[Elecraft] Remote KAT500

[Don Wilhelm]

Fred,

"Real" RS-232 drivers use +/- 15 volts rather than +/-5 or even +/- 12 
volts - the maximum open circuit voltage is +/- 25 volts.
The key is that at the receiver end, the levels must be +/-3 volts or 
greater.  Both cable resistance and cable capacitance will reduce the 
levels at the end of a long run.

73,
Don W3FPR

On 1/21/2016 5:44 PM, Fred Jensen wrote:
>
> 2.  I should be able to make RS-232 work.  I personally know that many 
> so-called RS-232 drivers use +/-5 V rather than +/-12 V. This is a 
> problem I can solve.
>