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Homebrew 2 Meter Antennas

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Community Veteran
Posts: 1,886
Registered: ‎05-04-2007

Homebrew 2 Meter Antennas

I know there are a few of us on the forum who are indeed Ham radio operators or are involved with radiocommunications - I've been licensed since 1992 with my G7 callsign
As I'm in rented accommodation, installing a full-scale scaffold pole with lots of antennae dotted around the garden is a bit of a no-no, not to mention SWMBO wouldn't be impressed, so I'm now relegated to using a Yaesu VX-170 Handie in the car with a nice commercial 2M whip on the back - My Dual band 2M/70cm Yaesu FT8500 decided to die on me with the VHF output. Because the rig is 7 or 8 years old, I've been told it would be prohibitively expensive to repair, even though the UHF side is fine Sad
I remember in my first days as a ham, a friend of mine, Keith G0PTT helped me to build a variation on the "J" Pole design, however, it looked more like a complete loop with a tuning stub made from threaded rod and a nut soldered to the bottom part of the J.
I know there are loads of designs out there on the net, but I wondered if someone has any ideas on something simple and small for 2M with a reasonable amount of gain that I can either screw to the side of the house facia mounted on 1/2" PVC tubing or hide up in the loft and run some RG58 into the Garage so I can sit in the garage, plug the handie in and have decent QSO. I have access to plenty of 3/8" chromed copper tubing, 1/2" PVC pipe and RG58 coax and can build to any given drawing,, I know I should be able to do this myself, but it has been a long time and I can't find my antenna design book..
Cheers,
Roger - G7LMY
29 REPLIES
Community Veteran
Posts: 5,994
Thanks: 49
Fixes: 4
Registered: ‎16-02-2009

Re: Homebrew 2 Meter Antennas

Well a simple Slim Jim type would be easiest but like you I haven't seem my antenna book for a LONG time  Grin
But depends on the gain you need. They are about 3-5Db from memory (not the best source  Smiley)
Ken GM1JLP (Licensed in '82 I think it was  Shocked)
Not actually active on radio for quite a while (But I was/am the author of TPK-7 for Dos and Winp-7 for Windows going back to the late 90's)
Community Veteran
Posts: 1,886
Registered: ‎05-04-2007

Re: Homebrew 2 Meter Antennas

Hey Ken Smiley
That's exactly what it was now you've mentioned it.. a slim jim!! I had one in my early days and had a old converted fire service storno handheld
And I also used to use TPK-7 and Winp-7 on my packet days, that's when I was living at home and could pretty much do what I wanted lol
Now looking at slim jim designs....
73 OM DE G7LMY
Rising Star
Posts: 2,761
Thanks: 41
Registered: ‎30-07-2008

Re: Homebrew 2 Meter Antennas

I thought I still had my copy of FC Judd's (G2BCX) Two Metre Antenna Handbook, but it seems to have vanished. This is the clearest version I can find on t'internet:
http://www.nrgkits.co.uk/workshop/slimjim.htm
Good luck.  Cool
Remember you're unique - just like everyone else
Community Veteran
Posts: 1,886
Registered: ‎05-04-2007

Re: Homebrew 2 Meter Antennas

Cheers for that - that seems to be the clearest yet. however it mentions using a balun, but I seem to recall, we didn't use one on the original and it lasted for quite some time..
I took it down when I bought a commercially available 5/8 wave, but my father in his infinite wisdom in not knowing what it was threw it away Sad
Community Veteran
Posts: 3,488
Registered: ‎02-10-2008

Re: Homebrew 2 Meter Antennas

I was going to mention the slim jim too - and my Rad Com Handbook says it has a gain of about 2.5dBi - but the handbook also shows a modified version with base loading coils which increases the gain to 6dB ( Rad Com Handbook 7th edition page 14.51.
73's
Mal
GM6ADP - lapsed 
Community Veteran
Posts: 1,886
Registered: ‎05-04-2007

