A Copper-Tubing Slim-Jim Radio Antenna For VHF 2m.
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- Опубликовано: 23 июл 2024
- Building the Slim Jim antenna out of copper tubing for VHF 2m FM. Reception test with the Icom IC-251. I will test transmission in a future video!
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I'm building one at present, so this was useful, thanks.
using a centre punch will keep the drill start point accurate and in place
Hi Gil - try moving the feed point to optimise the SWR match. Use sliding bracketry to find this point before redrilling!
Yes, I just didn't have the time...
Hi Gil,
Since you make many projects, get a set of center drills that are used with lathes. They are extremely rigid and use them to make a dimple before using your drill bit. Enjoyed the video. 73 WB3BJU
You have to put the 50ohm feed point higher to have a better swr
Congratulations on the construction video, they are not easy to make!
Thanks.
Congrats from EA2EFL, north Spain
Thanks.
That looks so easy to build! I tend to have issues getting my roll up slim Jim's to resonate so I am gun shy about manufacturing one of these.
Try, not much to lose...
I'd probably make one from half inch copper pipe, There is this really easy solder to use, quick solder paste, can solder all joints and connections with it. I just use a food torch, it works with minimal heat. In reverse as well so you can just heat it back up and move/re-adjust things without hassle of regular solder. Also, personally I prefer to go with BNC as so239/pl259 commonly used yet not actually rated for 2 meter on antenna side with whatever proper matching connection on other... Then shine her up nice and slap a coat of clear coat so it does not oxidize. =)
Sounds good, I do want to make a copper tubing one for 6m...
That's good.
Excellent video....Thank you for that....When you say RF choke do you mean a balun? if so, what value? 1:1? thank you sir and thumbs up.
Just a bunch of toroid cores on the cable as seen in the video, of coiling the coax on a plastic cylinder. You could use a 1:1 balun I guess..
Theo T You can make an RF choke by using a stack of ferrite beads on the outside jacket of the coaxial cable being used. WB3BJU
salut gil...looking at this video, i was very surprised when you contacted CHRISTIAN, F4HIP from dept 45, which is a good friend of mine, and also..... A BIG ANTENNA BUILDER !!!
ha ha ha !!, in particular on 446 mhz before he became a ham... beautiful 12 to 14 éléments home made antennas, perfectly adjusted on the band !!!!...
Le monde est petit!
saya suka sekali antena ini
I got the slimjim from n9tax. So in what direction does it radiate? perpendicular to the side or in line?
Perpendicular.
@@RadioPrepper thank you
Hey Gil what is your thoughts on the yagi antenna?
Good performing antenna..
Ottimo Lavoro amico mio...
'73 de Giuseppe iz0gzw qrp.
Neither the take off angle nor gain you give is accurate or meaningful. The Slim Jim actually has less gain than a J-pole, which is not that reliable a pattern to start with.
I think the call was RSS? I think that is the Russian callsign for the ISS in Space.
RRS.. Sorry. Not the ISS.
144.8 must be the ISS
It was a new French network, RRS.
145.800 is ISS repeater downlink
Yes, but that wasn't it...
@@RadioPrepper might be late to the party but there is a french repeater network called RRF, most of them operate on VHF
Right, I've been on that network...
Your statements about radiation angle and gain are not correct. The Slim Jim does not have a lower take off or radiation angle. If anything a Slim Jim has a lower gain than a J-pole. Neither antenna is a very good choice for an antenna. A Ground plane makes a more reliable antenna.
There is lots of debate about that... Do you have links I can check out?
@@RadioPrepper, I have simulations that I ran. I can send you the files. The radiation or take off angle are the same, they should be, they are both the same length.
NISSEI RS40 misure 2 ROS without antenna connected... AHAHAHAHA.... Impossible to do a real ROS misuration with this rosmeter...
Indeed it never worked!