Re: [Elecraft] Max power for JT9 with K3S 100?
The moonbounce boys use a KW or more...
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 4/4/20 9:01 PM, brianchapnick wrote:
This discussion fascinates me only in that I wonder why you are using so much
power for weak signal modes? 5 or 10 watts should be plenty even with a
compromised antenna and poor band conditions..or am I missing
somthing.Brian VE3GMZ Sent from my Samsung Galaxy smartphone.
Original message From: Bob McGraw K4TAX Date: 2020-04-04 8:19 p.m. (GMT-05:00) To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Max power for JT9 with K3S 100? Frank et al;Just quoted what is in the K3S manual. No interpretation provided. I agree that 100 watts key down is a lot for a SSB amplifier running in CW mode. To me that says 100 watts for 10 minutes and then RX for 10 minutes. Otherwise equal TX and RX times. Who does that?And if one is running "100 watts" then running CW or SSB for 10 minutes might be the limit. Just speculation. On AM
I might talk for 10 minutes but that is at 25% rated power output for carrier, yet it is 100 watts PEP. The 60 C is MY guideline. The KPA3A will shut down about 85 C or so.On 6M I run my KPA500 at about 300 to 400 watts. The K3S is running about 25 to 30 watts on 6M. At this point I'm watching the KPA500 temperature.There is NO DX worth blowing a PA either in the K3S or the KPA500. But I know guys that will blow things up, pushing things to the max and beyond trying to work that DX station. I say bah humbug to that!I just pay attention to the PA temp, specially when running digital modes. Likewise for the
KPA500.73Bob, K4TAXOn 4/4/2020 3:41 PM, Frank O'Donnell wrote:> Thanks for the replies.>> I've enabled the PA temp display (currently showing 22C right after > power-up but before transmitting), and will keep an eye on that.>> Bob, I noticed that line in the K3S manual about the CW/SSB duty > cycle. Does "100% - 10 min, 100 W key-down" mean that if you key down > without stop in CW mode it can go 10 minutes at 100 watts? That seems > like an awful lot.>> Where do the recommended TPO's for 6 meters, the 50% value for JT9, > and the 60C guideline for the PA temp come
from?>> Thanks again,>> Frank K6FOD>>> On 4/4/20 6:22 AM, John Simmons wrote:>> Fred Cady's book: "There are four fans speeds that turn on at different temperatures.">> "If the temperature reaches 84 degrees C the KPA3 will be bypassed >> until the temperature falls to stop any damage as a last-ditch backup >> measure to protect your expensive power transistors from the excess >> heat." -de John NI0K>> Bob McGraw K4TAX wrote on 4/3/2020 6:39 PM:>>> Frank:>> The duty
cycle for the transmitter, as stated in the manual, is; CW >>> and SSB modes, 100% - 10 min, 100 W key-down at 25C ambient. Do >>> note that 6M has reduce power values of 85 watts {51 -52 MHz} or 70 >>> watts {52 - 54 MHz}>> The duty cycle for JT-9, 1 minute transmit, 1 minute receive would >>> be 50%. I frequently run 100 watts on WSJT-X FT-8 with no issues. >>> Just pay attention to PA temperature. It should be 60 C or less. >>> Also this is with FANS in the automatic mode.>> 73>> Bob,
K4TAX> On 4/3/2020 4:18 PM, Frank O'Donnell wrote: I've been using JT9 mode on 630m this winter with my K3S outputting to an external class D amp. Now I'm interested in trying some JT9 QSOs with some people currently operating on 160m. For me this would mean outputting directly from the K3S (with internal tuner) to the antenna. Given the 1-minute cycle time for JT9, are there recommendations (official from Elecraft, or otherwise) on
maximum power to use in a situation like this? And/or, is the answer dependent on the SWR I can achieve with the antenna? Thanks and 73, Frank K6FOD>> __> 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: http://www.qsl.net/donate.html> Message
delivered to rmcg...@blomand.net __Elecraft mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:elecr...@mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.htmlMessage delivered to brianchapn...@rogers.com
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Re: [Elecraft] Max power for JT9 with K3S 100?
