Thread: Why Antenna Tuners Aren't Necessarily Useful for Shortwave Listening - Question Shortwave Listening (SWL) Antenna Tuners - Do You Have An Opinion ?
View Single Post
  #34   Report Post  
Old March 13th 06, 01:41 AM posted to rec.radio.shortwave
Bob Miller
 
Posts: n/a
Default The Next Step - The Low Noise Inverted "L" {Random Wire} Antenna - Question Shortwave Listening (SWL) Antenna Tuners - Do You Have An Opinion ?
On Sun, 12 Mar 2006 22:28:19 GMT, Telamon
wrote:

In article ,
wrote:

On 12 Mar 2006 01:08:39 -0800, wrote:

Hey, you asked for opinions in your first post
of the thread. If you don't like my opinions, thats
too bad. An antenna is an antenna is an antenna.
Do you think when I switch from a SWL to a ham band,
I need to switch antenna types? LOL...You guys kill me..
MK

Well how can your receiver work with an antenna made for transmit 8-}

Basically (theoretically) an antenna made for transmit is just as
suitable for receive. This is called reciprocity.

This concept falls apart two ways in practicality:
1. The transmit situation has to handle power the receive situation does
not so for transmit the antenna elements need to be "beefier."

Most transmitting antennas use wire about the same size as what's
found in receiving-only antennas, 14 or 16 guage, maybe 12 guage for
full legal power.

2. A less than full size antenna made resonant may work very well for
transmit but for receive not as well. Less than full size for receive
lowers the antenna efficiency.

I seriously doubt you could hear the difference between a full size
antenna at frequency, and one slightly shorter for space
considerations.

bob
k5qwg
Reply With QuoteReply With Quote