Re: [Elecraft] KPA1500 S/N 160 delivered today

2018-05-19 Thread Bill Stravinsky via Elecraft 
 Larry
The zero just means that the fans are off (manually).  You can set the fans to 
be on at speeds 1 through 5 regardless of temp.  They will stay on 
continually.That said, the fans will operate automatically according to temp.  
They will ramp up as the temp increases.  I think the first to engage is the 
center fan but youcan easily see this yourself.  I did some CQing in the King 
of Spain contest to get the temp up and test things out.  They indeed came on 
at 60C.  I forgetwhere I stopped, I think at 71C, but the fans will come on 
starting at 60C with the fan speed on zero.
I  will give it a more robust test this Wednesday during the cwts but that is 
only a one hour test.  During WPX at the end of the month I will probably set 
thefan speed to 2 to get more cooling power below 60C.  When the PF1 & PF2 
buttons become programmable I will probably set them to turn the fans on or 
off.For me a fan speed of 2 is acceptable during a major contest situation even 
with headphones off which I really never do normally.

I did find it interesting tonight to see my shack tv get blanked out on xmit.  
I only checked 3 bands.  TV was ok on 80mtrs but blanked the picture and 
soundout on 20 & 40 mtrs, hi.  That never happened with either of my tube amps. 
 I will look into that at a later date.
Good luck with your amp.
BillK3WJV
p.s.  The pwr supply fans run whenever you turn the amp on but fans set at zero 
no amp fans should be on until 60C.

On Friday, May 18, 2018, 6:07:03 PM EDT, Larry (K8UT) <k...@charter.net> 
wrote:  
 
 Bill,

My KPA1500 also defaulted to FAN SPEED MIN = 0, but that is not fans off 
(at least not on my amplifier).

My fans engage at 60c (low), 65c (medium) and 70c (egads).

Is there a menu explanation somewhere about the start/stop temps and 
speeds? I would like a little more hysteresis in the 60c setting: start 
at 60c but continue cooling until temp drops to 50c. That might work a 
little better when running digital modes with long Tx/Rx intervals.

-larry (K8UT)

-- Original Message --
From: "Bill Stravinsky via Elecraft" <elecraft@mailman.qth.net>
To: "Elecraft Reflector" <elecraft@mailman.qth.net>
Sent: 2018-05-18 15:41:49
Subject: Re: [Elecraft] KPA1500 S/N 160 delivered today

>After having played with mine extensively last night, I was under the 
>impression that the fans would come on automatically when the temp 
>reached a certain degree.That is not the case. Mine was defaulted at 
>fan speed zero, which is fans off. You have to change the menu item for 
>fans to one of your liking. I had read a few postshere on the reflector 
>about 2 being an acceptable number. I agree.
>If you crank it up to max (5) you might scare the dog, be careful, hi.
>BillK3WJV
>
>On Tuesday, May 15, 2018, 5:59:02 PM EDT, Roy Koeppe <k...@ncn.net> 
>wrote:
>
>Works perfectly so far. The fans have never come on during my testing
>periods, including at full power. Power supply fans under the table are
>quiet. Really like! Low drive power. Was ordered 8-25-17 at 0900 CA 
>time.
>
>73, Roy K6XK
>
>
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Re: [Elecraft] KPA1500 S/N 160 delivered today

2018-05-19 Thread Bill Stravinsky via Elecraft 
 I can only give you a half a "duh".  The preliminary manual supplied with the 
amp only gives you the menu description of fan speed and it doesn't really 
describe the operation.The paragraph in the online manual labelled "Amplifier 
Cooling" is NOT in that preliminary manual.  The half a duh is for the first 
line of the menu description of "fan speed min".It says the speed varies per 
temp but after that sentence there is not much of a description.  It then says 
greater than zero all the way up to all fans running, leaving you in the dark.  
It doesn't explain it like you or Roy explained it.
I really figured it would work like you explained but unless you read the 
online manual you are missing the amplifier cooling paragraph.  Thanks to you 
and Roy for clearing thisup for me.
BillK3WJV



On Friday, May 18, 2018, 7:59:34 PM EDT, Bob McGraw K4TAX 
 wrote:  
 
 Bill:

Per the manual if Fan Speed is set to 0 which is the default, the fans 
are not on until needed.  The values of 1, 2, 3 etc will cause the fans 
to run at the selected minimum speed all of the time, but the fans will 
increment to a higher speed as called for by the internal heat sink 
temperature.    If you use 0 the fans will be off until needed.   This 
is not related to the fans in the power supply.

