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Old Oct 27, 2012, 12:07 AM
Power-line attraction pilot
United States, MA, Natick
Joined Jun 2011
517 Posts
Thanks for the info I really appreciate it. I have to ask though, what Fpv camera were you using and what was its proximity to the rx receiving antenna. Secondly, elevating the tx is not the same as elevating the rx (as in flight), correct me if I am wrong...

I have never seen anyone get even remotely close to 30 miles with any uhf using a dipole on rx and what I assume is a dipole or monopole omni on the tx when flying... Half that at most. How does this all play out in the big picture then?
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Old Oct 27, 2012, 12:27 AM
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Quote:
Originally Posted by caall99 View Post
I have never seen anyone get even remotely close to 30 miles with any uhf using a dipole on rx and what I assume is a dipole or monopole omni on the tx when flying... Half that at most. How does this all play out in the big picture then?
It possible. Stock standard DL v2 setup with dipole on plane and mono pole on tx. Vtx is a sunsky 1.2g 800mw with dipole and a biquad on vrx. Max distance out is 60km. Out run the vtx range






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Last edited by emadine; Oct 27, 2012 at 12:43 AM. Reason: Distance is in meters
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Old Oct 27, 2012, 12:48 AM
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Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
28,219 Posts
Quote:
Originally Posted by caall99 View Post
Thanks for the info I really appreciate it. I have to ask though, what Fpv camera were you using and what was its proximity to the rx receiving antenna.
RCV922 camera about 3 inches from the UHF Rx antenna. It's totally UHF noise-free camera,
which is why I use it on all my fixed wing aircraft.

Quote:
Secondly, elevating the tx is not the same as elevating the rx (as in flight), correct me if I am wrong...
There's no theoretical reason why one is inherently better than the other, beyond what I said
about external Rfi. When the Rx is near the ground, the noise floor is often lower, because
some of the external sources of Rfi are blocked by terrain. When it's high in the air, the
noise floor can be higher. On the flip side, I chose to drive right through the middle of a major
metropolitan area. (See attached)

Quote:
I have never seen anyone get even remotely close to 30 miles with any uhf using a dipole on rx and what I assume is a dipole or monopole omni on the tx when flying... Half that at most. How does this all play out in the big picture then?
How it plays out, is like every other part of FPV. "It depends."

BTW, I think Trappy did 50 miles or so with ezUHF with omnis on both ends of the link.

ian
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Old Oct 27, 2012, 01:14 AM
Power-line attraction pilot
United States, MA, Natick
Joined Jun 2011
517 Posts
Quote:
Originally Posted by Daemon View Post
RCV922 camera about 3 inches from the UHF Rx antenna. It's totally UHF noise-free camera,
which is why I use it on all my fixed wing aircraft.


There's no theoretical reason why one is inherently better than the other, beyond what I said
about external Rfi. When the Rx is near the ground, the noise floor is often lower, because
some of the external sources of Rfi are blocked by terrain. When it's high in the air, the
noise floor can be higher. On the flip side, I chose to drive right through the middle of a major
metropolitan area. (See attached)


How it plays out, is like every other part of FPV. "It depends."

BTW, I think Trappy did 50 miles or so with ezUHF with omnis on both ends of the link.

ian
Thanks!

If we are thinking about the same flight trappy made he was on a mountain flying down through a valley. Either way, your comments reassure me that the RL system will go FAR
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Old Oct 27, 2012, 02:44 AM
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North vancouver, B.C. Canada
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I am shocked both the UHF tx and rx need to be sent in to get up grade for dragon link to work well with 1.2 as example

It makes no sence as Thomas system is very similar and no need for UHF tx upgrade

But only better performance with noisy cameras with v6 rx and original UHF tx

Upgrading tx is funny upgrade and new news to me

I am shocked dragon link and others actually want people to send. In UHF tx for up grade along with UHF rx to make video tx work well

haveing to separate stuff on plane
Just sucks

New improved filters rocks

Sorry no need to send in UHF tx in Thomas case

He must be further ahead than I thought

As others need major return not,only rx but tx units for UHF

To make fpv plane work well

It must really be bad news to return stuff as some guys do

Sorry to hear that

Thomas system works best no need to return stuff


Quote:
Originally Posted by tom3holer View Post
David22,

Perhaps I read your post wrong.

"This is why the dragon UHF system gives free upgrades to the Rx for UHF

People are not sending in the UHF TX for upgrades but only the UHF rxs to get filters"

I read this to indicate you are talking about the DL UHF Tx's not being sent in for upgrade.
If I am wrong I do apologize. If however if, indeed, you were talking about the DL system then it is you that is wrong, and one wrong is sufficient. Both need to be sent in together as I indicated in my first post along with the reasons why. I have a V1 system that has been upgraded and know quite well that both have to be sent in for upgrade.

