do reduce the build up of sound / noise emitted from fans and blowers. 73 Bob, K4TAX On 6/4/2018 10:04 AM, Richard Thorne wrote: Don, Thanks

Re: [Elecraft] KPA1500 Fan Noise - Not An Issue

Don, Thanks for the updated information.  It's quite helpful. For those of you that don't think that fan noise is a potential problem, you need to understand my point of view on this. I've tried very hard to get a good clean noise free signal to my speaker or head phones..  This starts with

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

For everyone complaining about the fan noise, I would gladly trade my KPA500 and KAT500 for your noisy KPA1500 at a reduced rate. With 40% hearing loss, I'd love to hear the KPA1500. I mounted an IBM mainframe cooling fan on top of my SB200 to keep it cool while working DX. You want to hear

Re: [Elecraft] KPA1500 Drive Power

Now I'm really confused.  I observed the power drop when operating several times, as described below. However, I just ran a test, both with an antenna and a dummy load, and saw only a very small change in output, perhaps 50 W, which is inconsequential.  I even tried simulating CW operating in

Re: [Elecraft] KPA1500 Fan Noise - Not An Issue

Well said, Don, and I agree.  Its not an issue with me either.  Even though its my first solid state amp I realize the need to cool it.  They're already up to suggestingwater cooling.  I think we need to talk about hydrogen cooling, something the radio room on the Enterprise from Star Trek

[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 Fan Noise - Not An Issue

- From: elecraft-boun...@mailman.qth.net On Behalf Of Don Butler Sent: Sunday, June 3, 2018 6:33 PM To: elecraft@mailman.qth.net Subject: [Elecraft] KPA1500 Fan Noise - Not An Issue A post this afternoon refered to KPA1500 fan noise as an "issue" that might need to be addressed. I

[Elecraft] KPA1500 Fan Noise - Not An Issue

A post this afternoon refered to KPA1500 fan noise as an "issue" that might need to be addressed. I personally think that is an unfair suggestion. Fan noise with this amplifier is NOT an issue to me. I have made previous comments and have also posted a video on this thread, and if I have given

Re: [Elecraft] KPA1500 Fan Noise

"Water cooling" has come a LONG way from the days back in the 90s when we were machining out own water blocks from aluminum and copper, and trying to construct flow loops that didn't leak, find suitable radiators, etc. But I don't think there are any current CPU/GPU coolers on the market

[Elecraft] KPA1500 low output problems on15, 17, & 20 meters.

Just received SN 209 yesterday. Ordered late Oct 2017. Removed the KPA500 and put the big boy into place, using the same KPA cable to the K3. The K3 controls the amp and the amp band switches the K3, like it should. With between 30 and 40 watts drive I get full power out... except for the

Re: [Elecraft] KPA1500 Fan Noise

There are liquid cooling systems available for CPUs and graphics cards, used by gamers and overclockers. Have no idea how this would compare to cooling a 1500 watt RF power amplifier but probably more analogous than an airplane engine. 73, Drew AF2Z On 06/02/18 17:09, Dauer, Edward wrote:

Re: [Elecraft] KPA1500 Fan Noise Video posted

From: elecraft-boun...@mailman.qth.net On Behalf Of Don Butler Sent: Saturday, 2 June 2018 2:01 PM To: 'Richard Thorne' ; Elecraft@mailman.qth.net Subject: [Elecraft] KPA1500 Fan Noise Video posted In response to N5ZC’s request I just made this short video to provide a listen to the KPA1500

[Elecraft] KPA1500 Fan Noise

Every amplifier has some level of fan noise. My new KPA1500 is seriously quieter than my former Expert 2KFA. My Henry 2K Ultra fans were so loud that I couldn't keep it in the radio room. Luckily I had the remote version. My Harris RF-3230 (all solid state) had 8 six-inch muffin fans! It

Re: [Elecraft] KPA1500 fault

Hi Steve, When plugging in the large 50V power cables between the power supply and rf deck, make sure they are pushed in firmly with -two- distinct insertion clicks. After feeling the first click, push them in further for the second click. We are finding some customers mistakenly think they

