[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] KPA-1500 Fan Noise

At 09:14 PM 6/2/2018, Eric Swartz - WA6HHQ, Elecraft wrote: There are no limitations to turning it on and off frequently. (Of course we recommend letting it cool first before turning it off temporarily when running higher duty TX cycles.) I would have thought the software would have kept the

[Elecraft] Elecraft CW Net Announcement

Good Evening,    Another cool, gray week.  No rain but the temperature barely rose above 60.  The sun had a little activity.  A few small spots which are now passing over the limb.  Flux is a little higher than during the winter but not much.  Daylight is lasting much longer, sunset today was

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 are

Re: [Elecraft] KPA-1500 Fan Noise

One quick note: We have shifted up the fan turn on temperatures by about 7 degrees for Fan speed 2 and above in our next KPA1500 s/w release and on newly shipping amps. The release should be available in the next week or two. As noted by others, setting the minimum RF deck fan speed to 1 (or

[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

[Elecraft] [FS] Pico Paddle SOLD

__ 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: ht

Re: [Elecraft] KPA-1500 Fan Noise - measured (sort of)

Those numbers are pretty impressive for quiet. Certainly quieter than a quiet dishwasher unless you really pushing it. Mike va3mw On Sat, Jun 2, 2018 at 11:09 PM, Bob McGraw K4TAX wrote: > Using a Sound Level Meter with A weighted scale, measure the noise at 1 > meter in at least 4 different

Re: [Elecraft] TX Sample level on KPA1500?

Jim I have done a little characterization of the TX Sample.  Testing I did was into a dummy load running CW and using the KPA1500 reported powers.  Ran K3s barefoot measuring the TX Sample level terminated with 50 ohms from 20 - 100W in 10W steps .  Then ran with KPA1500 operating up to about

Re: [Elecraft] KPA-1500 Fan Noise - measured (sort of)

Using a Sound Level Meter with A weighted scale, measure the noise at 1 meter in at least 4 different directions.   Preferably done in a "free field" such that any acoustic reflections are at least 6 meters distant.    I know it is difficult to make measurement outside on a piece of equipment s

Re: [Elecraft] TX Sample level on KPA1500?

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[Elecraft] [FS] KXPA100 with ATU and KXPACBL set

Built and tested but never used. Was going to install in vehicle but it didn't happen. Power cable is not original but I'm providing an equivalent. All manuals. Will be VERY well protected and shipped insured. $900 shipped CONUS. Contact me for pics or questions. N3IKQatYahoo ___

[Elecraft] 6M open from Indianapolis to the SE & SW

It has been pen solid for the pats hour. It is now 10:45PM EDT and in the past hour I have logged 74 different 6M FT8 transmitters ranging to the tip of FL and the Rio Grande. Michael Blake k9...@mac.com __

[Elecraft] [FS] QRP Works SideKar

Selling a QRP Works Sidekar with data cable. Mounts for KX2 included but easily adapted to KX3. Very little use. A few light scratches on clear bezel. . $195 shipped CONUS. Email for pics or questions. N3IKQatYahoo. Thanks! __ Elecraft m

[Elecraft] [FS] Palm Radio Pico Paddle Single

Selling a Palm Radio Pico Paddle Single. Mount for KX2, KX3 included. Very little use. $95 shipped CONUS. Email for pics or questions. N3IKQatYahoo. Thanks! __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft

Re: [Elecraft] Fan speed on meter?

Sorry, I forgot that I'm asking about the KPA1500. 73, Jim N7US From: Jim N7US Sent: Saturday, June 2, 2018 21:21 To: Elecraft Reflector (elecraft@mailman.qth.net) Subject: Fan speed on meter? Maybe I've overlooked it, but I don't see a meter display option that shows the current fan

[Elecraft] Fan speed on meter?

