meh ..I am not that impressed. the sigma 5 was very mixedly received
For a start without **** about with traps/coils and small folded dipole configs
..you need to weigh this against stuff like the Legendary Cobwebb ...which really does Kick Ass
and is only 8 foot across, omni directional
but just like the CW ...you could built this for £30.
Even if yours IS any good ...whithin a month someone will have them on eBay for half the price.
they will buy it, dissect it, budgetise it ....and put the clones back on ebay
game over
New Compact Vertical Antenna
- Monsta
- Top Poster
- Posts: 1196
- Joined: 10 Jun 2011, 06:34
- Location: Madchester
Re: New Compact Vertical Antenna
10/11: Anytone AT-5555, President Lincoln - Astatic Audio
HF: Kenwood TS2000 ,Kenwood G707, Heil Goldline,
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- Super Member
- Posts: 448
- Joined: 11 Jan 2010, 17:12
Re: New Compact Vertical Antenna
So what you are creating is a fixed ATU with remote switching from the rig. The fixed L+C tuning sits at the antenna rather than down the co-ax at the rig end, saving you "massive losses". But if the Pro Antennas vertical needs an ATU, it would be logical to place the ATU at the antenna anyway as this is the best location for it.
I would also wonder why so many radios have internal ATU when there is such a "massive loss" in the co-ax, well some folks just wouldn't get a signal out at all. Feedline loss is something a lot of folk will just live with given the obvious convenience of co-ax.
Just to point out, I have no affiliation to you or Pro Antennas, I use a Hexbeam and sometimes a Magloop.
Antenna talk aside, if you are working as a full time farmer, have you truly considered the time+effort required to prototype/build/market such a device. You guys have a lot of working hours and your product will live or die by how much time you have to spend supporting people who some of the time don't have a clue. Trust me from personal experience, it takes time and doesn't pay the bills.
By all means fulfil your dream and bring something new to the market that has potential to beat the competition, we all like a choice/new toy. If you have things that you think are your idea too, try to protect them as much as you can and on the other side of the coin, don't rip off someone elses work.
pw
I would also wonder why so many radios have internal ATU when there is such a "massive loss" in the co-ax, well some folks just wouldn't get a signal out at all. Feedline loss is something a lot of folk will just live with given the obvious convenience of co-ax.
Just to point out, I have no affiliation to you or Pro Antennas, I use a Hexbeam and sometimes a Magloop.
Antenna talk aside, if you are working as a full time farmer, have you truly considered the time+effort required to prototype/build/market such a device. You guys have a lot of working hours and your product will live or die by how much time you have to spend supporting people who some of the time don't have a clue. Trust me from personal experience, it takes time and doesn't pay the bills.
By all means fulfil your dream and bring something new to the market that has potential to beat the competition, we all like a choice/new toy. If you have things that you think are your idea too, try to protect them as much as you can and on the other side of the coin, don't rip off someone elses work.
pw
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- Top Poster
- Posts: 1933
- Joined: 13 Mar 2013, 22:23
Re: New Compact Vertical Antenna
All the best with the antenna,and if stated some will copy what you are doing then it won't have been that bad an antenna.The hobby of radio has been enhanced many times by people who have managed to turn an idea into reality that actually work's.
Plenty are talking worldwide on 27.555 usb,
Some are too far up their own @rse to admit it,
Many happen to know otherwise dx-ing test free,
Showing a complete lack of respect for the law.
27.555 Usb
Some are too far up their own @rse to admit it,
Many happen to know otherwise dx-ing test free,
Showing a complete lack of respect for the law.
27.555 Usb
- Black_Pirate
- Top Poster
- Posts: 1204
- Joined: 07 Oct 2007, 16:05
- Call Sign: 26TM034
- Location: s.w.UK
- Contact:
Re: New Compact Vertical Antenna
produce a Skypper clone and sell a load ....as legalisation comes portables ...hilltoppers and bases will buy....
looking for propagation for 2013 and beyond... Operating close to the Edge....
of reason......and the Quantocks...
Didi modes (JS8 on 27.245 usb) txt messages via radio lol at minus- 10 to 20 db..... See FB page...
26T.M.034
GOOD LUCK IN DX
of reason......and the Quantocks...
Didi modes (JS8 on 27.245 usb) txt messages via radio lol at minus- 10 to 20 db..... See FB page...
26T.M.034
GOOD LUCK IN DX
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- Top Poster
- Posts: 1346
- Joined: 19 Feb 2008, 00:37
Re: New Compact Vertical Antenna
the coax with a tuner myth has been banded about for many years, possibly because it seems to make sense at first glance until you look into how antenna systems work,G2FHF wrote:The problem with the Pro Antennas is that the antenna is for a single frequency and you are expected to use an ATU to use on other frequencies. This causes massive losses in the coax as the coax is only low loss when it is correctly matched at each end. An ATU should never be used with a coaxial cable.
the way to get "massive loss" with coax is to use a massive length or VERY lossy coax,
with fairly short lengths of coax (typical portable setup) and a good atu at the transmitter to effect a conjugate match the loss is minimal /not detectable over the air,
walt maxwell explains the coax & atu myth in layman's terms with his "another look at reflections".
http://www.scribd.com/doc/132602040/Ano ... -W2DU-rev1
im not trying to **** on anybody's bonfire, you don't need technobull to sell a good product but it helps catch the unwary.
W8JI
"An antenna with a poor ground using few radials cannot have a support mast grounded to the radial common point (at least it shouldn't if designed properly) There is no exception to this!
"An antenna with a poor ground using few radials cannot have a support mast grounded to the radial common point (at least it shouldn't if designed properly) There is no exception to this!
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- Super Member
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- Joined: 11 Jan 2010, 17:12
Re: New Compact Vertical Antenna
Got to have a membership for scribd, here is full version. http://www.k6mhe.com/files/Reflect_rev1.pdf
pw
pw
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- Top Poster
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- Joined: 19 Feb 2008, 00:37
Re: New Compact Vertical Antenna
thanks
W8JI
"An antenna with a poor ground using few radials cannot have a support mast grounded to the radial common point (at least it shouldn't if designed properly) There is no exception to this!
"An antenna with a poor ground using few radials cannot have a support mast grounded to the radial common point (at least it shouldn't if designed properly) There is no exception to this!
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- Super Member
- Posts: 448
- Joined: 11 Jan 2010, 17:12
Re: New Compact Vertical Antenna
Its a very good read that document, it might seem a little long winded but I urge everyone to have a read of it and understand what its about, it will be worth the effort. There are some key phrases in there that made all the sense to me when I started out in radio.
pw
pw
- kr0ne
- Veteran
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- Joined: 25 Sep 2011, 18:33
Re: New Compact Vertical Antenna
His book "Reflections" is probably one of the most useful radio books that has ever been written.