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Another pile of scrap aluminum ?
Topic Started: Monday, 2. October 2017, 17:25 (449 Views)
Bean
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For some time Ive been after a mini beam for 10 & 15m to take out portable , and this atm is the result. Based on Siro SY 27 beam parts the boom will be just over 2m in length and the longest element which is the 10m reflector at 5.37m . Operating height will be only at 5m when out /p but should (?) give a gain of 3dB > 6dB over the 5>20 degree take off angle compared against what I'm running now. For 10 & 15m sub 1.5:1 swr should in practice ( never quite the same going from computer to real life ) be achievable with 11,12 & 4m (?) with a tuner.
Attached to this post:
Attachments: 10mcurrents.jpg (69.13 KB)
Attachments: 10mfarfield.jpg (192.75 KB)
Attachments: 10mswr.jpg (156.61 KB)
Attachments: 15mcurrents.jpg (62.61 KB)
Attachments: 15mfarfield.jpg (192.34 KB)
Attachments: 15mswr.jpg (153.34 KB)
Edited by Bean, Monday, 2. October 2017, 17:27.
CT261685@aol.com
TOTALLY PORTABLE

"Speech is civilization itself. The word, even the most contradictory word, preserves contact. It is silence which isolates."
Thomas Mann (1875-1955)
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Fat Freddys Cat
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26 Charlie Tango 1772

As a neat portable ant, have a look at building this little beauty 10 meter moxon antenna.
You can buy them off the shelf but you will have more fun building it as it's a few hours work at the weekend.

https://www.universal-radio.com/catalog/hamants/6334.html
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Bean
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And does it do 15m at the same time without a tuner or does a 15m moxon do 10m aswell without a tuner ? I tried modelling the 15m moxon as the driven antenna but couldn't get it to work with the open sleeve 10m yagi part ( might be just me )
73
Kevin
CT261685@aol.com
TOTALLY PORTABLE

"Speech is civilization itself. The word, even the most contradictory word, preserves contact. It is silence which isolates."
Thomas Mann (1875-1955)
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Fat Freddys Cat
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26 Charlie Tango 1772

Have a look here, https://www.vortexantennas.co.uk/shop/2-element-moxon-15m-heavy-duty/

Not cheap, i think you will struggle to get a MOXON to run 21 MHz and 27 but the 27 MHz version is small enough and light enough to tote around portable and easy to build.
Have a look here http://www.ac6la.com/moxgen1.html for a Mox generator . A little bit of software that you can down load to your computer and design your own Moxon antenna to your own frequency , it will give you all the sizes and dimensions for cutting up the tube.
Good luck
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Bean
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Dont think your understanding what Im trying to do . One feed line to a compact antenna that would give TEN & FIFTEEN metres with an swr curve below 1.5:1 based on parts from Siro 27mhz beam.A 2element 15m yagi with 2 element open sleeve 10m yagi is easy enough and plans are all over the internet for this type of antenna but the longest element is something like 7m.
73
Kevin
CT261685@aol.com
TOTALLY PORTABLE

"Speech is civilization itself. The word, even the most contradictory word, preserves contact. It is silence which isolates."
Thomas Mann (1875-1955)
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Northern Crusader
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26 Charlie Tango 1760

Bean
Friday, 6. October 2017, 16:25
Dont think your understanding what Im trying to do . One feed line to a compact antenna that would give TEN & FIFTEEN metres with an swr curve below 1.5:1 based on parts from Siro 27mhz beam.
Not going to happen unless you are going to make your own inductors or capacity hats to allow you to shorten the length of the elements and trap for 10m to make it multibanded. Even then its performance is going to be compromised because of the element spacing.
26CT1760 / M0GVZ
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Bean
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Are you saying the results from MMANA-GAL software are false then ? Conor.
73
Kevin
Edited by Bean, Thursday, 12. October 2017, 10:00.
CT261685@aol.com
TOTALLY PORTABLE

"Speech is civilization itself. The word, even the most contradictory word, preserves contact. It is silence which isolates."
Thomas Mann (1875-1955)
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Northern Crusader
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26 Charlie Tango 1760

Bean
Thursday, 12. October 2017, 10:00
Are you saying the results from MMANA-GAL software are false then ? Conor.
73
Kevin
Ah sorry I misread the original post and got it into my head you were wanting it to be no longer than 2m as in the elements. God only knows what was going through my head at the time, probably nothing as usual :D
Edited by Northern Crusader, Thursday, 12. October 2017, 11:26.
26CT1760 / M0GVZ
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Sam WD40
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26 Charlie Tango 747

Just get a Comet-H422 Kevin they work well and you get 40m to
[marq=Left]STOP READING MY CRAP GO GET SOME DX DONE ![/marq]

M0SRW
26-CT-747
IF YA NEIGHBOURS STILL TALK TO YOU GET A BIGGER ANTENNA !

Failure is not an option! BUT smashing it with a BIG hammer is :bash:

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Bean
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To big Sam , although I know they work well. Plus I like making homebrew whether wire or ally tube. Gone abit off original idea atm upto 4m boom and 3elements for 10 , still 2 for 15m though.
73
Kevin
CT261685@aol.com
TOTALLY PORTABLE

"Speech is civilization itself. The word, even the most contradictory word, preserves contact. It is silence which isolates."
Thomas Mann (1875-1955)
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