[Milsurplus] [MRCA] Component storage

[Mike Feher]

Hi Mike - 

 

I had the same issue with my Astro Cubic 102BXA about 40 years ago. When I
build filters I like to use the Cauer/Elliptic design. I built a HP filter
for the radio and put in in the receiver chain. I designed it such that
there would be a zero at the most offending AM station. Worked great. 73 -
Mike 

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

 

-----Original Message-----
From: mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> On Behalf
Of mstangelo at comcast.net
Sent: Tuesday, November 22, 2022 11:47 AM
To: mrca at mailman.qth.net; milsurplus at mailman.qth.net
Subject: [MRCA] Component storage

 

One lesson I learned the hard way is to store components in containers or
bags which would not decompose of outgas. I got rid of the black plastic
foam years ago and store most of my components in static free pink or opaque
black bags.

 

Years ago I matched some polystyrene capacitors on an HP Capacitance meter
at work. I saved the caps in a piece of paper where I documented the values.

 

I'm working on a uBITX QRP rig and noticed the receiver overloads with AM
broadcast station because the receiver section only has a low pass filter
for the HF bands so I decided to built a high pass filter to attenuate all
signals below 2 MHz.

 

I went to my polystyrene cap drawer to select capacitors. I noticed the
paper turned yellow and all of the caps stored in the paper had discolored
leads and would not take solder. Apparently the acid used in the papermaking
process attacked the plated leads. Fortunately the other caps were good.

 

One is never to old to learn something new.

 

Mike N2MS

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