RadioBanter - View Single Post - Why Antenna Tuners Aren't Necessarily Useful for Shortwave Listening - Question Shortwave Listening (SWL) Antenna Tuners

March 12th 06, 11:48 PM posted to rec.radio.shortwave

In article ,
wrote:

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." 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.

Telamon, Thanks for the friendly answer - however, I was aware of
what you mention. My earlier response was just a case of me being
flippant in my response to MK.

When I post whether a new thread or in this case a reply I try to be
informative as this is not like email where a reply would go directly to
you.

Hopefully other people reading the thread get a better idea of
what will work better for them. Besides there is no way for me to know
what you know or what experience you have except for what you explicitly
write and I have to guess the rest.

A level of knowledge a person has is an interesting thing in itself.
Some people are aware of the reciprocity concept and leave it at that
but you can always look at things in a deeper way that modify or even
appear to reverse a rule.

--
Telamon
Ventura, California