Fw: [Hallicrafters] SX-110A question

[Mark Bell]

Maybe I'm a bit dull, but I still don't get the part with the resistor.

With no excess voltage, you have 110V (give or take) across the resistor.

With an excess voltage, say X volts, you have 110 + X across the resistor.

The only thing I see that changes is the current.

Mark K3MSB

----- Original Message ----- 
From: <Troglodite at aol.com>
To: <wb8jkr at juno.com>; <future212 at comcast.net>
Cc: <hallicrafters at mailman.qth.net>
Sent: Monday, January 24, 2005 8:01 AM
Subject: Re: Fw: [Hallicrafters] SX-110A question


>
> In a message dated 1/23/05 1:20:05 PM Central Standard Time,
wb8jkr at juno.com
> writes:
>
> I  understand the reason for the capacitor, its
> the 470 K resistor that has me  baffled.
>
>
>
> The purpose of a resistor found between the chassis and one of the line
cord
> connections is to bleed off any charge that may develop on the chassis due
> to the connection to an external antenna.
>
> In the late 50's and early 60's this was a UL rule. Any device with a
> connection for an external antenna had to have such a resistor. It could
be  found
> on virtually every FM tuner produced during that period.
>
> I don't know if it is still a UL requirement today for devices with a two
> wire cord.
>
> Doug Moore
>
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