[Elecraft] KPA-500 Failure

Hello Rick (NK7I) and Andy (K3WYC) - Tnx replies "Message: 17 Date: Wed, 24 Apr 2024 14:11:28 + From: Andy Durbin To: "elecraft@mailman.qth.net" Subject: [Elecraft] KPA-500 Failure Message-ID: < dm4pr10mb6791e0db00b79830385f5cd28c...@dm4pr10mb6791.namprd1

[Elecraft] KPA-500 Failure

"With the OPER light GREEN and slowly increasing the RF drive level to the amp, there is a point where an internal relay 'click' can be heard, the 50-watt LED on the top row of LEDs turns red and the FAULT light turns red." All the KPA500 LED are single color. The 50 W LED is either lit green o

Re: [Elecraft] KPA-500 Failure

It sounds like blown FETs.  It may be time to ship it to CA where any/all upgrades can be done as well as repair. They're a little backed up, so it may take a few weeks.  Parts and shop time too of course. Call the techs to discuss it and get an RSA and ask if they want you to pull the trans

[Elecraft] KPA-500 Failure

Greeting to everyone I have read the KPA500 operator manual in hopes of solving my issue and have found nothing that solves/fixes the problem. This amplifier has been a workhorse for many years and today after the KAT500 antenna tuner searched/found a 'match' for a new antenna, I selected OPER on

[Elecraft] KPA 500/KAT 500 Seemingly on the Fritz

Dear everyone, This morning while I was running a CW net, using a VibroPlex Lightning bug, my KPA 500 seemingly went on the Fritz. I was running it at 300 Watts, on 7.123 MHz, paired with my K3 using the smart cables, and it was working perfectly until about 10 minutes into the net. Whereupon it

Re: [Elecraft] KPA 500 Question

Also, many people forget that the KAT500 works on RX as well as TX and provides a band-pass filter which changes position across tuning segments. If you’re using the KAT500 without the Aux cable and the main TX antenna for RX, as soon as you tune the RX away from the current tuned segment, the RX

Re: [Elecraft] KPA 500 Question

I have a KPA-1500, and followed the manual's instruction to run an Aux cable between my K-3's ACC jack (on the KIO3B) and the KPA-1500.  I prefer to have the band changing already accomplished before I go key down, even for just a dit. 73, Pete N4ZR On 11/13/2023 7:14 PM, Jim Brown wrote: I

Re: [Elecraft] KPA 500 Question

I have cables that control the amplifier for each radio. By default, the KPA500, KPA1500, and KAT500 all have near-instantaneous frequency-detection. They switch very quickly to the right band, and the tuners will recall previous antenna tunings for the detected frequency. All it takes is a d

Re: [Elecraft] KPA 500 Question

Doug, You will have to use a switch that changes all 15 conductors.  VGA switches may not implement all conductors and worse yet, some may be connected together to common (ground). 73, Don W3FPR On 11/13/2023 3:18 PM, Doug Millar via Elecraft wrote:  I am trying to use my K3 and a Yaesu FT

[Elecraft] KPA 500 Question

 I am trying to use my K3 and a Yaesu FTDX10 with my KPA 500. I have cables that control the amplifier for each radio. What can I use for a switch box to switch the cables into the amp? A VGA switch did not work.   Doug K6JEY __ Elecraft

Re: [Elecraft] KPA 500 Erratic Band Changes

Dave; Do you get the Operate message on the K3 display before the band change? Might the K3 be transmitting when you hit the OPER button on the KPA? Use the KPA Utility to get a fast log file and send it my way. I am very interested in seeing the KPA’s current settings. I’m really puzzled at wh

[Elecraft] KPA 500 Erratic Band Changes

K3 – KAT500 – KPA500 setup using AUX cables (2) to interconnect. All 3 devices seem to be talking to each other just fine but when I go from STBY to OPER on the amp, it changes bands and changes the band on the K3. It most often goes to 28Mhz but not every time. I checked both cables for continu