On 4/4/2020 9:01 PM, brianchapnick wrote: This discussion fascinates me only in that I wonder why you are using so much power for weak signal modes? 5 or 10 watts should be plenty even with a compromised antenna and poor band conditions..or am I missing somthing. Yes. "Weak signal" does NOT mean low power. "Weak signal" is define by the path, the frequency, noise levels on each end, and antennas. When I'm trying to work EU on 160 and 80 from my QTH near San Francisco, I'm running legal limit. When I'm working double-hop (or more hops) E-skip on 6M, and meteor scatter on 6M, I'm running legal limit. And when I'm running power like that, I almost never fill up the band with CQs. Don't get me wrong -- I have >170 countries worked QRP, DXCC on 20 and 15 QRP, all CW or SSB. I rarely run FT8 on other bands, although I've been doing it a bit on 60M and 30M, and I don't run much power there. There is a time and place for everything. :) 73, Jim K9YC __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Max power for JT9 with K3S 100?
Because it’s weak signal at the receiving end; you use what power it takes to
succeed in making the contact, up to the legal limit.
On 160M, 1500 watts out is common.
Rick NK7I
Smell Czech corruptions are inevitable
> On Apr 4, 2020, at 9:02 PM, brianchapnick wrote:
>
> This discussion fascinates me only in that I wonder why you are using so
> much power for weak signal modes? 5 or 10 watts should be plenty even with a
> compromised antenna and poor band conditions..or am I missing
> somthing.Brian VE3GMZ Sent from my Samsung Galaxy smartphone.
> Original message From: Bob McGraw K4TAX
> Date: 2020-04-04 8:19 p.m. (GMT-05:00) To:
> elecraft@mailman.qth.net Subject: Re: [Elecraft] Max power for JT9 with K3S
> 100? Frank et al;Just quoted what is in the K3S manual. No interpretation
> provided. I agree that 100 watts key down is a lot for a SSB amplifier
> running in CW mode. To me that says 100 watts for 10 minutes and then RX
> for 10 minutes. Otherwise equal TX and RX times. Who does that?And if one
> is running "100 watts" then running CW or SSB for 10 minutes might be the
> limit. Just speculation. On AM I might talk for 10 minutes but that is at
> 25% rated power output for carrier, yet it is 100 watts PEP. The 60 C is MY
> guideline. The KPA3A will shut down about 85 C or so.On 6M I run my KPA500 at
> about 300 to 400 watts. The K3S is running about 25 to 30 watts on 6M. At
> this point I'm watching the KPA500 temperature.There is NO DX worth blowing a
> PA either in the K3S or the KPA500.But I know guys that will blow things
> up, pushing things to the max and beyond trying to work that DX station. I
> say bah humbug to that!I just pay attention to the PA temp, specially when
> running digital modes. Likewise for the KPA500.73Bob, K4TAXOn 4/4/2020 3:41
> PM, Frank O'Donnell wrote:> Thanks for the replies.>> I've enabled the PA
> temp display (currently showing 22C right after > power-up but before
> transmitting), and will keep an eye on that.>> Bob, I noticed that line in
> the K3S manual about the CW/SSB duty > cycle. Does "100% - 10 min, 100 W
> key-down" mean that if you key down > without stop in CW mode it can go 10
> minutes at 100 watts? That seems > like an awful lot.>> Where do the
> recommended TPO's for 6 meters, the 50% value for JT9, > and the 60C
> guideline for the PA temp come from?>> Thanks again,>> Frank K6FOD>>> On
> 4/4/20 6:22 AM, John Simmons wrote:>> Fred Cady's book: "There are four
> fans speeds that turn on at different temperatures.">> "If the temperature
> reaches 84 degrees C the KPA3 will be bypassed >> until the temperature falls
> to stop any damage as a last-ditch backup >> measure to protect your
> expensive power transistors from the excess >> heat." -de John NI0K>>
> Bob McGraw K4TAX wrote on 4/3/2020 6:39 PM:>>> Frank:>> The duty cycle
> for the transmitter, as stated in the manual, is; CW >>> and SSB modes, 100%
> - 10 min, 100 W key-down at 25C ambient. Do >>> note that 6M has reduce
> power values of 85 watts {51 -52 MHz} or 70 >>> watts {52 - 54 MHz}>> The
> duty cycle for JT-9, 1 minute transmit, 1 minute receive would >>> be 50%.