Re: Homebrew 2 Meter Antennas

Cheers for that too Mal Smiley
At least I have plenty of information to work from now. if I remember, I'll take some photos of the finished product.
Rising Star
Posts: 2,761
Thanks: 41
Registered: ‎30-07-2008

Re: Homebrew 2 Meter Antennas

Please do remember! It might inspire me to resurrect my IC02E, which hasn't been powered up for quite a while.  Wink
Remember you're unique - just like everyone else
Community Veteran
Posts: 1,886
Registered: ‎05-04-2007

Re: Homebrew 2 Meter Antennas

HIHI
Sure thing.
I think I still have a ICOM IC-2E (With the thumbwheel tuning) kicking about somewhere too - will be ok for packet/ simplex work, but no good for the repeaters now as they have done away with the 1750Hz tone burst access and replaced with CTCSS (71.9Hz for Hampshire) which is much better as I remember during some really good atmospherics you could end up talking through 2 repeaters at a time!!
Oh... and for those reading this are wondering what on earth HIHI means, it's the ham equivalent of LOL, or in the morse days .... /.. /.... /.... /..
Community Veteran
Posts: 5,994
Thanks: 49
Fixes: 4
Registered: ‎16-02-2009

Re: Homebrew 2 Meter Antennas

Quote from: mal0z
GM6ADP - lapsed 

I always thought about lapsing mine, but just let them keep taking the £12 every year, then last (2 years ago?) they sent me a LIFETIME license... Nice of them since I had been paying for over 20 years by then  Wink
So I still have the callsign but haven't activated a rig for about 7 years, still have a Yaesu 780 sitting on the shelf gathering dust, was never much 70cms traffic up here (don't know about now though), I have my 480 to a mate to fix about 10 years ago and haven't seen it (or him) since  Sad
Grafter
Posts: 19,757
Registered: ‎30-07-2007

Re: Homebrew 2 Meter Antennas

easy when you know how http://www.hamuniverse.com/slimjim.html Cool
edit put bracket back at end ]
Community Veteran
Posts: 3,488
Registered: ‎02-10-2008

Re: Homebrew 2 Meter Antennas

@4candles -  IC02E  memories of a great little rig, but I used a Trio VHF SSB/FM mobile.
@Biker - I revitalised my license about 10 years ago - but let it lapse again.
I've heard of the lifetime license - so may revitalise it again, Especially now we cab use HF,
Although I was a professional radio man with Marconi and used ships HF kit under supervision from the radio officer, I never managed to get arround to doing my morse test.
Community Veteran
Posts: 1,886
Registered: ‎05-04-2007

Re: Homebrew 2 Meter Antennas

Quote from: biker955
Quote from: mal0z
GM6ADP - lapsed 

I always thought about lapsing mine, but just let them keep taking the £12 every year, then last (2 years ago?) they sent me a LIFETIME license... Nice of them since I had been paying for over 20 years by then  Wink
So I still have the callsign but haven't activated a rig for about 7 years, still have a Yaesu 780 sitting on the shelf gathering dust, was never much 70cms traffic up here (don't know about now though), I have my 480 to a mate to fix about 10 years ago and haven't seen it (or him) since  Sad

I think you still need to "check in" with OFCOM every 5 years to keep your lifetime licence active IIRC..
Just been back to the parents, took down my old Antenna - was a fibreglass comet dual band, and has certainly stood the test of time, although some t-cut and some laquer or wax polish will bring it back to looking new again Smiley
EDIT: I'm also looking into the new forum structure with the rest of the team - do you think a Ham forum would get used much?
Community Veteran
Posts: 5,994
Thanks: 49
Fixes: 4
Registered: ‎16-02-2009

Re: Homebrew 2 Meter Antennas

Doubt it myself not much to chat about  Grin
Community Veteran
Posts: 3,488
Registered: ‎02-10-2008

Re: Homebrew 2 Meter Antennas

I doubt a solely Ham radio forum, but maybe a radio one which could include wifi perhaps ?. As many people here seem to have a rather vague idea how radio works  - including some IT people Wink