Espritmodel.com Telemetry Radio
Reply
Thread Tools
Old Dec 03, 2011, 03:48 PM
W4UAV
Gainesville, FL
Joined Nov 2005
1,043 Posts
My new portable ground station, works good!!
RaptorAP is offline Find More Posts by RaptorAP
Reply With Quote
Sign up now
to remove ads between posts
Old Dec 03, 2011, 03:59 PM
Team White Llama!
gundamnitpete's Avatar
Joined Jan 2008
8,144 Posts
Quote:
Originally Posted by RaptorAP View Post
My new portable ground station, works good!!
that is EXACTLY what i plan to do
gundamnitpete is offline Find More Posts by gundamnitpete
Reply With Quote
Old Dec 03, 2011, 05:56 PM
Eat-Sleep-Work-Fly-Repeat
Grips's Avatar
Canada, NL, Division No. 9
Joined Mar 2011
690 Posts
I see the 910mhz circ. polarized omni set on the website. Does anyone have a pic of the 910mhz antenna at all with anything for size comparison?
Grips is offline Find More Posts by Grips
Reply With Quote
Old Dec 03, 2011, 06:12 PM
Team White Llama!
gundamnitpete's Avatar
Joined Jan 2008
8,144 Posts
I'll take one of my SPW when I get home, but it's about 6-7 inches across I'd say.
gundamnitpete is offline Find More Posts by gundamnitpete
Reply With Quote
Old Dec 03, 2011, 07:33 PM
Team White Llama!
gundamnitpete's Avatar
Joined Jan 2008
8,144 Posts
EDIT: this is a CL, but the dimensions should be similar.
gundamnitpete is offline Find More Posts by gundamnitpete
Reply With Quote
Old Dec 04, 2011, 06:46 AM
Eat-Sleep-Work-Fly-Repeat
Grips's Avatar
Canada, NL, Division No. 9
Joined Mar 2011
690 Posts
whoa.. no kidding about how the lower the mhz the larger the antenna.. Has anyone put one of these 900mhz antennas on a plane? Any issues with durability from regular flying?
Grips is offline Find More Posts by Grips
Reply With Quote
Old Dec 04, 2011, 07:10 AM
Team White Llama!
gundamnitpete's Avatar
Joined Jan 2008
8,144 Posts
Quote:
Originally Posted by Grips View Post
whoa.. no kidding about how the lower the mhz the larger the antenna.. Has anyone put one of these 900mhz antennas on a plane? Any issues with durability from regular flying?
lots of people have, great antenna.

As far as durability, most people just bend them back after a big crash. They tend to stand up well, depending on where you put them. Even a slightly out of shape CL still works great, and at 900mhz it's alot easier to "eyeball it".

That picture does make it look larger than it is The shape of the thing misleads you about it's size.
gundamnitpete is offline Find More Posts by gundamnitpete
Reply With Quote
Old Dec 04, 2011, 06:45 PM
Engineer for Christ
IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
10,301 Posts
Quote:
Originally Posted by RaptorAP View Post
My new portable ground station, works good!!
That's what I use

-Alex
IBCrazy is offline Find More Posts by IBCrazy
RCG Plus Member
Old Dec 04, 2011, 06:47 PM
Engineer for Christ
IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
10,301 Posts
Quote:
Originally Posted by Grips View Post
whoa.. no kidding about how the lower the mhz the larger the antenna.. Has anyone put one of these 900mhz antennas on a plane? Any issues with durability from regular flying?
The antenna will hold up fine if you use .035-.045" welding wire. Making it at 900 MHz is a real pain. It is not easy trying to get all the lobes to stay put. This is why I no longer make them. It's takes me entirely too long.

-Alex
IBCrazy is offline Find More Posts by IBCrazy
RCG Plus Member
Old Dec 05, 2011, 03:09 PM
Registered User
USA, NY, Yonkers
Joined Aug 2002
1,636 Posts
Quote:
Originally Posted by Grips View Post
whoa.. no kidding about how the lower the mhz the larger the antenna.. Has anyone put one of these 900mhz antennas on a plane? Any issues with durability from regular flying?
I use a 910mhz cloverleaf on the top of the stabilizer on my Skywalker and it does not affect the flight in any way.

pc_pilot
pc_pilot is offline Find More Posts by pc_pilot
Reply With Quote
Old Dec 06, 2011, 12:52 AM
Registered User
Joined Oct 2011
106 Posts
I've got a 900Mhz SPW that I'm planning on mounting on a quad. Big antenna on a small quad, big problem right?