> I frequently run 100 watts on WSJT-X FT-8 with no issues. >>> Just pay
> attention to PA temperature. It should be 60 C or less. >>> Also this is
> with FANS in the automatic mode.>> 73>> Bob, K4TAX> On
> 4/3/2020 4:18 PM, Frank O'Donnell wrote: I've been using JT9 mode on 630m
> this winter with my K3S outputting to an external class D amp.
> Now I'm interested in trying some JT9 QSOs with some people currently
> operating on 160m. For me this would mean outputting directly from the
> K3S (with internal tuner) to the antenna. Given the 1-minute cycle
> time for JT9, are there recommendations (official from Elecraft, or
> otherwise) on maximum power to use in a situation like this? And/or, is
> the answer dependent on the SWR I can achieve with the antenna?
> Thanks and 73, Frank K6FOD>>
> __> Elecraft
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> http://mailman.qth.net/mmfaq.htm> Post: mailto:Elecraft@mailman.qth.net>>
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Re: [Elecraft] Max power for JT9 with K3S 100?
This discussion fascinates me only in that I wonder why you are using so much
power for weak signal modes? 5 or 10 watts should be plenty even with a
compromised antenna and poor band conditions..or am I missing
somthing.Brian VE3GMZ Sent from my Samsung Galaxy smartphone.
Original message From: Bob McGraw K4TAX
Date: 2020-04-04 8:19 p.m. (GMT-05:00) To: elecraft@mailman.qth.net Subject:
Re: [Elecraft] Max power for JT9 with K3S 100? Frank et al;Just quoted what is
in the K3S manual. No interpretation provided. I agree that 100 watts key
down is a lot for a SSB amplifier running in CW mode. To me that says 100
watts for 10 minutes and then RX for 10 minutes. Otherwise equal TX and RX
times. Who does that?And if one is running "100 watts" then running CW or SSB
for 10 minutes might be the limit. Just speculation. On AM I might talk for
10 minutes but that is at 25% rated power output for carrier, yet it is 100
watts PEP. The 60 C is MY guideline. The KPA3A will shut down about 85 C or
so.On 6M I run my KPA500 at about 300 to 400 watts. The K3S is running about
25 to 30 watts on 6M. At this point I'm watching the KPA500 temperature.There
is NO DX worth blowing a PA either in the K3S or the KPA500. But I know guys
that will blow things up, pushing things to the max and beyond trying to work
that DX station. I say bah humbug to that!I just pay attention to the PA temp,
specially when running digital modes. Likewise for the KPA500.73Bob, K4TAXOn
4/4/2020 3:41 PM, Frank O'Donnell wrote:> Thanks for the replies.>> I've
enabled the PA temp display (currently showing 22C right after > power-up but
before transmitting), and will keep an eye on that.>> Bob, I noticed that line
in the K3S manual about the CW/SSB duty > cycle. Does "100% - 10 min, 100 W
key-down" mean that if you key down > without stop in CW mode it can go 10
minutes at 100 watts? That seems > like an awful lot.>> Where do the
recommended TPO's for 6 meters, the 50% value for JT9, > and the 60C guideline
for the PA temp come from?>> Thanks again,>> Frank K6FOD>>> On 4/4/20 6:22 AM,
John Simmons wrote:>> Fred Cady's book: "There are four fans speeds that
turn on at different temperatures.">> "If the temperature reaches 84 degrees C
the KPA3 will be bypassed >> until the temperature falls to stop any damage as
a last-ditch backup >> measure to protect your expensive power transistors from
the excess >> heat." -de John NI0K>> Bob McGraw K4TAX wrote on 4/3/2020
6:39 PM:>>> Frank:>> The duty cycle for the transmitter, as stated in the
manual, is; CW >>> and SSB modes, 100% - 10 min, 100 W key-down at 25C
ambient. Do >>> note that 6M has reduce power values of 85 watts {51 -52 MHz}
or 70 >>> watts {52 - 54 MHz}>> The duty cycle for JT-9, 1 minute transmit,
1 minute receive would >>> be 50%. I frequently run 100 watts on WSJT-X FT-8
with no issues. >>> Just pay attention to PA temperature. It should be 60 C
or less. >>> Also this is with FANS in the automatic mode.>> 73>>
Bob, K4TAX> On 4/3/2020 4:18 PM, Frank O'Donnell wrote: I've been
using JT9 mode on 630m this winter with my K3S outputting to an external
class D amp. Now I'm interested in trying some JT9 QSOs with some
people currently operating on 160m. For me this would mean outputting
directly from the K3S (with internal tuner) to the antenna. Given the
1-minute cycle time for JT9, are there recommendations (official from
Elecraft, or otherwise) on maximum power to use in a situation like this?
