K3 temperature
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Since I fitted the second receiver, my K3 is running a whole
lot warmer, even on receive with the sub receiver turned off. In particular the front half of the right hand side panel is
almost hot and the front right hand corner of the top cover is also very warm. Before the second receiver installation the PA and FP
temperatures ran about the same, in the high 20’s if I remember. Just now
the FP temperature is nudging 44 degrees C and the PA is 36 C. This is after
the rig has been on for several hours, receive only, although it quickly heats
up to these temperatures when it is switched on. I am guessing that the air flow and thus the cooling ability
of the rig has been significantly impaired by the KRX3 and this is causing the
very high temperatures. I wonder if this has any long term reliability
implications ? I also wonder if others are experiencing similar temperature
issues with KRX3’s installed as I do not recall seeing any postings on
the subject. Barry Simpson VK2BJ _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Mine (S/N 56) with a 2nd receiver has been turned on
all day, and I see the PA @ 23C and the FP @ 29C. The room ambient is 63F 73! Ken Kopp - K0PP [hidden email] _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Barry Simpson
Hi Barry,
I installed the KRX3 in #24 here last week. My experience with temps is different from yours. Ambient temp: 22C FP temp: 23C PA temp 34C (this is right now - in the middle of NA winter) Chassis exterior doesn't have temps any different from before the KRX3 went in here. At least not so far. This was after the K3 had been sitting on for most of the afternoon. Now, it's possible that your ambient temp is different, given that you are set right in the middle of Summer there. However, I recorded FP and PA temps no higher than 36/48 here last summer. This was due to the fact that I was running a lot of high duty cycle PSK31 QSO's at the time. The ambient open-house temp was 35C, which is a little warm. And believe me, the fans were running! We were open-house because of a power outage, and with solar power the only inconvience was sweat. You might want to look at how your cables are dressed, esp. the one at the back from ANT receptacle to the KRX3. If your fans can't get started, this might explain the high-temp problem. If the cable is laying across the fan(s).... Also - make sure the KRX3 shield box isn't contacting anything on the RF Board. Check your DC power supply's metering to see if it pulls appreciably more current with the KRX3 installed. It seems unlikely that the KRX3 is the problem. But I'm not in your shoes. 73, matt, W6NIA On Mon, 26 Jan 2009 04:42:30 +0000, you wrote: >Since I fitted the second receiver, my K3 is running a whole lot warmer, >even on receive with the sub receiver turned off. > > > >In particular the front half of the right hand side panel is almost hot and >the front right hand corner of the top cover is also very warm. > > > >Before the second receiver installation the PA and FP temperatures ran about >the same, in the high 20's if I remember. Just now the FP temperature is >nudging 44 degrees C and the PA is 36 C. This is after the rig has been on >for several hours, receive only, although it quickly heats up to these >temperatures when it is switched on. > > > >I am guessing that the air flow and thus the cooling ability of the rig has >been significantly impaired by the KRX3 and this is causing the very high >temperatures. I wonder if this has any long term reliability implications ? > > > >I also wonder if others are experiencing similar temperature issues with >KRX3's installed as I do not recall seeing any postings on the subject. > > > >Barry Simpson VK2BJ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Barry Simpson
Hi Barry,
I have noticed the same. Here also, the FP temp settles at roughly 36C, receive only. This is much warmer than before I fitted the KRX3. Ambient temperature here is about 20C. I have not investigated this phenomenon any further yet. I do consider it to be a bit warmer than normal operating temperatures... 73, Frank PA4N At 05:42 26/01/2009, Barry Simpson wrote: >Content-Type: multipart/alternative; > boundary="----=_NextPart_000_0193_01C97F70.804F5FC0" >Content-Language: en-au > >Since I fitted the second receiver, my K3 is running a whole lot >warmer, even on receive with the sub receiver turned off. > >In particular the front half of the right hand side panel is almost >hot and the front right hand corner of the top cover is also very warm. > >Before the second receiver installation the PA and FP temperatures >ran about the same, in the high 20's if I remember. Just now the FP >temperature is nudging 44 degrees C and the PA is 36 C. This is >after the rig has been on for several hours, receive only, although >it quickly heats up to these temperatures when it is switched on. > >I am guessing that the air flow and thus the cooling ability of the >rig has been significantly impaired by the KRX3 and this is causing >the very high temperatures. I wonder if this has any long term >reliability