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 4m half wave antenna on ebay 
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Post 4m half wave antenna on ebay
http://www.ebay.co.uk/itm/NEW-4-METER-70-71-MEG-1-2-WAVE-BASE-STATION-VERTICAL-ANTENNA/391093671421?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649
I'm putting my sirio on the mast but would prefer a lighter option , i saw the above on ebay, looks like a modified cb antenna ,does anyone know what the antenna is like or even better what the mod is.
Thanks.

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Sun Jul 23, 2017 10:23 am
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 4m half wave antenna on ebay 
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Post Re: 4m half wave antenna on ebay
I would avoid anything mcr666 makes like the plague.

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Sun Jul 23, 2017 11:43 am
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 4m half wave antenna on ebay 
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Post Re: 4m half wave antenna on ebay
Can't be serious? :scratch:
It is a £15 silver rod CB antenna with the top sections removed and a modified base loading coil - good grief.


Sun Jul 23, 2017 11:49 am
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 4m half wave antenna on ebay 
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Post Re: 4m half wave antenna on ebay
G0JUR wrote:
I would avoid anything mcr666 makes like the plague.

Yep ,that is most peoples opinion ,what have you tried of his?
I know his cobwebbs are hit and miss ,i had one of his and wasn't too bad other than the coax he used in the box for the balun.

2E1IIP wrote:
Can't be serious? :scratch:
It is a £15 silver rod CB antenna with the top sections removed and a modified base loading coil - good grief.


I couldn't find any information about it , you would have thought the design would be online somewhere.

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Sun Jul 23, 2017 2:56 pm
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 4m half wave antenna on ebay 
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Post Re: 4m half wave antenna on ebay
I think the mcr666 Half wave is based on this
http://www.70mhz.org/halfwav.htm

I built it and compared it to a home-brew double Bazooka, the Bazooka blew the half wave away.


Sun Jul 23, 2017 3:15 pm
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 4m half wave antenna on ebay 
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https://m0ukd.com/2014/09/half-wave-dip ... -70mhz-4m/

or a dipol

bob.

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Sun Jul 23, 2017 3:26 pm
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 4m half wave antenna on ebay 
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Thanks for the info guys , a dipole is out of the question though as its going on top of a mast above a beam.
I would like to have seen the actual conversion from the cb antenna.

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Sun Jul 23, 2017 5:16 pm
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 4m half wave antenna on ebay 
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Post Re: 4m half wave antenna on ebay
g7pan wrote:
Thanks for the info guys , a dipole is out of the question though as its going on top of a mast above a beam.
I would like to have seen the actual conversion from the cb antenna.

End fed dipole.

Cheers

Tony

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Sun Jul 23, 2017 7:06 pm
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 4m half wave antenna on ebay 
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I have the same antenna from the same seller been up for a few years and works a treat.. :good:


Attachments:
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IMG_20170723_212039539_HDR[4].jpg [ 16.33 KiB | Viewed 2368 times ]

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Sun Jul 23, 2017 8:36 pm
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 4m half wave antenna on ebay 
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Pity you didn't have a look inside ,I have put the sirio on the mast but it is a bit heavyweight for the top.
Have you compared the antenna to anything else?

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Mon Jul 24, 2017 11:55 am
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 4m half wave antenna on ebay 
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Post Re: 4m half wave antenna on ebay
g7pan wrote:
Pity you didn't have a look inside ,I have put the sirio on the mast but it is a bit heavyweight for the top.
Have you compared the antenna to anything else?

I didn't notice a weight in the advert so how can you be sure it's lighter.
I've a Sirio and can't remember it being particularly heavy.

I'll check when I'm home.
It's not up as I don't use vertical polarisation.

Cheers

Tony

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Mon Jul 24, 2017 6:40 pm
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 4m half wave antenna on ebay 
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Its not massively heavy but i only have a light weight mast and rotator ,its the bottom matching section that adds the weight to it .
I have actually spent some time tonight making the matching section based on the half wave G6SVN pointed out on the 4m website, after a bit of messing i now have a half wave endfed.
I'll get it tarted up over the next week or so and put info on my build on here for others to follow if they want.

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Mon Jul 24, 2017 6:49 pm
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 4m half wave antenna on ebay 
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A bit late, I use that 1/2 wave vertical built from the details on the 4mtr website.
Managed most of EU and some others, surprisingly good for a vertical shoved out of the loft window.

I used the top 2 sections of my fibre glass fishing pole that supports the inverted L and a plastic enclosure
for the matching section.

Phil - G7BZD


Mon Jul 24, 2017 8:23 pm
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 4m half wave antenna on ebay 
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g7pan wrote:
I have actually spent some time tonight making the matching section based on the half wave G6SVN pointed out on the 4m website.


Well done on the antenna build, now doesn't that feel better than just going out and buying a simple antenna, you've save £45

I made the same antenna though not built for outdoor use yet as the main section is just wire, it's in my loft and works quite well.


Mon Jul 24, 2017 8:26 pm
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 4m half wave antenna on ebay 
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Strange my last post seems to have gone missing :scratch:
A photo of the matching section , i used rg316 for the capacitor ,i had to mess with the tapping point and manipulate the coil.

Image

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Tue Jul 25, 2017 5:50 am
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