Re: [Elecraft] Relocating my KPA-1500 - need cable

[rocketnj]

Running 1500 watts on 6 meters does get the fans going 😊

73
Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Julia Tuttle
Sent: Saturday, June 4, 2022 12:45 AM
To: j...@kk9a.com
Cc: Elecraft 
Subject: Re: [Elecraft] Relocating my KPA-1500 - need cable

Fan noise?

On Fri, Jun 3, 2022, 23:11  wrote:

> Why?
>
>
>
> w2irt.net wrote:
>
>  if it keeps the amp far away from the shack I'll be happy.and 
> so will the XYL .
>
>
>
> - pjd
>
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Re: [Elecraft] Relocating my KPA-1500 - need cable

[Julia Tuttle]

Fan noise?

On Fri, Jun 3, 2022, 23:11  wrote:

> Why?
>
>
>
> w2irt.net wrote:
>
>  if it keeps the amp far away from the shack I'll be happy.and so
> will
> the XYL .
>
>
>
> - pjd
>
> __
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> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to ju...@juliatuttle.net
>
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Re: [Elecraft] KPA1500 reduces power as it gets warmer?

[Rick NK7I]

Yes, the KPA1500 will drop 10% of the output, as it warms up. 1500 drops 
to 1350, so you have to compensate with the drive.


I'm told this is typical of all solid state finals (my KPA500 did likewise).

If you're running the station remotely; bump up the fan speed to slow 
the drop (or wear cans).


73,
Rick NK7I

On 6/3/2022 9:22 PM, David F. Reed wrote:

I note my KPA1500 drops power at its temperature rises...

Using FT8, so a relatively high duty cycle.

Say I start at a heat sink temperature of 27 C, and 1,000 watts out; 
by the time the temperature is at 65 C, the power has dropped to 893 
watts out.


I have a couple of questions about this (not a complaint by the way):

1. Does anyone else experience this?
2. Is it normal?


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[Elecraft] KPA1500 reduces power as it gets warmer?

[David F. Reed]

I note my KPA1500 drops power at its temperature rises...

Using FT8, so a relatively high duty cycle.

Say I start at a heat sink temperature of 27 C, and 1,000 watts out; by 
the time the temperature is at 65 C, the power has dropped to 893 watts out.


I have a couple of questions about this (not a complaint by the way):

1. Does anyone else experience this?
2. Is it normal?

--
Thanks & 73 de Dave, W5SV
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Re: [Elecraft] Relocating my KPA-1500 - need cable

[john]

Why?



w2irt.net wrote:

 if it keeps the amp far away from the shack I'll be happy.and so will
the XYL . 

 

- pjd

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Re: [Elecraft] Relocating my KPA-1500 - need cable

[Jim Brown]

On 6/3/2022 1:26 PM, li...@w2irt.net wrote:

Getting the molded plug downstairs will be a PITA, but I guess I can enlarge a 
couple of the ½” holes


Industrial electronics vendors like Arrow, Digikey, and Newark sell 
DE-DB connector inserts and shells, it should be possible to find cable 
with enough conductors from the same vendors. One caution -- don't go 
for the cheapest inserts -- the cheapies are hard to solder to and can 
melt with the heat.


73, Jim K9YC
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Re: [Elecraft] Relocating my KPA-1500 - need cable

[lists]

So I did a bit of measuring today. It looks like I only need somewhere around 
10 to 13 feet of DE15 extension. Digi-Key sells the 15’ version for $21 (plus 
shipping). A bit spendy, but if it keeps the amp far away from the shack I’ll 
be happy…and so will the XYL . Getting the molded plug downstairs will be 
a PITA, but I guess I can enlarge a couple of the ½” holes in the floor with a 
dremmel or something.