Maybe I've overlooked it, but I don't see a meter display option that shows the current fan speed. Is there one? 73, Jim N7US __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth

Re: [Elecraft] power connector part number

James, I can't believe that no one has replied to your question yet. The adapter is a "standard part".  They are a "Tensility 10-01065".  You should be able to find that on Google.  They are definitely available from DigiKey as part number 839-1167-ND. This is the part I use for the PowerPole

Re: [Elecraft] KPA Fan Noise

I think there is fan noise then there is other fan noise. I've built HP tube amps that required lots of air flow to live. See http://sadxa.org/n7ws.html for examples.  My thinking was that you could never have too much air.  That said, the blower noise was different in these from what my KPA50

Re: [Elecraft] KPA-1500 Fan Noise - measured (sort of)

Thanks Chris, I do not think I will buy the current configuration of the KPA-1500 fans.  I was seriously doing so..  I would still like to know the model number of the fans.  Mel, K6KBE From: "Chris Codella, W2PA" To: elecraft@mailman.qth.net Sent: Saturday, June 2, 2018 4:14 P

Re: [Elecraft] OT: 6M proceedure

I've been licensed long enough to remember when you kept a logbook to meet FCC requirements and you listed what you did on the air, even if it was just testing.  I lined out and initialed changes. I'm reminded of a guy on the FT8 Yahoo group who admitted that his computer and radio "worked" an

[Elecraft] KPA-1500 Fan Noise - measured (sort of)

In an attempt to quantify this, I installed OSHA's free NIOSH app, which measures noise, onto my iPhone 7 and tried it out. It's not a measurement instrument, mind you, so the absolute numbers are highly questionable. But the relative numbers are interesting. I held the phone at eye level be

Re: [Elecraft] OT: 6M proceedure

I don't consider it anal I consider it a matter of principle, and agree with Jim.  I'd do the same thing.  __ Clay Autery, KY5G (318) 518-1389 On 06/02/18 16:07, Wes Stewart wrote: Good grief, how anal can you get? On 6/2/2018 11:02 AM, Jim Brown wrote: ...And when I

[Elecraft] K2 audio howl

I recently acquired a built K2, serial 7237. Occasionally, when first turned on, it emitted a very loud medium pitched tone for a couple of seconds. Otherwise it seemed to operate normally. Now suddenly whenever it is turned on it emits this howl constantly, and no changes in settings affect th

Re: [Elecraft] KPA-1500 Fan Noise

It is NOT JUST a matter of of getting an HD15 M-->F extension cable (which can be had in lengths up to 100 feet. A VGA signal is analog and can be extended to up to 100 feet TOTAL according to the spec, all things being optimum. But one MUST look at the signals being sent between the KPA-1500

Re: [Elecraft] KPA1500 Fan Noise

Hello Ted, I haven't owned an airplane in years either, 1995 when I sold my BD-4, Darn. However, As I grow older and the ears get weaker, having to listen to fan noise mixed with SSB voice is a concern.  I am an engineer of sorts and know that there are ways to control the noise from fans.  E

Re: [Elecraft] OT: 6M proceedure

Interesting conversation.  As one those old farts, age 76 and a ham for 60 of them, I do still have all of my teeth, most of my hair and a 59-year-old fiancee. I guess I fail to understand the heartburn about calling frequencies. First, they aren't FCC assigned frequencies.  It is completely le

Re: [Elecraft] KPA500 and K3 SWR meters disagree

Have you replaced the coax cable between the KPA500 and the KAT500? Sent from my iPhone > On Jun 2, 2018, at 5:04 PM, jeff griffin wrote: > > Hi Jack. The swr is so different between the two that there has to be a > problem. I've had this setup for 3 years and never experienced this > behavi

[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. Don's video was very well done and a great help in understanding the realities. I know zero about thermod

Re: [Elecraft] OT: 6M proceedure

Good grief, how anal can you get? On 6/2/2018 11:02 AM, Jim Brown wrote: ...And when I work someone off the calling frequency and hear him later running on the calling frequency, I take the Q out of my log __ Elecraft mailing lis

Re: [Elecraft] KPA500 and K3 SWR meters disagree

Hi Jack. The swr is so different between the two that there has to be a problem. I've had this setup for 3 years and never experienced this behavior. 73 Jedff kb2m -Original Message- From: Jack Brindle [mailto:jackbrin...@me.com] Sent: Saturday, June 2, 2018 4:47 PM To: jeff griffin Cc:

