[Elecraft] FW: How far can the KPA1500 amp be from the PS?

[kstover at ac0h.net]

Who said move the amp outside?
I said move the power run outside from the room where the panel is to the
room that needs it.

R. Kevin Stover    AC0H

ARRL, FISTS, SKCC, NAQCC.
One of the guys that made sneakernet irrelevant, in my little corner of the
world.
"If it doesn't work the first time you push the button it won't work the
20th.Just stop."

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of Edward R Cole
Sent: Sunday, April 29, 2018 5:57 PM
To: Elecraft Reflector <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] FW: How far can the KPA1500 amp be from the PS?

I would agree.  If I invested >$5K in a shiny new piece of ham gear I would
not risk it to damage from moisture.  Besides, I would want to admire it
every time I sat down in the shack.

With that being said, I have a lot of equipment remotely located at tower
top or bottom.  Most of my operating is VHF/UHF/mw where RF cable losses can
be astronomical.  Everything at 900-MHz and up is remote in outside
enclosures (usually fiberglass).  NONE are air-tight and are open on bottom
for free air exchange.  I live in a coastal, sub-arctic climate which
guarantee's moist air.  Temperature changes will pull outside air into
sealed compartments which have no path to exhaust back outside.  Even if you
live in the desert, temperature pumping exists (less extremely a air is
drier).

I am currently in process of installing a 1000w 6m,1200w 2m, and 600w
1296 amplifiers at base of their respective antennas (towers).  All will
have cooling fans with exterior air exchange (typically drawing air thru
openings in bottom of enclosure and exhausted by fans thru separate vents
(shielded from water entry).

For HF, cable loss is insignificant if they are rated for QRO; keep it
inside, warm/cool and dry.

73, Ed

Rick N6XI, writes (edited):

I would advise against putting the amp
outdoors. Even if the housing is 100% water tight forever, Murphy almost
guarantees that the first failure that causes you to want to access the
amplifier will occur during a downpour or snow storm.


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

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