[Elecraft] Linear PS Recommendations

[Clay Autery]

Thanks Jim!

Yes, eventually there will be quite a collection of gear.  My #1 Elmer
showed up at my door and surprised me with a NICE RS-35M to get me off
that SMPS.  It is super quiet.

I haven't opened it up yet, but I know (from one of your papers) what to
look for.  And I suspect my Elmer has already gone over this unit with a
fine-toothed comb.  He's an old Motorola and Air Force comms tech.

Eventually, I DO plan to power the entire shack from batteries and am
considering modifying linear supplies to provide the DC to the charger
controller(s).

I will probably use the PWRGate as an interim solution as per Kevin's
reiterated "OK" via email today...

Have a lot on my plate to complete before I get to that...  Just got a
"new" (to me) HP 5335A today, so I need to back up and cal the radio
while I wait on the rest of the sub-panel project parts to arrive.

And I am cooperating with Elecraft (and hopefully Powerwerx) to figure
out how to mitigate the problems with the switcher supply.

(Sounds like reverse current through the regulator circuit.... almost
smoked my fan controller because I almost forgot to protect against this
when switching to the 12VDC input from the 13.8VDC input...


73,

______________________
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389

On 7/21/2016 1:10 AM, Jim Brown wrote:
> On Wed,7/20/10:52 PM, Bob Nielsen wrote:
>> you probably don't need much more than 20 amp capability. I have used
>> an Astron RS-20 for the past 35 years but I would probably go for the
>> RS-35 or RS-50 if I was getting another one. 
>
> That depends on what gear other than the radio that you want to run
> from it, and whether it is charging a battery which runs the gear or
> the supply is running the gear directly. It's easy for other 12V gear
> in a shack to add several amps to the load, and the fancier the shack
> gets, the more that increases. Clay said he wanted to run all his gear
> from it (but not the KPA, I am assuming, because it's 120/240V
> powered). The gear I saw included computer monitors, a K-Line, and
> some accessories. Perhaps there will someday be antenna relays. And so
> on.
>
> Also, the numbers in Astron's model names do NOT correspond to steady
> state load capacity. It's important to study the data sheets. They are
> generally well regarded for reliability, but every one I've opened had
> a bonding problem which is important, but easy to fix.
>
> Another important characteristic of Astron supplies is that their
> output regulator circuit is likely to fry if connected to charge a
> battery but the supply is not powered. Like in a power failure. Ask me
> how I know this. :) Astron sells a module to place between the supply
> and the battery to solve this problem.
>
> 73, Jim K9YC
>
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