wire antenna
 

i have a cable that is used as a wire antenna, how to mount it on a
pcb, the inner conductor should be connected to the feed line, the
outer conductor should be connected to the ground, but what happens to
the outer conductor, should i leave it in parallel with the inner and
of the same length or what? the antenna is a monopole

regards

Try soldering a female bnc connector on the pcb
then you can attach an antenna at will

Reminds me of the old quote "Fire at Will" - but Will ducked just in time.

"redhat" wrote in message
ups.com...
i have a cable that is used as a wire antenna, how to mount it on a
pcb, the inner conductor should be connected to the feed line, the
outer conductor should be connected to the ground, but what happens to
the outer conductor, should i leave it in parallel with the inner and
of the same length or what? the antenna is a monopole

regards

"redhat" wrote in message
ups.com...
i have a cable that is used as a wire antenna, how to mount it on a
pcb, the inner conductor should be connected to the feed line, the
outer conductor should be connected to the ground, but what happens to
the outer conductor, should i leave it in parallel with the inner and
of the same length or what? the antenna is a monopole

there is no such thing as a monopole antenna... only dipoles where the other
half probably isn't where you want it to be!

there are two wires one for feed the other for ground, should they have
the same length?
http://www.geocities.com/aezzat3/monopole.jpg

monopole? you are looking at the end of a piece of coax cable that has been
trimmed to show the internal structure.

"redhat" wrote in message
oups.com...
there are two wires one for feed the other for ground, should they have
the same length?
http://www.geocities.com/aezzat3/monopole.jpg

yes, can't i use a coax as an antenna by trimming its end at the
calculated length lamda=C/f where for example length of wire = 1/8
lamda

redhat wrote:
yes, can't i use a coax as an antenna by trimming its end at the
calculated length lamda=C/f where for example length of wire = 1/8
lamda

Yes But unless lambda is very short it would be a waste of time and a
lot of money compared to using the coax for it's intended purpose and an
attached antenna made from separate materials.

Dave WD9BDZ

yes, almbda is short , so should the two wires have the same length?
the ground is connected to the circuit's ground but what about the
other end of the wire?

yes, you can do that. normally you just strip the shield back and leave 1/4
wave of the center conductor exposed. that makes a reasonable 1/2 wave
dipole as long as the shield is at least 1/4 wave long. you can also add
aluminum foil or fold the shield back for 1/4 wavelength over the insulation
for slightly better results.

"redhat" wrote in message
oups.com...
yes, can't i use a coax as an antenna by trimming its end at the
calculated length lamda=C/f where for example length of wire = 1/8
lamda