Grip Packs

Contents:

The Spooktech Grid Antenna
18dBi 23cm-band Gridpack Antennas (900mm)
SG Lab's 1296 Mhz PCB Antenna
Bow Tie Antenna
A TDJ-2400SPD4 High Gain 17dBi 2.4G WIFI Wireless Grid Parabolic Antenna with N-type Female connector
5Ghz Antenna
Tube Grid
23Yagi

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The Spooktech Grid Antenna

https://www.spooktech.net/ham-radio/antennas

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18dBi 23cm-band Gridpack Antennas (900mm)

23cm/1296MHz/1.3GHz Antenna
Freq Range: 1.24-1.3GHz
Bandwidth 60Mhz
Gain: 18dBi
VerBeamwidth: 18 (Horizontal Beamwidth when used in Horizontal polarisation)
HorBeamwidth: 28
F/B Ratio: ;gt&25dB
VSWR: ;lt&1.5
Impedence: 50 Ohm
Polarization: Vertical or Horizontal
Max Power: 100W
Connector: N-Female
Dimensions: W600xH900mm (Horizontal Polarity orientation)
Weight: 4.5Kg
Rated Wind Velocity: 60m/s
Mast Diameter: 40-50mm
Manufactured: 2021

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SG Lab's 1296 Mhz PCB Antenna

Copper is 92mm long and 50mm wide

Director/Reflector Side:

Driven Side:

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Bow Tie Antenna

https://www.qsl.net/ok1ayu/projects/ant23.htm

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A TDJ-2400SPD4 High Gain 17dBi 2.4G WIFI Wireless Grid Parabolic Antenna with N-type Female connector

eBay item number: 201984584638:

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5Ghz Antenna

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Tube Grid

Diamensions:

Length: 930
Centre Width: 810
End Width: 380
Tube Diameter: 13
Tube Spacing: 60 centre to centre (40mm gap)
Bolt Holes: 110 x 110 centres

Advise from Bruce, VK4BMI:

To find focal length, (diameter squared/16) x depth. Units don’t matter as long as they are all the same. Measure the diameter diagonally across widest point, then measure depth at the centre of dish.

Now you have focal length you can work out f/D, focal length to diameter ratio. Then google feeds for parabolic antenna to find suggestions for this f/D. This is a flattish dish, it probably had a disk reflector and a dipole.

The gaps between “ribs” should be up to about 1/10 wavelength so 40mm is a bit higher than optimum (looks like a UHF grid pack) for 1296. It could be lined with conductive wire, this would also make it polarisation independent.

Diameter at widest point is 930 and the depth to centre is 170. Fical Length = (930 x 930) / (16 x 170) = 318 mm. F/D ratio is therefore 318 / 930 = 0.34. This agrees with it being a flattish dish, a deep dish might be 0.45 to 0.5 and difficult to illuminate efficiently.

You could google parabolic dish feeds or 23cm dish feeds. However, a half wave dipole with disk reflector about 5 to 10% bigger than the dipole. This is what it would probably have had at UHF, hence the elliptical shape to match dipole E & H planes. Grid packs with scalar feeds were round.

A brass or copper dipole and solder a nut and screw to make the length adjustable for tuning woiuld be suitable

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23Yagi

VK4ADC'S 23cm / 1296 MHz 26 element Field Day Yagi Construction:
https://vk4adc.com/web/index.php/vhfuhf-projects/22-1296-antennas/165-23cm-fd-yagi

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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl20211213 - pre published v0.9