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Ozfisho
Junior Member
Username: Ozfisho

Post Number: 11
Registered: 4-2012
Posted on Tuesday, November 27, 2012 - 5:56 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hi all, I've finished making my Gizmotchy 4 beam antenna for 11 meters and now that I'm doing my amateur license, can I use a ATU on my antenna for other bands?
Regards
Dale
Western Australia
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Starface
Senior Member
Username: Starface

Post Number: 3212
Registered: 1-2005


Posted on Friday, November 30, 2012 - 2:50 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

it might work on 10 and 12 with that antenna but anything other I don't think it's going to tune very well if all.
George
KI4NBE
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Keithinatlanta
Advanced Member
Username: Keithinatlanta

Post Number: 993
Registered: 3-2003
Posted on Friday, February 28, 2014 - 6:15 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Ok guys, this is an old post, but in reading it just now, I am curious.

What is an ATU? Thanks.

Keith in Atlanta
CEF 150
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Tech237
Moderator
Username: Tech237

Post Number: 1761
Registered: 4-2004


Posted on Saturday, March 01, 2014 - 1:02 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Keith an ATU is Antenna Matching Unit - really a misnomer as it truthfully does not match the antenna, just tricks the radio into thinking its matched.
Tech237
N7AUS

God made me an athiest, who are you to question his wisdom?
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Keithinatlanta
Advanced Member
Username: Keithinatlanta

Post Number: 995
Registered: 3-2003
Posted on Sunday, March 02, 2014 - 9:16 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thank you sir. I appreciate the info here. As always, a great place to learn.

Keith in Atlanta
CEF 150
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Tech833
Moderator
Username: Tech833

Post Number: 2286
Registered: 8-2002
Posted on Monday, March 03, 2014 - 12:39 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

If you mount it at the antenna feedpoint, then it truly is an antenna matching unit. If you mount it at the radio end of the feedline, then it is an impedance matching unit operating with variable system losses.
Your radio 'Mythbuster' since 1998
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Raya
New member
Username: Raya

Post Number: 3
Registered: 6-2017
Posted on Thursday, May 16, 2019 - 12:37 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

237 is absolutely right. An antenna tuner at the radio does not tune the antenna itself. It only makes the radio think the antenna is 50 ohms impedance. And while it only tricks the radio, it does serve a useful purpose. An otherwise useless antenna may become "Somewhat" usefull.

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