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

donate to eham
   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: window mount antennas  (Read 2147 times)
K1QQQ
Member

Posts: 281




Ignore
« on: August 30, 2015, 02:53:43 PM »

What are 'window mount' antennas ? They stick to a window but the RF passes through the glass ? It would seem it would be a resistor. (the technology ?)


--- Otherwise it would seem more popular for higher frequency bands. (maybe it is popular)
Logged
K0BG
Member

Posts: 10248


WWW

Ignore
« Reply #1 on: August 30, 2015, 03:03:47 PM »

The reason glass mount antenna don't work well on modern vehicles, is because the glass in almost every vehicle nowadays, is passivated. Which means, it has metallic particles in the glass for two reasons. First, to reduce the heat load from the sun. Less heat, less AC, hence better fuel mileage.

Secondly, vehicles are exempt from Part 15 of the FCC rules and regulations. However, they're required to do the best they can to stay within the rules. Passivation acts as a shield, and helps keep the RF generated by modern vehicle electronics, inside the vehicle.

Enough said!
Logged

G8YMW
Member

Posts: 750




Ignore
« Reply #2 on: August 30, 2015, 06:27:48 PM »

On glass aerials work (using that term very loosely) by capacitive coupling but that is upset by the metallic particles.
You might get away with a half wave  2 metre aerial as that will not need a ground plane but HF needs tha car's bodywork as the other half of the aerial
Logged

73 de Tony
Windows 10:  Making me profane since March 2017
W8JX
Member

Posts: 13268




Ignore
« Reply #3 on: August 31, 2015, 04:41:27 AM »

I have used them with deeply tinted glass on a Suburban and they worked better than I expected.
Logged

--------------------------------------
Ham since 1969....  Old School 20wpm REAL Extra Class..
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!