[Elecraft] KPA1500 fault

Turned on #121 tonight. Keyed K3 with 15 Watts. Amp immediately went into hard fault mode showing ‘50 VOLTS: 4.5 volts’ recycled and relayed. Immediate hard fault showing ‘50 VOLTS: 2.5 volts’. Next recycle fault shows ‘50 VOLTS: 2.1 volts’ Sounds ominous. Anyone have any ideas? 73 Steve AA4V

Re: [Elecraft] KPA1500 Fan Noise

To: "elecraft@mailman.qth.net" Sent: Saturday, June 2, 2018 2:15 PM Subject: [Elecraft] KPA1500 Fan Noise I have been following this thread with interest because I have a KPA1500 on order, and I have very limited flexibility as to where the RF deck can go compared to where I will have to sit

[Elecraft] KPA1500 Fan Noise

, and use it as a general operating guideline if I need to. Ted, KN1CBR Date: Sat, 2 Jun 2018 08:48:46 -0600 From: Don Butler To: Paul Baldock ,"Elecraft@mailman.qth.net" Subject: Re: [Elecraft] KPA1500 Fan Noise Video posted Message-ID: Content-Type:

Re: [Elecraft] KPA1500 Fan Noise Video posted

So far for the short time I've had the 1500, I've used it very heavily in WPX CW recently.  At constant running , sometimes getting no answers which is probably max duty cyclefor this kind of operating, I never went over about 74 degrees C which kicks in fan speed 3 (I think, hi, I had it

Re: [Elecraft] KPA1500 Fan Noise Video posted

> Sent from Mail for Windows 10 > > From: Paul Baldock > Sent: Saturday, June 2, 2018 8:38 AM > To: Don Butler; Elecraft@mailman.qth.net > Subject: Re: [Elecraft] KPA1500 Fan Noise Video posted > > Does the power supply make any significant noise? > > - Paul > &g

Re: [Elecraft] KPA1500 Fan Noise Video posted

right at the end you can hear when the PS fans stop. Don, N5LZ Sent from Mail for Windows 10 From: Paul Baldock Sent: Saturday, June 2, 2018 8:38 AM To: Don Butler; Elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA1500 Fan Noise Video posted Does the power supply make any significant noise

Re: [Elecraft] KPA1500 Fan Noise Video posted

Does the power supply make any significant noise? - Paul At 11:01 PM 6/1/2018, Don Butler wrote: In response to N5ZC’s request I just made this short video to provide a listen to the KPA1500's fans ... at least as they sound in my shack. Follow this link to view:

Re: [Elecraft] KPA1500 Fan Noise Video posted

...@mailman.qth.net] On Behalf Of Don Butler Sent: Saturday, June 02, 2018 2:01 AM To: 'Richard Thorne' ; Elecraft@mailman.qth.net Subject: [Elecraft] KPA1500 Fan Noise Video posted In response to N5ZC’s request I just made this short video to provide a listen to the KPA1500's fans ... at least

[Elecraft] KPA1500 Fan Noise Video posted

Nice video Don. Speed 4 and 5 might be like trying to operate with the XYL vacuuming around you. I wonder what duty cycle and power level it takes for these speeds to kick in. It was good to see a comparison with the tube amps. My Alphas were hardly noticeable when running but remember they are

Re: [Elecraft] KPA1500 Fan Noise Video posted

The Valve amps do not require such cooling.   73 Doug EI2CN Sent from my Samsung Galaxy smartphone. Original message From: Don Butler Date: 02/06/2018 08:01 (GMT+01:00) To: 'Richard Thorne' , Elecraft@mailman.qth.net Subject: [Elecraft] KPA1500 Fan Noise Video posted

[Elecraft] KPA1500 Fan Noise Video posted

In response to N5ZC’s request I just made this short video to provide a listen to the KPA1500's fans ... at least as they sound in my shack. Follow this link to view: https://vimeo.com/273064144 In addition to the KPA1500 the video also includes footage of my Alpha 9500 and Icom PA1 … each

Re: [Elecraft] KPA1500 LCD Color

Hi John, Amber is not a standard color for this particular display. Sorry about that. Wayne N6KR > On Jun 1, 2018, at 3:44 PM, John Perlick wrote: > > I love the backlight color on my K3/K3S and KX3. I also love my new KPA1500. > But, why oh why did you change to a blue backlight on the

