Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Registered members
Current visitors
Charts
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Gold Prospecting
Do It Yourself (DIY) Projects
HF radio antenna - DIY
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support Prospecting Australia:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="user 12139" data-source="post: 617087" data-attributes="member: 12139"><p>I'd suggest a half wave dipole made of wire for 27mHz and as Jaros highlighted a 1/4 wave ground plane for UHF.</p><p></p><p>Why.. because the radiation patterns will better suit each band.</p><p></p><p>Get a SO239 and make a 1/4 wave with it like the below pic... bend the radials down slightly same as in the pic, this will drop the feed point impedance down to around 50 ohm and make it a perfect match for the transceiver.. You'll still have to tune it with a SWR meter, but you only trim the (+) vertical element</p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/12139/1628513825_25_wave.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>and remember, height is might... get them up as high as you can!</p></blockquote><p></p>
[QUOTE="user 12139, post: 617087, member: 12139"] I'd suggest a half wave dipole made of wire for 27mHz and as Jaros highlighted a 1/4 wave ground plane for UHF. Why.. because the radiation patterns will better suit each band. Get a SO239 and make a 1/4 wave with it like the below pic... bend the radials down slightly same as in the pic, this will drop the feed point impedance down to around 50 ohm and make it a perfect match for the transceiver.. You'll still have to tune it with a SWR meter, but you only trim the (+) vertical element [img]https://www.prospectingaustralia.com/forum/img/member-images/12139/1628513825_25_wave.jpg[/img] and remember, height is might... get them up as high as you can! [/QUOTE]
Verification
Post reply
Gold Prospecting
Do It Yourself (DIY) Projects
HF radio antenna - DIY
Top