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Blue Boy
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Call Sign : 26-CT-3366
Posts : 29
Times Thanked : 0
Join date : 2019-09-14
QTH or Location : North Manchester
Equipment Used : tti 660 - binatone 5 star
Age : 68

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PostSubject: DIY AERIALS   DIY AERIALS Icon_minitimeTue Mar 24, 2020 12:45 am

Can anybody tell me if the idea of a full wave length antenna (about 77" if I've done my calcs right) would be of help on 2m or indeed if a full wavelength antenna (about 25.2") would help on 70cm?
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GaryWilson
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GaryWilson

Call Sign : 26-CT-1836 Ham 2E0GGQ
Posts : 2373
Times Thanked : 174
Join date : 2019-06-27
QTH or Location : Braunston Northamptonshire.
Equipment Used : Radios & Wires & Stuff!
Age : 56

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PostSubject: Re: DIY AERIALS   DIY AERIALS Icon_minitimeTue Mar 24, 2020 5:51 am

Hello Tom,

A full wave antenna will have an undesirable radiation pattern. Look at making 1/4, 1/2 or 5/8  wave designs.

You can download some antenna modelling software to assist you or use existing and proven models of which there are many available on the net.

73's Gary.
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Blue Boy
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Call Sign : 26-CT-3366
Posts : 29
Times Thanked : 0
Join date : 2019-09-14
QTH or Location : North Manchester
Equipment Used : tti 660 - binatone 5 star
Age : 68

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PostSubject: Re: DIY AERIALS   DIY AERIALS Icon_minitimeTue Apr 07, 2020 2:33 am

Hi Gary, very remiss of me - thought I had replied - thank you for the info and can understand the comments on full wavelength. Just getting an antenna analyzer so hope to be able to get a better idea of whether I am near the mark with my own designs using tested formulas etc. Thanks again..
Tom
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GaryWilson
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GaryWilson

Call Sign : 26-CT-1836 Ham 2E0GGQ
Posts : 2373
Times Thanked : 174
Join date : 2019-06-27
QTH or Location : Braunston Northamptonshire.
Equipment Used : Radios & Wires & Stuff!
Age : 56

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PostSubject: Re: DIY AERIALS   DIY AERIALS Icon_minitimeTue Apr 07, 2020 6:45 am

You're very welcome Tom, no worries.

I recently acquired a "Nano VNA" from ebay for £30 pounds. It might be worth checking out if you haven't already ordered your analyzer.

73's Gary.
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