Hi Kim!
The main problem would be, if the charging current for the large
capacitor is maintained for a long enough time the reactor will not be able
to hold the current down due to saturation this sometimes causes the
rectifiers and fuses to blow during the initial charge up. Some folks that
like to use very large capacitors in big rigs will have "stepping" startup
circuits so that the capacitors charge up slower limiting the initial surge.
If you're not having any trouble with blowing fuses of rectifiers you're
probably OK with the large capacitor.
John,
WA5BXO
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Kim Elmore
Sent: Tuesday, December 09, 2003 5:32 PM
To: AMRadio
Subject: [AMRadio] Power Supply Question
I wish to avail myself of the knowledge here: My Dad, W5JHJ, has a WRL
Globe Champion 350 and is the original owner. He's maintained it and it
works well, but I wonder if a mod he made years ago was a good one. Like
most AM transmitters, it uses a choke-input PS design. I cannot recall the
input choke values, but do recall that it incorporates a swinging choke and
that the filter capacitor was originally quite small (2 uF, I think). that
capacitor failed some time ago, and as I was looking at his documentation
saw that he'd replaced it with something like 40 uF.
On the list, I recall scrolling across a few postings (now lost) that said
something about how these PS should be designed. There, I thought I saw
something along the lines of it being possible to have too much filter
capacitance. Did I get that right? If so, what's the symptom of too much
filter capacitance in a choke input filter?
Kim Elmore, N5OP
Kim Elmore, Ph.D.
University of Oklahoma
Cooperative Institute for Mesoscale Meteorological Studies
"All of weather is divided into three parts: Yes, No, and Maybe. The
greatest of these is Maybe" The original Latin appears to be garbled.
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