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Re: Avanti AV101 Astroplane / New Sirio Top One


Hi rich, thanks for the info, the more I look at the Sirio version the more it looks like a new design not a bit like the original avanti one, it's also described as a 1/4 wave were the original as far as I know was a 5/8 wave antenna, and the sirio at £99!, I dont know, maybe as you suggest the KP-O one would be fine, I have emailed for some details regarding the KP-O one and will put a post up when I get them.

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Patrick
19/Sep/2009, 7:45 pm Link to this post Send Email to mikefox whiskey   Send PM to mikefox whiskey
 
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Re: Avanti AV101 Astroplane / New Sirio Top One


i have a PDF file with some info about the astroplane also the sigma IV and moonraker 4&6
i had an astroplane in the early 80's after my sigma IV was stolen from my garden (yes i said stolen!!) it was the first brand new antenna i ever bought, it worked very well for local and DX and i only had it up about 20ft as i was living at home with my mum !! i paid £38 for it think the sigma IV was about £79 at the time. if anyone wants the info drop me your email ad. and i will forward the info

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John 26FB310
"I'am a man of very few words"

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Re: Avanti AV101 Astroplane / New Sirio Top One


hi patrick! i think the kpo will be just fine! much better price as well! also i think the kpo will be based on the original so no gamma match!!! you can run lots of power up these as well because you have nothing to burn out!! the originals were claimed as 5/8 wave performance!!not sure how true that was! because its only about 12 foot high! the top radials are for the loading!! all i can say is the one i had worked fantastic! and when i swaped it and changed to a 5/8 silver rod i couldnt tell much difference in dx or local!! so maybe it was 5/8 performance??? 73s rich.
20/Sep/2009, 10:27 am Link to this post Send Email to rich 26fb456   Send PM to rich 26fb456
 
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Re: Avanti AV101 Astroplane / New Sirio Top One


Hi rich, interesting stuff, I went on a few forums and the debate over the astroplane being a 5/8, 1/2 or 1/4 wave or neither is like opening a can of worms! the way I see it in my limited knowledge so far is if you count the 2ft horizontal top loading element, the 4ft vertical top whip piece then the 8ft section which goes down to the ring at the bottom, and another 8ft section that folds back up to the feedpoint the total is 22ft (5/8 length on 11m) anyway there seems to be more good reports than bad ones, the bad ones being mechanically weak in the building methods or the newer 'clones'. I guess the Sirio version will be tested soon after it arrives at the UK distributers next month.

I found the patent for the original astroplane and it states that the capacitance hat at the top can be very effectively replaced with enough whip to make the top vertical peice a full 1/4 length, this apparently wideband's the antenna.

The research goes on!! emoticon

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Patrick
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Re: Avanti AV101 Astroplane / New Sirio Top One


hi patrick. yes there a curious antenna for sure! that debate over what it is in wave lenght has gone on for years it was about when i had one!!! the same goes for the starduster m-400 is it a 1/4 or 1/2 wave?? anyway! i always found the astroplane to be quite broadbanded! never needed to play with it at all! i do know that the sirio astroplane (the new one) has longer down radials not sure why! may be to compliment the gamma match or some thing? 73s rich.
20/Sep/2009, 1:32 pm Link to this post Send Email to rich 26fb456   Send PM to rich 26fb456
 
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Re: Avanti AV101 Astroplane / New Sirio Top One


I was not aware that the new Sirio Top-One had longer down radials, I assumed they were 8ft, I know there is 4 of them though and the original had 2 (one down to the ring and one back up).

I remember having a starduster type antenna too, it was an AS Javelin Hy gain, it worked very well I must say on the gable of my mums house when I lived there, we were about 1000ft above sea level and it was a town by the sea, I don't remember what length it was but there was loading coils on all the elements, for extra support on the legs at the bottom the guy that put it up used 3 bamboo canes, it remained up there for about 5 years before a leg broke followed buy another which my mum used to prop plants in the garden up! like yourself rich I moved to a 5/8 wave vertical Silver Rod with the little curved ground planes on the bottom. I remember putting that up with out even SWRing it and found that it was already 1:3 or something, must of been beginners luck!

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Re: Avanti AV101 Astroplane / New Sirio Top One


hi patrick. i still think you have to go some you know to beat a 5/8 wave silver rod! i have one with the 3 bent ground planes and ive talked everywhere on it!!its called a vennom? it was as cheap as chips at £20!!! didnt think it would last long!! i was in desperate need of an antenna so got the 5/8 wave! so far its survived 3 winters ok not a problem! very high winds/good swr/good band with! just a question! do you need a smallish antenna like the astroplane?? or where you just curious?? the reason i ask is if space is not a problem! you could have 3 of those 5/8s for the price of that astroplane!!!!! just a thourght! 73s rich.
20/Sep/2009, 9:15 pm Link to this post Send Email to rich 26fb456   Send PM to rich 26fb456
 
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Re: Avanti AV101 Astroplane / New Sirio Top One


Hi Pat, I just have to put my view accross, which is that the astro plane seems to me to have been some what of a gimmick antenna.

By this I mean most radio operaters free banders and hams would probably agree that an antenna that is straight or in a V and at its correct physical wavelength by this I mean not folded, coil loaded etc will perform better than something that is.

Ie you can load a silver rod so that its only say 11 ft long, but why would you.?

You load a mobile whip, but a full size quarter wave is better but not practical.

A full size beam works better than one with loading coils.

The list goes on so why would you want to bother with the astro plane?????

Is it just the fact that it looks different????

Food for thought Pat

Regads

VC7 Jon
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Re: Avanti AV101 Astroplane / New Sirio Top One


Hi all, interesting stuff there and understood about your opinion there Jon, the astroplane was a invention of 1960s USA and was built in such a manner as to get over the height restriction the FCC had imposed, (no higher than 20ft above the building) as far as I have read the mast below the antenna acts as part of the radiator too. The design was to allow the operator to put the antenna a little bit higher without braking the law in them days.

Whither or not the antenna is a gimmick remains to be seen, and I may find out the hard way!

I am quite curious about the antenna, the forums in the states have quite a high opinion of the astroplane type antenna, the benefits as far as I have read are that the antenna itself has no traps, loading coils or matching device so a lot of power can be put through it without anything getting cooked!, it radiates from the top (unlike a vertical that radiates from the lossy bottom matching coil) and that it has an effective way of working at low heights and specifically for QTHs that are in a basin or valley and surrounded by higher hills like I am.

Anyway the research goes on before I pay out! I apperciate all the comments and will keep posted.

73s

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Re: Avanti AV101 Astroplane / New Sirio Top One


Dont do it Pat.....You know you will end up buying one...lol
How are you going to feel if you pay all that money and find out its rubbish or at least worse than a silver rod type antenna.

best regards
VC7 Jon
21/Sep/2009, 2:45 pm Link to this post Send Email to VC7   Send PM to VC7
 


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