[ale] [EXTERNAL] Re: Any ham radio operators among us? Linux in the shack?

[Allen Beddingfield]

Sounds like you've got quite the nice setup going!  I'm just getting into HF, using a borrowed IC-735, and a hamstick dipole, alongside my Kenwood TM-281A mobile that I'm using as a 2M rig at  home.
I'm going to start adding in ferrite chokes, and plan to replace that PS.  In the meantime, that PC will stay powered down when I'm trying to do anything on the air.
Allen B./KO4OJA

--
Allen Beddingfield
Systems Engineer
Office of Information Technology
The University of Alabama
Office 205-348-2251
allen at ua.edu


________________________________________
From: Ale <ale-bounces at ale.org> on behalf of Alex Carver via Ale <ale at ale.org>
Sent: Monday, October 18, 2021 3:45 AM
To: ale at ale.org
Cc: Alex Carver
Subject: [EXTERNAL] Re: [ale] Any ham radio operators among us? Linux in the shack?



I've got loads of both linear and switching power supplies in and around
the desk but I spent lots of time putting chokes on everything to keep
it clean.  I also usually spend a bit more on the supplies.  Most of my
switchers are DIN-rail mount units or similar industrial units that have
filters in them and don't radiate much because they're intended to be in
close proximity to other sensitive devices like PLCs.  Nearly everything
at my desk that used to have a 5V wall wart is now sharing one of three
5V/10A DIN rail units. I have an enclosure at the end of the desk with a
single C14 inlet with integrated magnetic filter (like this
https://www.digikey.com/en/products/detail/schaffner-emc-inc/FN9260B-10-06/1929075)
and terminal blocks that I use to wire appropriate patch cords to power
the devices.  I did the same for a couple higher voltage items (mainly
24V devices) and anything that was network related now runs PoE. I used
to have over 40 wall warts and I'm now down to two because they're
oddball voltages (one is 7.5, the other is 15).

I also usually put in ground breaks on all the audio lines between the
radios and computers.  Most of my radios are patched through a couple
Behringer mixers so I can route audio to different places (headphones,
computers, speakers, etc.) but I find that a good portion of audio
problems almost always stems from ground loops.  I buy the ground
isolators intended for automotive applications and patch them inline
with the radios.  The good ones are transformer units so you get
galvanic isolation on the audio lines as well as the ground break.

I've got three VHF/UHF stations and one HF station and no issues from my
operating area.  Nearly all my noise is from the neighborhood coming
into the antenna.
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