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Old Feb 04, 2013, 09:06 AM
Engineer for Christ
IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
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Quote:
Originally Posted by Kahnx View Post
I have a couple of SPW (3-blade cloverleaf) antennas that were mistakenly built for 1080Mhz.

I would like to run them on 1040MHz (Channel 4 on non-US 901MHz VTXs).

What is the bandwidth of the antennas like at these lower frequencies?
Is it worth the effort to build new antennas at 1040MHz in terms of range/signal-quality/less-heat? How much better would properly tuned antennas be?

Thanks in advance for the advice.

Roger
You are going to suffer a loss of ~2db or so. If you need absolute range, then this is no optimal. However, chances are you aren't going to get anywhere near you max range due to other factors and this is probably ok.

-Alex
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Old Feb 04, 2013, 01:27 PM
Registered User
United States, Mt, Great Falls
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343 Posts
here it is

Thanx for the how to!
oh yeah is for 1280
going on my penguin with ibcrazy 3 turn helical
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Last edited by jminardi; Feb 04, 2013 at 01:30 PM. Reason: more info
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Old Feb 06, 2013, 04:09 AM
I Like Clouds Made Of Limes?
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United Kingdom
Joined Jun 2012
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How are mine looking?

This is as neat as i can get them! Should be good to 1Km 200mw 5.8GHz right?
Hope they work ok!
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Old Feb 06, 2013, 04:09 AM
I Like Clouds Made Of Limes?
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Top side!
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Old Feb 06, 2013, 05:46 AM
Registered FPVer :)
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Switzerland, LU, Buchrain
Joined Aug 2006
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Quote:
Originally Posted by BenLimeClouds View Post
How are mine looking?

This is as neat as i can get them! Should be good to 1Km 200mw 5.8GHz right?
Hope they work ok!
To give range estimations is always difficult as in theory you could have made some fatal mistake somewhere, but asuming you did not, the 1km figure seems plausible.

Markus
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Old Feb 06, 2013, 09:13 AM
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Switzerland
Joined Sep 2008
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I saw people using skew planar wheel on RX and TX. Is it a big issue?
I have few of them in stock and I want to try....I do not want to reach 1km it is for internal fpv (with walls)
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Old Feb 06, 2013, 09:15 AM
Mobius Cables... I got em'
chanyote66's Avatar
United States, TN, Oak Ridge
Joined Dec 2011
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Quote:
Originally Posted by Cid156 View Post
I saw people using skew planar wheel on RX and TX. Is it a big issue?
I have few of them in stock and I want to try....I do not want to reach 1km it is for internal fpv (with walls)
it will work fine... I flew with the SPW on the plane and a CL on the ground station until i realized that was backwards

Chris
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Old Feb 06, 2013, 09:30 AM
Engineer for Christ
IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
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Quote:
Originally Posted by Cid156 View Post
I saw people using skew planar wheel on RX and TX. Is it a big issue?
I have few of them in stock and I want to try....I do not want to reach 1km it is for internal fpv (with walls)
You can mix them any way you want. I personally use two cloverleafs. Some prefer two skew wheels. Most use one of each. I found that two skew wheels did not do nearly as well as two cloverleafs. in fact, the whole reason I came up with the cloverleaf was because I flew with two skew wheels and was really disappointed.

-Alex
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Old Feb 06, 2013, 09:38 AM
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Thank for your replies, I appreciate
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Old Feb 06, 2013, 11:29 PM
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I have a question. Does it matter it the transmitter antenna is mounted up, down or sideways? I want to mount one on my Quad. Thanks for any help.
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Old Feb 07, 2013, 12:17 AM
Engineer for Christ
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Amherst, VA
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Upright or upside down doesn't matter. Just do not lay it on its side.

-Alex
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Old Feb 07, 2013, 09:37 AM
Mobius Cables... I got em'
chanyote66's Avatar
United States, TN, Oak Ridge
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Quote:
Originally Posted by IBCrazy View Post
Just do not lay it on its side.

-Alex
It lets the RF fluid pour out
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Old Feb 07, 2013, 09:39 AM
Mobius Cables... I got em'
chanyote66's Avatar
United States, TN, Oak Ridge
Joined Dec 2011
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Hey IB,

I have been testing my antennas and found that I have more interference on one side of the antenna than the other with my MM.

I checked all connections and it is good. Could this be that a wire is short, or wrong angle? any way to identify which lobe?

Chris
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Old Feb 07, 2013, 10:20 AM
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Switzerland, LU, Buchrain
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Quote:
Originally Posted by chanyote66 View Post
Hey IB,

I have been testing my antennas and found that I have more interference on one side of the antenna than the other with my MM.

I checked all connections and it is good. Could this be that a wire is short, or wrong angle? any way to identify which lobe?

Chris
Whats an "MM", and was this in open space? If so, most likely the lobe closer to that side where you get more interferance would be the "bad" one.

If this was not open space, then the fact that you get more inerferance on one side would most likely tell that on the side with more interferance there are more signal reflecting obstacles.

HTH

Markus
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Old Feb 07, 2013, 10:26 AM
Mobius Cables... I got em'
chanyote66's Avatar
United States, TN, Oak Ridge
Joined Dec 2011
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Quote:
Originally Posted by markus123456 View Post
Whats an "MM", and was this in open space? If so, most likely the lobe closer to that side where you get more interferance would be the "bad" one.

If this was not open space, then the fact that you get more inerferance on one side would most likely tell that on the side with more interferance there are more signal reflecting obstacles.

HTH

Markus

MM = Mad Mushroom

yes its open space... mounted 8" above the RX... and i rotated the antenna to eliminate localized interference. when i rotated the antenna 90 degrees, so did my poor reception area...

I tore the whole thing apart and started to measure the lobes. I used a jig to build the lobes so they are all +/- .25mm so I think its in the angle or something... Still building a jig for mounting lobes.

I use a magnetic jig for my CL/SPW builds...

Chris
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