Attempting 2m SSB Tomorrow Morning

So, I've got my stuff together and am going to see what kind of activity I can at the very least receive tomorrow morning (apparently between 8am and 9am is good) from Red Hill (QF44NP). I may even throw out some CQs and see if anyone is listening for a 5W station.

The photos show the gear I'll be trying with:
1) The 2m dipole I made awhile back for 2m SSB use from home (was mounted on an TV antenna mast). The elements being made from aluminium tubing and the rest from PVC tubing. This has a nice flat 1:1 SWR across the whole 2m band and also a good low SWR one the 70cm band (a surprise to me). The first antenna I made was similar to this but made such that it had an extra elbow join in it so that when mounted on a mast it was vertical – with the focus being 2m FM repeater access.
2) I've attached (with electrical tape minde you) the dipole to a simple bit of electrical conduit as a quick and easy mast. This _just_ fits inside my land cruiser and I'll simply pull it out tomorrow morning and strap it to my bull bar. The idea here is simple and quick to deploy just to be able to give this a go.
3) I'll be using my trusty little Yaesu FT-817ND which I've used for a couple of field days and had good success with.

So in theory, I'm all set. The only gotcha will be me getting out of bed early enough. But if I do manage that, not only will I get to participate maybe in some 2m SSB, but I'll also get to work earlier. 🙂

(Now I've just got to try and get to bed at a reasonable time – but about to go and write up the log from last weeks 2m FM Lunchtime Net seeing that it's on again tomorrow.)



4 thoughts on “Attempting 2m SSB Tomorrow Morning

  1. G’day Stan,Thanks for joining the lunch time net yesterday, it was great to have you there.Yup, these dipoles are a nice and easy and I think reasonably strong design. The very first antenna I built was one of these (still have it) in a vertical orientation. I chose this after looking around the web and finding everything more complicated than I wanted. So I went back to basics.The idea is, it’s just a dipole for 2m. So the theory of a dipole is easy, but how to build a relatively small one for VHF. Well, it’s easy!!What you do is go down to Bunnings and and grab yourself some 25mm aluminium pipe – 1.2m should be enough. Also ideally you want a tube cutter, but a hack saw will obviously do too. You also then want to go to the plumbing section and grab yourself a PVC T piece that the aluminium pipe will fit; and a piece of PVC pipe that will fit the T connector.So the idea is you’re creating a 1/2 wave dipole, so to figure out our starting length we do:300 / 146 = 2.05mNo we want half of that (so that we have a 1/2 wave):2.05 / 2 = 1.025So 1.025m will be the ultimate full length but then we need to split that in to two legs. So ultimately we want two lengths of the aluminium tubing which are 51cm long. So cut those two lengths.Join those two lengths with the PVC T connector. Then either screw them or pop rivet them in. Oh, I also suggest you drill a hold in the top of the T-piece as you want the coax to come up and out there.Alright, so your now at a point of having two 51cm lengths of aluminium tubing joined with a PVC T connector – which has a hole at the top drilled in it. You now need to thread one end of you coax through that other length of PVC tube you have (before you connect it to the T connector) and then through the hole in the T connector. Pull it a good way through and then join the PVC pipe to the T connector – either again with a pop rivet or PVC glue/tape etc.Now you need to strip the coax and connect the inner conductor to one side, and the shield to the other. How you can connect it can be tricky as soldering to aluminium needs a lot of heat. What I did instead, was solder a good length of bare wire to the centre conductor and then another piece to the shield. I then wrapped the wire from the centre tightly around one side and then the other piece tightly around the other side.At this point check the conductivity to make sure you have good contact between the coax and the arms and also make sure there is no short between the two arms.Then get some good weather proof tape and wrap tightly over where the wire is wound onto each arm and where the coax comes out of the T piece. Now it should be all nice and covered and you can be sure of pretty reasonable contact to the aluminium.Again, check the conductivity to make sure the taping didn’t mess anything up.Now we just need to cut the coax coming out of the PVC tube and terminate it with either a PL-259 connector to go straight into a radio; or you can cut it nice and short and put a N socket connector or SO-238 connector so that you can wire it up as required. (An option is to even just put a BNC, SMA or other connector on it so that you can hook it up to a handheld.)Again, check the conductivity to make sure you attached the connector correctly.Anyway, once that is done we have to tune it. This dipole due the big element is pretty broadband and will also work on 70cm to some degree. The measurements above I based on 146MHz for the middle of the band, however due to the large element (and things such as Velocity Factor) it will need trimming.This can be done with an SWR meter (or an antenna analyser – CRARC has one) and taking an _equal_ amount of each end after each reading where the SWR is too high until you get down to a 1:1. Keep in mind though, you trim too far and it’s hard to add back on.Anyway, that’s the gist of it. Not sure how clear the above instructions are – I really should write something up with photos etc. – but this thing is easy and cheap to build and you can do it in half a day or less – including tuning.Also, it can be good to file the ends you have cut to ensure a nice clean radiated pattern. Also can be nice to place PVC caps on the end to make it more weather proof – this also includes the end that the coax comes out of (just drill a hole in it first).Good luck, and if you have any questions just let me know. Also, let me know if you succeed.Cheers,VK1FOTO