Re: [Elecraft] KPA500 and K3 SWR meters disagree

Thanks for the reply Don. Tried that and didn't work, still have the SWR issue. Tried the amp on a resonant frequency, and it still is showing a bad SWR, but not bad enough to always fault. 73 Jeff kb2m -Original Message- From: Don Wilhelm [mailto:donw...@embarqmail.com] Sent: Saturday

Re: [Elecraft] Windows 10 Update Breaks COM Port for K3 & P3 Utilities

Don, I confirmed the correct com port is com3. Mark WU6R > On Jun 2, 2018, at 3:53 PM, Don Wilhelm wrote: > > Mark, > > Are you using the USB interface on the K3S, or a USB to serial adapter to > connect to the K3? > > If that is the case, did the assigned COM port get changed with the Win

Re: [Elecraft] Windows 10 Update Breaks COM Port for K3 & P3 Utilities

Don, I am using the USB cable that is USB to USB from my pc to the USB connection on the back corner of the K3. Mark > On Jun 2, 2018, at 3:53 PM, Don Wilhelm wrote: > > Mark, > > Are you using the USB interface on the K3S, or a USB to serial adapter to > connect to the K3? > > If that is

Re: [Elecraft] KPA500 and K3 SWR meters disagree

Jeff; Do I understand that for the first test you are driving the antenna through the KPA500 and KAT500 (with KAT500 in bypass)? If so, it makes a lot of sense that you will see different SWR. The KPA and KAT are providing a completely different load for the K3. The better test is to feed the a

Re: [Elecraft] OT: 6M proceedure

I traded a 75A2 for a new 6m Gooney III in 1960. I worked nothing but 6m for the next two years until I went in the Army in 1962. Spent many a night on SF's Twin Peaks with that radio. One of my happiest times in ham radio. I'm pretty sure 50.125 was calling frequency then too. The band was al

[Elecraft] Monitoring 6M For Openings

I do it several ways. First, the map, at dxmaps.com stays in my browser full time during E-skip season. If I'm in the shack, I monitor the FT8 frequency -- I've found it's a far better indicator than the calling frequency that something is happening (or not). Third, I monitor Ping Jockey, and o

Re: [Elecraft] Windows 10 Update Breaks COM Port for K3 & P3 Utilities

Mark, Are you using the USB interface on the K3S, or a USB to serial adapter to connect to the K3? If that is the case, did the assigned COM port get changed with the Windows 10 Update? Some have reported it has happened to them. To check the COM port that is assigned, open Device Manager

Re: [Elecraft] OT: 6M proceedure

Absolutely correct!  These old farts, gum beaters and false teeth clackers,  are usually running 100 watts or so to outside non-directional antennas and are often no more than 20 miles apart.   If challenged one will be told that "we were hear first and you should move on".   They do not recogn

Re: [Elecraft] OT: 6M proceedure

And the yellow 6 meter "Gooney box" borrowed from CD. Well still not wealthy but maybe I should upgrade and put together the Johnson 6N2 new in the box kit that rests in the basement. 73, Bob K2TK ex KN2TKR (1956) and K2TKR On 6/2/2018 3:10 PM, Fred Jensen wrote: Yep, that Heath Sixer was qu

[Elecraft] KPAK3AUX maximum length

I had asked Elecraft back in August when I ordered my 1500 about making a longer cable. This was the response back then: Thanks for the contact.  To your questions on the AUX cables, you can actually connect 2 of them in series without a problem.  This will give you about 6 feet of cabling.  We'

Re: [Elecraft] Boldly OT: 6 meter Sporadic-E season and the FT-8 microjuggernaut

Hi Lynn, True and a very nice map it is indeed. The issue I was trying to point out and not doing a very good job is that with gab or twitter the band opening data could be "pushed out" to subscribers in near real time, something needed for quick openings on 6m. Besides who doesn't own a sm

[Elecraft] KPA Fan Noise

I have been cooling amplifiers 1980. I built an 8877 amd it had a blower. I don't understand the fan noise problem. Tubes and Transistors need cooling. The more the better. Earphones are the answer if you can't hear the weak ones. Frankly I don't care about the weak ones. Probabliy can't hear the w

