A Copper-Tubing Slim-Jim Radio Antenna For VHF 2m.

[@sv2tcb]

You have to put the 50ohm feed point higher to have a better swr

[@vacuumfireradio253]

Hi Gil - try moving the feed point to optimise the SWR match. Use sliding bracketry to find this point before redrilling!

[@RadioPrepper]

Yes, I just didn't have the time...

[@brianmatthews7607]

using a centre punch will keep the drill start point accurate and in place

[@DonDegidio]

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

[@Jerrythenerdful]

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.

[@qrpradiolistner7232]

Ottimo Lavoro amico mio... '73 de Giuseppe iz0gzw qrp.

[@acestudioscouk-Ace-G0ACE]

I'm building one at present, so this was useful, thanks.

[@mrtonicsvls3624]

NISSEI RS40 misure 2 ROS without antenna connected... AHAHAHAHA.... Impossible to do a real ROS misuration with this rosmeter...

[@RadioPrepper]

Indeed it never worked!

[@aleksandrkhurkhuyanovskiy1878]

That's good.

[@kissingbanditt]

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.

[@RadioPrepper]

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..

[@DonDegidio]

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

[@danamarcy5414]

I think the call was RSS? I think that is the Russian callsign for the ISS in Space.

[@RadioPrepper]

RRS.. Sorry. Not the ISS.

[@keslimmer]

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.

[@RadioPrepper]

There is lots of debate about that... Do you have links I can check out?

[@keslimmer]

@@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.

[@wickensonline]

Congratulations on the construction video, they are not easy to make!

[@RadioPrepper]

Thanks.

[@erpim]

Congrats from EA2EFL, north Spain

[@RadioPrepper]

Thanks.

[@AztechStation]

saya suka sekali antena ini

[@pascalf5pnp310]

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 !!!!...

[@RadioPrepper]

Le monde est petit!

[@Bro-f3h]

Hey Gil what is your thoughts on the yagi antenna?

[@RadioPrepper]

Good performing antenna..

[@joczo97]

144.8 must be the ISS

[@RadioPrepper]

It was a new French network, RRS.

[@dennis8196]

145.800 is ISS repeater downlink

[@RadioPrepper]

Yes, but that wasn't it...

[@alebret3]

@@RadioPrepper might be late to the party but there is a french repeater network called RRF, most of them operate on VHF

[@RadioPrepper]

Right, I've been on that network...

[@washingtonstatepicker3460]

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.

[@RadioPrepper]

Try, not much to lose...

[@liquidb7810]

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. =)

[@RadioPrepper]

Sounds good, I do want to make a copper tubing one for 6m...

[@CroPrepper]

I got the slimjim from n9tax. So in what direction does it radiate? perpendicular to the side or in line?

[@RadioPrepper]

Perpendicular.

[@CroPrepper]

@@RadioPrepper thank you