Antenna - Theory .com: The Antenna Site

Antenna Basics Antenna Types Smith Charts Antenna Measurements

antenna-theory.com :: View topic - Element spacing
antenna-theory.com Forum Index antenna-theory.com
Antenna Theory
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Element spacing

 
Post new topic   Reply to topic    antenna-theory.com Forum Index -> Questions Related to Antenna Theory
View previous topic :: View next topic  
Author Message
JerryJ
Antenna-Theory.com Newbie


Joined: 10 Aug 2011
Posts: 2
Location: Ontario

PostPosted: Wed Aug 10, 2011 9:53 pm    Post subject: Element spacing Reply with quote

Hi Folks: New here

I have a back ground in ham radio and have built a few home brews, mostly sucessful but have encountered the odd flop, just by experimenting.

My question is:

I want to build a multi-band RX (only) antenna that would capture the same as a Discone. Many told me just to go buy a new discone. How easy is that? IMO that certainly takes away from the hobby of learning designing and building. Would I save any money? Who knows and in some cases who cares !!! ???. It's like a long trip. Is it the destination or the trip itself? So now you know where my intention is.

I'm planning on building a simplified version (based on MY design) of a multiband RX antenna that covers VHF, UHF, 220MHz and 900MHz trunking.

Aside from creating element that may be "fatter" to allow a more broadband capture, my question would be how much spacing between elements. Is there a hard and fast rule via formula.

I can understand gain between elements for a yagi whether for TX or RX but for simple local RF reception (local means within 50+miles).
But how close dare I place elements? I'm also planning on image or counterpoise
Thanks for any help
Back to top
View user's profile Send private message
JerryJ
Antenna-Theory.com Newbie


Joined: 10 Aug 2011
Posts: 2
Location: Ontario

PostPosted: Thu Aug 11, 2011 11:03 am    Post subject: Reply with quote

I'm just redefining my question
Since this is only an Rx antenna, with never any intention of Tx, I realize that not so much is critical. However, I want to do the best I can for the design prior to build.

If I use metal rods, copper, aluminum, for example, "touching each other" then we know that the elements in essence would become one "solid mass"
If, in theory, I have a series of plastic coated wires acting as those vertcial elements, touching each other, while they may be isolated and insulated, I sense their proximity to each other may be too close. And, that is where my question beigins. How much separation from each other should they be? Or, does it really matter, as long as they are separated?

I suppose one of my main reasons for asking this question is to allow my Rx antenna to be considered being a 50 Ohm antenna, used with a 50ohm transmission line (RG58) and the reciever itself
Thanks
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    antenna-theory.com Forum Index -> Questions Related to Antenna Theory All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group