Antenna Parts Suppliers

On this page I will list companies and links to them that supply parts for building antennas. If you know of a good supplier, wherever you are in the world, let me know and I will list them here. Do check ou tht eG0KSC shop, lots of bits a pieces needed to build your antennas being added all of the time!

http://g0ksc.co.uk/shop.html

Aluminium Suppliers

Aluminium Warehouse - Located in the centre of the UK with very cheap, but have you ever heard the epxression 'IQ Zero'? That is what they are, clueless. Load os mistakes with orders, send you the wrong gear and make mistakes which are 'not their fault' handle with care!!

http://www.aluminiumwarehouse.co.uk

Wires.co.uk

Wires.co.uk - Suppliers of all sorts of wire from hard drawn copper to 4.75mm thick aluminium wire. a good source and good prices too. Located in the UK.

http://www.wires.co.uk

Send me your suggestions for this page justin '@' G0KSC.co.uk

 

NBS Antennas & Masts
By appointment
Factory 9, 53-55 Sinclair Rd
Dandenong   Vic.  3977
 Australia
Suppliers of telescopic drawn and round aluminium tube and associated items
for amateurs to build their own antennas, including stainless steel wire and
fittings, and machining of plastics and aluminium.
Aluminium can be cut to length prior to shipping to reduce shipping costs
and damage.
Amateur radio operators helping amateur radio operators

Contact details:   Phone Mobile 0402 930 581
                   Email:  This email address is being protected from spambots. You need JavaScript enabled to view it.
                   Callsign:  VK3BSN/NBS

G0KSC SC2803Q 3el 28Mhz OWA Quad Antenna with a 4 Metre Length Boom

This antenna produces 9.34dBi ofr forward gain with 32dB front to back ratio at 28.500 Mhz. This has been achieved over a respectable 500 Khz bandwidth on a boom of only 4 metres in length. This is around one metre+ less than would be required to see similar gain from a Yagi. In addition, I have been able to model the antenna without the narrow bandwidth characteristics normally associated with an antenna of this kind.

Bandwidth is a little smaller than on 50 and 70 Mhz as we are still using 2MM wire. If this was increased (which would need re-modelling) the bandwidth would be greater.

As with all my antennas, this is a non-critical design and therefore, any small errors in you calculations when building the antenna WILL NOT have a great impact on the antennas final performance.

Dimensions in Metres

Element spacing:

• Ref =      0
• Driven =  1.8
• D1 =       4

Elements lengths - full quad length:

• Ref =       11.128
• Driven =   10.752
• D1 =       10.328

Performance figures @ 28.500Mhz:

• Froward Gain: 9.34dBi free space
• Front to Back: 32.13dB
• Radiation angle at 10 Metres above ground: 15 degrees

 

Element diameter:

This antenna has been models with 12#/ 2.05MM copper wire. You will need to mail me if you wish to use a different gauge as the model will change. Isolated spacers will be needed. fiberglass would be a good option.

NOTE:

Build orientation is as per the layout image below with the feed point on the bottom section of the quad indicated by a red circle.

Feeding the Antenna

Whilst OWA is not normally a term used in quad antennas, I felt it appropriate due to the low SWR and wide bandwidth of this antenna. Like all of my antennas, this has a 50Ohm impedance so can be fed directly with 50Ohm coax, no matching is required. However, a balun or RF chokes should be used in the coax as close to the feedpoint as possible.