  2. Hey Stan,<div><br></div><div>Ah, appears I got the calls wrong – sorry about that. But as for Lyndsay not knowing the flow of a net, that's not a problem. I definitely encourage him and you to try again next week. All are welcome any time. :)</div> <div><br></div><div>Good work on your antennas, and when you get your blog up and going let me know. I'd be keen to link to it and also to read it.</div><div><br></div><div>2m SSB is good fun and you don't need much to have a bit of fun if you can grab a good location. I highly recommend it, and the summery Field Day that is coming up is a great start – it was the first thing I did with 2m SSB.</div> <div><br></div><div>Also, I'd be interested to hear more about your portable 3el beam – if by portable you mean it can be easily transported (like on a plane perhaps)?</div><div><br></div><div>Cheers,</div><div>VK1FOTO<br> <br></div>

  3. <html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="; xmlns=""&gt; <head> <meta http-equiv=Content-Type content="text/html; charset=utf-8"> <meta name=Generator content="Microsoft Word 12 (filtered medium)"> <!–[if !mso]> <style> v:* {behavior:url(#default#VML);} o:* {behavior:url(#default#VML);} w:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} </style> <![endif]–> <style> <!– /* Font Definitions */ @font-face
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    {page:Section1;} –> </style> <!–[if gte mso 9]><xml> <o:shapedefaults v:ext="edit" spidmax="1026" /> </xml><![endif]–><!–[if gte mso 9]><xml> <o:shapelayout v:ext="edit"> <o:idmap v:ext="edit" data="1" /> </o:shapelayout></xml><![endif]–> </head> <body lang=EN-AU link=blue vlink=purple> <div class=Section1> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’>I hope this gets to you not overly confident with ‘Posterous’ as yet.<o:p></o:p></span></p> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’></span></p> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’>My blog page is <a href=""></a><o:p></o:p></span></p> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’></span></p> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’>Starting with 3el 2m beam, if it is made with the right size material it could well be transportable on a plane, finished testing and now making one for Lyndsay vk1flis so he can take it to the mountains with him at Christmas by rebuilding it I can get some photo’s to post as well.  <o:p></o:p></span></p> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’></span></p> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’>I am also interested in your study timetable something I should be considering as well, a well planned timetable is the way to go then you are not studying subjects that are of interesting but not really required to pass the exam.<o:p></o:p></span></p> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’></span></p> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’>Hope you are over your Flu.  <o:p></o:p></span></p> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’></span></p> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’>Catch you on the air.<o:p></o:p></span></p> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’></span></p> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’>Stan<o:p></o:p></span></p> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’>VK1 FSTJ<o:p></o:p></span></p> <p class=MsoNormal><span style=’font-size:11.0pt;font-family:"Calibri","sans-serif"; color:#1F497D’></span></p> <div style=’border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm’> <p class=MsoNormal><b><span lang=EN-US style=’font-size:10.0pt;font-family: "Tahoma","sans-serif"’>From:</span></b><span lang=EN-US style=’font-size:10.0pt; font-family:"Tahoma","sans-serif"’></span></p></div></div></body></html>

  4. G’day Stan,Yup, that came through – in a kind of odd fashion – but it worked. ;)Look forward to seeing photos of the 3el beam. Seems like a good ideal, because with only 3 elements you should be able to keep the size down and also have an arrangement with a good match – and thereby even simpler to assemble and disassemble.On the study front, I received my new books yesterday so I’ll post up more on my plans shortly. Hope it can be of use to you.Thanks for the well wishes, flu is mostly gone (back at work at least) and so will be on the air this Thursday net for sure.Cheers,VK1FOTO.

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