You will likely be in a 50 Hz country so consider reducing power to keep the
transformer happy AND bring a couple of muffin fans to help keep the RF and
PS sides happy.
Carl
KM1H
----- Original Message -----
From: "Jeff Kinzli N6GQ" <jeff@N6GQ.com>
To: "Alek Petkovic" <vk6apk@bigpond.com>
Cc: "amps" <amps@contesting.com>
Sent: Wednesday, April 16, 2014 5:45 PM
Subject: Re: [Amps] AL572 for DXpedition, parts to take along
True, and if the spare parts list gets to be the size/weight of
another amp, that might be the better option - at least then its a
quick swap, and any parts needed are there for the taking...
Although, in all reality, I have to assume that as a single-op, doing
much more than a tube swap in the middle of the contest is probably
not feasible, and much of these parts would only be in case the amp
fails pre-contest...
Believe me, I'm arguing myself in and out of all sorts of scenarios :)
73 de N6GQ
On Wed, Apr 16, 2014 at 2:41 PM, Alek Petkovic <vk6apk@bigpond.com> wrote:
Starting to sound like a spare amp. :-)
Alek. VK6APK
On 17/04/2014 5:30 AM, Joe Subich, W4TV wrote:
A full set of power supply caps and the equalizing resistors,
A spare set of rectifier diodes
(as an alternative - consider a complete power supply board)
spare set of parasitic suppressors
a spare metering board
The original T/R relay (in case f PIN diode failure).
73,
... Joe, W4TV
On 4/16/2014 5:11 PM, Jeff Kinzli N6GQ wrote:
Hi all...
I'm prepping for a trip to Africa and plan to take an AL572 (cheap,
light, dispensable, plentiful, and does about 1200w out). While I
realize there are better amp choices in terms of durability, etc. this
is the one I've chosen with the above factors in mind. It is going to
be the primary amp in an SO2R setup, and if it fails, I still have a
secondary pretty solid (Acom) amp I can put into primary. I'll also
have the QSK board installed. Over a week I'd expect to put about 150
hard hours on the amp.
So, if you were taking the AL572 with you to a place where parts are
non-existent, and wanted to have a chance of keeping the amp online in
100+F heat in a rugged duty cycle (fast CW, fast SSB) what would you
take? My plan is the following:
- spare set of tubes
- plate choke
- a couple spare HV caps for the PS
Are there other things that would be smart to take along? I'm thinking
along the lines of what's reasonable to both take along, and field
repair with - and while a spare set of tubes is marginal in that
sense, it seems to me that at least with 572Bs it might not be a bad
idea. Also any areas of the AL572 that are inherently weak?
Anything else? I'd also be interested in hearing about any other mods
folks would suggest to strengthen the amp for the long haul (I've seen
the W8JI mods).
Thanks,
Jeff N6GQ
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--
From sunny Binningup, Western Australia.
Family Businesses:
Petkovic Air& Gas. petkovicag@bigpond.com
SP Electrical. www.spelectrical.net.au
Hampers by Hand. www.facebook.com/hampersbyhand
http://www.qrz.com/db/vk6apk
http://www.qrz.com/db/vk6ap
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