[Elecraft] KPA1500 LCD Color

I love the backlight color on my K3/K3S and KX3. I also love my new KPA1500. But, why oh why did you change to a blue backlight on the KPA1500? Dang, I love that amber color--reminds me of that faded amber color of those old radios, like my RME-45 that I had before my Novice days. Let me

[Elecraft] KPA1500 Serial Number 207 delivered

A brand new KPA1500 Serial number 207 (ordered 10/16/2017) arrived safely today. Great packing job and I was surprised the amp was heavier than the power supply. But they are both lighter than I expected. Now I understand the handle as they are each light enough to trust the handle. Regards,

Re: [Elecraft] KPA1500 Drive Power

On 5/31/2018 1:14 PM, Michael Blake wrote: Are you sure that it is not the K3(s) itself that has unstable output power. I see this occur on my KPA500 and it is not getting hot. Me too. Jim K9YC __ Elecraft mailing list Home:

Re: [Elecraft] KPA1500 Drive Power

Absolutely. I have never seen such fluctuations of either output or grid current with my other amplifiers. Scott K9MA -- Scott Ellington --- via iPad > On May 31, 2018, at 3:14 PM, Michael Blake wrote: > > Are you sure that it is not the K3(s) itself that has unstable output

Re: [Elecraft] KPA1500 Drive Power

Are you sure that it is not the K3(s) itself that has unstable output power. I see this occur on my KPA500 and it is not getting hot. Michael Blake k9...@mac.com > On May 31, 2018, at 4:09 PM, K9MA wrote: > > I agree with Rick: A way to slowly adjust the drive

Re: [Elecraft] KPA1500 Drive Power

I agree with Rick: A way to slowly adjust the drive power automatically to maintain constant peak output would solve the problem. I'd think the KPA1500 firmware could do this with the K3 via the accessory cable. Probably the K3 should revert to its original output when the KPA1500 is cold, or

Re: [Elecraft] KPA1500 Drive Power

I've seen some gain drift with temperature, too. I've wondered if there might be a way to feed back drive power change requests to a K3, or other radio with adequate command capabilities, to maintain a target output power (say, 1500w) as the amp warms and cools. This should be done slowly - on the

[Elecraft] KPA1500 Drive Power

My KPA500 also has slightly inconsistent output. If I recall output drops a little after the first few seconds of key down. Perhaps it is normal for solid state amps as I have never noticed this with a tube amp. This may be more of a concern with a legal limit amp if you want to keep it as close

Re: [Elecraft] KPA1500 Drive Power

: Thursday, May 31, 2018 9:42 AM To: Paul Baldock Cc: Elecraft Reflector Subject: Re: [Elecraft] KPA1500 Drive Power Yes, turning the drive up a bit restores the output to 1500 W. I haven't recorded it, but drive seems fairly flat band to band. (The K3, of course, saves the drive levels for each band

Re: [Elecraft] KPA1500 Drive Power

Yes, turning the drive up a bit restores the output to 1500 W. I haven't recorded it, but drive seems fairly flat band to band. (The K3, of course, saves the drive levels for each band.) 73, Scott K9MA -- Scott Ellington --- via iPad > On May 31, 2018, at 10:16 AM, Paul Baldock

Re: [Elecraft] KPA1500 Drive Power

Yes, it does sound like a solid-state thing. Not enough negative feedback? It may be a reason NOT to run the fans continuously: Once it reaches 60 C, the fan control keeps the temperature fairly stable. 73, Scott K9MA -- Scott Ellington --- via iPad > On May 31, 2018, at 10:10

Re: [Elecraft] KPA1500 Drive Power

Can you safely increase the drive to get it back to 1500W? Another question: Is the drive requirement (amp gain) pretty flat from band to band? - Paul KW7Y At 08:10 AM 5/31/2018, Bill Stravinsky via Elecraft wrote: Yup, as the temp climbs the output drops some. Even though I'm glad I

Re: [Elecraft] KPA1500 Drive Power

Yup, as the temp climbs the output drops some.  Even though I'm glad I got the solid state amp I still prefer tubes, hi.  The drop is anywhere between 100 to maybe 300 watts.I never really noted the exact numbers. BillK3WJV p.s. I'm thinking its a normal solid state thing. On Wednesday,

