[ARC5] High current 28VDC power supply?

[Brian Clarke]

Hello Adam,
The installation manual for Command sets says to allow 100 A start-up
current for the transmitter + modulator combination. The recommended
LT cable is more than 3 mm diameter. Some cables I have pulled from
Command aircraft installations have been closer to 6 mm diameter to
the radio DC distribution box. The 25 A SMPSU will fall over.
73 de Brian VK2GCE
BE, MBA, PhD, CPEng, APEC Engineer, IntPE(Aus),
 FIEAust

----- Original Message -----
From:
 "Adam Castellani" <adamcastellani at yahoo.com>

To:
<arc5 at mailman.qth.net>
Cc:

Sent:
Wed, 28 Dec 2022 17:31:53 +0000
Subject:
[ARC5] High current 28VDC power supply?

 Hope the experienced and bright minds here might add their views on
the suitability of this unit [1], a 600 watt, 25 amp switcher
adjustable from 21.6 to 27.6 volts for command and liaison set use. 

1) Do you think 25 amps will be enough to power both a DM-33 and
single DM-32 simultaneously as part of a complete SCR-274-N? (actually
the transmitter portion is SCR and the receiver portion and modulator
are ARA ATA)

2) How about starting a PE-73 dynamotor to power a BC-375?

3) Could the 25 amp unit simultaneously power a BC-375 and BC-348 as
part of a complete SCR-287? 

4) Would it have a hope of powering both an SCR-287 and an SCR-274-N
at the same time?

In addition to the PP-1104-C units, which I wish were available in the
UK, are there other ready built PSUs worth considering? 

The 25 amp models are available. Unfortunately, the next size up
[2] which is 1000 watts, 42 amps adjustable from 20.4 to 28.8 volts
is on back order for a year. 

Thank you for your views and help. Photographs of these two projects
are here [3], here [4], here [5] and here [6]. 

Merry Christmas and Happy New Year,
Adam

*link from
above: https://uk.farnell.com/tdk-lambda/rws-600b-24/ac-dc-conv-1-o-p-24v-25a-600w/dp/2444011?st=600%20watt
[7]

**25 amp data sheet: https://www.farnell.com/datasheets/2883301.pdf
[8]

***42 amp data sheet: https://www.farnell.com/datasheets/3651152.pdf
[9]

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Links:
------
[1]
https://uk.farnell.com/tdk-lambda/rws-600b-24/ac-dc-conv-1-o-p-24v-25a-600w/dp/2444011?st=600%20watt
[2] https://www.farnell.com/datasheets/3651152.pdf
[3] https://i.imgur.com/Tfeb5vg.jpg
[4] https://i.imgur.com/Bo124sl.jpg
[5] https://i.imgur.com/rLCeL3M.jpg
[6] https://i.imgur.com/95VhA7U.jpg
[7]
https://uk.farnell.com/tdk-lambda/rws-600b-24/ac-dc-conv-1-o-p-24v-25a-600w/dp/2444011?st=600%20watt
[8] https://www.farnell.com/datasheets/2883301.pdf
[9] https://www.farnell.com/datasheets/3651152.pdf

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