Re: [Elecraft] Windows 10 Update Breaks COM Port for K3 & P3 Utilities

What I meant was, can you use some other program besides K3 Utility, like Hyperterm, etc. (a simple terminal server) to communicate with the K3? An updated terminal utility may have been included with your new OS. Wayne > On Jun 2, 2018, at 12:10 PM, Mark Wheeler wrote: > > Wayne, > > No I c

Re: [Elecraft] KPA-1500 Fan Noise with added VGA comments

Not from Elecraft but... Yes the caution is warranted for "VGA" cables. They are not always pin for pin and can do two things wrong. One is that not all pins are wired and the other is worse as they sometimes tie the shields together shorting out needed pins. There are multiple versions of VG

Re: [Elecraft] OT: 6M proceedure

Yep, that Heath Sixer was quite a rig.  If you were wealthy, you could move up to a Johnson 6N2. [:-) 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 6/2/2018 10:01 AM, Mel Farrer via Elecraft wrote: I have been on 6M since 1956.  Ahhh those were the days. Mel, K6KBE

Re: [Elecraft] Windows 10 Update Breaks COM Port for K3 & P3 Utilities

Wayne, No I cannot. The command tester tab and terminal tab are grayed out. Mark WU6R Sent from my iPad > On May 30, 2018, at 11:40 PM, Wayne Burdick wrote: > > Can you communicate with the K3 using a simple terminal server? E.g., send > “FA;” and see if you get the VFO A frequency in respo

Re: [Elecraft] KPA-1500 Fan Noise

Yes John, and it turns out to be a fairly simple equation if you make a few assumptions.  Around 1958 or so and a student [sophomore], I spent the summer with a small crew building KPFK on Mt. Wilson in Los Angeles.  The TX was almost totally homebrew [REL serrasoid exciter], with 4 4-1000A's i

Re: [Elecraft] KPA-1500 Fan Noise

After I ordered my kpa1500 back in August I asked that same question to Elecraft.  My intent was to make my own AUX cable to put the amp where I wanted.The response was that the AUX BUS can only be so long and it was hinted that about 7 or 8 ft might be the most you should have.  Since one AUX

Re: [Elecraft] KPA-1500 Fan Noise

Les, Good advice to check with Elecraft. I believe there are 4 parallel wires for 12V+ and 4 parallel wires for 12V- in the cable. I think most if not all of the 15 pins are used. I believe there is a 12V, 3A supply in the PS box for the RF deck. 73, N2TK, Tony -Original Message- From: ele

Re: [Elecraft] OT: 6M proceedure

We have several fools around here in Tennessee that are often oblivious to openings on 50.125. The edge of an opening can be pretty sharp, and even 5-10 miles in the "wrong direction", they will never know it... and keep on yakking. for hours at a time. (honestly, they know better.

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 manua

Re: [Elecraft] Boldly OT: 6 meter Sporadic-E season and the FT-8 microjuggernaut

Hi Scott, Five times "yes" - one for each of the points you raise. I am a huge proponent of "if everybody's listening, nobody's going to make a QSO." I'm on the southern end of my fifties and I'm realizing now that although I really love Morse Code, I seriously doubt that I'll be able to be as pr

Re: [Elecraft] Boldly OT: 6 meter Sporadic-E season and the FT-8 microjuggernaut

Take a look at wsprnet.org. No twitter, nothing funky, just a map showing stations that are transmitting and who hears them. 73 -- Lynn On 6/2/2018 10:28 AM, Scott wrote: 3)  Now to beat up the computer geeks.  Someone could set up a twitter or gab account and advertise it to the ham communi

Re: [Elecraft] OT: 6M proceedure

Hi Ken, I strongly agree, and when I use the calling frequency, it's exactly as you describe. During contests, I refuse to work anyone who uses the calling frequency as an operating frequency, even at a different time during the contest when he's moved. And when I work someone off the calling

Re: [Elecraft] KPA-1500 Fan Noise

Les, A VGA extension will NOT do the job. Get a cable with all 15 pins connected straight through. 73, Don W3FPR On 6/2/2018 12:07 PM, Les Peters wrote: Jim I agree with your personal observations. I run some high duty cycle modes so I notice the fans kicking into speed 3 a lot when the P

