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Old Jan 03, 2012, 04:52 PM
Gig 'Em!
TexasAggie's Avatar
United States, TX, College Station
Joined Nov 2010
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Well, here's #2 for 1280 MHz. How's it look? I ended up getting the lobes to be positioned such that I didn't need the hooks to solder the middle.
Edit: I used 107 degrees for the lobe angle. The overall length of each lobe was 245mm and I bent at 60mm from each end.
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Last edited by TexasAggie; Jan 03, 2012 at 05:20 PM.
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Old Jan 03, 2012, 05:10 PM
Registered FPVer :)
markus123456's Avatar
Switzerland, LU, Buchrain
Joined Aug 2006
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Quote:
Originally Posted by TexasAggie View Post
Well, here's #2 for 1280 MHz. How's it look? I ended up getting the lobes to be positioned such that I didn't need the hooks to solder the middle.
Looks great. If you were precise with the measures, I'm sure it will perform nicely.

Markus
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Old Jan 03, 2012, 05:17 PM
14s 180mah should be enough...
IFLYOS's Avatar
United States, NC, Pfafftown
Joined Feb 2001
3,671 Posts
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Originally Posted by Nobert View Post
TA

Here in Tucson the public services all use the 1280 band. They have a lot more power and can interfere with FPV setups.
Hope this helps.

Neal
Neal, I am sorry, but this isn't possible. In the US, Amateur radio operators have exclusive use of 1240 Mhz to 1300 Mhz.

Now, it is possible there is a repeater in the 1.2Ghz band for Amateur use*, and that is causing the interference you refer to, but again, 1240-1300Mhz is allocated by the FCC for exclusive Amateur use. We do share some of our allocations with other groups, but not this one.

see http://www.ntia.doc.gov/files/ntia/p...3-allochrt.pdf for the breakdown of allocations in the US

Tim
AG4RZ

I just looked, and there is an Amateur repeater located at 9200 ft atop Mt Lemmon neat Tucson, Arizona - This is a D-Star machine. It is on 1298.25...
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Last edited by IFLYOS; Jan 03, 2012 at 05:20 PM. Reason: Added info
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Old Jan 04, 2012, 08:09 AM
Engineer for Christ
IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
10,403 Posts
Quote:
Originally Posted by TexasAggie View Post
Well, here's #2 for 1280 MHz. How's it look? I ended up getting the lobes to be positioned such that I didn't need the hooks to solder the middle.
Edit: I used 107 degrees for the lobe angle. The overall length of each lobe was 245mm and I bent at 60mm from each end.
Darn good if you ask me. Now fly it

-Alex
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Old Jan 04, 2012, 09:04 AM
Gig 'Em!
TexasAggie's Avatar
United States, TX, College Station
Joined Nov 2010
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Originally Posted by IBCrazy View Post
Darn good if you ask me. Now fly it

-Alex
Thanks. First I have to hot glue it a bit and then make another cloverleaf since I stepped on my best one yesterday.
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Old Jan 09, 2012, 07:37 AM
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United States, MD, North East
Joined Apr 2011
280 Posts
Ok so I built the SPW for the first time and it looks alright but performs awful. I recorded a LOS flight and upon reviewing the vid, there is no way anybody could fly fpv with this.

There are slight problems with my antenna. After reading I think the problem is my feed gap. I measured mine to be 9.5mm and I did not incorporate any hooks into the center joint.

Both Tx and Rx antennas are RHCP (RHCP = tractor prop, LHCP = pusher prop?) and the Tx antenna is a CL. I am on 1280 MHz.

should I bend hooks to be ~10mm or should I just shorten the feed gap or both?

I have a 5-turn helical that I just set flat on the ground and that works fine for flying around LOS or ~ 300-700 feet without pointing it - I have not flown far yet but at least I know my other components are working.
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Old Jan 09, 2012, 10:19 AM
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asaloca's Avatar
Delray Beach
Joined Aug 2004
176 Posts
Hi.
Congrats for IbCrazy ant his valious contribuiton here and for the amazing jeweller work some of you are sowing here for us !!

Can somebody tell me a supplier ...Home Depot or were you guys in states are buying the " Copper coated steel wire " ....serched the net and noyhing ..

Tks
FRED
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Old Jan 09, 2012, 10:31 AM
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SW England
Joined Aug 2009
799 Posts
2 kinds of plated wire:

Gold plated 'memory wire' - found in ladies DIY jewelery stores.

Copper plated 'MIG welding wire' - found in lots of places that sell welding equipment.

HTH

Nigel.
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Old Jan 09, 2012, 10:31 AM
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TexasAggie's Avatar
United States, TX, College Station
Joined Nov 2010
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I got a 2lb spool of welding wire at Ace. They also had it at Lowe's.
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Old Jan 09, 2012, 10:51 AM
I think it'll work this time!!
Chairwolf's Avatar
399 feet above Roanoke, VA
Joined Jan 2007
3,461 Posts
Quote:
Originally Posted by asaloca View Post
Hi.
Congrats for IbCrazy ant his valious contribuiton here and for the amazing jeweller work some of you are sowing here for us !!

Can somebody tell me a supplier ...Home Depot or were you guys in states are buying the " Copper coated steel wire " ....serched the net and noyhing ..

Tks
FRED
Harbor Freight has it for cheap, too. And Home Depot.
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Old Jan 09, 2012, 12:39 PM
Registered User
United States, MD, North East
Joined Apr 2011
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I found it at radio shack marketed as antenna ground wire. It is copper clad steel wire and had a cost of about $1/foot or something like that.
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Old Jan 09, 2012, 01:36 PM
I think it'll work this time!!
Chairwolf's Avatar
399 feet above Roanoke, VA
Joined Jan 2007
3,461 Posts
$1 A FOOT??? You can get 10 miles of it for $11.47 at Home Depot, or $8.50 at Harbor Freight!
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Old Jan 10, 2012, 03:03 PM
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Zen09's Avatar
Germany, HB, Bremen
Joined Jun 2010
922 Posts
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Originally Posted by chemnut842 View Post
Ok so I built the SPW for the first time and it looks alright but performs awful. I recorded a LOS flight and upon reviewing the vid, there is no way anybody could fly fpv with this.

There are slight problems with my antenna. After reading I think the problem is my feed gap. I measured mine to be 9.5mm and I did not incorporate any hooks into the center joint.

Both Tx and Rx antennas are RHCP (RHCP = tractor prop, LHCP = pusher prop?) and the Tx antenna is a CL.
A pusher prop behaves the same as a tractor one.

RHCP is the conventional clockwise screw thread type.
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Old Jan 11, 2012, 02:53 PM
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Joined Jan 2011
175 Posts
I have 5.8 system on order and came across this:

http://www.readymaderc.com/store/ind...roducts_id=596

Do I need 2 antennas, one for Tx, one for Rx or just for Tx is fine? Thanks in advance for your help.

Quote:
Originally Posted by IBCrazy View Post
That will do 1000+ feet with ease.

-Alex
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Old Jan 11, 2012, 03:25 PM
Registered FPVer :)
markus123456's Avatar
Switzerland, LU, Buchrain
Joined Aug 2006
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Quote:
Originally Posted by k0mputer View Post
I have 5.8 system on order and came across this:

http://www.readymaderc.com/store/ind...roducts_id=596

Do I need 2 antennas, one for Tx, one for Rx or just for Tx is fine? Thanks in advance for your help.
You need a pair. A cloverleaf on the transmitter and skew planar wheel on the receiver usually works best.

Markus
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