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591Portable Profile
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Freebander
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Registered: 01-2014
Location: East Anglia
Posts: 65
Karma: 2 (+2/-0)
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Portable Moxon for 20 and 40 mtr


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I have started a winter project, the first part is complete. The Moxon is now tuned for [sign in to see URL], when I first put it up it tuned for [sign in to see URL]. I had to re calculate at [sign in to see URL] to have it resonant at a height of 12 mtr. I planned the frame work so it that it may be possible to use 40 mtr as well for a Portable station. It will be a biggy, with a length of [sign in to see URL] on 1 side. If any one has any views or ideas on this, let me know. I have built several for 10 and 11 mtr, these give SWR 1.5 or better from [sign in to see URL] to [sign in to see URL] without re tuning and work pretty well at around 6 mtrs or more in the air.
Andy 591/Portable

Last edited by Kaosss, 25/Jan/2014, 5:17 pm
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Nik Gnashers Profile
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Freebander
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Registered: 12-2011
Location: Midlands, UK
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Re: Portable Moxon for 20 and 40 mtr


Wow !

That's a beast, wish I had the room for one in the garden at home emoticon

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26CT573 & 26FB973
Kenwood TS50s / RM KL500 / Vortex 11m yagi
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591Portable Profile
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Freebander
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Registered: 01-2014
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Re: Portable Moxon for 20 and 40 mtr


HI Thanks for the comment. Everything I make has to go into the car and then be set up wherever there is space. It is all made in the Kitchen. The boom is 5.8 mtrs long. My garden is only 20ft x 20ft. Takes a bit of planning, but is fun and get a good sense of satisfaction when it all goes well.
Andy


Last edited by 591Portable, 26/Jan/2014, 3:06 pm
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topbuzzuk Profile
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Big Cheese
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Registered: 11-2007
Location: Wiltshire, UK
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Re: Portable Moxon for 20 and 40 mtr


have you got any plans/instructions for the build of the 40m moxon? i would love to try a 45 meter moxon even in a fixed position made from wire

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27/Jan/2014, 12:48 am Link to this post Send Email to topbuzzuk   Send PM to topbuzzuk Yahoo
 
591Portable Profile
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Freebander
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Re: Portable Moxon for 20 and 40 mtr


HI Big Cheese
Here is a download that I use for calculations. very easy to use.
]Moxgen rectangle calculator
Put in the frequency and wire diameter, click the right hand side for feet or meters. I use 12 gauge wire and on [sign in to see URL] it was 400khc too low and had to shorten everything with a [sign in to see URL] setting. I haven't put anything up for 40 as yet, so don't know how much trimming there will be. The boom is 1 1/4 or 32mm 16swg ally, the middle and end plates are 65mm x 220mm x 8mm. To make teh bend, allow enough for the boom and fixing bracket, make a small cut of about 2mm across at the point you want to bend it, i did it in a vice. You will want a boom of about 6mtr and should be ok with 5mtr fihing poles for the spreaders. I have run up to 800 watts through them and it has been fine. Gives a good front to back rejection and nulls out nearly everything on the side of it. Any questions on anything about them, I will try to help, with email and pictures or design tips. Andy

Last edited by Kaosss, 13/Feb/2014, 6:33 pm
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591Portable Profile
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Freebander
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Registered: 01-2014
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Re: Portable Moxon for 20 and 40 mtr




 Just a quick post to close the topic on the 20/40 mtr Moxon. I looked at a 40 mtr build, but it is just too big for me to manage on my own as a Portable station. Maybe one day as a Homebase if I move and have the room.
22/Mar/2014, 3:37 pm Link to this post Send Email to 591Portable   Send PM to 591Portable Blog
 


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