implications ? > >I also wonder if others are experiencing similar temperature issues >with KRX3's installed as I do not recall seeing any postings on the subject. > >Barry Simpson VK2BJ >_______________________________________________ >Elecraft mailing list >Post to: [hidden email] >You must be a subscriber to post to the list. >Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > >Help: http://mailman.qth.net/subscribers.htm >Elecraft web page: http://www.elecraft.com --- drs. ing. F.R. Oppedijk Avista ICT Consultancy B.V. Albert Schweitzerlaan 7 1277 BV Huizen tel: 035 - 523 09 83 fax: 035 - 523 09 84 _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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> Since I fitted the second receiver, my K3 is running a whole lot
> warmer, even on receive with the sub receiver turned off. The aux DSP adds around 100 mA even when the sub receiver is turned off, as I recall, so some increase in temperature is normal. The KRX3 module itself adds nearly zero current when turned off, and I don't believe it could cause any increase in temperature since just due to its location above the RF board. When turned on, the KRX3 adds about 150-200 mA. All of the components are rated to handle much higher temperatures than you normally encounter (typically 70 C). However, I've never seen an FP temperature of higher than 41C, so if you're seeing 44C, you might check your FP temp calibration. Even 44C is very unlikely to be a problem. 73, Wayne N6KR --- http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Since K3 #145 has had it's sub receiver the forward area of the right hand side panel seems to get a little warmer and I've assumed this is due to the sub rx or second dsp drawing extra through the 2 voltage regs bolted to that panel. Shows it's all working ok since the panel is the heatsink for those devices.
I don't understand how you could suspect the sub rx of increasing the PA temperature if everything has been installed correctly. BTW: I took part in a local RTTY contest for the first time the other evening and was a little concerned about running full power despite reassurances here. Running about 95 watts for 90 contest minutes I kept an eye on the PA temperature and it never went above 46 deg; I put my hand over the back once or twice and the fans seemed to be running but only slowly. I'm now reassured......... Stewart Rolfe, GW0ETF
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In reply to this post by Matt Zilmer
Well...
I must agree that, since the addition of the KRX3 in my K3, the internal temps HAVE risen on the order of about 10 deg. C overall... However, this is NOT anything I didn't expect... in fact, I seem to recall that Wayne even posted (somewhere) that KRX3 users would notice higher internal temps. What bothers me, a bit, is that my cooling fans seem to be running a LOT more frequently, and at higher speeds, than they did several firmware versions ago. I've mentioned this on the K3 Field Test reflector, but no one has risen to comment upon my observations. 73, Tom Hammond N0SS At 23:06 01/25/2009, Matt Zilmer wrote: >Hi Barry, > >I installed the KRX3 in #24 here last week. My experience with temps >is different from yours. > >Ambient temp: 22C >FP temp: 23C >PA temp 34C >(this is right now - in the middle of NA winter) > >Chassis exterior doesn't have temps any different from before the KRX3 >went in here. At least not so far. > >This was after the K3 had been sitting on for most of the afternoon. >Now, it's possible that your ambient temp is different, given that you >are set right in the middle of Summer there. However, I recorded FP >and PA temps no higher than 36/48 here last summer. This was due to >the fact that I was running a lot of high duty cycle PSK31 QSO's at >the time. The ambient open-house temp was 35C, which is a little >warm. And believe me, the fans were running! We were open-house >because of a power outage, and with solar power the only inconvience >was sweat. > >You might want to look at how your cables are dressed, esp. the one at >the back from ANT receptacle to the KRX3. If your fans can't get >started, this might explain the high-temp problem. If the cable is >laying across the fan(s).... > >Also - make sure the KRX3 shield box isn't contacting anything on the >RF Board. Check your DC power supply's metering to see if it pulls >appreciably more current with the KRX3 installed. > >It seems unlikely that the KRX3 is the problem. But I'm not in your >shoes. > >73, >matt, W6NIA > >On Mon, 26 Jan 2009 04:42:30 +0000, you wrote: > > >Since I fitted the second receiver, my K3 is running a whole lot warmer, > >even on receive with the sub receiver turned off. > > > > > > > >In particular the front half of the right hand side panel is almost hot and > >the front right hand corner of the top cover is also very warm. > > > > > > > >Before the second receiver installation the PA and FP temperatures ran about > >the same, in the high 20's if I remember. Just now the FP temperature is > >nudging 44 degrees C and the PA is 36 C. This is after the rig has been on > >for several hours, receive