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Old Aug 01, 2010, 10:38 PM
First to go over 106K feet
Crist Rigotti's Avatar
United States, TX, Waxahachie
Joined Mar 2008
2,485 Posts
Tonight I went out a whopping 30,350 feet. 5.78 miles or 9.31 km. Video was very good and I started to get failsafes so I turned back home. Maybe I'll try a patch antenna on the DX7 to see if I can get further out.
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Old Aug 01, 2010, 10:41 PM
I AP'd myself again......
aviatordave's Avatar
Yawn....Iowa
Joined Mar 2005
2,500 Posts
Amazing Crist. Give me a yell next time you do that! I'll come down.

Ha, it says we are 176 miles apart...more like 17.6 miles
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Old Aug 01, 2010, 10:58 PM
First to go over 106K feet
Crist Rigotti's Avatar
United States, TX, Waxahachie
Joined Mar 2008
2,485 Posts
Quote:
Originally Posted by aviatordave View Post
Amazing Crist. Give me a yell next time you do that! I'll come down.

Ha, it says we are 176 miles apart...more like 17.6 miles
Thanks Dave will do. Might even go out tomorrow evening.
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Old Aug 01, 2010, 11:35 PM
The Fixer
Canada, ON, Mississauga
Joined Jan 2009
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A patch will do wounders. That distance so far is outstanding.
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Old Aug 02, 2010, 02:55 AM
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Old Blighty
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I use a 1W booster with 18dB patch antenna. Works faultlessly.
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Old Aug 02, 2010, 03:17 AM
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Brasil, PR, Curitiba
Joined Apr 2010
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Cris, what downlink frequence are you using with? And its power output?

Thanks!

Quote:
Originally Posted by Crist Rigotti View Post
Tonight I went out a whopping 30,350 feet. 5.78 miles or 9.31 km. Video was very good and I started to get failsafes so I turned back home. Maybe I'll try a patch antenna on the DX7 to see if I can get further out.
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Last edited by guipedroso; Aug 02, 2010 at 03:23 AM.
Old Aug 02, 2010, 04:30 AM
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Old Blighty
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Quote:
Originally Posted by Crist Rigotti View Post
Tonight I went out a whopping 30,350 feet. 5.78 miles or 9.31 km. Video was very good and I started to get failsafes so I turned back home. Maybe I'll try a patch antenna on the DX7 to see if I can get further out.
When you were 5.78 miles out, at what altitude were you flying at ?
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Old Aug 02, 2010, 07:47 AM
First to go over 106K feet
Crist Rigotti's Avatar
United States, TX, Waxahachie
Joined Mar 2008
2,485 Posts
Quote:
Originally Posted by guipedroso View Post
Cris, what downlink frequence are you using with? And its power output?

Thanks!
See post #1 for details except I'm going with the 1W booster now.
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Old Aug 02, 2010, 07:48 AM
First to go over 106K feet
Crist Rigotti's Avatar
United States, TX, Waxahachie
Joined Mar 2008
2,485 Posts
Quote:
Originally Posted by iandavidson99 View Post
When you were 5.78 miles out, at what altitude were you flying at ?
5K feet. Next time I'm out that far I'll try it at the 10:1 ratio.
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Old Aug 02, 2010, 08:27 AM
FPV Desert Beta Test Center
Mesa, Arizona
Joined Nov 2006
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Obviously you didn't know that 5.78 miles is impossible with 2.4. It's not even worth trying. Not even worth discussing.
Keep up the interesting work!
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Old Aug 02, 2010, 10:11 AM
First to go over 106K feet
Crist Rigotti's Avatar
United States, TX, Waxahachie
Joined Mar 2008
2,485 Posts
Quote:
Originally Posted by Gary Evans View Post
Obviously you didn't know that 5.78 miles is impossible with 2.4. It's not even worth trying. Not even worth discussing.
Keep up the interesting work!
Thanks Gary. I will.
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Old Aug 02, 2010, 12:10 PM
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Melbourne, Australia
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Hi Christ, I've read that your going to (maybe have already) put a 6db attenuator in place of the current 4db. That would lead to a reduction in output power, May I ask why you are doing this and what is the thinking behind it?

Thanks Geoff
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Old Aug 02, 2010, 12:23 PM
The Fixer
Canada, ON, Mississauga
Joined Jan 2009
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Geoff
The Attenuator go's between the radio and booster. It's used so it doesn't damage the output of the radio which puts out more power than the input to the booster needs to operate. The dx7's output power cant be reduced as in the dx6i which can be turned down.
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Old Aug 02, 2010, 12:24 PM
First to go over 106K feet
Crist Rigotti's Avatar
United States, TX, Waxahachie
Joined Mar 2008
2,485 Posts
Quote:
Originally Posted by garris2 View Post
Hi Christ, I've read that your going to (maybe have already) put a 6db attenuator in place of the current 4db. That would lead to a reduction in output power, May I ask why you are doing this and what is the thinking behind it?

Thanks Geoff
Neither attenuator reduces the output power of the booster. They only reduce the input power. Input power is not direct relation to output power. BTW, I started with a 6db attenuator then switched to a 4db attenuator because my brother was using one and I wanted to "proof" it for him. I never bothered to change back to the 6db attenuator.
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Old Aug 02, 2010, 01:32 PM
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Melbourne, Australia
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Quote:
Originally Posted by Martin Y View Post
Geoff
The Attenuator go's between the radio and booster. It's used so it doesn't damage the output of the radio which puts out more power than the input to the booster needs to operate. The dx7's output power cant be reduced as in the dx6i which can be turned down.
Yes I understand that. My understanding is also that the RF amp does not put out a fixed 1W of power. It has a gain of around 15dB, so a reduction of input power (because of the greater attenuation of 6 of 4dB) would lead to an overall reduction of output power.
So I was curious to know why Christ might want a reduction in output power (of the amp). Because the output power of the RC Tx can't be changed.
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