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1. 08:53 AM - Re: Re: bench power (Jeff Luckey)
2. 01:53 PM - Re: Re: bench power (Robert L. Nuckolls, III)
Message 1
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Hello Bob,
"is there something i may be applying power to that may cause harm.."
Probably the riskiest thing would be that you have power wires reversed on
some gizmo/accessory.=C2- If you put reverse polarity on a device that is
not protected for it, you could ruin it, even if it is turned off.=C2- S
o be sure to triple check polarity.
"...can anything detrimental happen to the charging system if power is appl
ied to the field wire ..."
No.=C2- The only issue with having power on the field is that it will hea
t-up the field inside the alternator and with no rotation there would be li
ttle cooling.=C2- I don't know your setup but typically you would=C2-re
move power from the regulator by opening=C2-the field breaker.
Another thing to consider is keying-up a transmitter without an antenna.=C2
- In the old days you could damage the output stage of the transmitter wi
thout an antenna load.=C2- Another Lister with more knowledge about trans
mitters might provide more info.
-Jeff
On Monday, January 25, 2021, 04:12:02 PM PST, bobnoffs <icubob@gmail.co
m> wrote:
when i use the 'bench power 'source i plan to only power a small part of my
panel at a time. a couple amps. my questions are1. is there something i ma
y be applying power to that may cause harm the way i plan to do it and 2. c
an anything detrimental happen to the charging system if power is applied t
o the field wire. sorry if i wasn't clear. i know this is kind of ambiguous
as panel wiring varies.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500422#500422
-
S -
WIKI -
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=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 2
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>"...can anything detrimental happen to the charging system if power
>is applied to the field wire ..."
>
>No. The only issue with having power on the field is that it will
>heat-up the field inside the alternator and with no rotation there
>would be little cooling. I don't know your setup but typically you
>would remove power from the regulator by opening the field breaker.
or having the OFF/BAT/ALT+BAT switch in OFF or BAT
>Another thing to consider is keying-up a transmitter without an antenna.
>In the old days you could damage the output stage of the transmitter
>without an antenna load. Another Lister with more knowledge about
>transmitters might provide more info.
That's sorta true in the vacuum tube days . . . but
still valid for long intervals of unloaded transmission.
Early solid state transmitters were germanium transistors
and fragile compared to modern FETS. It wasn't an
instantaneous thing but yeah . . . long-winded 'tests'
were hard on them.
This also pre-dated built-in SWR monitor circuits that reduce
or shut off drive to output stage if poorly terminated. There
probably hasn't been a VHF Comm transceiver in the last
40 years that doesn't have high SWR protection.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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