Re: [Elecraft] KPA 500: No Output

...@mailman.qth.net] On Behalf Of dave ingebright Sent: Tuesday, December 13, 2022 9:47 AM To: elecraft@mailman.qth.net Subject: [Elecraft] KPA 500: No Output Hello-- I have a 3 yr old KPA500 that has just exhibited it's first problem. No amplification! I am remote controlling it via the r

Re: [Elecraft] KPA 500: No Output

If you have a camera pointing at the amp, look for the "*" when you key down... 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist, RFI ARRL Asst. Director, NW Division, Technical Resources On 12/13/22 07:47, dave ingebright wrote: Hello-- I have

[Elecraft] KPA 500: No Output

Hello-- I have a 3 yr old KPA500 that has just exhibited it's first problem. No amplification! I am remote controlling it via the remote client over the internet from 2000 miles away. Nothing has changed in the remote shack and no wiring has been disturbed. There is no output from the KPA on any

Re: [Elecraft] KPA-500 timing settings IC-7300

craft@mailman.qth.net Subject: Re: [Elecraft] KPA-500 timing settings IC-7300 On 7/27/2022 12:08 PM, Lyn Norstad wrote: > CW Rise Time set to the default, 4ms (range 2ms - 8ms). This is MUCH too fast, very clicky. Even the slowest is much too clicky. See my analysis of ARRL Lab Test results

Re: [Elecraft] KPA-500 timing settings IC-7300

3 Lyn, WØLEN -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Thursday, July 28, 2022 2:55 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA-500 timing settings IC-7300 On 7/27/2022 12:08 PM, Lyn No

Re: [Elecraft] KPA-500 timing settings IC-7300

On 7/27/2022 12:08 PM, Lyn Norstad wrote: CW Rise Time set to the default, 4ms (range 2ms - 8ms). This is MUCH too fast, very clicky. Even the slowest is much too clicky. See my analysis of ARRL Lab Test results done in 2014. This is all THEIR data, that they sent me in electronic form. ht

Re: [Elecraft] KPA-500 timing settings IC-7300

-boun...@mailman.qth.net] On Behalf Of Tom N4LSJ > Sent: Tuesday, July 26, 2022 8:39 PM > To: Elecraft@mailman.qth.net > Subject: [Elecraft] KPA-500 timing settings IC-7300 > > I've been on the internet and can find IC-7300 TX Delay, CW Rise Time > settings for other amplifiers p

Re: [Elecraft] KPA-500 timing settings IC-7300

- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Tom N4LSJ Sent: Tuesday, July 26, 2022 8:39 PM To: Elecraft@mailman.qth.net Subject: [Elecraft] KPA-500 timing settings IC-7300 I've been on the internet and can find IC-7300 TX Delay, CW Rise

Re: [Elecraft] KPA-500 timing settings IC-7300

t5he ic7300 does have an RF tail, which has recently been discussed in the ic7300 group on groups.io extract from there: Hello Adam, As you requested, I have updated the page with the new 'scope trace. http://wb6bbb.com/Icom_IC-7300/index.html The entire web

Re: [Elecraft] KPA-500 timing settings IC-7300

The KPA500 is a QSK amplifier. It switches from RX to TX very rapidly (about 2 mSec) in order to allow QSK operation of the station. The TRTime parameter sets the time the KPA takes to transition from TX to RX - this is specifically for transmitters that may continue to output RF for a short ti

[Elecraft] KPA-500 timing settings IC-7300

I've been on the internet and can find IC-7300 TX Delay, CW Rise Time settings for other amplifiers pretty easily.  There don't appear to be any for -specifically- the IC-7300 and KPA-500.  Are there "officially sanctioned" settings for that combination?  I feel it may be overkill to use 30ms w

