[ARC5] Dynamotor Regulation

[WA5CAB at cs.com]

I don't have any information on the PP-1104/G.  It may well have used 
copper oxide rectifiers.  I do have some information on the PP-1104A/G.  REF TM 
11-5126 and TM 11-6130-218-24P. It used humongous selenium rectifiers. And 
used a bunch (I forgot to count them) of 9000 ufd filter capacitors and some 
small inductance inductors in each of the two 12 V supplies.  The power 
transformer is the more conventional type with two 115 VAC primaries with taps 
for adjusting the output voltage and two 50 amp simple secondaries.  

The version that Mike describes is the PP-1104C/G.  I (also) own two of 
them.  The first was bought in 1992 out of Washington state, during an age when 
it was reasonably inexpensive to ship things like PP-1104's and BC-610's 
all the way across the country without having to take out a 2nd mortgage on 
your house.  The spare (acquired about 17 years later) either my or K5JV's 
trailer hauled back to Houston.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 07/29/2017 16:58:00 PM Central Daylight Time, 
aaf-radio-1 at aafradio.org writes: 
> Amen!  They're rated at 50 amps @28v, or 100 amps @14v continuous, but 
> mine have never failed to start the largest dynamotor I've ever need to power 
> up, including a big three phase 100 amp input rating 400Hz aircraft 
> inverter that turned out to be a real screamer.  I think I lost some hearing in 
> that test even though it was unloaded.  (I decided I did not need that in 
> the radio shack for obvious reasons...)  
> 
> The 1104's use of a saturable core reactor with a magnetic amplifier 
> configuration eliminates all the crowbar problems encountered with later 
> regulated solid state supplies.  It just grunts softly and carries the load.  The 
> original -A model actually used copper oxide rectifiers - that's how far 
> back the technology goes.  The last (-C) model uses ten 30 amp IN3660 diodes 
> to divide up the load to separate windings on the power transformer.  It's 
> pretty much bullet-proof.
>  
> Against my better judgement, I recently purchased another one on ebay - 
> mostly because it was nearby and I could pick it up for a couple gallons of 
> gas.  Shipping for its 151 pound weight is fairly prohibitive these days.
> 
> - Mike  KC4TOS
> 
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