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Old Apr 16, 2015, 05:42 AM
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Has anyone give a try to make the reflector using aluminium? Like the kind of nice,~4mm thick material used in the helicals found in FPV stores (see picture).
I wonder what kind of aluminium it is (definitely not common alu,not fortal either) and how one could solder the RG316 shield on it .

I am sure it doesn't make any difference in performance over copper, but I really like the looks of it.
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Old Apr 16, 2015, 06:01 AM
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The connector is bolted on the reflector.
So no need to solder on aluminium.
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Old Apr 16, 2015, 07:08 AM
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Quote:
Originally Posted by sjb_rc View Post
The connector is bolted on the reflector.
So no need to solder on aluminium.
I think you are right. Using a bolt sounds like a good idea.
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Old Apr 17, 2015, 03:31 AM
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Quote:
Originally Posted by sjb_rc View Post
The connector is bolted on the reflector.
So no need to solder on aluminium.
If needed, soldering fluids for aluminium also exists and can be bought at shops with electronic components. But bolting it's definitely a good idea.
Roman
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Old Apr 17, 2015, 06:06 AM
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I 've seen some videos on youtube on how to solder aluminium, by using high temperatures (and a torch instead of iron). But this would damage the frigile RG316.

So, anyone knows what particular type of aluminium is this? Probably just for academic knowledge - chances are it will be too expensive to get and to work with it.
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Old Apr 17, 2015, 08:30 AM
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Quote:
Originally Posted by dk31 View Post
I 've seen some videos on youtube on how to solder aluminium, by using high temperatures (and a torch instead of iron). But this would damage the frigile RG316.

So, anyone knows what particular type of aluminium is this? Probably just for academic knowledge - chances are it will be too expensive to get and to work with it.
I have in my drawer special solder fluid for aluminium, but my drawer is probably too far from you .
It's kind of chemical, which applied to aluminimu covers it chemically with thin layer of zinc and zinc surface then can be soldered with normal solder at 300C.
But again - bolted connector will probably be the best...
Roman
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Old Apr 17, 2015, 09:07 AM
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Quote:
Originally Posted by dk31 View Post
I 've seen some videos on youtube on how to solder aluminium, by using high temperatures (and a torch instead of iron). But this would damage the frigile RG316.

So, anyone knows what particular type of aluminium is this? Probably just for academic knowledge - chances are it will be too expensive to get and to work with it.
You can use the High Temperature process (or the zink chemical plate) process to 'tin' the hole, and then use 'normal' soldering techniques.
Aluminium comes in many grades, from soft through to Very hard, depending on how it is produced ( including heat treatments) .
The platters of Old 5 inch Hard Drives used to be made of tempered aluminium, and the modern ones may well be, I havn't stripped on in years
Mike
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Old Apr 18, 2015, 01:53 AM
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Thank you Mike. I will search for an old hard drive to see what I can get of it.
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Old Apr 23, 2015, 12:38 PM
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7 turn helical . waiting for copper strip to make impedance matching.
thanks to IB CRAZY.
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Old Apr 30, 2015, 09:27 PM
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i know this is a bit off topic but... how hard would it be to build a 430-440 mhz yagi for long range control ?
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Old Apr 30, 2015, 09:38 PM
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Ibcrazy has a thread for that. And not hard.
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Old May 01, 2015, 01:48 AM
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Quote:
Originally Posted by quadcopter007fpv View Post
i know this is a bit off topic but... how hard would it be to build a 430-440 mhz yagi for long range control ?
You can buy off the shelf yagis for this frequencyband and you also will find tons of DIY videos and projects by googeling for "70cm yagi". The band you refer to is the 70cm HAM radio band hence there are more antennas available for this band than for the other bands we usually operate on.

HTH

Markus
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