[Boatanchors] Coax Switches and Wire Antennas

[Carl]

The switch path is too short to offer an impedance bump at HF. The 
limitations will be the switch insulation to a high RF voltage which will 
depend upon the point it is connected and the power. An antenna program will 
easily show voltage and current sine waves on the transmission line and 
there may be a "magic" length that works for you.

Carl
KM1H


----- Original Message ----- 
From: "Jim" <jbrannig at verizon.net>
To: "Bill Stewart" <cwopr at embarqmail.com>; "boatanchors" 
<boatanchors at mailman.qth.net>
Sent: Wednesday, March 30, 2011 10:16 AM
Subject: Re: [Boatanchors] Coax Switches and Wire Antennas


> Bill,
> Coax switches are designed for the voltage levels encountered in a matched
> 50 ohm environment.
> Transmit voltages on an unmatched single wire could exceed the design
> voltage and/or current levels of the switch.
>
> Jim
>
>
>>
>>
>> Good morning all,
>>
>> Can a normal coax switch be used to switch single wire fed antennas such
>> as a long wire or OCF Hertz (windom-a hi imped. antenna), in my case. No
>> coax feed used, just a wire from the wire antenna thru the center
>> conductor of the switch and then to the xmtr or tuner. I have 'heard' 
>> that
>> a coax connector presents a 50 ohm 'lump' in the line.
>>
>>
>>
>> I know this can be done electrically, but just wondering about the '50
>> ohm' situation. Tnx for helping with a stooopid question.
>>
>>
>>
>> 73, Bill K4JYS
>
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