Re: [Elecraft] KPA500 max heat sink temp?

[Edward R Cole]

Not a burning need, but I could see buying a KPA500 some day.

I have the K3/10 and KX3 which are both 12w output and drive my 
KXPA100, nicely.  It has the KXAT100 tuner.


If I decided to have high power on HF that might also mean an upgrade 
in HF yagi (20-10m).  I have an aged Hygain TH3mk4 which needs the 
antenna tuner to match.  Its the old trap design so might opt for a 
SteppIR or a log-periodic, both of which need no tuning.  6-dBi gain 
would be adequate, non-contester or DXer on HF.


Side Note to 6m ops:  I am now monitoring 50.313 FT8, daily (with PSK 
Reporter enabled).


73, Ed - KL7UW
  http://www.kl7uw.com
Dubus-NA Business mail:
  dubus...@gmail.com 


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Re: [Elecraft] KPA500 max heat sink temp?

[Rick NK7I]

I have both.  I've had the KPA500 much longer of course and it's nice.  
Small, concise and quiet, perfect for closest stations (tight spaces).


Having the KAT500 (essentially) built into one package with the 1500 
watt amp (less cabling but one less antenna port too than the KAT500) 
with legal (US) limit is awesome, meaning full range from 0.1-1500 watts 
out (with overhead, not straining, don't ask ;-) oops).


Since I moved to strictly resonant antennas, the KPA1500 tuner is being 
used only as an antenna switch, the fan noise isn't awful (the 12V 60A 
power supply fan on the other hand... wow!), but since that 240V circuit 
isn't on the house generator, when the power goes out, it'll be a quick 
swap to put the KPA500/KAT500 back into play.  It's nice to have options.


With the KPA500, one must still use finesse, with the KPA1500, one 
shouts "Mongo hungry; feed Mongo!" (movie reference).  I strongly 
suspect that the KPA1500 will integrate so well into the K4 it'll simply 
be amazing, outstanding,  (I'll find out later 
this summer).


Each has it's place, if we ever get out of house arrest and back to 
having DXPeditions.  My logbook is beginning to sound like hungry 
Mongo...  band slots, while tasty, do not make a meal.


73,
Rick NK7I


On 7/8/2020 5:08 PM, Eric Norris wrote:
Actually, I have, Rick.  The KPA1500 is the second greatest amplifier 
in the history of the solar system.   It's a BattleBot, a monster, the 
doomsday legal-limit amplifier.  But the KPA500 is tiny, and so quiet 
that I can run it in the same room where the XYL watches TV.  My cat 
"Bubs" McLovin does not even stir from his dreams of taking down a 
Cape Buffalo when the KPA500 hits FAN3.


73 Eric WD6DBM

On Wed, Jul 8, 2020, 2:34 PM Rick Bates, NK7I > wrote:


Then you haven't used a KPA1500.

Rick NK7I


On 7/8/2020 2:11 PM, Eric Norris wrote:
> Thanks, Jack!  Now the only question is, is the KPA500 a great
amp, or the
> greatest amp ever?  I'm in the second camp.
>
> 73.5  Eric WD6DBM
>
> On Wed, Jul 8, 2020, 1:16 PM Jack Brindle mailto:jackbrin...@me.com>> wrote:
>
>> I can confirm that KPA500 V1.00 firmware, which was the first
released,
>> had a max temperature of 90 degrees C. This has not been
changed in any
>> subsequent code.
>>
>> As for the input power, the amplifier has improved over time.
My original
>> prototype KPA500 requires power in the range described (about
35 - 40
>> watts), while my new one (just over a year old) needs about 20
or so watts.
>> Both are great amps!
>>
>> 73!
>> Jack, W6FB
>>
>>
>>> On Jul 8, 2020, at 1:00 PM, William Hammond via Elecraft <
>> elecraft@mailman.qth.net > wrote:
>>> Hi Eric, My manual (revision B, 2011) that came with my SN
0149 says 90C
>> maximum, page14 in the specifications.  It also says drive
power 30-40
>> watts for 500 out and I have never beed even close to that,
usually 22-26
>> watts drive.
>>> FYI,
>>> Bill-AK5X
>>>
 On Jul 8, 2020, at 6:00 AM, Eric Norris
mailto:norrislawfi...@gmail.com>>
>> wrote:
 I just read in the current KPA500 Manual that max heat sink
temp is 90C.
 Is this true for my first-year production KPA500?  I seem to
remember
 somethink like 75C.  I cant find my old manual.