Re: [Elecraft] KPA500 and K3 SWR meters disagree

Jeff, Check the coax between the KPA500 and the KAT500. Make certain the connectors are tight. Replace with a different coax if you have one. You can always do a check on the KPA500 wattmeter by connecting a dummy load to the KPA500 (no tuner). 73, Don W3FPR On 6/2/2018 11:48 AM, jeff gr

[Elecraft] KPA-1500 Fan Noise

I would ask someone from Elecraft to respond to the VGA extension cable question. It seems everywhere I read within Elecraft Documentation is that standard VGA cables should NOT be used. In regards to extensions, I do not know if they all work pin to pin, or that they are meant to just extend sta

Re: [Elecraft] Boldly OT: 6 meter Sporadic-E season and the FT-8 microjuggernaut

Wayne, I'll give answering your question a try. Hopefully I won't piss off everyone... and it won't be too long. 0). First, monitor beacons or participate in the RBN for band openings and then call CQ on open bands. Heck, call CQ on "closed" bands... one never knows. I suspect there are

Re: [Elecraft] OT: 6M proceedure

There are several "watering holes"  on 6M.  50.140, 50.250, etc.  Mainly local groups, but it does let you know when the band is active.  Of course the FM channels are a good source also.  I have been on 6M since 1956.  Ahhh those were the days.      Mel, K6KBE From: Rose To: Elecraft R

[Elecraft] OT: 6M proceedure

IMO … based on years of 6M operating. Use 50.125 as a calling frequency -only-. NEVER hold a QSO, however "short", on this frequency. Typically one would say "CQ, this is XXX, listening 50.125(+), if wanting SSB QSO's or 50.125(-) or so if wanting CW QSO's. After the initial CQ, I seldom even l

Re: [Elecraft] KPA-1500 Fan Noise - YouTube ?

George, there is nothing like Eimac Orange with a glass bottle. RF sunburn :-) Hey, transistors can run pretty hot too, although they should not melt the solder. Case temp can get to 150 deg C and junction temp to 225 deg C. Yes your finger will burn on the case. And yes, the life of many power de

Re: [Elecraft] KPA-1500 Fan Noise - YouTube ?

Ah, yes ... the desert. Land of rattlesnakes, hairy spiders, and horny toads. We got none of them in Alaska, absolutely no snakes of any flavor, only garden spiders, and only the goldminers are h***. Enough rain to never water the lawn. We got snow, too!! I lived on the edge of the Mojave i

Re: [Elecraft] KPA-1500 Fan Noise

Jim I agree with your personal observations. I run some high duty cycle modes so I notice the fans kicking into speed 3 a lot when the PA temp gets to 68-70 degrees. That setting does a good job of reducing the temp and keeping it from climbing past 73 degrees. I've changed my min fan speed t

[Elecraft] KPA500 and K3 SWR meters disagree

I recently brought my KPA/KAT500 north for the summer and hooked up to my trapped multiband fan dipole that I use here in NJ. I leave my K3 here for remote use and use the amp at my winter home in Florida to use with my Flex 6500 with a Steppir Vertical antenna without the KAT500 tuner. When I

Re: [Elecraft] KPA-1500 Fan Noise

I have a Lunar-LInk System 72 (432 mhz) Amplifier using a pair of 3cx800 (perfectly designed by K1FO SK), in a cubic package that may actually be smaller than the KPA1500 (of course the power supply is external, and the blower and T/R relays are attached to the back of the amp).  I had a choice

Re: [Elecraft] KPA1500 Fan Noise Video posted

Don, That was an excellent video and comparison. Thanks for taking the time to make it and post it. I’m only a few weeks away from shipment and really would like the kpa-1500 in my RF chain. I have a kpa-500 and it’s been an outstanding performer. If the noise ends up being an issue I may co

Re: [Elecraft] KPA1500 Fan Noise Video posted

Paul …. The PS noise is minimal from my point of view. The power supply fans do run continuously while the amp is switched on …. You can hear the PS fans at the beginning and end of the video when the fan speed is set at “0” .. all you’re hearing at that time is the PS fan … at power down right