And/or, is the answer dependent on the SWR I can achieve with the
antenna? Thanks and 73, Frank K6FOD>>
__> Elecraft
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[Elecraft] Elecraft CW Net Announcement
Good Evening, Snow, rain, and hail fell each day this week. The daffodils which sprouted a few weeks ago have yet to bloom. But the forecast is for sun and maybe even 50 degrees on Monday. I had many plans for spring and summer; most of them will have to be postponed. There is a real sunspot this week. One of solar cycle 25 crossing the northern part of the sun. A few other celestial sightings are Venus in conjunction with the Pleiades and our summer comet keeps brightening. Projections are for it to be visible during daylight hours. We shall see. The hummingbirds are active, they will force me in to town this week. I haven't been off the property since the first week of March. I expect I will see everything in black and white with Rod Serling narration. Please join us on (or near): 14050 kHz at 2200z Sunday (3 PM PDT Sunday) 7047 kHz at z Monday (5 PM PDT Sunday) 73, Kevin. KD5ONS _ __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Max power for JT9 with K3S 100?
Frank et al;
Just quoted what is in the K3S manual. No interpretation provided. I
agree that 100 watts key down is a lot for a SSB amplifier running in CW
mode. To me that says 100 watts for 10 minutes and then RX for 10
minutes. Otherwise equal TX and RX times. Who does that?
And if one is running "100 watts" then running CW or SSB for 10 minutes
might be the limit. Just speculation. On AM I might talk for 10
minutes but that is at 25% rated power output for carrier, yet it is 100
watts PEP. The 60 C is MY guideline. The KPA3A will shut down about 85
C or so.
On 6M I run my KPA500 at about 300 to 400 watts. The K3S is running
about 25 to 30 watts on 6M. At this point I'm watching the KPA500
temperature.
There is NO DX worth blowing a PA either in the K3S or the KPA500.
But I know guys that will blow things up, pushing things to the max and
beyond trying to work that DX station. I say bah humbug to that!
I just pay attention to the PA temp, specially when running digital
modes. Likewise for the KPA500.
73
Bob, K4TAX
On 4/4/2020 3:41 PM, Frank O'Donnell wrote:
Thanks for the replies.
I've enabled the PA temp display (currently showing 22C right after
power-up but before transmitting), and will keep an eye on that.
Bob, I noticed that line in the K3S manual about the CW/SSB duty
cycle. Does "100% - 10 min, 100 W key-down" mean that if you key down
without stop in CW mode it can go 10 minutes at 100 watts? That seems
like an awful lot.
Where do the recommended TPO's for 6 meters, the 50% value for JT9,
and the 60C guideline for the PA temp come from?
Thanks again,
Frank K6FOD
On 4/4/20 6:22 AM, John Simmons wrote:
Fred Cady's book:
"There are four fans speeds that turn on at different temperatures."
"If the temperature reaches 84 degrees C the KPA3 will be bypassed
until the temperature falls to stop any damage as a last-ditch backup
measure to protect your expensive power transistors from the excess
heat."
