[ARC5] Quieting A DC/DC Converter

[millerke6f at aol.com]

I bought a couple of the little DC/DC units noted by Dave Stinson.  One arrived without the HV diode installed, the second unit does work but I noted that the output has a 8 Volt P to P sawtooth waveform  on the top of the DC at around 8-11 Hz.  Test was unloaded and will see what happens with a load and perhaps a small post filter cap.  Will also do a spectrum test with my HP Selective VM to test for higher frequency products.  Great value if you can clean up the DC signal.


Bob  KE6F



-----Original Message-----
From: David Stinson <arc5 at ix.netcom.com>
To: 'ARC-5' <arc5 at mailman.qth.net>; milsurplus <milsurplus at mailman.qth.net>
Sent: Sat, Jan 27, 2018 9:41 am
Subject: Re: [ARC5] Quieting A DC/DC Converter


Needed a 140V supply for the AR8 receiver, so put
one of these DC/DC things in a very expensive box.
Line filters in and out.  Don't have the
feed-through caps yet so some birdies leaking by,
but ferrites on the leads knocked them way down.
Clean on MF and 160-75-40, some light hash above
about 15 MC.  We'll see how it goes with the
feedthrus.
73 Dave S.


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