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Old Jan 30, 2012, 03:17 PM
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Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
27,684 Posts
Quote:
Originally Posted by markus123456 View Post
Ian,
Did you ever range test eUHF? If so, how does it scale to RL?
I did not. It was more negatively affected by the Rf noise from the DTV tower than the others
I had at the time, so it didn't get much attention after those couple flights. Also didn't play
nice with my Hyperion digital servos, which RL (and DL) has zero issue with.

ian
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Old Jan 30, 2012, 03:21 PM
Chris R
United Kingdom
Joined Dec 2009
713 Posts
Quote:
Originally Posted by Daemon View Post
Someone else from the UK recently mentioned he had an ezUHF system set to
work at 459Mhz, which got me looking at the UK bandplan. It sure looks like
433-434Mhz band is full of other stuff. While I can't explain difference between CL
and RL, I do wonder if you're just getting completely stepped on by the
primary users of the band.

Was your CL on exactly the same plane with exactly the same components? (no new
cameras, regulators, different ways to power stuff.. etc)

ian
Exactly same stuff and area. mates ezuhf is fine! also switching to 500mw didnt improve rssi!
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Old Jan 30, 2012, 03:30 PM
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Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
27,684 Posts
How exactly is your antenna oriented on the plane? Is the ground plane bent
at an angle away from the coax feed line?

ian
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Old Jan 30, 2012, 03:48 PM
Chris R
United Kingdom
Joined Dec 2009
713 Posts
Quote:
Originally Posted by Daemon View Post
How exactly is your antenna oriented on the plane? Is the ground plane bent
at an angle away from the coax feed line?

ian
Using a sanders style uhf antenna cut to 154mm. Same antenna that did 12km@200mw with cl
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Old Jan 30, 2012, 03:49 PM
Chris R
United Kingdom
Joined Dec 2009
713 Posts
http://fpvlab.com/forums/showthread....z)UHF-antennas
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Old Jan 30, 2012, 04:09 PM
Chinglish-funny
Joined Mar 2011
784 Posts
Quote:
Originally Posted by Cir2kuk View Post
Exactly same stuff and area. mates ezuhf is fine! also switching to 500mw didnt improve rssi!
I knew you already did it up to 12KM on RL Low power mode, i think maybe the tx has an issue,just send it back to me for repair.


Sid
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Old Jan 30, 2012, 04:22 PM
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Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
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Hmm, a monopole. In my various UHF range testing, I've never found monopoles (whips),
whether they were stiff or flexible, to compare very well to dipoles or ground plane antennas.
For one thing I've found that having the counterpoise (ground plane) oriented about 45
degrees from the active element (and away from coax feed) really helps reduce the nulls
off the ends of the antenna and helps reduce the huge loss due to cross polarization.
Anyway, that aside the monopole should be fine for the range you're flying now. I'd look at
your connections, test continuity and make sure you don't have a break in the antenna.
Maybe its an impedance mismatch. I'd test with stock RL antenna.
Try putting RL in micro-power mode and check your range with your monopole
versus the stock RL antenna. Test in all orientations. How far do you
current get with Tx in micro power mode?

BTW, using stock RL Tx antenna?

ian
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Old Jan 30, 2012, 04:29 PM
Chris R
United Kingdom
Joined Dec 2009
713 Posts
Using stock rl antennas in micro mode getting 30m
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Old Jan 30, 2012, 04:35 PM
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Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
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That sounds comparable to what I'm seeing.
And what do you get using the monopole? Again, be sure to compare them in all orientations.

ian
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Old Jan 30, 2012, 04:38 PM
Chris R
United Kingdom
Joined Dec 2009
713 Posts
Might test 200mw and 500mw with rx antenna removed. check im getting 2 power setting!

Not tested monopole wil do lots of testing tomorrow.
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Old Jan 30, 2012, 04:40 PM
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Lakewood, Colorado
Joined Aug 2002
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Range can be very inconsistent with the antenna removed.
What range do you get in micro-power mode with the monopole on the Rx?

ian
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Old Jan 30, 2012, 04:42 PM
Chris R
United Kingdom
Joined Dec 2009
713 Posts
Will test tomorrow and get back to you
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Old Jan 30, 2012, 10:19 PM
BEOWULF
North vancouver, B.C. Canada
Joined Apr 2008
18,078 Posts
Ian it might be worth it to put a ferite on the uhf antenna with your serious problems from towers

It is called a ballun or ferite

it would also to see your rsults as you have most uhf systems what the power draw is from each system
as you know higher volts etc. will provide better range

there is a chance some uhf systems are under rated in power and explain range test differences
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Old Feb 01, 2012, 04:35 AM
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Teamsherman's Avatar
Australia, NSW, Picnic Point
Joined Aug 2011
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My OSD pro says i need a low impedance rx for correct RSSI display and so it doesnt interfere with my range, is the Rangelink Rx low or high impedance? And will RSSI be accurate with my OSD Pro?
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Old Feb 01, 2012, 04:44 AM
Team Flying Pirates
_ELLIOT_'s Avatar
Joined Nov 2011
193 Posts
Quote:
Originally Posted by David22 View Post
Ian it might be worth it to put a ferite on the uhf antenna with your serious problems from towers

It is called a ballun or ferite

it would also to see your rsults as you have most uhf systems what the power draw is from each system
as you know higher volts etc. will provide better range

there is a chance some uhf systems are under rated in power and explain range test differences

nice work.. can you explain better?
i know what is balun and how it works but... i don't know how to make it and if it will really increase the range.

thnx
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