-de John NI0K
Bob McGraw K4TAX wrote on 4/3/2020 6:39 PM:
Frank:
The duty cycle for the transmitter, as stated in the manual, is; CW
and SSB modes, 100% - 10 min, 100 W key-down at 25C ambient. Do
note that 6M has reduce power values of 85 watts {51 -52 MHz} or 70
watts {52 - 54 MHz}
The duty cycle for JT-9, 1 minute transmit, 1 minute receive would
be 50%. I frequently run 100 watts on WSJT-X FT-8 with no issues.
Just pay attention to PA temperature. It should be 60 C or less.
Also this is with FANS in the automatic mode.
73
Bob, K4TAX
On 4/3/2020 4:18 PM, Frank O'Donnell wrote:
I've been using JT9 mode on 630m this winter with my K3S outputting
to an external class D amp.
Now I'm interested in trying some JT9 QSOs with some people
currently operating on 160m. For me this would mean outputting
directly from the K3S (with internal tuner) to the antenna.
Given the 1-minute cycle time for JT9, are there recommendations
(official from Elecraft, or otherwise) on maximum power to use in a
situation like this? And/or, is the answer dependent on the SWR I
can achieve with the antenna?
Thanks and 73,
Frank K6FOD
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Re: [Elecraft] Max power for JT9 with K3S 100?
Running FT-8 or PSK-31, I see 60 C from time to time. Some bands I see the temp rise much faster indicating less efficiency. 73 Bob, K4TAX On 4/4/2020 5:03 PM, Dave Cole wrote: What is the recommended temp to run the KPA500 at? 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources On 4/4/20 3:01 PM, Andy Durbin wrote: "Does "100% - 10 min, 100 W key-down" mean that if you key down without stop in CW mode it can go 10 minutes at 100 watts? That seems like an awful lot." If you want to know what it actually means you'd probably have to run a test and record the PA temperature. Does it reach maximum value within that 10 minute period? If so, what is that maximum value and do you want to operate the finals at that temperature? If temperature does not reach a maximum then what is the rate of increase? At what time does the increasing temperature cross over the temperature at which you are willing to operate the finals? I record KPA500 temperatures for every transmission. Unfortunately Kenwood does not provide finals temperature on the serial bus so I have to make do with recording my TS-590S rear chassis temperature. Kenwood provided data shows TS-590S final temperature limited at about 85 deg C after 5 minutes and remained constant for remainder of the 2 hour 100 W key down test. (and no, I don't let mine get that hot) 73, Andy, k3wyc __ 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: http://www.qsl.net/donate.html Message delivered to d...@nk7z.net __ 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: http://www.qsl.net/donate.html Message delivered to rmcg...@blomand.net __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Max power for JT9 with K3S 100?
Andy et al; Just quoted what is in the K3S manual. No interpretation provided. I agree that 100 watts key down is a lot for a SSB amplifier running in CW mode. To me that says 100 watts for 10 minutes and then RX for 10 minutes. Otherwise equal TX and RX times. Who does that? I just pay attention to the PA temp when running digital modes. Likewise for the KPA500. 73 Bob, K4TAX On 4/4/2020 5:01 PM, Andy Durbin wrote: "Does "100% - 10 min, 100 W key-down" mean that if you key down without stop in CW mode it can go 10 minutes at 100 watts? That seems like an awful lot." If you want to know what it actually means you'd probably have to run a test and record the PA temperature. Does it reach maximum value within that 10 minute period? If so, what is that maximum value and do you want to operate the finals at that temperature? If temperature does not reach a maximum then what is the rate of increase? At what time does the increasing temperature cross over the temperature at which you are willing to operate the finals? I record KPA500 temperatures for every transmission. Unfortunately Kenwood does not provide finals temperature on the serial bus so I have to make do with recording my TS-590S rear chassis temperature. Kenwood provided data shows TS-590S final temperature limited at about 85 deg C after 5 minutes and remained constant for remainder of the 2 hour 100 W key down test. (and no, I don't let mine get that hot) 73, Andy, k3wyc __ 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: http://www.qsl.net/donate.html Message delivered to rmcg...@blomand.net __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] (Too much..) RF back and through the RX ANT OUT for external receiver
Hello, i ordered a Colibrì Nano USB SDR. and i am thinkg to connect the Colibrì antenna through the RX ANT OT of the K3s tu use the colibrì and his software like a panadapter for the K3s. The colibrì can't accept "IF OUT", so i will use RX ANT OUT from XV3B to give antenna signal to the Colibrì. But it seems, from some test i did with friends, that RX OUT is NOT well or totally disconnected weh K3s goes in TX and some RF goes (or come back) through the RX OUT. I would like to know if someone knows how many "dbm" or watt could goes through the RX OUT when the K3s is in TX with maximum power. Too much RF can kill the the SDR receiver. Anyone knows the answer ? Maybe Wayne or Eric ? ;-) Any help would be appreciated. Thanks a lot, Graziano IW2NOY __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Max power for JT9 with K3S 100?
