Pat

 

Don't believe they are 'loading up' the spacecraft itself against the universe ;~). Antennas take the form of monopoles (spacecraft is the 'groundplane'), dipoles, quad helix etc.

 

Jay W1VD  WD2XNS  WE2XGR/2 

----- Original Message -----

From: pat

To: [email protected]

Cc: edgar

Sent: Wednesday, July 10, 2013 5:51 AM

Subject: Re: Fwd: Re: LF: VK1OD's analysis of the MiniWhip antenna

I don't know if my previous posts arrived but I still prefer to think that a "small" antenna is one plate of a capacitor and the rest of the universe is the other. This then enables the spacecraft antenna to work. The universe is not a great big empty space!

73 de Pat



On 10/07/13 08:58, edgar wrote:

I sent this message two days ago and I did not see it arrive.

Although the subject is now out of context, I would like some comment on my question.

Regards, Edgar
Moonah, Tasmania.


-------- Original Message --------

Subject:	Re: LF: VK1OD's analysis of the MiniWhip antenna
Date:	Mon, 08 Jul 2013 00:06:50 +1000
From:	edgar <[email protected]>
To:	[email protected]

Hi Pieter-Tjerk,

If that is the case, and all the parts are at the same potential, how 
does a space craft, radio controlled model aeroplane

get their signals?

Surely every conductor in the unit will have a difference in potential 
due to being in a electromagnetic field.

Even in the legs of the FET. Although the potential will be extremely small.

Surely it is only necessary to have a change of the Vgs voltage of the FET.

So the geometry of the antenna has to be made to allow this to occur.

Regards, Edgar
Moonah, Tasmania.

-- 
73 de pat g4gvw
es gd dx
qth nr Felixstowe
East Coast UK

-- 
73 de pat g4gvw
es gd dx
qth nr Felixstowe
East Coast UK