Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: Miata / MX5 BC antenna for 2 meters?  (Read 740 times)
G8OSN
Member

Posts: 12


WWW

Ignore
« on: March 13, 2001, 02:57:18 PM »

Hi,

Has anyone tried adapting the broadcast antenna on a Mazda Miata (or MX5 in the UK)to serve a dual purpose as a 2m 1/4wave and still for broadcast radio.

It looks easy- a trim to lenght and a coax relay to select the coax. In fact, too easy- which is why I asked the question ;-)

73

Brian
G8OSN
Logged
AF5II
Member

Posts: 6


WWW

Ignore
« Reply #1 on: March 16, 2001, 12:23:43 AM »

    Well Brian I wouldnt advise that unless you installed some device to keep RF from going back to the AM/FM radio in the car.  If you don't as soon as you key up you will fry the cars radio.  And as for a device to stop the the RF from going back to the AM/FM, I've never heard of such a device but somebody probably makes one.  I'm sure your not the first one with that idea.

John Critz
Logged
G8OSN
Member

Posts: 12


WWW

Ignore
« Reply #2 on: March 19, 2001, 08:06:21 AM »

Hi John,

That is why I planned on using a coax relay to select whether the aerial was switched to the Tx or BC RX. Do you not think this would provide enough isolation? I could also include a 145MHz 1/4 wave coax length in the BC Rx line, with some back to back diodes as well. Any stray RF down the coax would turn on the diodes and the 1/4 wave line would then present a Hi Z to the unselected relay port with the diodes limiting any 145 MHz RF into the BC Rx. That just seemed a bit over the top.

Any comments appreciated.

73

Brian
G8OSN
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!