What is the recommended temp to run the KPA500 at? 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources On 4/4/20 3:01 PM, Andy Durbin wrote: "Does "100% - 10 min, 100 W key-down" mean that if you key down without stop in CW mode it can go 10 minutes at 100 watts? That seems like an awful lot." If you want to know what it actually means you'd probably have to run a test and record the PA temperature. Does it reach maximum value within that 10 minute period? If so, what is that maximum value and do you want to operate the finals at that temperature? If temperature does not reach a maximum then what is the rate of increase? At what time does the increasing temperature cross over the temperature at which you are willing to operate the finals? I record KPA500 temperatures for every transmission. Unfortunately Kenwood does not provide finals temperature on the serial bus so I have to make do with recording my TS-590S rear chassis temperature. Kenwood provided data shows TS-590S final temperature limited at about 85 deg C after 5 minutes and remained constant for remainder of the 2 hour 100 W key down test. (and no, I don't let mine get that hot) 73, Andy, k3wyc __ 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: http://www.qsl.net/donate.html Message delivered to d...@nk7z.net __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Max power for JT9 with K3S 100?
"Does "100% - 10 min, 100 W key-down" mean that if you key down without stop in CW mode it can go 10 minutes at 100 watts? That seems like an awful lot." If you want to know what it actually means you'd probably have to run a test and record the PA temperature. Does it reach maximum value within that 10 minute period? If so, what is that maximum value and do you want to operate the finals at that temperature? If temperature does not reach a maximum then what is the rate of increase? At what time does the increasing temperature cross over the temperature at which you are willing to operate the finals? I record KPA500 temperatures for every transmission. Unfortunately Kenwood does not provide finals temperature on the serial bus so I have to make do with recording my TS-590S rear chassis temperature. Kenwood provided data shows TS-590S final temperature limited at about 85 deg C after 5 minutes and remained constant for remainder of the 2 hour 100 W key down test. (and no, I don't let mine get that hot) 73, Andy, k3wyc __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Max power for JT9 with K3S 100?
Thanks for the replies.
I've enabled the PA temp display (currently showing 22C right after
power-up but before transmitting), and will keep an eye on that.
Bob, I noticed that line in the K3S manual about the CW/SSB duty cycle.
Does "100% - 10 min, 100 W key-down" mean that if you key down without
stop in CW mode it can go 10 minutes at 100 watts? That seems like an
awful lot.
Where do the recommended TPO's for 6 meters, the 50% value for JT9, and
the 60C guideline for the PA temp come from?
Thanks again,
Frank K6FOD
On 4/4/20 6:22 AM, John Simmons wrote:
Fred Cady's book:
"There are four fans speeds that turn on at different temperatures."
"If the temperature reaches 84 degrees C the KPA3 will be bypassed
until the temperature falls to stop any damage as a last-ditch backup
measure to protect your expensive power transistors from the excess
heat."
-de John NI0K
Bob McGraw K4TAX wrote on 4/3/2020 6:39 PM:
Frank:
The duty cycle for the transmitter, as stated in the manual, is; CW
and SSB modes, 100% - 10 min, 100 W key-down at 25C ambient. Do
note that 6M has reduce power values of 85 watts {51 -52 MHz} or 70
watts {52 - 54 MHz}
The duty cycle for JT-9, 1 minute transmit, 1 minute receive would be
50%. I frequently run 100 watts on WSJT-X FT-8 with no issues.
Just pay attention to PA temperature. It should be 60 C or less.