Re: [Elecraft] KPA-500 Line-Voltage Issues

I had to add a soft-start relay to my Astron RS-70A power supply to keep it from popping a 16a breaker when using it on 50 Hz. But otherwise it works fine with the transformer wired for 240v. 73, Victor, 4X6GP Rehovot, Israel Formerly K2VCO CWops no. 5 http://www.qsl.net/k2vco/ On 07-Jul-202

Re: [Elecraft] KPA-500 Line-Voltage Issues

and, though not always well known, ferrite cores in transformers for feeding antennas can also saturate with excess RF power.  The resulting RF din can be discouraging to neighbor hams and folks watching TV. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County Josh Fiden wrote on 7/6/2022 3

Re: [Elecraft] KPA-500 Line-Voltage Issues

Transformer core can saturate if line frequency is too low. Except I’d be certain KPA-500 uses the same transformer for export to 50Hz countries so your variations are fine. Many years ago when I was young & dumb discovered this the hard way. Customers would take products with 120v/60Hz line x

[Elecraft] KPA-500 Line-Voltage Issues

Greetings everyone I hesitate to use my KPA-500 here at this CN98pi QTH. LIne frequency here varies daily between 58.xx-to-61.yy Hz and line voltages vary between 110-to-130VAC due to the limitations of the governor controlling the communities 200KW hydro system (Chelan County PUD remote facility)

Re: [Elecraft] KPA 500

With all the various pieces of information in this discussion, let’s answer things correctly. First, is hardwired cabling needed? The answer is no, it is definitely not. The KPA500 always counts the RF frequency and will switch to the counted band if it does not agree with whatever else it sees.

Re: [Elecraft] KPA 500

s > I've had KPA500s and a KPA1500 I have yet to touch them. To each his own. > > Ken K6MR > > > From: elecraft-boun...@mailman.qth.net on > behalf of Andy Durbin > Sent: Wednesday, March 23, 2022 1:18 PM > To: elecraft@mailman.qth.ne

Re: [Elecraft] KPA 500

esday, March 23, 2022 4:26 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA 500 Hmm. I used to joke that I bought a KPA500 just so I could switch bands on my K3 without accidentally changing the VOX setting. N7WS On 3/23/2022 1:58 PM, Ken K6MR wrote: > "They are a "bandai

Re: [Elecraft] KPA 500

Hmm.  I used to joke that I bought a KPA500 just so I could switch bands on my K3 without accidentally changing the VOX setting. N7WS On 3/23/2022 1:58 PM, Ken K6MR wrote: "They are a "bandaid" for the lack of band buttons on the K3." I've always considered "band buttons" on any radio to be

Re: [Elecraft] KPA 500

ave yet to touch them. To each his own. Ken K6MR From: elecraft-boun...@mailman.qth.net on behalf of Andy Durbin Sent: Wednesday, March 23, 2022 1:18 PM To: elecraft@mailman.qth.net Subject: [Elecraft] KPA 500 "It’s also worth mentioning that if the radio and the amp are hard

[Elecraft] KPA 500

"It’s also worth mentioning that if the radio and the amp are hard wired together, changing the band using the buttons on the front of the amp automatically changes the band on the radio." It should be possible to disable the KPA 500 band buttons but it isn't. They are a "bandaid" for the lack

Re: [Elecraft] KPA 500

It’s also worth mentioning that if the radio and the amp are hard wired together, changing the band using the buttons on the front of the amp automatically changes the band on the radio. Richard W4KBX > With the band switching cable between the radio and amp, the amp follows the > receiver fr

[Elecraft] KPA 500

KPA500.   Sure is a sweet and reliable system.  Hard to screw up anything. 73 Bob, K4TAX On 3/23/2022 2:14 PM, elecraft-requ...@mailman.qth.net wrote: Message: 6 Date: Tue, 22 Mar 2022 10:24:59 +0100 From: F5vjc To: Elecraft Reflector Subject: [Elecraft] KPA 500 Message-ID: Content

