huh?  I appologize if this was in-jest and I didn't recognize it.

You apply a potential when you connect something (a voltage).  You don't 
apply a current.

Neither voltage nor current kill most things.  There are a few kinds of 
things that are voltage sensitive but not typically found on the input of a 
commercial device.  Power kills most things through direct conversion to 

There's so many different powering circuits that's is just not possible to 
draw any across the board generalities.  Some things have AC supplies and 
generate DC, some take DC and run through a regulator, some take DC and run 
it into an inverter and then generate their own DC.

Depends on the radio and the powering circuitry.  I know what's in the 
Motorola, and they have an inverter and regenerate their own DC.   If you 
check the specs for some brand radio, if you see a voltage spec with a 
"range" of voltage (say 12v to 24v) its probably running an onboard 
inverter.  These are pretty hardy (they naturally support a wide range of 
applied voltage).

On the other hand, a radio with a voltage spec without a range may only have 
an onboard regulator, and these may be popped by overvoltage.  Simple 
onboard regulators drop the input voltage down to whatever the board wants, 
and the dropped voltage x the radio current is power that is dissipated to 
heat in the regulator.


----- Original Message ----- 
From: "Brian Rohrbacher" <[EMAIL PROTECTED]>
To: "WISPA General List" <>
Sent: Saturday, February 04, 2006 2:53 PM
Subject: Re: [WISPA] OT amps and volts

Lets exaggerate here.  I can plug a billion amps in and it will only
draw what it wants, but if I go a volt or two over it fries.

Chuckk wrote:

> Over voltage will kill the radio or board current is only drawn as
> needed.
> Chuckk
> Brian Rohrbacher wrote:
>> It's not actually mine.  It's another's from the list.  We were
>> talking about it.  But I am sure that on my 230 ft run of cat 5 that
>> I had to replace an 18v 1a with an 18v 2a to get the radio to stop
>> rebooting.  The individual I was talking to thought if you up the
>> amps it will kill the radio.  I thought if you up the volts it kills
>> the radio.  Who is right?
>> Well, actually I know what the cat 5 is.  It's comscope 25 pair.
>> Which brings up another question.  Who does this?  Run a single
>> bundle of 25 pair up towers and use punch down blocks.  Any issues
>> with this?
>> Brian
>> Sean S gayle wrote:
>>> Brian,
>>>   I'm normally a lurker, but maybe your problem is in the 300' run
>>> of CAT5.
>>> What kind is it?  You may be getting signal degradation which is
>>> causing the
>>> sporadic radio behavior.
>>> Sean
>>> JohnnyO's evil twin
>>> -----Original Message-----
>>> Behalf Of Brian Rohrbacher
>>> Sent: Saturday, February 04, 2006 2:01 PM
>>> To:
>>> Subject: [WISPA] OT amps and volts
>>> I'm a little confused here.  I'm working on a 300 ft run of cat5 and
>>> have a question.  The radio is acting sparatic.  The power supply
>>> has already been upped from a 18v to a 24v.  Both 1 amp.  Will it
>>> hurt to put a 24v 2 amp power supply in?  If I "over do" on amps or
>>> volts, what blows a radio.  One or both?  I seem to remember being
>>> told that a radio only takes what amps it needs, so putting a higher
>>> amp power supply in won't hurt, but if you put too many volts in,
>>> that will fry them.  Please clarify me on this.

Brian Rohrbacher
Reliable Internet, LLC
Cell 269-838-8338

"Caught up in the Air" 1 Thess. 4:17

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