Tom
Cape Cod
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Old Oct 27, 2012, 03:04 AM
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Thomas ask me long time ago about what video tx i use specially so he can make rx for me
To make work best and put in special,filters in the rx

He is best at UHF stuff and gave away free stuff to those who performed like me
It was easy to fly away and get free rxs from him for a treat
He appreciate people testing his system and show how far away it works

Others also send me free stuff to use and test be ause I am so fun to use as tester

I have to say again I am shocked the uhf,tx needs to be returned in some cases for upgrade
That has to be crappy

Thomas is really great guy he experiment well and chose his beta testers well

I am lucky guy as one of the first to test such filters to make UHF rx resilient to 1.2 and such

I smile from long ago when people call me troll but learned they were wrong
History is important

I test many things especially UHF rx and noisy things as first to do that
Homer is my mentor he helped,me big time, he is serious ham and got me into fpv in big w at
Testing on ground homer explained is utmost important

Also test newest rxs that seem to be best so UHF rx and 1.2 rx can be close

Nise to have UHF rx closer than others also to noisy cameras as Thomas design new rx to allow that

I speak Chinese and other stuff so easier to write simple

But me only one to fly long range with no rssi or OSd

Thomas ask me many times to use rssi to see what I do
But I refuse or see no need to use OSd

I fly long and short range with no rssi
As ground tests are good enough for me

People email me wondering how I do the things I do

I try to explain as best I can in English

But my best explanation is buy proper set up first time
No need for return of system to make it work

I will,answer questions if needed

I am here to help others

As others help me

It's fun to explain to others how fpv is best set up
Others even guys like Thomas who makes uhf systems is funtomshowmhim what I do
He do not like my experiments with 1/4 length UHF antenna as he'likes 100 percent UHF reception

I experiment with degraded UHF rc reception as example

Something not many people do
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Old Oct 27, 2012, 03:26 AM
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North vancouver, B.C. Canada
Joined Apr 2008
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No need to drive away to do tests like that

It's way easier to do that close to,home.
With dumbly load tx antenna
I explain to you long ago not to do this test as you do

To test,for noise free stuff just do,it with out major hustle

You are right the 777 camera is very noisy but can be made useable with faraday cage just as with pixum cameras

I test this to work now

My experiments show everything can be put in close to each other

Best thing about experiments is to show others


I will show noisiest camera and how to make it work close to UHF rx



Daemon you keep on

And learnpopcorn:



Quote:
Originally Posted by Daemon View Post
RCV922 camera about 3 inches from the UHF Rx antenna. It's totally UHF noise-free camera,
which is why I use it on all my fixed wing aircraft.


There's no theoretical reason why one is inherently better than the other, beyond what I said
about external Rfi. When the Rx is near the ground, the noise floor is often lower, because
some of the external sources of Rfi are blocked by terrain. When it's high in the air, the
noise floor can be higher. On the flip side, I chose to drive right through the middle of a major
metropolitan area. (See attached)


How it plays out, is like every other part of FPV. "It depends."

BTW, I think Trappy did 50 miles or so with ezUHF with omnis on both ends of the link.

ian
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Old Oct 27, 2012, 08:56 PM
Power-line attraction pilot
United States, MA, Natick
Joined Jun 2011
517 Posts
Quote:
Originally Posted by David22 View Post
No need to drive away to do tests like that

It's way easier to do that close to,home.
With dumbly load tx antenna
I explain to you long ago not to do this test as you do

To test,for noise free stuff just do,it with out major hustle

You are right the 777 camera is very noisy but can be made useable with faraday cage just as with pixum cameras

I test this to work now

My experiments show everything can be put in close to each other

Best thing about experiments is to show others


I will show noisiest camera and how to make it work close to UHF rx



Daemon you keep on

And learnpopcorn:
When are you going to show us this??
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Old Oct 27, 2012, 09:11 PM
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USA, NY, New York
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David's secret is masking tape
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Last edited by tushev; Oct 27, 2012 at 11:27 PM.
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Old Oct 27, 2012, 10:37 PM
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North vancouver, B.C. Canada
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Quote:
Originally Posted by caall99 View Post
When are you going to show us this??
A combo of faraday cage with grounding
More than one layer of copper mesh, actually three
One does nothing, grounding cage is important

This is 1.2 video thread

So more important is to be able to put also camera and video tx close to UHF rx

Whole idea is to put stuff nice and close and still pass ground tests 100 percent or close to it if possible

I do not invent or make UHF rx filters as Thomas does but his new rxs have new improved filters that allow for high wat 1.2 video tx to be an inch away from UHF rx and get no loss in range

Also his new filter alows for noisy cameras to be closer to UHF rx
With cage faraday, and proper grounding noisy camera can be within 1/2 or even closer than before

Thomas is genius with new improved filters

1.2 video tx does not effect Thomas UHF rx
Noisy cameras can be way closer even with no additional david22 faraday cage
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Old Oct 28, 2012, 10:11 AM
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Joined Jan 2012
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I just have pluged in never used Fox800 VTX and have an issue with it It always starts with CH4. My old one remembers the last CH used, but this one not.

Any remedy for this? It makes it complicated to use that VTX and been forced to change CH every time you start it...
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Old Oct 28, 2012, 10:27 AM
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USA, NY, New York
Joined Nov 2008
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Humm, that's odd.
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Old Oct 28, 2012, 10:30 AM
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That I know
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Old Nov 01, 2012, 11:02 AM
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Joined Oct 2012
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So i will start using a UHF system and therefore bought a lawmate RX to change out my "digital" RX. I was using SPW on both sides but now i read some saying that the lawmate does not like those kind of antennas adn others it will work fine. What could happen if i try, will i fry somthing ??
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Old Nov 01, 2012, 12:14 PM
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France, Limousin, Limoges
Joined Jul 2009
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Quote:
Originally Posted by Summitdude View Post
I was using SPW on both sides but now i read some saying that the lawmate does not like those kind of antennas adn others it will work fine. What could happen if i try, will i fry somthing ??
I'm using SPW on my lawmate VRx and it's good.

You can only fry a VTx... but not with a SPW.
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