Re: [Elecraft] KPA 500

Although I have a K3 and a K3S, they are relegated to backup service to my Kenwood TS-890. A number of us Kenwood users also have KPA500 and KAT500s.  We are using mostly home-built cables for interconnection.  If you don't have the KAT500 then RF sensing is probably good enough.  The advantag

Re: [Elecraft] KPA 500

A long time ago I used a KPA500 with a Yaesu FT1000MP and the RF sensing worked perfectly. Perhaps if you have a KAT500 and are using different antenna ports or have very out of tune antennas there may be an advantage to having cable control but otherwise I would not worry about it. John KK9A F

Re: [Elecraft] KPA 500

On 3/22/2022 2:24 AM, F5vjc wrote: What is the advantage of using a band switching cable between the transceiver and the KPA500 over just relying on the RF sensing function? I've never used one. A tap on the mic or a dit is all that is needed. 73, Jim K9YC _

Re: [Elecraft] KPA 500

On 2022-03-22 02:24, F5vjc wrote: What is the advantage of using a band switching cable between the transceiver and the KPA500 over just relying on the RF sensing function? Do you trust that RF sensing function? REALLY trust it? Because if you transmit into the wrong LPF, it can be Game O

[Elecraft] KPA 500

What is the advantage of using a band switching cable between the transceiver and the KPA500 over just relying on the RF sensing function? I want to drive my KPA500 from an FTDX 101D, is a cable the better way to go? 73 F5VJC __ Elecraft

[Elecraft] KPA 500

The unit was sold. AD2F John __ 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

[Elecraft] KPA 500

Unit was 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 thi

Re: [Elecraft] KPA 500 for Sale

Do you have a price in mind? On Tue, Oct 19, 2021, 16:47 John Pierce via Elecraft < elecraft@mailman.qth.net> wrote: > Excellent Condition, light usage. > > > > AD2F > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/l

[Elecraft] KPA 500 for Sale

Excellent Condition, light usage. AD2F __ 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.n

[Elecraft] KPA 500 for Sale

I have my KPA500 for sale. My location is NJ John, AD2F __ 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

[Elecraft] KPA-500 for sale, excellent condition

Local buyer (SETX) preferred: https://ae5x.blogspot.com/2021/09/elecraft-kpa-500-for-sale-local-buyer.html 73, John AE5X __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net

Re: [Elecraft] KPA-500 270V ERR

Well, at the risk of offending Fred ... A PIN diode has an intrinsic (I) region between the P and N junctions.  The I region is almost completely undoped and therefore the carrier lifetimes are long relative to the frequency of the signal being switched.  A PIN diode is turned on with CURRENT

Re: [Elecraft] KPA-500 270V ERR

On 2021-08-26 15:19, David Gilbert wrote: Pedantic? If those were truly PIN diodes like you called them the 270v bias wouldn't have been used there. Actually, I'm finding this interesting. So with real PIN diodes, you don't have to strongly bias them off? The HV is obtained in various way

Re: [Elecraft] KPA-500 270V ERR

Pedantic?  If those were truly PIN diodes like you called them the 270v bias wouldn't have been used there. Dave   AB7E On 8/26/2021 2:56 PM, Fred Jensen wrote: This morphed into a pedantic discussion of solid state diodes.  Chuck's original question was about the 270 V error.  I'm fairly s

Re: [Elecraft] KPA-500 270V ERR

This morphed into a pedantic discussion of solid state diodes.  Chuck's original question was about the 270 V error.  I'm fairly sure the only purpose for the 270 V in a KPA500 is bias for the T-R switch.  He asked for suggestions.  The T-R switch and the source for the 270 V might be a good pl

Re: [Elecraft] KPA-500 270V ERR

High voltage rectifier diodes would have very low doped N-regions, which means fairly long carrier lifetimes so no doubt they work somewhat like a PIN diode if properly biased.  But they aren't really the same thing, and I still say that a PIN diode has performance advantages in many situatio

Re: [Elecraft] KPA-500 270V ERR

Using 1N4007's and 1N5208's ( I could have the last # wrong ) as "Poor Man PIN diodes" is pretty established practice in the amateur community. Look up W6JL on QRZ.com. He has an extensive article about it on his page there. Also Hans Summers of qrp-labs uses them in his 50W QSK amplifier.

