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KB2VXA > TECH 12.08.04 07:13l 33 Lines 1375 Bytes #999 (0) @ WW
BID : 26258_WT3V
Read: GUEST OE7FMI
Subj: Re: ZS6CFC > car batts
Path: DB0FHN<DB0FOR<DB0SIF<DB0EA<DB0RES<ON0AR<VE2PAK<N1UAN<W1GMF<W1ON<
W1ON-5<K1UOL<K1UOL<WX1CT<WA2PNU<KC2COJ<WT3V
Sent: 040810/2042 26258@WT3V.#CNJ.NJ.USA.NOAM $:26258_WT3V
From: KB2VXA@WT3V.#CNJ.NJ.USA.NOAM
To : TECH@WW
Hi Sten and readers,
Setting the "fumblemechanics" aside, I'll address the one important part
of your bull. You're right even if your wording is confusing, never run
the engine with the battery disconnected! To clarify, you say the
alternator output is regulated, that's the job of the regulator. (;->)
The key part of it is any voltage regulator needs a reference source, the
regulated supply running our Ham equipment uses a zener diode.
The vehicle regulator uses a convenient source, the battery. It's
characteristics are such as the terminal voltage never rises above about
14 volts no matter how much current you throw at it, sort of a heavy duty
zener. Without reference voltage the output of any regulator soars to the
input value, in the case of an alternator it's typically 25 volts. The
reason for this is to allow proper voltage drop across the pass
transistors providing proper regulation of the output, Ohm's Law.
Naturally this voltage will quickly ruin the vehicle's electrical system.
73 de Warren, KB2VXA@WT3V.#CNJ.NJ.USA.NOAM
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Message timed by cesium laser: 20:51 on 2004-Aug-10 GMT
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