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The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Voyager trails a long wire for LF G.. From: pat Sent: Wednesday, July 10, 2013 5:17 PM To: rsgb_lf_group@blacksheep.org Cc: jrusgrove@comcast.net Subject: Re: Fwd: Re: LF: VK1OD's analysis of the MiniWhip antenna [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.29 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: fcf77e2759cb043d8839e008dc214d5a Subject: Re: Fwd: Re: LF: VK1OD's analysis of the MiniWhip antenna Content-Type: multipart/alternative; boundary="----=_NextPart_000_0056_01CE7D94.A4FDC790" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.0 required=5.0 tests=HTML_30_40,HTML_MESSAGE, HTML_TAG_EXISTS_TBODY,MISSING_OUTLOOK_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Status: O X-Status: X-Keywords: X-UID: 1852 This is a multi-part message in MIME format. ------=_NextPart_000_0056_01CE7D94.A4FDC790 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Voyager trails a long wire for LF =20 G.. =20 From: pat=20 Sent: Wednesday, July 10, 2013 5:17 PM To: rsgb_lf_group@blacksheep.org=20 Cc: jrusgrove@comcast.net=20 Subject: Re: Fwd: Re: LF: VK1OD's analysis of the MiniWhip antenna Hi Jay, That still leaves us with the anomaly that in the context we are = discussing here viz. 'LF', the "spacecraft" might be an awfully small = piece of real estate compared to the wavelengths we are dealing with :>) It's the proverbial "isotropic" source problem isn't it? 73 On 10/07/13 13:04, jrusgrove@comcast.net wrote: 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=20 ----- Original Message -----=20 From: pat=20 To: rsgb_lf_group@blacksheep.org=20 Cc: edgar=20 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=20 Date: Mon, 08 Jul 2013 00:06:50 +1000=20 From: edgar =20 To: rsgb_lf_group@blacksheep.org=20 Hi Pieter-Tjerk, If that is the case, and all the parts are at the same potential, how=20 does a space craft, radio controlled model aeroplane get their signals? Surely every conductor in the unit will have a difference in potential=20 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. --=20 73 de pat g4gvw es gd dx qth nr Felixstowe East Coast UK --=20 73 de pat g4gvw es gd dx qth nr Felixstowe East Coast UK ------=_NextPart_000_0056_01CE7D94.A4FDC790 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Voyager  trails a  long  wire  for  = LF =20
 
G..  

From: pat
Sent: Wednesday, July 10, 2013 5:17 PM
Subject: Re: Fwd: Re: LF: VK1OD's analysis of the MiniWhip=20 antenna

Hi Jay,

That still leaves us with = the anomaly=20 that in the context we are discussing here viz. 'LF', the "spacecraft" = might be=20 an awfully small piece of real estate compared to the wavelengths we are = dealing=20 with :>)
It's the proverbial "isotropic" source problem isn't=20 it?

73


On 10/07/13 13:04, jrusgrove@comcast.net = wrote:
Pat
 
Don't believe they are 'loading up' = the=20 spacecraft itself against the universe ;~). Antennas take the form of=20 monopoles (spacecraft is the 'groundplane'), dipoles, quad helix=20 etc.
 
Jay W1VD  WD2XNS =20 WE2XGR/2 
----- Original Message -----
From:=20 pat
To: rsgb_lf_group@blacksheep.org
Cc: edgar
Sent: Wednesday, July 10, = 2013 5:51=20 AM
Subject: Re: Fwd: Re: LF: = VK1OD's=20 analysis of the MiniWhip antenna

I don't know if my previous posts = arrived but I=20 still prefer to think that a "small" antenna is one plate of a = capacitor and=20 the rest of the universe is the other. This then enables the = spacecraft=20 antenna to work. The universe is not a great big empty = space!

73 de=20 Pat



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

I sent this message two days = ago and I=20 did not see it arrive.

Although the subject is now out of = context,=20 I would like some comment on my question.

Regards, = Edgar
Moonah,=20 Tasmania.


-------- Original Message --------=20
Subject: Re: LF: VK1OD's analysis of the MiniWhip antenna
Date: Mon, 08 Jul 2013 00:06:50 +1000
From: edgar <edgarjtwining@virginbroadband.com.au>=
To: rsgb_lf_group@blacksheep.org


Hi Pieter-Tjerk,

If that is the case, and all the parts are at the same potential, how=20
does a space craft, radio controlled model aeroplane

get their signals?

Surely every conductor in the unit will have a difference in potential=20
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.







--=20
73 de pat g4gvw
es gd dx
qth nr Felixstowe
East Coast UK


--=20
73 de pat g4gvw
es gd dx
qth nr Felixstowe
East Coast UK
------=_NextPart_000_0056_01CE7D94.A4FDC790--