Just measured my SS-25 using my Fluke 77. Measured at the power supply
terminals.
14.10 volts with 1.0 amp load (radio receive)
14.01 volts with a 17.5 amp load (radio 110 watts carrier)
I find a change of 0.09 volts to be acceptable for the load applied.
73
Bob, K4TAX
On 9/24/2024 9:18 AM, elecraft-requ...@mailman.qth.net wrote:
Message: 3
Date: Fri, 20 Sep 2024 17:20:36 +0000
From: Michael Carter<mike.car...@unh.edu>
To: Elecraft Reflector Reflector<Elecraft@mailman.qth.net>
Subject: [Elecraft] OT: regulation quality of Astron SS-25 power
supply?
Message-ID:
<bl3p223mb03857f4d4f6afb4a36471215e4...@bl3p223mb0385.namp223.prod.outlook.com>
Content-Type: text/plain; charset="iso-8859-1"
I've been using the SS-25 as the supply for my K3 or K2/100 for several years.
I've been curious about how much voltage drop I see in the stock DC power cable
that came with the K3 as a function of supply current. No DC power
distribution blocks here - just straight cable from K3 PowerPoles to terminals
on the power supply rear apron.
Today I did careful measurements of the internal voltage reported by the K3,
the voltage directly at the SS-25 DC terminals (measured with Fluke 115 DMM),
and the total current reported by the K3 for different TX power control
settings.
The no-load voltage ** directly measured** at the SS-25 was 13.78 V, with 2.0
W TX power setting it dropped to 13.76 V (2.22 A current), and at 90 W TX power
setting (17.4 A current) it dropped to 13.47 V. These voltages are all
measured AT the power supply terminals, not the voltages reported by the K3's
internal monitor.
My rough calculation indicates a 2% decrease in power supply terminal voltage
for an approximate 15 A increase in load current. This seems like poor
regulation to me, and I can't find any specification for voltage regulation
quality on the web or at Astron's official page.
Has anyone done a careful measurement of regulation for this SMPS?
Thanks, and 73,
Mike, K8CN
--
You don’t get to choose how you’re going to die or when. You can only
decide how you’re going to live now. Joan Baez
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