[ARC5] Impedance of an end-fed short aerial/antenna

[Bob Macklin]

The Command Sets were not used with trailing wire antennas. The bombers 
carried liaison sets that did use trailing wire antennas.

The rotary inductor in the front of the Command Set is the antenna tuner.

The Command Sets were intended only for short range communication. The 
liaison sets were used for long range communication.

Bob K5MYJ

----- Original Message ----- 
From: "Mike Hanz" <aaf-radio-1 at aafradio.org>
To: "Leslie Smith" <vk2bcu at operamail.com>
Cc: "ARC-5 List" <arc5 at mailman.qth.net>
Sent: Thursday, January 31, 2013 4:22 PM
Subject: Re: [ARC5] Impedance of an end-fed short aerial/antenna


> How soon we forget... :-)
>
> http://aafradio.org/docs/Aircraft_Antenna_Design.html
>
> Note the right hand configuration in the charts.
>
> On 1/31/2013 5:37 PM, Leslie Smith wrote:
>> I'm interested in the load impedance of "off-resonant" end fed wires.
>> So - for example if I have a 35 foot length of wire trailing out the
>> back of an aircraft, what complex "Z" will that present to the 1625's in
>> the PA at, say 3.550 MHz.   What it the wire is 55 feet long?
>>
>> Anyway, in the past I found a page that made that calculation - not for
>> an aircraft, but for an end fed random wire.  The calclulation allowed
>> for a good many parameters, eg the dia of the wire (1mm, 2.5mm etc),
>> height of the wire above ground and even soil type.  The calculation
>> result gave the impdedance as resistive and reactive components.
>>
>> Any pointers, clever types?
>>
>> 73 de VK2-land
>>
>>
>> Les
>>
>
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