DW Holtman <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Hello,
The devices used for current limiting are are cheap, and easy to
install. The link below is the data sheet for one brand. Note the CL-80
and CL-90, both work great on most receivers. In addition to providing
surge protection on start up, the hot resistance is several ohms. This
will drop the line voltage applied to the equipment a couple of volts,
which is more the voltage that they were designed for.
http://www.thermometrics.com/assets/images/cl.pdf
The link below is from Jan Skirrow's site. It explains this type of
thermistor, along with showing how they are installed in a R-390a. The
installation for any receiver or transmitter will be similar. Just pay
attention to what he says about heat generation. A good way to mount
them is in an external 2 plug electrical box. They can be bought very
cheap at Home Depot etc.
http://skirrow.org/Boatanchors/TechTalk3.pdf
I have about 20 CL-80's and 20 CL-90's, if anyone wants one, I will sell
them for $3.00 each shipped. That is about what I will have into them
with shipping. I also make some very nice complete units with RFI
filters built in. They greatly reduce computer and other noises getting
into your radios. If you would like more information, let me know. I can
send pictures/specs of the units that I make.
Hope this helps on the thermistor questions.
73's
DW Holtman
WB7SSN
[EMAIL PROTECTED] wrote:
[EMAIL PROTECTED] made an utterance to the drakelist gang
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On Thu, 19 Jan 2006, Keith Hamilton wrote:
Has anyone tried the soft-start current limiting boxes sold by Sigtomics
(http://sigtomics.com)? Would that help prolong the life of the on-off
switch as well as the transformer? My AC-4 really "thumps" when I turn
my T-X4C transmitter on. Seems a better solution than a cheap computer
power strip. Or not?
I've got the 600/1000W version for amps. I've used it with my R-4B and
T-4XB plugged into a power strip from the lower wattage outlet on the
sigtomics box - when plugging the sigtomics box into a wall outlet the
R-4B and T-4XB (and AC-4) are silent when coming on... no thump at all.
If I knew what make/model of thermistors were in the sigtomics box I'd buy
a few (they can't cost more than a dollar each) and put them in the power
strips. The voltage does not sag between idle and key down - so despite
my earlier concerns about thermistors and voltage sag it seems to work
quite well.
--
73 Jason N1SU
http://n1su.com/
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