Also this is with FANS in the automatic mode.
73
Bob, K4TAX
On 4/3/2020 4:18 PM, Frank O'Donnell wrote:
I've been using JT9 mode on 630m this winter with my K3S outputting
to an external class D amp.
Now I'm interested in trying some JT9 QSOs with some people
currently operating on 160m. For me this would mean outputting
directly from the K3S (with internal tuner) to the antenna.
Given the 1-minute cycle time for JT9, are there recommendations
(official from Elecraft, or otherwise) on maximum power to use in a
situation like this? And/or, is the answer dependent on the SWR I
can achieve with the antenna?
Thanks and 73,
Frank K6FOD
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Re: [Elecraft] K4 VHF module
Next Thursday. John AE5X https://ae5x.blogspot.com >Good evening >Quick Q - is there a rough ETA when the VHF module will be ready for the K4. >Thank you Ken WB8PKK __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Settings for SignaLink USB
You have the Signalink w/the module or the one w/jumpers? Several of my friends have had trouble w/the Signalink w/the module, I have two Signalinks, both w/jumpers and don’t have any issues. 73 de Jose Douglas KB1TCD Sent from my iPad > On Apr 4, 2020, at 4:21 AM, David Bondy wrote: > > I have been using digital modes for years and have a number of SignaLink USB > devices which have all worked very well with a variety of rigs. > > I am new to the K3 and have bought the Tigertronics cable and module set to > allow me to connect a SignaLink USB to the rear Line In/Out and PTT > connections on my K3. > > I am able to operate the rig (via a USB to RS232 cable for CAT) and transmit > JT8 signals (via the SignaLink) - I can see that I am getting out by > monitoring Hamspots! HOWEVER I am not able to get enough drive from the K3 > via the Signalink USB to decode incoming signals. > > Can someone who has this working please tell me what settings they have made > to the K3 in order to drive the SignaLink? I have set CONFIG > LIN OUT to > 100 and I have rotated the Rx knob to full clockwise on the SignaLink but I > am still not getting enough output to drive WSJT-X. I am sure that I am > missing something but I don’t know what because I would expect the LIN OUT > setting to be more like 10! > > Thanks in advance and 73, > > David G4NRT > > P.S. Please don’t bother to reply telling me to connect the rig to my PC > sound card … it doesn’t have one! > __ > 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: http://www.qsl.net/donate.html > Message delivered to kb1...@gmail.com __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] PX-3 wanted
Anyone have one available? Mike AI4NS __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Settings for SignaLink USB
David, I think you should check the jumpers in the SignaLink. Also make certain the level controls for the SL soundcard are set correctly in the computer. Or simply use another USB soundcard - the K33 has built-in isolation transformers. Set the K3 LIN OUT level to about 10. You apparently have a problem, but it may not be in the K3. Plug amplified computer speakers into the K3 LINE OUT jack as a test. You should hear the sounds. 73, Don W3FPR On 4/4/2020 4:20 AM, David Bondy wrote: I have been using digital modes for years and have a number of SignaLink USB devices which have all worked very well with a variety of rigs. I am new to the K3 and have bought the Tigertronics cable and module set to allow me to connect a SignaLink USB to the rear Line In/Out and PTT connections on my K3. I am able to operate the rig (via a USB to RS232 cable for CAT) and transmit JT8 signals (via the SignaLink) - I can see that I am getting out by monitoring Hamspots! HOWEVER I am not able to get enough drive from the K3 via the Signalink USB to decode incoming signals. __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Max power for JT9 with K3S 100?
Fred Cady's book:
"There are four fans speeds that turn on at different temperatures."
"If the temperature reaches 84 degrees C the KPA3 will be bypassed until
the temperature falls to stop any damage as a last-ditch backup measure
to protect your expensive power transistors from the excess heat."