 73 Eric WD6DBM
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Re: [Elecraft] KPA500 max heat sink temp?

[Eric Norris]

Actually, I have, Rick.  The KPA1500 is the second greatest amplifier in
the history of the solar system.   It's a BattleBot, a monster, the
doomsday legal-limit amplifier.  But the KPA500 is tiny, and so quiet that
I can run it in the same room where the XYL watches TV.  My cat "Bubs"
McLovin does not even stir from his dreams of taking down a Cape Buffalo
when the KPA500 hits FAN3.

73 Eric WD6DBM

On Wed, Jul 8, 2020, 2:34 PM Rick Bates, NK7I  wrote:

> Then you haven't used a KPA1500.
>
> Rick NK7I
>
>
> On 7/8/2020 2:11 PM, Eric Norris wrote:
> > Thanks, Jack!  Now the only question is, is the KPA500 a great amp, or
> the
> > greatest amp ever?  I'm in the second camp.
> >
> > 73.5  Eric WD6DBM
> >
> > On Wed, Jul 8, 2020, 1:16 PM Jack Brindle  wrote:
> >
> >> I can confirm that KPA500 V1.00 firmware, which was the first released,
> >> had a max temperature of 90 degrees C. This has not been changed in any
> >> subsequent code.
> >>
> >> As for the input power, the amplifier has improved over time. My
> original
> >> prototype KPA500 requires power in the range described (about 35 - 40
> >> watts), while my new one (just over a year old) needs about 20 or so
> watts.
> >> Both are great amps!
> >>
> >> 73!
> >> Jack, W6FB
> >>
> >>
> >>> On Jul 8, 2020, at 1:00 PM, William Hammond via Elecraft <
> >> elecraft@mailman.qth.net> wrote:
> >>> Hi Eric, My manual (revision B, 2011) that came with my SN 0149 says
> 90C
> >> maximum, page14 in the specifications.  It also says drive power 30-40
> >> watts for 500 out and I have never beed even close to that, usually
> 22-26
> >> watts drive.
> >>> FYI,
> >>> Bill-AK5X
> >>>
>  On Jul 8, 2020, at 6:00 AM, Eric Norris 
> >> wrote:
>  I just read in the current KPA500 Manual that max heat sink temp is
> 90C.
>  Is this true for my first-year production KPA500?  I seem to remember
>  somethink like 75C.  I cant find my old manual.
> 
>  73 Eric WD6DBM
>  __
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> >>
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Re: [Elecraft] KPA500 max heat sink temp?

[Rick Bates, NK7I]

Then you haven't used a KPA1500.

Rick NK7I


On 7/8/2020 2:11 PM, Eric Norris wrote:

Thanks, Jack!  Now the only question is, is the KPA500 a great amp, or the
greatest amp ever?  I'm in the second camp.

73.5  Eric WD6DBM

On Wed, Jul 8, 2020, 1:16 PM Jack Brindle  wrote:


I can confirm that KPA500 V1.00 firmware, which was the first released,
had a max temperature of 90 degrees C. This has not been changed in any
subsequent code.

As for the input power, the amplifier has improved over time. My original
prototype KPA500 requires power in the range described (about 35 - 40
watts), while my new one (just over a year old) needs about 20 or so watts.
Both are great amps!

73!
Jack, W6FB



On Jul 8, 2020, at 1:00 PM, William Hammond via Elecraft <

elecraft@mailman.qth.net> wrote:

Hi Eric, My manual (revision B, 2011) that came with my SN 0149 says 90C

maximum, page14 in the specifications.  It also says drive power 30-40
watts for 500 out and I have never beed even close to that, usually 22-26
watts drive.