2 questions;
A)will a gopro within 10cm affect it too much?
B) As I'm still waiting for a SMA-F adaptor, I'm keen to play around with it. I was planning on running a short distance (<300m) with CP to linear. I should expect about 3db of loss is that correct? Is there any other reason I shouldn't be doing this?

Thanks!
smarm is offline Find More Posts by smarm
Reply With Quote
Old Dec 06, 2011, 03:49 AM
Registered FPVer :)
markus123456's Avatar
Switzerland, LU, Buchrain
Joined Aug 2006
2,806 Posts
Quote:
Originally Posted by smarm View Post
I've got a 900Mhz SPW that I'm planning on mounting on a quad. Big antenna on a small quad, big problem right?

2 questions;
A)will a gopro within 10cm affect it too much?
B) As I'm still waiting for a SMA-F adaptor, I'm keen to play around with it. I was planning on running a short distance (<300m) with CP to linear. I should expect about 3db of loss is that correct? Is there any other reason I shouldn't be doing this?

Thanks!
A) -> possible. GoPros are notorioiusly know for their IME radiation. Pack it in silverfoil if needed. If I'm not mistaken, there are sides of the GoPro which are radiating heavier than others, so maybe placing it differently helps. By all means make a serious range test!

B) Nope, nothing wrong with trying. You loose the 3dB, that's it.

Markus
markus123456 is offline Find More Posts by markus123456
Reply With Quote
Old Dec 06, 2011, 04:10 AM
SILURIA / UK
Shikra's Avatar
United Kingdom
Joined Jun 2009
2,424 Posts
Alex, I read on one of the posts on Hugo's thread I think that you have to remove resistor from the airwave rx module inside the sharks for any of the Closed Loop antennas. Because of DC bias used

Is that true? Does it make much difference?

I ask, because I only tested my antennas on the sharks - and I very carefully made several including 3,4 and 8 lobe variations of SPW,Turbine and clover. Didn't really notice any improvement over omni with 2.4.


Quote:
Originally Posted by IBCrazy View Post
That's what I use

-Alex
Shikra is offline Find More Posts by Shikra
RCG Plus Member
Latest blog entry: MultiWii OSD - MWOSD NG
Reply With Quote
Old Dec 06, 2011, 05:56 AM
W4UAV
Gainesville, FL
Joined Nov 2005
1,043 Posts
Quote:
Originally Posted by Shikra View Post
Alex, I read on one of the posts on Hugo's thread I think that you have to remove resistor from the airwave rx module inside the sharks for any of the Closed Loop antennas. Because of DC bias used

Is that true? Does it make much difference?

I ask, because I only tested my antennas on the sharks - and I very carefully made several including 3,4 and 8 lobe variations of SPW,Turbine and clover. Didn't really notice any improvement over omni with 2.4.
Im using the skew on my FS Dominators and it works fine, must be the older FS models.
I noticed less dropouts/multipathing over the stock dipole omni.
RaptorAP is offline Find More Posts by RaptorAP
Reply With Quote
Old Dec 06, 2011, 11:58 AM
Engineer for Christ
IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
10,301 Posts
Quote:
Originally Posted by Shikra View Post
Alex, I read on one of the posts on Hugo's thread I think that you have to remove resistor from the airwave rx module inside the sharks for any of the Closed Loop antennas. Because of DC bias used

Is that true? Does it make much difference?

I ask, because I only tested my antennas on the sharks - and I very carefully made several including 3,4 and 8 lobe variations of SPW,Turbine and clover. Didn't really notice any improvement over omni with 2.4.
It's only an issue with the FatShark Aviators.

-Alex
IBCrazy is offline Find More Posts by IBCrazy
RCG Plus Member
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Mini-HowTo DIY Ground Plane omni directional RX antenna IBCrazy FPV Talk 60 Nov 19, 2012 06:11 AM
Discussion 900 mhz circular polarized antenna? g00bd0g FPV Talk 9 Aug 21, 2012 09:54 AM
Discussion Left/Right circular polarized antenna ? SpookiePower FPV Talk 44 Jun 04, 2011 06:41 PM
Discussion 18dbi Circular Polarized Patch ? Coyote64 FPV Talk 3 Nov 10, 2010 04:59 PM
Question Circular polarized antenna question Sov4life FPV Talk 8 Mar 05, 2010 05:00 PM