KPA500 Fuse blown
Locked
12
12
 
|
I was in the WAE rtty contest today when I heard a pop fizz, Red fault lamp on the kpa500 was lit up and 60v err in the window.
I reset this fault, (switch off, and on) 2 hrs later I had another err fault, this time 270v err, I again reset the amp, 2hrs passed and had another 60v err, but this time the amp would not reset, it was powerless! Checked the Amp 6A fuses and they were dead. Is this a known problem! And can I get those 6A fuses here in the UK, or only available via Elecraft! Cheers Ken.. G0ORH Sent from my iPad ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
|
|
Hi Ken,
The fuse used is extremely popular in the US so I'd be surprised if it is not also readily available in the UK. The common reference is type 3AG fast blow cylindrical fuse and it is 6 amp at 250 volt. Here's a Littlefuse part number 0312006.HXP. If you follow this link you'll be able to see a data sheet. The diameter is 6.35mm and the length is 31.75mm. http://www.mouser.com/ProductDetail/Littelfuse/0312006HXP/?qs=sGAEpiMZZMsIz3CjQ1xegWrlMY7vL59hjcmRNw8S59U%3d 73, Mike K2MK
|
|
|
In reply to this post by Ken Chandler
Ken, How much power out were you running on RTTY with your KPA500? I'm interested because I have the amp, but have not yet used it on digital modes (use the K3 barefoot at 25 W or so). Phil W7OX On 11/9/14 11:06 AM, Ken Chandler wrote: > I was in the WAE rtty contest today when I heard a pop fizz, Red fault lamp on the kpa500 was lit up and 60v err in the window. > I reset this fault, (switch off, and on) 2 hrs later I had another err fault, this time 270v err, I again reset the amp, 2hrs passed and had another 60v err, but this time the amp would not reset, it was powerless! > Checked the Amp 6A fuses and they were dead. > Is this a known problem! And can I get those 6A fuses here in the UK, or only available via Elecraft! > > Cheers > > > Ken.. G0ORH > > Sent from my iPad > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
|
|
On Sun,11/9/2014 2:18 PM, Phil Wheeler wrote:
> How much power out were you running on RTTY with your KPA500? I'm > interested because I have the amp, but have not yet used it on digital > modes (use the K3 barefoot at 25 W or so). During KPA500 beta, I was loaned one for a major RTTY contest weekend and told to run it "with all the lights lit." I did, and it worked fine. In the 3-4 years I've owned one, I regularly run it at full power in digital modes on all bands, 160-6M. When it gets warm, the fan speeds up, but it continues to put out full power. This includes digital modes like FSK441 and JT65A on 6M, and lots of RTTY on the HF bands. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA500 Power In Digital Modes
|
|
On Mon, Nov 10, 2014 at 9:34 AM, Jim Brown <[hidden email]>
wrote: > On Sun,11/9/2014 2:18 PM, Phil Wheeler wrote: > >> How much power out were you running on RTTY with your KPA500? I'm >> interested because I have the amp, but have not yet used it on digital >> modes (use the K3 barefoot at 25 W or so). >> > > During KPA500 beta, I was loaned one for a major RTTY contest weekend and > told to run it "with all the lights lit." I did, and it worked fine. In the > 3-4 years I've owned one, I regularly run it at full power in digital modes > on all bands, 160-6M. When it gets warm, the fan speeds up, but it > continues to put out full power. This includes digital modes like FSK441 > and JT65A on 6M, and lots of RTTY on the HF bands. > > NV WARC bands at full output, ran as cool as a clam. 73 jeff wk6i -- Jeff Stai ~ [hidden email] Twisted Oak Winery ~ http://www.twistedoak.com/ Facebook ~ http://www.facebook.com/twistedoak ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
|
|
In reply to this post by Jim Brown-10
On Mon, 10 Nov 2014 09:34:09 -0800, Jim Brown wrote:
