R:190809/0714Z 7803@VA3TOK.#SCON.ON.CAN.NOAM LinBPQ6.0.18
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R:190809/0713Z 33924@NS2B.#WNY.NY.USA.NOAM BPQ6.0.18
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R:190809/0713Z 6942@GB7YEW.#79.GBR.EURO LinBPQ6.0.18
R:190809/0712Z 74593@VK2IO.#SYD.NSW.AUS.OC BPQ6.0.18
R:190809/0712Z @:VK2DOT.CC.NSW.AUS.OC #:31482 [Niagara Park] $:15251_GB7CIP R:190809/0711Z @:VK1KW.ACT.AUS.OC #:10613 [Canberra, QF44] FBB7.00i R:190809/0711Z 16146@VK2RZ.#SYD.NSW.AUS.OC LinBPQ6.0.16
R:190809/0711Z @:GB7CIP.#32.GBR.EURO #:15251 [Caterham Surrey GBR]

From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW

Schematic for 1.2 GHz ATV ant
From G3ZJO (new Feb 06 edited G8MNY)

I have great success with the following dimensions which are from an old DOS yagi design program.

Make the BOOM from double sided PCB 10 - 15mm wide.

Make the elements from brass brazing rod 3mm dia or copper wire.

Make the driven element a folded dipole or use a gamma match.

1249MHz 1316MHz
Reflector Length = 12.20cm 11.57cm
Reflector Spacing = 4.80cm 4.55cm

Driven Element = 11.40cm 10.81cm

Director1 Spacing = 2.88cm 2.73cm
Director1 Length = 10.83cm 10.27cm

Dir2 Spacing = 3.34cm 3.17cm
Dir2 Length = 10.72cm 10.17cm

Dir3 Spacing = 3.88cm 3.68cm
Dir3 Length = 10.62cm 10.07cm

Dir4 Spacing = 4.50cm 4.26cm
Dir4 Length = 10.51cm 9.97cm

Dir5 Spacing = 5.22cm 4.95cm
Dir5 Length = 10.40cm 9.87cm

Dir6 Spacing = 6.05 5.74cm
Dir6 Length = 10.30cm 9.77cm

Dir7 Spacing = 7.02cm 6.66cm
Dir7 Length = 10.20cm 9.67cm

Dir8 Spacing = 8.14cm 7.72cm
Dir8 Length = 10.10cm 9.57cm

Boom Length = 45.82cm 43.45cm
Gain = 11.67dBd 11.67dBd .........................................................................

For Gamma matching drill holes & solder all elememts at center point.

ref de dir1 2 3 4 5 6 7 8
------------------------------------------------------------
o o o o o o o o o o

----I--------------------------------------------------------
===feeder=0
I

BNC or N socket mounted in a notch in the boom.

Detail of Gamma match
22mm
Driven ele. -----------------------------I-----------o---------------
C 5pF var.
o-----------o
.........................................................................

For Folded dipole notch top of boom & solder center of element, feed at
socket.
ref de dir1 2 3 4 5 6 7 8
------o------------------------------------------------------
o o o o o o o o o

-----I-------------------------------------------------------- ====feeder==0o
I

BNC or N socket mounted in notch. ........................................................................
73 - Eddie, G3ZJO @ GB7BEN


Why don't U send an interesting bul?

73 de John G8MNY @ GB7CIP





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