[Milsurplus] [MMRCG] TCS Receiver on High Voltage DC-DC Brick

[Robert Nickels]

On 3/6/2019 1:55 PM, David Stinson wrote:
> Downside:
> RF noisy, so it must be shielded with filtered leads in/out.

Yup.  But they do work well otherwise.  Got bit by a new and different 
problem in a recent project, using them to run a little light a/c 
receiver which as it turns out has a 75kHz IF.  Guess what the switching 
frequency of the DC-DC converter is :-)   And of course light aircraft 
receivers have aluminum housings, so physical separation as well as 
shielding was required.

We typically think about EMI on the output but these things will also 
cause conducted EMI on the DC power input wires.   If all you're running 
is filaments that may be less of a problem, but additional isolation and 
filtering was required to power a solid state converter in my last 
project as the boost converter made real nasty spikes on the 12 volt buss.

Also B-  vs  ground isolation as Al mentioned.      They're good 
problem-solvers but definitely not plug-and-play.   Good practice at 
EMI/RFI mitigation however ;-)

For small amounts of HV (5 watts or so),  the nixie power supplies sold 
on eBay are also useful.  Some (more expensive) SMT versions are very 
tiny.    Same caveats apply.

73, Bob W9RAN