> During KPA500 beta, I was loaned one for a major RTTY contest weekend > and told to run it "with all the lights lit." I did, and it worked fine. > In the 3-4 years I've owned one, I regularly run it at full power in > digital modes on all bands, 160-6M. When it gets warm, the fan speeds > up, but it continues to put out full power. This includes digital modes > like FSK441 and JT65A on 6M, and lots of RTTY on the HF bands. I'm not a contester, but have done similar with mine with no issue. The fan will scream at you as it gets above 70C, but the temp levels out. I'm not one to push much beyond that, as that's all the warmer it gets in JT exchanges running power. No lectures on low power for JT, I run power depending on propagation, or lack thereof, mostly on a dead six meter band. Gary ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA500 Power In Digital Modes
|
|
> No lectures on low power for JT, I run power depending on > propagation, or lack thereof, mostly on a dead six meter band. Note that JT65 and JT9 are designed to be suitable for saturated amplifiers as there is only a single tone at a time and one tone ramps down before the next tone ramps up. *DO NOT* try running PSK, MFSK, etc. modes at 600W average power from a KPA-500 as you will be generating serious IMD and garbage. Depending on the crest factor (peak to average ratio) of the mode in use, the average power from the KPA-5000 should be kept 6 to 10 dB below the rated maximum (e.g., 60 to 150 watts) just as a 100W transceiver should be kept between 10 and 25 watts average. 73, ... Joe, W4TV On 2014-11-10 6:56 PM, [hidden email] wrote: > On Mon, 10 Nov 2014 09:34:09 -0800, Jim Brown wrote: > >> During KPA500 beta, I was loaned one for a major RTTY contest weekend >> and told to run it "with all the lights lit." I did, and it worked fine. >> In the 3-4 years I've owned one, I regularly run it at full power in >> digital modes on all bands, 160-6M. When it gets warm, the fan speeds >> up, but it continues to put out full power. This includes digital modes >> like FSK441 and JT65A on 6M, and lots of RTTY on the HF bands. > > I'm not a contester, but have done similar with mine with no issue. The fan > will scream at you as it gets above 70C, but the temp levels out. I'm not one > to push much beyond that, as that's all the warmer it gets in JT exchanges > running power. No lectures on low power for JT, I run power depending on > propagation, or lack thereof, mostly on a dead six meter band. > > Gary > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
|
|
On Mon, 10 Nov 2014 19:30:01 -0500, Joe Subich, W4TV wrote:
> Note that JT65 and JT9 are designed to be suitable for saturated > amplifiers as there is only a single tone at a time and one tone > ramps down before the next tone ramps up. *DO NOT* try running > PSK, MFSK, etc. modes at 600W average power from a KPA-500 as you > will be generating serious IMD and garbage. Correct. Full linearity is needed for these modes to keep IMD under control. Gary ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
|
|
In reply to this post by mcduffie
On Mon, 10 Nov 2014 16:56:57 -0700, [hidden email] wrote:
> I'm not one > to push much beyond that, as that's all the warmer it gets in JT exchanges > running power. No lectures on low power for JT, I run power depending on > propagation, or lack thereof, mostly on a dead six meter band. I should add, I'll be glad to make test temp readings for anyone wanting them. I have a digital thermometer sensor in the fan grate to show outlet temperatures and I monitor the internal temp via the front panel readout any time I'm using it, even when on SSB, where the fan almost never runs. In addition, I have an IR thermometer and can spot check anywhere outside the temp (except bottom) for you if needed. Just contact me directly. Gary ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA500 Power In Digital Modes
|
|
In reply to this post by Joe Subich, W4TV-4
On Mon,11/10/2014 4:30 PM, Joe Subich, W4TV wrote:
> *DO NOT* try running > PSK, MFSK, etc. modes at 600W average power from a KPA-500 as you > will be generating serious IMD and garbage. Recent measurements I've done of a K3 driving a KPA500 both with pink noise on USB and keyed CW show that not to be the case. Yes, bandwidth increases a few dB from 400W to 600W, but I would NOT call it serious. This is preliminary work and a preliminary report. At its current stage, it's a proof of concept.As I have time (and the radios to test), I plan to look at lot of others. I've just lined up a couple in the FT1000MP family. P3SprectrumMeasurementsSlides.pdf 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA500 Power In Digital Modes