-de John NI0K
Bob McGraw K4TAX wrote on 4/3/2020 6:39 PM:
Frank:
The duty cycle for the transmitter, as stated in the manual, is; CW
and SSB modes, 100% - 10 min, 100 W key-down at 25C ambient. Do note
that 6M has reduce power values of 85 watts {51 -52 MHz} or 70 watts
{52 - 54 MHz}
The duty cycle for JT-9, 1 minute transmit, 1 minute receive would be
50%. I frequently run 100 watts on WSJT-X FT-8 with no issues. Just
pay attention to PA temperature. It should be 60 C or less. Also
this is with FANS in the automatic mode.
73
Bob, K4TAX
On 4/3/2020 4:18 PM, Frank O'Donnell wrote:
I've been using JT9 mode on 630m this winter with my K3S outputting
to an external class D amp.
Now I'm interested in trying some JT9 QSOs with some people currently
operating on 160m. For me this would mean outputting directly from
the K3S (with internal tuner) to the antenna.
Given the 1-minute cycle time for JT9, are there recommendations
(official from Elecraft, or otherwise) on maximum power to use in a
situation like this? And/or, is the answer dependent on the SWR I can
achieve with the antenna?
Thanks and 73,
Frank K6FOD
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Re: [Elecraft] K4 VHF module
I suspect this item might be several months after they start shipping the radios. Dust off your “crystal ball”. Sent from my iPhone ...nr4c. bill > On Apr 3, 2020, at 11:38 PM, Ken B via Elecraft > wrote: > > Good evening > Quick Q - is there a rough ETA when the VHF module will be ready for the K4. > Thank you Ken WB8PKK > __ > 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: http://www.qsl.net/donate.html > Message delivered to n...@widomaker.com __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3 Settings for SignaLink USB
I ask “why use a SignaLink with the K3?” The K3 already has buffered Lin In and Line Out. Separate settings for in/out for each mode. The one item to pay attention to is transmit audio level. You should set the power out by using the Per knob on the K3 front panel. Then adjust the audio to show 4 solid bars and flashingbfifth bar on the ALC meter. Sent from my iPhone ...nr4c. bill > On Apr 4, 2020, at 4:22 AM, David Bondy wrote: > > I have been using digital modes for years and have a number of SignaLink USB > devices which have all worked very well with a variety of rigs. > > I am new to the K3 and have bought the Tigertronics cable and module set to > allow me to connect a SignaLink USB to the rear Line In/Out and PTT > connections on my K3. > > I am able to operate the rig (via a USB to RS232 cable for CAT) and transmit > JT8 signals (via the SignaLink) - I can see that I am getting out by > monitoring Hamspots! HOWEVER I am not able to get enough drive from the K3 > via the Signalink USB to decode incoming signals. > > Can someone who has this working please tell me what settings they have made > to the K3 in order to drive the SignaLink? I have set CONFIG > LIN OUT to > 100 and I have rotated the Rx knob to full clockwise on the SignaLink but I > am still not getting enough output to drive WSJT-X. I am sure that I am > missing something but I don’t know what because I would expect the LIN OUT > setting to be more like 10! > > Thanks in advance and 73, > > David G4NRT > > P.S. Please don’t bother to reply telling me to connect the rig to my PC > sound card … it doesn’t have one! > __ > 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: http://www.qsl.net/donate.html > Message delivered to n...@widomaker.com __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] K3 Settings for SignaLink USB
I have been using digital modes for years and have a number of SignaLink USB devices which have all worked very well with a variety of rigs. I am new to the K3 and have bought the Tigertronics cable and module set to allow me to connect a SignaLink USB to the rear Line In/Out and PTT connections on my K3. I am able to operate the rig (via a USB to RS232 cable for CAT) and transmit JT8 signals (via the SignaLink) - I can see that I am getting out by monitoring Hamspots! HOWEVER I am not able to get enough drive from the K3 via the Signalink USB to decode incoming signals. Can someone who has this working please tell me what settings they have made to the K3 in order to drive the SignaLink? I have set CONFIG > LIN OUT to 100 and I have rotated the Rx knob to full clockwise on the SignaLink but I am still not getting enough output to drive WSJT-X. I am sure that I am missing something but I don’t know what because I would expect the LIN OUT setting to be more like 10! Thanks in advance and 73, David G4NRT P.S. Please don’t bother to reply telling me to connect the rig to my PC sound card … it doesn’t have one! __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