Re: [Elecraft] KPA-500 270V ERR

My schematic shows TR Switch diode type is S1M. Datasheet easily found on-line. I doubt this has any influence of 270 V failure. Andy, k3wyc __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://m

Re: [Elecraft] KPA-500 270V ERR

That sounds odd to me.  True PIN diodes are current actuated devices.  The carrier lifetimes are long enough that the devices are "on" even if the signal peaks exceed the voltage of the control current ... as long, of course, as the control current exceeds the signal current. On the other ha

Re: [Elecraft] KPA-500 270V ERR

I think the 270 V circuit is DC bias for the PIN diodes in the TR-switch. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 8/26/2021 10:32 AM, Chuck Chandler wrote: My KPA-500 has been running great for several years. Recently I noticed it was making the occasional extra "click" or "

[Elecraft] KPA-500 270V ERR

Well if it were mine I'd check the voltage on the nominal 270 V connector on the PA module then work back from there. I keep notes from discussion of other peoples problems and their resolution. You can find all this in the archive but this is what I have in my notes for KPA 270 V problems:

[Elecraft] KPA-500 270V ERR

My KPA-500 has been running great for several years. Recently I noticed it was making the occasional extra "click" or "thunk" upon powering up or down. Usually it would "click" when powered up and again when powered down, but recently a few seconds after the first click there would be another one

[Elecraft] KPA-500 Warm

See page 14, paragraph 1. for the confirmation of why the left rear corner is warm. 73 Bob, K4TAX On 6/30/2021 7:12 PM, elecraft-requ...@mailman.qth.net wrote: Message: 2 Date: Wed, 30 Jun 2021 09:08:41 -0700 From: Phil Hystad To: Ken Winterling Cc: Elecraft Reflector Subject: Re: [Elecraft]

[Elecraft] KPA 500

Hello. During operation with a high SWR and low power I heard a strong bang and the KPA500 shut off. I have opened the upper panel and found 2 ceramic caps of VRF2933. The inner side of the plastic cover is blackened Looks that the power supply is working I read 74.6 volt on the voltage display

[Elecraft] KPA-500 and KAT-500 For Sale

For Sale: KPA-500-K serial #29XX in excellent condition.original owner and non-smoking home.Amp is in good working condition. No scratches, scuffs or other cosmetic flaws.$1695 plus shipping and insurance. Also For Sale: KAT-500-F antenna tuner serial #19XX.In excellent condition cosmetically an

[Elecraft] KPA 500

I recently say a listing for a used KPA500. I managed to lose the info. If it's still availably could you please let me have the info. I'm very interested. Pete Block W2MGE pete_bl...@comcast.net Thanks. _

Re: [Elecraft] KPA 500 Codan Envoy

ing List Subject: Re: [Elecraft] KPA 500 Codan Envoy That is not a Ham radio. Is it legal to use an amplifier type accepted for Ham radio for other services? 73, Mark W7MLG On Mon, Jun 29, 2020 at 6:49 AM Bob Morgan wrote: I would like to know if any in the group has used the KPA 500 with a Codan Env

Re: [Elecraft] KPA 500 Codan Envoy

dio not designated for HAM use.obviously, NOT the case. 73, Charlie k3ICH -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Lyn Norstad Sent: Monday, June 29, 2020 10:47 AM To: 'Mark Goldberg' ; 'Bob Morgan' Cc: 'Elecraft Mailing List' Sub

Re: [Elecraft] KPA 500 Codan Envoy

t; From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mark Goldberg > Sent: Monday, June 29, 2020 9:09 AM > To: Bob Morgan > Cc: Elecraft Mailing List > Subject: Re: [Elecraft] KPA 500 Codan Envoy > > That is not a Ham radio. Is it legal