[Elecraft] KPA1500 issue

While calling CQ in 6m, I glanced at the LCD and saw that it was lit up but blank. Pushing edit and status didn’t restore it. Turning off and back on did. ?? Carl Yaffey K8NU Recording studio. cyaffeyno_s...@gmail.com 614 268 6353, Columbus OH http://www.carl-yaffey.com

[Elecraft] KPA1500 Drive Power

I'm using the K3 with the Elecraft interface cable.  I've noticed the the CW drive power required by mine varies considerably, both with temperature and SWR.  If I set the K3 output for a KPA1500 output of 1500 W output initially, the output will drop to perhaps 1100 W when the temperature

Re: [Elecraft] KPA1500 fan noise concern

net] On Behalf Of j...@kk9a.com > Sent: Monday, May 28, 2018 9:14 PM > To: 'Elecraft Reflector' > Subject: [Elecraft] KPA1500 fan noise concern > > I imagine that due to the KPA1500's size it requires a higher volume of air > than a large amplifier would. Its small size and weight

Re: [Elecraft] KPA1500 Remote Program

program comes out. I will be able to work around that limitation for now. 73, N2TK, Tony From: N2TK, Tony [mailto:tony@verizon.net] Sent: Wednesday, May 30, 2018 7:07 AM To: 'Rick Tavan' Cc: 'Elecraft Reflector' Subject: RE: [Elecraft] KPA1500 Remote Program Hi Rick, Tnx

Re: [Elecraft] KPA1500 fan noise concern

...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of j...@kk9a.com Sent: Monday, May 28, 2018 9:14 PM To: 'Elecraft Reflector' Subject: [Elecraft] KPA1500 fan noise concern I imagine that due to the KPA1500's size it requires a higher volume of air than a large amplifier

Re: [Elecraft] KPA1500 Remote Program

Hi Rick, Tnx for the info. I will check that out to get me going till KPA1500 Remote is available. 73, N2TK, Tony From: rta...@gmail.com [mailto:rta...@gmail.com] On Behalf Of Rick Tavan Sent: Wednesday, May 30, 2018 1:58 AM To: N2TK, Tony Cc: Elecraft Reflector Subject: Re: [Elecraft

Re: [Elecraft] KPA1500 Remote Program

No idea when KPA1500 Remote will appear, Tony, but you don't need it to operate the amp remotely. KPA1500 Utility has a very nice Operate page that I have found quite adequate to operate my amp in the mountains from a control site in the valley. I use Chrome Remote Desktop to view and manipulate

Re: [Elecraft] KPA1500 fan noise concern

wrote: > > I imagine that due to the KPA1500's size it requires a higher volume of air > than a large amplifier would. Its small size and weight make it appealing. > The Acom 2000 has a control box that is separate from the amp so you really > never hear the amp run. I am wonderin

[Elecraft] KPA1500 fan noise concern

from the amp so you really never hear the amp run. I am wondering it something similar can be done with the Elecraft KPA1500, perhaps an option like the K-Pod, so that the noise source is further from the operating position? John KK9A

Re: [Elecraft] KPA1500 remote program

Hi Tony, We are working on it now and should have a beta version for customer testing in the next couple of weeks. 73, Eric elecraft.com _..._ > On May 29, 2018, at 2:21 PM, N2TK, Tony wrote: > > Any word on the Remote Program for the KPA1500? The KPA500 Remote Program > works fine and

[Elecraft] KPA1500 remote program

Any word on the Remote Program for the KPA1500? The KPA500 Remote Program works fine and allowed me to move the amp to the basement. I want to do likewise with the KPA1500. 73, N2TK, Tony __ Elecraft mailing list Home:

Re: [Elecraft] KPA1500 fan noise concern

. The Acom 2000 has a control box that is separate from the amp so you really never hear the amp run. I am wondering it something similar can be done with the Elecraft KPA1500, perhaps an option like the K-Pod, so that the noise source is further from the operating position? John KK9A Thanks

[Elecraft] KPA1500 fan noise concern

with the Elecraft KPA1500, perhaps an option like the K-Pod, so that the noise source is further from the operating position? John KK9A Thanks for the offer, Clay. But we actually did extensive thermal analysis of both the heat sink and fans, tested many different fan types and configurations