|
|
In reply to this post by mcduffie
On Mon,11/10/2014 4:59 PM, [hidden email] wrote:
> Full linearity is needed for these modes to keep IMD under control. Huh? "Full linearity" would be zero distortion. ALL amplifiers have some amplitude distortion. See ARRL test results for a sample of current products. 2-tone IMD in the range of -30dB is pretty common. In the link I just posted, look at the occupied bandwidth of the K3 driving a KPA500 to full power, and to a few dB less power, then compare to the K3 driving a triode tube amp to legal limit. The IMD sidedbands are clearly visible, even with a CW signal -- remember that a CW signal is a carrier amplitude modulated by a square wave. The square wave has harmonic content (as a function of its rise time and shaping), so it produces IM. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA500 Power In Digital Modes
|
|
In reply to this post by Jim Brown-10
On Mon,11/10/2014 11:20 PM, Jim Brown wrote:
> P3SprectrumMeasurementsSlides.pdf That should be k9yc.com/P3SprectrumMeasurementsSlides.pdf ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA500 Power In Digital Modes
|
|
In reply to this post by mcduffie
On 11/10/2014 5:56 PM, [hidden email] wrote:
> On Mon, 10 Nov 2014 09:34:09 -0800, Jim Brown wrote: > >> During KPA500 beta, I was loaned one for a major RTTY contest weekend >> and told to run it "with all the lights lit." I did, and it worked fine. >> In the 3-4 years I've owned one, I regularly run it at full power in >> digital modes on all bands, 160-6M. When it gets warm, the fan speeds >> up, but it continues to put out full power. This includes digital modes >> like FSK441 and JT65A on 6M, and lots of RTTY on the HF bands. I cannot get my KPA500 to run more than about 200W on 6M without getting a PA DISS fault. Temp is not even up to 60C yet. Between that and the KAT500 coming 'untuned' and faulting in the middle of a QSO on 10M, I'm about ready to throw them both in the trash and go back to my tube amp. Mike KI0HA ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA500 Power In Digital Modes
|
|
In reply to this post by Jim Brown-10
Funny, just yesterday I was looking at CW signals on my P3, noting the
skinny ones and the ones with fat bottoms. When you listen off the side of the fat ones, of course, you can hear the clicks. I happened to tune to one of the skinny ones just in time to hear the operator say he was a using a K3. On 11 Nov 2014 10:08, Jim Brown wrote: > On Mon,11/10/2014 11:20 PM, Jim Brown wrote: >> P3SprectrumMeasurementsSlides.pdf > > That should be k9yc.com/P3SprectrumMeasurementsSlides.pdf -- 73, Vic, 4X6GP/K2VCO Rehovot, Israel http://www.qsl.net/k2vco/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA500 Power In Digital Modes
|
|
In reply to this post by Michael Eberle
This happened with my KPA500 until I realized that my Microham double-six antenna switch is only rated to max 30MHz. The SWR was fine, but KPA 500 kept faulting on 6 with High PA DISS fault code. Once i connected my 3el SteppIR directly into the amp, it works full steam on 6 meters.
73, Nick ve3ey "I cannot get my KPA500 to run more than about 200W on 6M without getting a PA DISS fault. Temp is not even up to 60C yet." > On Nov 11, 2014, at 5:30 AM, Michael Eberle <[hidden email]> wrote: > > I cannot get my KPA500 to run more than about 200W on 6M without getting a PA DISS fault. Temp is not even up to 60C yet. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA500 Power In Digital Modes
|
|
In reply to this post by Jim Brown-10
Don't do it! If you can't get an answer here, contact Elecraft support. Your KPA500 will work great on 6m once you get this issue resolved. Mine runs at 600w on 6m meteor scatter using FSK441 30 seconds on, 30 seconds off, for hours on end, hitting 65C but soldiering on without complaint. That would leave my former dual 3-500Z amp squeaking from the freaking.