Re: [Elecraft] KPA 500 Codan Envoy

AM To: Bob Morgan Cc: Elecraft Mailing List Subject: Re: [Elecraft] KPA 500 Codan Envoy That is not a Ham radio. Is it legal to use an amplifier type accepted for Ham radio for other services? 73, Mark W7MLG On Mon, Jun 29, 2020 at 6:49 AM Bob Morgan wrote: > > I would like to know if any

Re: [Elecraft] KPA 500 Codan Envoy

That is not a Ham radio. Is it legal to use an amplifier type accepted for Ham radio for other services? 73, Mark W7MLG On Mon, Jun 29, 2020 at 6:49 AM Bob Morgan wrote: > > I would like to know if any in the group has used the KPA 500 with a Codan > Envoy 2. Any help would be much appreciated

[Elecraft] KPA 500 Codan Envoy

I would like to know if any in the group has used the KPA 500 with a Codan Envoy 2. Any help would be much appreciated. Bob Morgan KJ4SV 865 207 9568 -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: htt

Re: [Elecraft] KPA-500 clicking as the temperature changes

I have KPA500 SN 00149. Mine is a kit and it hasn’t had a lid off since I finished building it July 2, 2011, almost 9 years ago,. Like the rest, I heard clicking for a while and all of a sudden it stopped or I just no longer hear it. I think it stopped. Whatever was clicking found its happy

Re: [Elecraft] KPA-500 clicking as the temperature changes

I think it’s the “Z” bracket inside. Sent from my iPhone ...nr4c. bill > On Jun 25, 2020, at 10:12 AM, Howard Sherer wrote: > > I have had a KPA500 for many years and the only annoying thing is that I > hear clicking of the metal case parts as it heats up and cools down. all of > the case sc

[Elecraft] KPA-500 clicking as the temperature changes

I have had a KPA500 for many years and the only annoying thing is that I hear clicking of the metal case parts as it heats up and cools down. all of the case screws are tight and I had this problem from the early days even before I had to remove the RF deck and send it to the factory for minor repa

Re: [Elecraft] KPA-500 Fault - follow up

You will need the KAT500 Utility to perform a reset to factory values.   That software is a free download on the Elecraft site. While you are at it, download all the various software's for each piece of equipment.  i.e.  K3, P3, KPA500, KAT500.  They allow you to save parameters, change parame

[Elecraft] KPA-500 Fault - follow up

All, I tried to firmly seat all of the connectors. No change. I finally pulled them out and only used the keying cable (RCA to RCA). No change. One thing I noticed is that the KAT 500 was giving me Power and SWR reading, but no amplification from the amplifier. And if I had any more than 1

[Elecraft] KPA 500 6meter power out.

I have had this problem for some time but as I almost never use 6 meters it has not really concerned me. I have two identical K Line stations, K3's, KAT 500's, KPA 500's and P3's. On station #1 everything works as it should and if I put 25 watts into the KPA 500 I get 500+ watts out. On station #

Re: [Elecraft] KPA-500 Issues

What is the SWR? If above the KAT500 set value it inhibits the amp from being keyed. Check the KAT500 using the ATU utility. Bob, K4TAX Sent from my iPhone > On May 15, 2020, at 1:50 PM, Jack Brindle via Elecraft > wrote: > >  > Check the cable connections, including making sure that no

Re: [Elecraft] KPA-500 Issues

Check the cable connections, including making sure that none of the pins are bent in the AuxIO connectors in both cables (K3S - KAT500, KAT500 - KPA500). Also, make sure that the PTT line is actually being asserted. The asterisk is displayed when the Key In is asserted. If it isn’t displayed tha