only, although it quickly heats up to these > >temperatures when it is switched on. > > > > > > > >I am guessing that the air flow and thus the cooling ability of the rig has > >been significantly impaired by the KRX3 and this is causing the very high > >temperatures. I wonder if this has any long term reliability implications ? > > > > > > > >I also wonder if others are experiencing similar temperature issues with > >KRX3's installed as I do not recall seeing any postings on the subject. > > > > > > > >Barry Simpson VK2BJ >_______________________________________________ >Elecraft mailing list >Post to: [hidden email] >You must be a subscriber to post to the list. >Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > >Help: http://mailman.qth.net/subscribers.htm >Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Barry Simpson
Tom N0SS said
>What bothers me, a bit, is that my cooling fans seem to be running a LOT >more frequently, and at higher speeds, than they did several firmware >versions ago. My FP temperature rose from 18 C to 35 C in a three-hour test yesterday. I don't believe the fans came on but not sure as I can't hear them. When ever I look at them they are not running. The PA temp rose from 17 C to 25 C over the same period. (I may have transmitted a short SSB period, can't remember). So I am wondering at what temperature the fans come on and where that temperature is measured. Mike Scott - AE6WA Tarzana, CA (DM04 / near LA) K3-100 #508/ KX1 #1311 _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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The fans only come on in response to the PA temp sensor. In a future
release they'll also come on if the FP temperature is excessive. But so far, I haven't seen any reports of excessive FP temperature -- they're all in the acceptable range. 73, Wayne N6KR On Jan 27, 2009, at 6:21 AM, Mike Scott wrote: > > My FP temperature rose from 18 C to 35 C in a three-hour test > yesterday. --- http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K3 temperature
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Hi,
I'd like to suggest that Enhancements and App notes be assigned numbers, so they'll be easier to keep track of. 73, doug _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by wayne burdick
That's interesting. I would think that the PA shielding and top
venting would make the fans pretty ineffective for cooling the FP. Or is the idea that if the FP is too warm, the PA is probably too warm as well, regardless of the reported PA temp? 73 -- Joe KB8AP On Jan 27, 2009, at 8:39 AM, wayne burdick wrote: > The fans only come on in response to the PA temp sensor. In a future > release they'll also come on if the FP temperature is excessive. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K3 Numbering of Enhancements and App Notes
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In reply to this post by Doug Faunt N6TQS +1-510-655-8604
Doug: I suggested this to Gary a number of weeks ago and he said he would
pass it along. 73 Doug, VE3MV ----- Original Message ----- From: "Doug Faunt N6TQS +1-510-655-8604" <[hidden email]> To: <[hidden email]> Sent: Tuesday, January 27, 2009 11:44 AM Subject: Re: [Elecraft] K3 temperature > Hi, > I'd like to suggest that Enhancements and App notes be assigned numbers, so > they'll be easier to keep track of. > > 73, doug > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > > -- I am using the free version of SPAMfighter. We are a community of 5.9 million users fighting spam. SPAMfighter has removed 1012 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len The Professional version does not have this message _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by wayne burdick
Speaking of temperature - A week or two ago I complained
about the fans continuously speeding up and slowing down during a contest. Since then I have set the fans to run continuously at low speed (config kpa3=fn1). The fans are almost inaudible at this speed, and I didn't hear them cycling up and down during the 160 cw or bartg sprint contests. The rigs were running only 50 watts though, driving high gain amps. The NAQP RTTY contest is coming up on Feb 28. That's a 100w RTTY contest. The rigs will get a workout there. I'll keep an eye on pa temp and fan speed. I did verify that with kpa3=fn1, the fans do speed up if pa temp rises. Dave Hachadorian, K6LL Yuma, AZ ----- Original Message ----- From: "wayne burdick" <[hidden email]> To: <[hidden email]> Cc: <[hidden email]> Sent: Tuesday, January 27, 2009 4:39 PM Subject: Re: [Elecraft] K3 temperature > The fans only come on in response to the PA temp sensor. > In a future > release they'll also come on if the FP temperature is > excessive. But so > far, I haven't seen any reports of excessive FP > temperature -- they're > all in the acceptable range. > > 73, > Wayne > N6KR > > On Jan 27, 2009, at 6:21 AM, Mike Scott wrote: >> >> My FP temperature rose from 18 C to 35 C in a three-hour >> test >> yesterday. > > > --- > > http://www.elecraft.com > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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