Re: [Elecraft] KPA1500 fan noise concern

Thanks for the offer, Clay. But we actually did extensive thermal analysis of both the heat sink and fans, tested many different fan types and configurations, and did comparative noise testing of the KPA1500 vs. a number of other amps. As you allude to, there’s no magic bullet. Heat must be

Re: [Elecraft] KPA1500 fan noise concern

I don't have a fancy schmancy degree in acoustic design, but in my 20+ years of thermal control design for computing and other electronic products, I necessarily dealt with acoustic design as it pertains to device chassis.  They are often competing demands. One of my main selling points to many

Re: [Elecraft] KPA1500 fan noise concern

My KPA1500 seems to max out at about 65 C when running and calling CQ.  At that temperature, the fans are just barely audible with the Radiosport headset.  That would be way too loud for me with any other headset I've used, let along a speaker.  While it has other big advantages, the noise

Re: [Elecraft] KPA1500 fan noise concern

Well, I manually set the fan to 2 when I’m going to use the amp heavily. It’s a bit noisy but acceptable to me. 73 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

Re: [Elecraft] KPA1500 fan noise concern

On 5/28/2018 11:24 AM, Ralph Parker wrote: I ordered the '1500 In the quest to be a couple of instant db louder, but if I don't hear some resolution of the noise 'problem', I'm going to put the order on hold until it is solved. I do have many headsets which I usually wear, including the Bose

[Elecraft] KPA1500 fan noise concern

I'm on the list for a '1500, expected sometime in August (maybe). However, I'm getting concerned about the reported high fan noise level. I currently have a '500, and following a suggestion a year or two ago, I've turned the fans around 'backwards' and they seem to be quieter in this

[Elecraft] KPA1500 Remote Program

Any word on the KPA1500 Remote Program? Once the program is available I can move the KPA1500 alongside my KPA500 on a shelf in the basement. 73, N2TK, Tony __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft

Re: [Elecraft] KPA1500, First Contest

Scott Are you also getting temp fluctuations in xmit and how much?  Mine is dependant on the temp, at lower temps the fluctuation is less than if up at 60Cand mine only happens on 40 mtrs.  Spoke with an Elecraft engineer and this could possibly result in a mod surrounding the temp sensor.

[Elecraft] KPA1500, First Contest

OK, just a CWT mini-test.  Max. temperature when running was 63 C, fan noise not an issue with Radiosport headset.  The flashing SWR lights, stopped in PTT mode.  Temperature jumping around when transmitting persists in PTT mode, but stable on receive.  Power gain seems to drift around a bit,

[Elecraft] KPA1500 Ethernet

th.net Subject: 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

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

Re: [Elecraft] KPA1500 fan noises

About- "Take care in the application of added cooling efforts" Yes, but the proof is in the pudding; watching LEDs display the amp's temp, the readings are always cooler with the aux fans running. One reason is that between transmissions they continue running and reset the temp back to near

[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 fan noises

"The benefit to putting fans in back blowing through the stock screen/fans is that you get the slight added benefit of over-pressuring the chassis which tends to keep the chassis interior cleaner. Assuming adequate rear spacing, you can hide the fans a bit more" Yes. and the ultimate is

Re: [Elecraft] kpa1500 new issue

Well, I just spoke with Elecraft and it appears this problem was one they had run across in early engineering.  I sent them the config file which might have some indicatorsthey can look at and make some determinations.  But if it turns out to be what the engineer said it might, there might be

Re: [Elecraft] KPA1500 fan speeds and fan noise

ky via Elecraft [elecraft@mailman.qth.net] Sent: Monday, May 21, 2018 8:01 AM To: Elecraft Reflector Subject: Re: [Elecraft] KPA1500 fan speeds and fan noise That doesn't move any air across the heat sink or solid state devices that need the air.  The air that comes out of those vents starts at th

Re: [Elecraft] KPA1500 fan speeds and fan noise

] on behalf of Bill Stravinsky via Elecraft [elecraft@mailman.qth.net] Sent: Monday, May 21, 2018 8:01 AM To: Elecraft Reflector Subject: Re: [Elecraft] KPA1500 fan speeds and fan noise That doesn't move any air across the heat sink or solid state devices that need the air. The air that comes out

[Elecraft] KPA1500, First Impressions

So far, all looks good.  My only concern is that the ATU doesn't always find a good match, even when the antenna is below 2:1. With the default "stop" threshold set to 1.2, it often stops at 1.6:1 or greater.  A second tuning sometime helps a bit. Increasing tune power to 20W didn't help much.