Re: [Elecraft] KPA-500 Issues

That implies that the AUX cable is not working.  Cycle the gear power and make sure each connector is properly seated. Rick NK7I On 5/15/2020 11:07 AM, Edward via Elecraft wrote: I have the combo K3S/KAT500/KPA500 with all of the optional interconnection cables. I am not able to key the amp

[Elecraft] KPA-500 Issues

I have the combo K3S/KAT500/KPA500 with all of the optional interconnection cables. I am not able to key the amp though it was working earlier. The asterisk does not appear in the display. I went through the menu and everything is set accordingly. The inhibit is disabled. Any help would be

[Elecraft] KPA-500 and KAT-500 Wanted

Looking for KPA-500 and KAT-500. Does not need to be a package deal. Contact me at jimlc...@gmail.com . 73, Jim W2SM __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http:

Re: [Elecraft] KPA 500 fault!

Thanks! I found the earlier manual online, and am back operational! Thanks! Tom W4KX > On May 3, 2020, at 4:14 PM, iain macdonnell - N6ML wrote: > > On my early model, the interlock switch is actuated by an assembly > including a 13mm 4-40 standoff (and some other hardware), which is > attache

Re: [Elecraft] KPA 500 fault!

Ian, Could you also send me a copy, I have an older amp as well. 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources On 5/3/20 1:14 PM, iain macdonnell - N6ML wrote: On my early model, the inter

Re: [Elecraft] KPA 500 fault!

On my early model, the interlock switch is actuated by an assembly including a 13mm 4-40 standoff (and some other hardware), which is attached to the inside of the top cover. I'll attempt to send you the old (rev C) assembly manual off-list. 73, ~iain / N6ML On Sun, May 3, 2020 at 1:07 PM T

Re: [Elecraft] KPA 500 fault!

Problem is definitely the interlock switch not being engaged correctly: if I close it manually (with a wooden rod!) the amp operates normally. Anyone have an assembly manual for the older type KPA500, so I can see how the top-panel interlock switch is supposed to be engaged? Again, this a fairl

Re: [Elecraft] KPA 500 fault!

Hi Jack! After cycling the main power the HV in standby is back to 70 V. But, every time I go to operate mode, the error reoccurs. This is with what I believe was the old style interlock switch (has a shaft attached to the top cover to engage the switch when the top is screwed down). Can’t te

Re: [Elecraft] KPA 500 fault!

A “270V ERR” fault indicates that the TR switch bias supply is not working. This may be caused by the top cover being removed, the safety switch attached to the top cover becoming loose or an actual failure of the 270V supply. Since your main HV supply is now down close to 0V, it looks like you

[Elecraft] KPA 500 fault!

My KPA500 has been working fine waited for 115 V. Just now it has been throwing a “25=70 VAC” fault! Can anyone lead me in helping this? Fuses look good. HV read 0.1 v when in standby, which is FAR from the 70 some volts it used to read. Thanks! Tom W4KX __

Re: [Elecraft] KPA 500

"60 deg C with fan not running is not normal.  60 deg C is the nominal temperature for start of fan speed 3." The conversation was continued off "list" but there are a few points that I'd like to be in the archive -  There would appear to be two possible failure conditions.  Either the fan is

Re: [Elecraft] KPA 500

lman.qth.net] On Behalf Of Jim Brown > Sent: Friday, April 10, 2020 11:27 AM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] KPA 500 > > On 4/10/2020 8:45 AM, Irwin Darack wrote: > > In my experience, coax connectors, barrel connectors, etc. are always > > fail p

Re: [Elecraft] KPA 500

1:27 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA 500 On 4/10/2020 8:45 AM, Irwin Darack wrote: > In my experience, coax connectors, barrel connectors, etc. are always > fail points when there is a sudden increase in SWR as power is > increased. They oxidize over time and s