73

Bob, K4TAX



On 5/18/2018 2:41 PM, Bill Stravinsky via Elecraft wrote:
> After having played with mine extensively last night, I was under the 
> impression that the fans would come on automatically when the temp reached a 
> certain degree.That is not the case.  Mine was defaulted at fan speed zero, 
> which is fans off.  You have to change the menu item for fans to one of your 
> liking.  I had read a few postshere on the reflector about 2 being an 
> acceptable number.  I agree.
> If you crank it up to max (5) you might scare the dog, be careful, hi.
> BillK3WJV


  
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Re: [Elecraft] KPA1500 S/N 160 delivered today

2018-05-18 Thread Larry (K8UT) 

Bill,

My KPA1500 also defaulted to FAN SPEED MIN = 0, but that is not fans off 
(at least not on my amplifier).


My fans engage at 60c (low), 65c (medium) and 70c (egads).

Is there a menu explanation somewhere about the start/stop temps and 
speeds? I would like a little more hysteresis in the 60c setting: start 
at 60c but continue cooling until temp drops to 50c. That might work a 
little better when running digital modes with long Tx/Rx intervals.


-larry (K8UT)

-- Original Message --
From: "Bill Stravinsky via Elecraft" <elecraft@mailman.qth.net>
To: "Elecraft Reflector" <elecraft@mailman.qth.net>
Sent: 2018-05-18 15:41:49
Subject: Re: [Elecraft] KPA1500 S/N 160 delivered today

After having played with mine extensively last night, I was under the 
impression that the fans would come on automatically when the temp 
reached a certain degree.That is not the case. Mine was defaulted at 
fan speed zero, which is fans off. You have to change the menu item for 
fans to one of your liking. I had read a few postshere on the reflector 
about 2 being an acceptable number. I agree.

If you crank it up to max (5) you might scare the dog, be careful, hi.
BillK3WJV

On Tuesday, May 15, 2018, 5:59:02 PM EDT, Roy Koeppe <k...@ncn.net> 
wrote:


Works perfectly so far. The fans have never come on during my testing
periods, including at full power. Power supply fans under the table are
quiet. Really like! Low drive power. Was ordered 8-25-17 at 0900 CA 
time.


73, Roy K6XK


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Re: [Elecraft] KPA1500 S/N 160 delivered today

2018-05-18 Thread Roy Koeppe 
Bill, default setting is fan "0" -- then they remain off until needed as amp 
heats up with use. All automatically. So you hear no noise while you're just 
listening to receiver, etc.


RoyK6XKIowa

After having played with mine extensively last night, I was under the 
impression that the fans would come on automatically when the temp reached a 
certain degree.That is not the case.  Mine was defaulted at fan speed zero, 
which is fans off.  You have to change the menu item for fans to one of your 
liking.  I had read a few postshere on the reflector about 2 being an 
acceptable number.  I agree.

If you crank it up to max (5) you might scare the dog, be careful, hi.
BillK3WJV

   On Tuesday, May 15, 2018, 5:59:02 PM EDT, Roy Koeppe  
wrote:


Works perfectly so far. The fans have never come on during my testing
periods, including at full power. Power supply fans under the table are
quiet. Really like! Low drive power. Was ordered 8-25-17 at 0900 CA time.

73,  Roy  K6XK



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Re: [Elecraft] KPA1500 S/N 160 delivered today

2018-05-18 Thread Bill Stravinsky via Elecraft 
 After having played with mine extensively last night, I was under the 
impression that the fans would come on automatically when the temp reached a 
certain degree.That is not the case.  Mine was defaulted at fan speed zero, 
which is fans off.  You have to change the menu item for fans to one of your 
liking.  I had read a few postshere on the reflector about 2 being an 
acceptable number.  I agree.
If you crank it up to max (5) you might scare the dog, be careful, hi.
BillK3WJV

On Tuesday, May 15, 2018, 5:59:02 PM EDT, Roy Koeppe  wrote:  
 
 Works perfectly so far. The fans have never come on during my testing 
periods, including at full power. Power supply fans under the table are 
quiet. Really like! Low drive power. Was ordered 8-25-17 at 0900 CA time.

73,  Roy  K6XK 


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[Elecraft] KPA1500 S/N 160 delivered today

2018-05-15 Thread Roy Koeppe 
Works perfectly so far. The fans have never come on during my testing 
periods, including at full power. Power supply fans under the table are 
quiet. Really like! Low drive power. Was ordered 8-25-17 at 0900 CA time.


73,   Roy   K6XK 



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