 

- pjd

 

From: Bob Wilson, N6TV  
Sent: Friday, June 3, 2022 3:23 AM
To: Peter W2IRT ; Elecraft Reflector 
Subject: Re: [Elecraft] Relocating my KPA-1500 - need cable

 

On Thu, Jun 2, 2022, 11:24 PM mailto:li...@w2irt.net> > wrote:

Just so I’m clear on the concept, you’re suggesting taking my existing AUX 
cable from the Y-box to the amp on the desk, and adding a DB-15 
straight-through extension to it, and connecting the far end of that extension 
into the relocated KPA-1500 in the basement, yes?

Yes, though it doesn't matter (electrically) which device connects with the 
Elecraft AUX cable.You could plug the extension into the Y-BOX and the AUX 
cable into the amp.  FYI, the correct term is DE15 (sometimes HD15 for High 
Density).  No such thing as DB15 or DB9 though, they are commonly misused. 

I can supply a 2.5' M/M cable from rig to Y-BOX if you need one.

[pjd] At the moment I have the Y-box plugged into the K3s, with one line going 
to the amp, and a second line sending band data to my Ameritron RCS-12 
automatic antenna switch controller at the base of the tower. 

The controller (band decoder box) is usually located in the shack, with the 
relay box outside.  That should be more reliable.

At the moment I have no plans to replace that, despite the fact it’s basically 
junk that doesn’t work automatically when the shack is below 65°F, which is the 
case all winter long! But I’m trying to see why I would need to change out the 
cable from the radio to the Y-box. Am I missing something?

If it's 5 ft long, that adds to the total length between K3 and AMP and RCS-12 
controller.  If you don't need 5 ft between rig and Y-BOX, replacing it with a 
2.5 ft cable will reduce the  the total length (and loss) by a little bit.  But 
it will probably won't make any difference.

 

73,

Bob, N6TV

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[Elecraft] KPA-1500 power supply cleaning

[Pete Smith N4ZR]

Yesterday, I finally took the cover off my KPA-1500 power supply, which 
has been sitting on the carpet behind my desk for 2 1/2 years.  I have a 
shedding dog and am not particularly fastidious, so I was worried about 
diminished cooling.  I needn't have worried - the interior of the supply 
looked just like new.  Now on to the RF deck, where I expect much more 
crud to have collected.


--
73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at .
For spots, please use your favorite
"retail" DX cluster.

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Re: [Elecraft] Relocating my KPA-1500 - need cable

[Bob Wilson, N6TV]

On Thu, Jun 2, 2022, 11:24 PM  wrote:

> *Just so I’m clear on the concept, you’re suggesting taking my existing
> AUX cable from the Y-box to the amp on the desk, and adding a DB-15
> straight-through extension to it, and connecting the far end of that
> extension into the relocated KPA-1500 in the basement, yes?*
>
Yes, though it doesn't matter (electrically) which device connects with the
Elecraft AUX cable.You could plug the extension into the Y-BOX and the
AUX cable into the amp.  FYI, the correct term is DE15 (sometimes HD15 for
High Density).  No such thing as DB15 or DB9 though, they are commonly
misused.

> I can supply a 2.5' M/M cable from rig to Y-BOX if you need one.
>
> *[pjd] At the moment I have the Y-box plugged into the K3s, with one line
> going to the amp, and a second line sending band data to my Ameritron
> RCS-12 automatic antenna switch controller at the base of the tower. *
>
The controller (band decoder box) is usually located in the shack, with the
relay box outside.  That should be more reliable.

>
>
> *At the moment I have no plans to replace that, despite the fact it’s
> basically junk that doesn’t work automatically when the shack is below
> 65°F, which is the case all winter long! But I’m trying to see why I would
> need to change out the cable from the radio to the Y-box. Am I missing
> something?*
>
If it's 5 ft long, that adds to the total length between K3 and AMP and
RCS-12 controller.  If you don't need 5 ft between rig and Y-BOX, replacing
it with a 2.5 ft cable will reduce the  the total length (and loss) by a
little bit.  But it will probably won't make any difference.

73,
Bob, N6TV
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