[Elecraft] Tripp Lite Power Supply

[Sandy W5TVW]

The Astron's I have are the old pass transistor type series regulator supplies.
They both use a VERY sensitive crowbar circuit for protection.  You can
eliminate a lot of the grief by adding bypassing. (7 and 35 amp ones)
We used "Tripp Lite" supplies a few times in commercial application
on marine communication gear.  They all gave us nothing but grief
and were very troublesome!  We had excellent results with Astron
(except in some cases with 100 watt plus SSB gear) and the best we
used was supplies made by Newmar Electronics.  It was EXTREMELY
rare to EVER have ANY trouble with the Newmars!
I even had a Tripp-Lite UPS for my computer once and it also wasn't
worth a damn.  My son used several Tripp-Lite UPS units and they
ALL failed!
My 2 pennie's worth!
73,
Sandy W5TVW 
----- Original Message ----- 
From: <bprats at telis.org>
To: "'Steve & Anne Ray'" <sbralr at cox.net>; "'Elecraft'" <elecraft at mailman.qth.net>
Sent: Tuesday, May 18, 2004 2:29 PM
Subject: RE: [Elecraft] Tripp Lite Power Supply


| The first thing that comes to mind is switching frequency and EMI filtering.
| I'm sure that Astron is a switching power supply, however, since my Tripp
| Lite PR7B is not a switcher power supply but an analog power supply and
| similar to your PR10bTripp Lite, there is the answer. Also, check the Tripp
| Lite web site for these models.
| 
| The Astron produces DC output in part by rapidly turning the 115 VAC input
| into chopped up DC voltage, maybe 12 to 15 volts,  then passes this current
| through a filter to clean up the spikes (AC and EMI(maybe)) on the way to
| the output.  The chopping is controlled by an oscillator, sort of, and of
| course, there is a slight emission from these actions. The oscillator is
| also part of the voltage regulation functions. Notice how light the Astron
| weighs, no big transformer, light weight, compact, excellent regulation but
| it could have slight emissions or some noise on the DC.  Normally not.
| 
| The PR7B uses an old fashion analog circuit with a heavy transformer to
| convert 115VAC to a value around 20VAC (no chopping) then rectifies or
| removes the AC component to smooth the output into DC through solid state
| diodes and capacitors, no chopping, no hash, so it generates very clean
| output.  Of course, there is a voltage regulator to help maintain stable
| output.  The draw back is that it is large, heavy and gets warm.
| 
| Sorry about the layman terms. The explanation is just a quicky overview.
| 
| Bill K6ACJ
| 
| 
| 
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