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G8MNY > TECH 07.11.18 11:02l 87 Lines 2727 Bytes #999 (0) @ WW
BID : 44436_GB7CIP
Read: GUEST
Subj: 23cm 10el Yagis for ATV
Path: IZ3LSV<IR2UBX<F1OYP<ON0AR<GB7CIP
Sent: 181107/1002Z @:GB7CIP.#32.GBR.EURO #:44436 [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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