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Old Apr 11, 2009, 06:27 PM
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North vancouver, B.C. Canada
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I have had my eyes on this one for my booster.

http://www.centerfireantenna.com/uhf14.html
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Old Apr 11, 2009, 07:50 PM
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Carlyle Harper's Avatar
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Quote:
Originally Posted by David22
I have had my eyes on this one for my booster.

http://www.centerfireantenna.com/uhf14.html
It looks like Sputnik ready for launch.

That one is going to require tuning once you put it together. Have you got an antenna analyzer or swr meter to do this?

This antenna has a so-239 connector. If the connector is pointed down you could just use an adapter to directly connect the booster to it. Otherwise make a jumper with a male bnc on one end and a pl-259 on the other end.

But, like other verticals it is designed for ground propagation, so better not fly too high above it. Great for long distance low atlitude flying. But I doubt you will see any great improvement in range.

Thomas has been saying all along that the whip he provides will get you out pretty far though.
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Old Apr 12, 2009, 02:19 AM
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North vancouver, B.C. Canada
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someone else posted that antenna a while back, it is just on my mind.

I still need to go get some of that booster cable and set up.

Some really smart guy helped me out and soldered on piano wire on a few antennas for me. This is makeing my install easier for me. I wonder how many mph they are rated for?
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Old Apr 12, 2009, 01:49 PM
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Danmark, Hovedstaden, Ballerup
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well the antenna david22 refers too is not at all a dumb idea !
it is a quarterwave just like the supplied whip is,
but it have ground plane radials in right length and right angle !
this improves swr alot, also its external mounting makes it super easy
for a user to mount it high and free on a long stick,
this will improve the range a lot, such antennas have like all verticals
a dark hole in the end of the stick, so do not use such antennas to make
extreame height record attempts. but as carlyle say they are best at about 45 deg up and out, look at radiation paterns af quarterwave groundplanes and you see what I mean.
use thick coax like RG213 or RG214 is prefered and do not use any longer coax
than nesessary.
if you combine this with the booster, just put the booster near the antenna, and then a long cable to the tx box that comply to the max loss mentioned on the booster page.

if it is possible try to ask for a BNC style conector on this antenna,
so all your RF cables used for this system can have BNC, makes it all more
flexible to use for you. also ask for ready made BNC cables saves you time and trouble, some find it hard to mount RF connectors to coax cables correctly. I prefer to pay a bit extra and let others hassle with this :-)

------------
The yagi antenna Carlyle mention might be a huge hit !!
maybe even a too big hit, if too many customers see this post
I might not sell any more boosters :-)
someone needs to purchase one, sweep it, and range compare it,
and repport to us the results.
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Old Apr 12, 2009, 05:42 PM
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Danmark, Hovedstaden, Ballerup
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go here :
http://www.f9ft.com/indexe.html

look in the 430 to 440 menu
I have the 20909 and likes it alot, cheap and good quality and great performance
and was easy to assemble, I also have a 25 elements for 2300 20745
I use that one for my 51km range test :-)
http://www.rcgroups.com/forums/showt...ighlight=video

you can also find an 8dBi patch, I think that is what many are looking for.
I would personally go for the 20909 and see, if you point it to your
plane together with your video rx antenna,
then I could really dream of your results :-)
remember to mount the video and rc uplink antennas a good distance
from each other
so you are sure your ground station is performing uptimal, to break
records and fly safe,
you might need two helpers handeling the two directional antennas.
and also rssi readout on the OSD so each helper have data to uptimize
antenna positions after.
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Old Apr 12, 2009, 06:01 PM
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jalves's Avatar
Portugal
Joined Mar 2004
2,637 Posts
I Like the aperture angle of the patch I'll email them.
Thanks!
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Old Apr 13, 2009, 11:07 AM
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WTurbiasz's Avatar
Albany NY
Joined Feb 2005
476 Posts
Thomas I didnt see this mentioned anywhere in the documentation so sorry if I missed it but what is the max amp draw that the receiver can handle ?

Tek
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Old Apr 13, 2009, 12:19 PM
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Tek, look here under HARDWARE RX UNIT:
http://www.webx.dk/rc/uhf-link3/manu-hw300.htm

and under RX SERVO Supply current too,
you have see the pictures of the extra thick supply wires and deans connectors ?
bottom of this page:
http://www.webx.dk/rc/uhf-link3/pics-vids.htm
if you use 8 really big and strong servoes drawing 2A each,
I would maybe be a bit affraight of the copper tracks of the rx
and add a wire on the centre pads on the back side, you also need to make the
extra supply wire trick anyway, due to the limits of normal servo plugs :-)
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Old Apr 13, 2009, 12:40 PM
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Lewis Center, OH
Joined Jun 2006
2,275 Posts
Thomas,
For the RX you mention voltage should be 4-6V. Is it safe for folks using 2S A123 packs as receiver packs with your system? They charge to 7.4V, but quickly settle in at around 6.4V. I've been using them on my Telemaster with great success.

I may be ordering MORE than one system from you soon depending on the decisions of one of my customers.
Tim
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Old Apr 14, 2009, 09:42 AM
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I am not super familiar with A123 cells and their max and min and discharge curve,
the RX have a kill voltage of 9V but all prarameters are uptimized for 5.0V
I think you will degrade it a bit when voltage is out of the 4-6V range.
one trick when using A123 might be braking the connection to the RX's supply
from the servos's supply and add en external 5V LDO, or maybe just a diode drop
will do it, depending on A123's discharge diode or LDO.

Tim please email me your ideas for more systems, I have stock right now,
but have a secret price for returning customers and upgrading customers that want more and more from me,
the reason is returning customers only need support time once, this means I can sell you much cheaper stuff when you dont need support.
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Old Apr 14, 2009, 06:08 PM
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...
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Old Apr 14, 2009, 06:41 PM
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saabguyspg's Avatar
Calgary Canada
Joined Jun 2006
5,028 Posts
Hi Thomas, I have been lurking here for a while now and have a qestion. Can your receiver supply a ppm stream output for use by a Mikrokopter board? Would it be possible to order a recevier that can give ppm stream out on one connection but still have standard servo outputs as well?

Thanks

Steve
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Old Apr 14, 2009, 07:53 PM
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Muskoka, Ontario, Canada
Joined Mar 2008
931 Posts
A new happy customer!

Right out of the box we went 0.8km on the ground. Setup was a breeze. I have some video and many pics to follow tomorrow.

We turned around at 0.8km because the video was getting bad. Control was rock solid.

Pics of setup, some video and a better description tomorrow.

I have nothing but good things to say but I will say it better tomorrow. (we have had a few celebrating)

Cheers,
Spud.
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Old Apr 14, 2009, 08:39 PM
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Joined Aug 2005
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saabguyspg,

The 307 and above code will do that but you may have to do some soldering. Basically, the highest channel (channel 12) will default to PPM stream output if you have less than 12 channels in use. So, say your radio only uses 8-channels, then channel 12 will have PPM output. You will have to solder a wire to the MCU to get this signal though.

Daniel
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Old Apr 14, 2009, 08:42 PM
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Albany NY
Joined Feb 2005
476 Posts
This is nothing amazing and certainly no range records were set here today but its a nice example of how this systems integrates well into not only aircraft. We use it in a RC FPV Truck. Click on the link just above the video for the HD version.

Tek

http://www.vimeo.com/4157881
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