Air Traffic Monitoring > Feed Setup Pictures

How to build a J-Pole antenna ?

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pinko:
Hi!

I need a J-Pole antenna to use with a Uniden 105XLT airband scanner. Where can I find a guide with the information to make one ?
I know there are a lot of guides but I would like to get one optimized for airband.

Thanks in advance for any help.  :D

Jason:

--- Quote from: pinko ---Hi!

I need a J-Pole antenna to use with a Uniden 105XLT airband scanner. Where can I find a guide with the information to make one ?
I know there are a lot of guides but I would like to get one optimized for airband.

Thanks in advance for any help.  :D
--- End quote ---


This is the link I used to build my copper J-pole:

http://larc.hamgate.net/J_Pole_2_meters.htm

I tuned it to these specifications:
Copper J-Pole

Frequency {MHz}         125
Total Length {in.}    70.810
To Notch {in.}           23.652
Stub {in.}               3.504
Spacing {in.}            3.504
Diameter {in}           0.584

Results on this page: http://www.liveatc.net/forum/viewtopic.php?t=651

Regards,
Jason

Lezam:
Howd you mount it onto the roof?

Jason:

--- Quote from: Lezam ---Howd you mount it onto the roof?
--- End quote ---


Simple radioshack mounting brackets.

I think I have the 8" ones, but I can't remember.  I think they also come in 6" and 12."

Jason

pinko:

--- Quote from: Jason ---

This is the link I used to build my copper J-pole:

http://larc.hamgate.net/J_Pole_2_meters.htm


--- End quote ---


Thanks a lot for your help Jason!

I'm from Europe, so I don't understand some technical terms, so can you please tell me what's the meaning of:

RTV ?
Braid ?
FLUX ?
Feed Point ? VSWR ?

BTW, which type of coax cable should I use ?

Thanks again!  :D

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