Re: [Elecraft] KPA 500

k To: elecraft Sent: Fri, Apr 10, 2020 1:23 pm Subject: Re: [Elecraft] KPA 500 A vendor at Dayton told me *all* are made in China, even the ones marked Amphenol. k4ia, Buck K3s# 11497 Honor Roll  8B DXCC EasyWayHamBooks.com On 4/10/2020 12:43 PM, Irwin Darack wrote: > Agreed. Many people

[Elecraft] KPA 500

"After transmitting at 200W the temperature slowly rises above 60 degrees C, but the fan doesn't cut in. Does anyone know if this is normal behavior and what temperatures I should expect to see?" Nominal temperature for start of fan speed 1 is 50 deg C although my data for one test run showed s

Re: [Elecraft] KPA 500

That’s likely true. But if he’s saying they’re the same as Chinese brand, that’s nonsense. I use a lot of connectors from Amphenol Audio which are made in China. The difference between Amphenol & equivalent Chinese is obvious on inspection. Mating is very solid and contact plating looks much n

Re: [Elecraft] KPA 500

Lyn, WØLEN -Original Message- From: Lyn Norstad [mailto:l...@lnainc.com] Sent: Friday, April 10, 2020 8:59 AM To: 'Alan - G4GNX'; 'Elecraft Reflector' Subject: RE: [Elecraft] KPA 500 At 100w on 20m, my KAT500 Utility shows an SWR of 1.00 with the KPA500 on Standby and temp

Re: [Elecraft] KPA 500

On 4/10/2020 10:19 AM, Buck wrote: A vendor at Dayton told me *all* are made in China, even the ones marked Amphenol. Um, Apple products have long been made in China. Fair-Rite has had one or more factories in China for more than a decade. "Made in China" does NOT define the product as junk.

Re: [Elecraft] KPA 500

: [Elecraft] KPA 500 I am watching this with great interest. If running stations on CW my KPA500 shows low-mid 50sC and I have never known what it should be. Thanks everyone. On Fri, Apr 10, 2020 at 10:27 Randy Farmer wrote: If the initial VSWR is really measuring 1.00:1 with low power

Re: [Elecraft] KPA 500

I try and spend the time to recover OLD PL-259 connectors.  I have some which I've owned for 30 to 40 years.  They are ugly, tarnished, and may have phenolic insulatorsbut are darn good connectors.    When I encounter a bad or connector, I usually chop the connector off with about 1" of

Re: [Elecraft] KPA 500

Amphenol more than likely does QC... So I would expect the majority of their connectors to be better than the possibly non QC tested connectors. I doubt most resellers QC the connectors. I am sure some do, but I would love to know which ones do. 73, and thanks, Dave (NK7Z) https://www.nk7z.

Re: [Elecraft] KPA 500

A vendor at Dayton told me *all* are made in China, even the ones marked Amphenol. k4ia, Buck K3s# 11497 Honor Roll 8B DXCC EasyWayHamBooks.com On 4/10/2020 12:43 PM, Irwin Darack wrote: Agreed. Many people buy the cheap ones made in Chinaand they fail. Irwin KD3TB On Fri, Apr 10, 2020

Re: [Elecraft] KPA 500

My first question is "what does it do on a dummy load?"  Sounds like something related to a bad or questionable jumper cable, loose connector or bad connectors.   I find many of today's connectors have machining tolerance errors and more so, have only "good looking" plating.  While in fact, man

Re: [Elecraft] KPA 500

Agreed. Many people buy the cheap ones made in Chinaand they fail. Irwin KD3TB On Fri, Apr 10, 2020 at 12:28 PM Jim Brown wrote: > On 4/10/2020 8:45 AM, Irwin Darack wrote: > > In my experience, coax connectors, barrel connectors, etc. are always > fail > > points when there is a sudden inc

Re: [Elecraft] KPA 500

On 4/10/2020 8:45 AM, Irwin Darack wrote: In my experience, coax connectors, barrel connectors, etc. are always fail points when there is a sudden increase in SWR as power is increased. They oxidize over time and sometimes just reconnecting or replacing is the first step before taking the amp apa

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