73 Eric WD6DBM Michael Eberle <[hidden email]> wrote: >On 11/10/2014 5:56 PM, [hidden email] wrote: >> On Mon, 10 Nov 2014 09:34:09 -0800, Jim Brown wrote: >> >>> During KPA500 beta, I was loaned one for a major RTTY contest weekend >>> and told to run it "with all the lights lit." I did, and it worked fine. >>> In the 3-4 years I've owned one, I regularly run it at full power in >>> digital modes on all bands, 160-6M. When it gets warm, the fan speeds >>> up, but it continues to put out full power. This includes digital modes >>> like FSK441 and JT65A on 6M, and lots of RTTY on the HF bands. >I cannot get my KPA500 to run more than about 200W on 6M without getting >a PA DISS fault. Temp is not even up to 60C yet. >Between that and the KAT500 coming 'untuned' and faulting in the middle >of a QSO on 10M, I'm about ready to throw them both in the >trash and go back to my tube amp. > >Mike >KI0HA >______________________________________________________________ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: mailto:[hidden email] > >This list hosted by: http://www.qsl.net >Please help support this email list: http://www.qsl.net/donate.html >Message delivered to [hidden email] Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA500 Power In Digital Modes
|
|
Yes, I suppose something may just need a slight adjustment. It just
frustrates me when things don't work like I expect them to. I was always afraid to run JT65 at more than 80-100 watts until I saw this post. Started trying higher power while keeping a close eye on the temp. No faults on any band but 6M if it gets much over 200 watts (8 watts drive). It seems to be running 450 watts easily on 160M. On 11/11/2014 5:44 AM, Eric Norris wrote: > Don't do it! If you can't get an answer here, contact Elecraft support. Your KPA500 will work great on 6m once you get this issue resolved. Mine runs at 600w on 6m meteor scatter using FSK441 30 seconds on, 30 seconds off, for hours on end, hitting 65C but soldiering on without complaint. That would leave my former dual 3-500Z amp squeaking from the freaking. > > 73 > > Eric WD6DBM > > Michael Eberle <[hidden email]> wrote: > >> On 11/10/2014 5:56 PM, [hidden email] wrote: >>> On Mon, 10 Nov 2014 09:34:09 -0800, Jim Brown wrote: >>> >>>> During KPA500 beta, I was loaned one for a major RTTY contest weekend >>>> and told to run it "with all the lights lit." I did, and it worked fine. >>>> In the 3-4 years I've owned one, I regularly run it at full power in >>>> digital modes on all bands, 160-6M. When it gets warm, the fan speeds >>>> up, but it continues to put out full power. This includes digital modes >>>> like FSK441 and JT65A on 6M, and lots of RTTY on the HF bands. >> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
|
|
In reply to this post by Jim Brown-10
On Tue, 11 Nov 2014 00:06:53 -0800, Jim Brown wrote:
> Huh? "Full linearity" would be zero distortion. I knew I shouldn't have used that word. :o) Gary ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
|
|
In reply to this post by Michael Eberle
On Tue, 11 Nov 2014 04:30:17 -0600, Michael Eberle wrote:
> I cannot get my KPA500 to run more than about 200W on 6M without getting > a PA DISS fault. Temp is not even up to 60C yet. > Between that and the KAT500 coming 'untuned' and faulting in the middle > of a QSO on 10M, I'm about ready to throw them both in the > trash and go back to my tube amp. Sounds like you have some problem between the amplifier and the antenna. Yes, that's a broad area, but includes it all. I had similar problem for awhile and found various small things that lower power didn't show up. Clean up the system, get rid of bad jumpers, clean the connections, and try it again. But first, shove a dummy load on it and see that it runs full power with no problem. If it doesn't, make sure the load is plugged directly into the amp with a good jumper. Eliminate every connection one by one until you find it...and then keep looking all the way to the antenna to clean up the whole system. Gary ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA500 Power In Digital Modes
|
|
In reply to this post by Jim Brown-10
Jim, > Recent measurements I've done of a K3 driving a KPA500 both with pink > noise on USB and keyed CW show that not to be the case. Your measurements are not of the conditions I describe. You are using *filtered and band limited pink noise* (slide #3 - EQ settings) not the specific digital signals I mention *and* your measurements are at PEP not average power (slide #2 - LP-100A set to peak). In addition, unfiltered pink noise has a crest factor (peak to average ratio) of 3 dB which you are further reducing by compression in the K3 - not the 6 to 10 dB crest factors of the specified digital modes which *can not* be compressed without significant distortion and IMD. Your measurements, while interesting, do not accurately simulate the specified digital modes are not applicable in this case. 73, ... Joe, W4TV On 2014-11-11 2:20 AM, Jim Brown wrote: > On Mon,11/10/2014 4:30 PM, Joe Subich, W4TV wrote: >> *DO NOT* try running >> PSK, MFSK, etc. modes at 600W average power from a KPA-500 as you >> will be generating serious IMD and garbage. > > Recent measurements I've done of a K3 driving a KPA500 both with pink > noise on USB and keyed CW show that not to be the case. Yes, bandwidth > increases a few dB from 400W to 600W, but I would NOT call it serious. > This is preliminary work and a preliminary report. At its current stage, > it's a proof of concept.As I have time (and the radios to test), I plan > to look at lot of others. I've just lined up a couple in the FT1000MP > family. > > P3SprectrumMeasurementsSlides.pdf > > 73, Jim K9YC > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
«
Return to Elecraft
|
1 view|%1 views
| Free forum by Nabble | Edit this page |