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: https://vimeo.com/273064

Re: [Elecraft] K3 KIO3 Board

I upgraded to the new board recently. The swap was easy, and works great. 73, W4KX Sent from my iPad > On Jun 2, 2018, at 8:24 AM, Peter B wrote: > > Hi Jorge, > I upgrade my K3 next week with the new board. > I let you know when Iam finished. > See what i will do with the old board. > > 73s

Re: [Elecraft] DVR equalization

Except that when I go to the Data mode the bottom 200 Hz of the receive audio spectrum is heavily rolled off and can not be restored with the Shift/Low cut adjustments. Michael Blake k9...@mac.com > On Jun 2, 2018, at 8:04 AM, Michael Blake wrote: > > It appear

Re: [Elecraft] KPA-1500 Fan Noise - YouTube ?

While running stations on 160m at a high rate, the finals of an Omni VI got so hot that output dropped to zero. Once the finals cooled for maybe about five minutes, full output returned. We then put a small fan on the heat sink fins and experienced no further problem. No damage at all to the

Re: [Elecraft] Amplifier Fan Noise

Peter,   Ah yes on AM with a squirrel cage blower to cool the pair of tubes     73 DOUG EI2CN    Sent from my Samsung Galaxy smartphone. Original message From: Peter Alterman Date: 02/06/2018 12:08 (GMT+01:00) To: Elecraft@mailman.qth.net Subject: [Elecraft] Amplifier Fan No

Re: [Elecraft] K3 KIO3 Board

Hi Jorge, I upgrade my K3 next week with the new board. I let you know when Iam finished. See what i will do with the old board. 73s, Peter/PD1RP Op do 24 mei 2018 om 23:51 schreef Jorge Mejia P > Anyone with a KIO3 board for a K3 , maybe left from having upgraded to the > newer boards. > I wou

Re: [Elecraft] KPA-1500 Fan Noise

I don’t have a dog in this fight - someone who spends half the year (the half with all the good contests) in a Florida condo is not a candidate for buying amps. But might water cooling be a possibility? As in a heat sink that sits in water, with appropriate thermal shutoff if the water/amp get t

Re: [Elecraft] KPA-1500 Fan Noise - YouTube ?

One other thought to keep in mind - solid state amps need a lower delta T than tube amps. Tubes like to run hot - solid state devices not so much. I've seen a tube with the fins so hot that the solder was in globs, while the transmitter was still operating. I doubt any solid state final would h

[Elecraft] DVR equalization

It appears that when recording off the air that the K3s’s receive EQ is ahead of the DVR’s input and when playing the recording back the transmit EQ settings are also applied to the output of the DVR before being fed into the SSB modulator. Is it correct that the radio’s EQ settings affect both

Re: [Elecraft] KPA-1500 Fan Noise - YouTube ?

Wes, tnx for the chuckle. No lawn mower, no umbrella, no place to store unwanted and unnecessary junk. You are livin' a dream. And you can string your dipoles from the Saguaro. Hey, if the arms are the correct lengths you can string some verticals to cover multiple bands. And if the arms are the

Re: [Elecraft] KPA1500 Fan Noise Video posted

There had been some talk about adding a pair of slow running fans on top of the amp over the vent holes to help suck out the air. Any comparisons done if the main fans run at a lower speed? N2TK, Tony -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mai

[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 sig

[Elecraft] Amplifier Fan Noise

I have found noise-canceling headphones to be an effective antidote to amplifier fan noise. But I must say that I like hearing that fan humming along and delivering the RF (though not hour after hour in a contest). Probably the result of a misspent youth beside a homebrew dual 813 linear rack.

Re: [Elecraft] Boldly OT: 6 meter Sporadic-E season and the FT-8 microjuggernaut

I really ought not step into this discussion. Obviously the Elecraft Reflector is a mainstay of CW ops. I've been using digital modes one eme since 2003. Back then the introductory program was JT44 which was supplanted by JT65 within a couple years. Then many variants were done to address c

Re: [Elecraft] KPA-1500 Fan Noise

Bill Schmidt is right--you have to get rid of a bunch of heat--no matter what device you are using to amplify (tubes, transistors, or magic). The amplifying device must dissipate considerable heat because we are running Class AB and because of all electronic devices are naturally lossy. Rememb

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 In res