Dipole mount for weather satellite reception
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The purpose of these files are to provide a means of mounting two aluminium rods to a length of 32mm waste pipe. Why?…
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The purpose of these files are to provide a means of mounting two aluminium rods to a length of 32mm waste pipe. Why? To form a dipole antenna for the reception of NOAA satellite data on the 137MHz band using an SDR receiver.
Basic construction of the dipole is described by Adam-9A4QV in his blog, here http://lna4all.blogspot.co.uk/2017/02/diy-137-mhz-wx-sat-v-dipole-antenna.html
What I required was some sort of mounting arrangement so that I could fix the dipole to a length of wood (to enable me to raise it into the air) and also rotate it in order to align the rods in a N-S direction. I also wanted something reasonably modular and portable.
The basic rod mount is essentially my copy of Tysonpower's thing but I went a little bit further by adding a method of fixing the choc-block connector as well as a mount for a coax connector (SO239) and a cover for this which slips over a 1m length of 32mm white plastic waste pipe.
I used ABS for this project as the unit will sit outside and I didn't want PLA to start deforming should the sun start to shine here in the UK :-)
Print settings are not too critical - I used a layer height of 0.25mm and an infill of 20% on my Nophead Mendel90.
Post-Printing
Assembly
Putting each of the parts together should be reasonably straightforward, a description of each file follows.
**BODY**This piece goes over the top of the waste pipe - a firm fit but not too tight on 32mm pipe. There are three holes at the lower end which will take self tapper screws in order to fasten it to the waste pipe. At the upper end there are more holes - two to enable access to the choc-block connector (I used one with a rating of 30A which will accept both 4mm rods and 6mm rods). The hole between these two access holes is there to enable the use of the hex key, used to fasten the choc-block with a 20mm M3 bolt which screws into a nyloc nut pressed into the back side of the body component. The other holes in the body align to the TOP component and take another three self tappers to fasten the top and body to the waste pipe.
4mm plate and 6mm plate
The plates consist of a top part and a carrier part - one if you want to use 4mm rods and another for 6mm rods. (I tried both but prefer the 4mm rods as they are more 'workable' than 6mm. I found it impossible to secure the choc-block when using 6mm rods but this does not actually matter). The triangular plug and socket arrangement is there simply for alignment purposes - definitely not a tight fit in order to give some wiggle room.
Bottom Cap
This takes an SO239 socket to which the coax is connected from the dipole elements. The cap then push fits onto the bottom of the waste pipe and is secured by three self tappers. You do not need the bottom cap of course and can just take the coax directly to your SDR receiver. However, I wanted to have the option of removing the coax cable in a quick and easy way.
Cover
This goes onto the waste pipe BEFORE you attach the coax to the SO259 socket and bottom cap. Its purpose is to give a bit of weather protection and of course, if you are not using a coax socket at the bottom of the waste pipe, you don't need the cover.
Category: Physics & Astronomy