Re: [Elecraft] KPA1500 fan speeds and fan noise

> On May 21, 2018, at 1:56 PM, Bill Stravinsky via Elecraft > wrote: > > If you are going to depend on those 2 fans sucking hot air out of the amp > instead of using the internal fans that push it where it needs to go, I think > you arepulling hot air out of the amp

Re: [Elecraft] KPA1500 fan speeds and fan noise

If you are going to depend on those 2 fans sucking hot air out of the amp instead of using the internal fans that push it where it needs to go, I think you arepulling hot air out of the amp and that hot air has already done its damage. BillK3WJV On Monday, May 21, 2018, 3:29:29 PM EDT,

Re: [Elecraft] KPA1500 fan speeds and fan noise

Yes it does, normally air flow is from rear to top. The fans placed over the exhaust vent on top create a partial vacuum, drawing in air through the idle (or running) fans on the rear apron and out the top just like when the regular fans are doing that job. RoyK6XK "That doesn't move

Re: [Elecraft] KPA1500 fan speeds and fan noise

I have a KPA-1500  #171 and when I set the fans at 1 the air is being pulled from the back by only the middle fan on  the back. The air is exiting out the top cover, front, right.  This exit area is just a little over 5" x 8".  I feel a good deal of air coming out the top evenly distributed

[Elecraft] KPA1500 fan speeds and fan noise

>From the KPA500 kit build manual: "If airflow arrows are visible on the fan housing, they will show that air will be blown out of the back of the KPA500." It was a bit surprising to me that the KPA500 fan airflow is the opposite of natural convective flow but I accepted that was the intended

Re: [Elecraft] KPA1500 fan speeds and fan noise

That doesn't move any air across the heat sink or solid state devices that need the air.  The air that comes out of those vents starts at the fans in the rear. BillK3WJV On Monday, May 21, 2018, 6:07:22 AM EDT, Roy Koeppe wrote: All, My solution is two 4.5-inch,

Re: [Elecraft] KPA1500 fan speeds and fan noise

All, My solution is two 4.5-inch, 48-volt dc muffin fans sitting on half-inch tall rubber feet covering the top exhaust vent on amp. They are running on a 19-volt supply at a slow but effective cooling speed and are very quiet (drawing air upward). During normal CW rag chewing the main fans

[Elecraft] kpa1500 new issue

In the last few days I have made about 21 Qso's with the new amp casually and about 75 Q's in a few contests over the weekend.  The first night I had a problem that seemedto disappear.  It only happened on 40mtrs.  I was xmitting and the power dropped like I went into stby but no indications on

Re: [Elecraft] KPA1500 fan speed interrogation

Oops!  Ouch!!  I don't use the programming functions yet, but I would suggest perhaps farming out the updating of the Programmer's References for the K3, K3s, KPA500, and KPA1500 to an interested Elecraft user willing to stay right on top of the changes and produce change docs, or updated base

Re: [Elecraft] KPA1500 fan speed interrogation

I received an off list email explaining that ^FS is not included in The KPA1500 command set but may be added later. It seems the reason it was not included is that the KPA500 Programmer's reference was used as starting point for the KPA1500 command set. That document has not been kept up to

Re: [Elecraft] KPA1500 S/N 160 delivered today

vinsky via Elecraft" <elecraft@mailman.qth.net> To: "Elecraft Reflector" <elecraft@mailman.qth.net> Sent: 2018-05-18 15:41:49 Subject: Re: [Elecraft] KPA1500 S/N 160 delivered today >After having played with mine extensively last night, I was under the >impre

Re: [Elecraft] KPA1500 Delivery Time

t;elecraft@mailman.qth.net> Subject: Re: [Elecraft] KPA1500 Delivery Time KPA lead time for -new- orders was posted at 9 weeks on the shipping status page just last week, right before we left for Dayton. (A drop of 2 weeks from our prior estimate.) We’re shipping at a good clip and

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