[amsat-bb] S-band patch.
archie.hackett at hotmail.com
Wed Feb 27 10:12:58 PST 2008
I can assure you the patch *IS* correct.
The photo is taken from the rear, what you are seeing in the photo is the 'rear' of the reflector and the back end of the gold SMA connector.
The radiator - (hidden by the larger reflector, in the photo) - is connected to the pip of the SMA connector and is mounted 3mm 'above' the reflector.
The radiator is 'cut' for 2401Mhz and is made from silver plated brass sheet ... bas is the reflector.
I think what may have fooled you is ...
1) Not realising you were looking at the rear of the patch.
2) The fact that my reflector is square, not round.
The G3RUH design uses a round reflector, the K3OE uses square.
As far as I can assertain there is no practical difference between the designs.
73 John. <la2qaa at amsat.org>
From: sv1bsx at yahoo.gr
To: la2qaa at amsat.org
Subject: Re: [eu-amsat] S-band test gear.
Date: Wed, 27 Feb 2008 15:03:14 +0200
I read your post but I am afraid that, your
PATCH is not correct. Sorry if I am wrong, but due to non-clear photo I
on the Left-UP part of photo ONLY
the "drive element" of Patch (the square-piece with cut-corners ) without
the "circular piece" behind of drive-element which acts as
As I see also in your photo, the chassis-connector is
mounted on this square piece and not to the
If that is not my... illusion, that is not a
correct Patch. I send you a clear photo to take a view how is the
complete Patch by viewing that from the front-side.
----- Original Message -----
To: allan_gm1sxx at hotmail.com
Cc: sv1bsx at yahoo.gr ; amsat-bb at amsat.org ; Eu-amsat at yahoogroups.com
Sent: Wednesday, February 27, 2008 1:22
Subject: [eu-amsat] S-band test
Based on SV1BSX's comments about receiving a *THUNDERING* signal
from AO-51's S-band transmitter on a patch antenna 'without' a reflector - I
decided to chuck together a few components to see if somebody as 'thick' as
LA2QAA could manage it.
The attached pic is the ... 'fruits of LA2QAA's
Starting at the top right we have a silver covered brass plate
2.4Ghz patch antenna (note the real gold SMA connector, folks) mounted 3mm
over a (ditto) groundplane, via a short length of high quality (fell off the
back of a North Sea Oil industry lorry) coax feeding the input of a 2.4G
70 70cm converter ... the output of which goes to the IC-E91 dual mode
handheld and a pair of 'cans' ... (headphones, to you!).
To the right
of the IC-E91 is a Nokia N70 mobile phone - (not shown in this pic because I
was using it to take the picture) - with the 'SATme' tracking software ....
which is very !! useful for tracking S-mode signals from LEO birds with the
'slight' doppler thus received.
The phone also contains a compas as
well as GPS software so there's no excuse for ... 'but I can't find north' ...
(not always easy in 3 feet of snow, null visibility and cloudy conditions) ...
and there's *NEVER* a brownie or a girl guide around when you want one.
S-band signals in those conditions? ... you'd be surprised - we don't
all live in satellite friendly climes you know.
Mak (SV1BSX) is right.
A 60cm dish is overkill for AO-51 mode-S ... though of course, there are!
those that think you need a personal
Jodrell Bank to hear anything above
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