FYI,
Bill-AK5X


On Jul 8, 2020, at 6:00 AM, Eric Norris 

wrote:

I just read in the current KPA500 Manual that max heat sink temp is 90C.
Is this true for my first-year production KPA500?  I seem to remember
somethink like 75C.  I cant find my old manual.

73 Eric WD6DBM
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Re: [Elecraft] KPA500 max heat sink temp?

[Eric Norris]

Thanks, Jack!  Now the only question is, is the KPA500 a great amp, or the
greatest amp ever?  I'm in the second camp.

73.5  Eric WD6DBM

On Wed, Jul 8, 2020, 1:16 PM Jack Brindle  wrote:

> I can confirm that KPA500 V1.00 firmware, which was the first released,
> had a max temperature of 90 degrees C. This has not been changed in any
> subsequent code.
>
> As for the input power, the amplifier has improved over time. My original
> prototype KPA500 requires power in the range described (about 35 - 40
> watts), while my new one (just over a year old) needs about 20 or so watts.
> Both are great amps!
>
> 73!
> Jack, W6FB
>
>
> > On Jul 8, 2020, at 1:00 PM, William Hammond via Elecraft <
> elecraft@mailman.qth.net> wrote:
> >
> > Hi Eric, My manual (revision B, 2011) that came with my SN 0149 says 90C
> maximum, page14 in the specifications.  It also says drive power 30-40
> watts for 500 out and I have never beed even close to that, usually 22-26
> watts drive.
> >
> > FYI,
> > Bill-AK5X
> >
> >> On Jul 8, 2020, at 6:00 AM, Eric Norris 
> wrote:
> >>
> >> I just read in the current KPA500 Manual that max heat sink temp is 90C.
> >> Is this true for my first-year production KPA500?  I seem to remember
> >> somethink like 75C.  I cant find my old manual.
> >>
> >> 73 Eric WD6DBM
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Re: [Elecraft] KPA500 max heat sink temp?

[Jack Brindle via Elecraft]

I can confirm that KPA500 V1.00 firmware, which was the first released, had a 
max temperature of 90 degrees C. This has not been changed in any subsequent 
code.

As for the input power, the amplifier has improved over time. My original 
prototype KPA500 requires power in the range described (about 35 - 40 watts), 
while my new one (just over a year old) needs about 20 or so watts. Both are 
great amps!

73!
Jack, W6FB


> On Jul 8, 2020, at 1:00 PM, William Hammond via Elecraft 
>  wrote:
> 
> Hi Eric, My manual (revision B, 2011) that came with my SN 0149 says 90C 
> maximum, page14 in the specifications.  It also says drive power 30-40 watts 
> for 500 out and I have never beed even close to that, usually 22-26 watts 
> drive.  
> 
> FYI,
> Bill-AK5X
> 
>> On Jul 8, 2020, at 6:00 AM, Eric Norris  wrote:
>> 
>> I just read in the current KPA500 Manual that max heat sink temp is 90C.
>> Is this true for my first-year production KPA500?  I seem to remember
>> somethink like 75C.  I cant find my old manual.
>> 
>> 73 Eric WD6DBM
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Re: [Elecraft] KPA500 max heat sink temp?

[William Hammond via Elecraft]

Hi Eric, My manual (revision B, 2011) that came with my SN 0149 says 90C 
maximum, page14 in the specifications.  It also says drive power 30-40 watts 
for 500 out and I have never beed even close to that, usually 22-26 watts 
drive.  

FYI,
Bill-AK5X

> On Jul 8, 2020, at 6:00 AM, Eric Norris  wrote:
> 
> I just read in the current KPA500 Manual that max heat sink temp is 90C.
> Is this true for my first-year production KPA500?  I seem to remember
> somethink like 75C.  I cant find my old manual.
> 
> 73 Eric WD6DBM
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[Elecraft] KPA500 max heat sink temp?

[Eric Norris]

I just read in the current KPA500 Manual that max heat sink temp is 90C.
Is this true for my first-year production KPA500?  I seem to remember
somethink like 75C.  I cant find my old manual.

73 Eric WD6DBM
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