HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Mar 26, 2011, 05:37 PM
Registered User
Melbourne, Australia
Joined Oct 2010
114 Posts
i had the same prob - it fixed itsself.. maybe the moving the vee at the coax connection...
El1m1nate is offline Find More Posts by El1m1nate
Reply With Quote
Sign up now
to remove ads between posts
Old Apr 02, 2011, 03:23 PM
Engineer for Christ
IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
10,534 Posts
15 channel VTX testing and Verification

Special thanks to Durtbag for loaning me his 15 channel VTx. This video displays the channels and the power output. All testing was done at 12VDC.

The bad thing about this unit is that it loses frequency lock at 8.75V

15 channel 1.2GHz VTX Testing and verification for FPV (2 min 34 sec)


-Alex
KJ4RIV
IBCrazy is offline Find More Posts by IBCrazy
Reply With Quote
Old Apr 02, 2011, 04:20 PM
Registered User
Luxembourg
Joined May 2009
806 Posts
1 question: does it loose power during voltage decrease?

Link to the Vtx?
iacei is offline Find More Posts by iacei
Reply With Quote
Old Apr 02, 2011, 04:52 PM
Registered User
Joined Sep 2010
2,419 Posts
Is this: http://www.hobbyking.com/hobbyking/s...dProduct=13435 the same unit as the sunsky unit? Can I select 1280MHz frequency? Does it perform as good as the sunsky if it is not the same.
msev is online now Find More Posts by msev
Reply With Quote
Old Apr 02, 2011, 05:17 PM
Flying low is expensive.
pdiddyg40's Avatar
United States, CO, Boulder
Joined Jul 2008
2,398 Posts
Quote:
Originally Posted by iacei View Post
1 question: does it loose power during voltage decrease?

Link to the Vtx?
Well as the voltage drops, the wattage would drop as well assuming the amps don't increase.

Alex, that was a wonderful test, I've been using the exact same VTx and was never really sure what channel was 1280. Its kind of a shame that the lower channels (1-3) put out more power than channel F does. Oh well.
pdiddyg40 is offline Find More Posts by pdiddyg40
Reply With Quote
Old Apr 02, 2011, 06:01 PM
First to go over 106K feet
Crist Rigotti's Avatar
United States, TX, Waxahachie
Joined Mar 2008
2,482 Posts
Quote:
Originally Posted by msev View Post
Is this: http://www.hobbyking.com/hobbyking/s...dProduct=13435 the same unit as the sunsky unit? Can I select 1280MHz frequency? Does it perform as good as the sunsky if it is not the same.
No it isn't. Notice the wire leads and where they come out of on the HK one.
Crist Rigotti is offline Find More Posts by Crist Rigotti
Reply With Quote
Old Apr 02, 2011, 07:34 PM
Registered User
Italia, Emilia Romagna, Modena
Joined Mar 2009
413 Posts
what is the best configuration with 2,4radio?
1,2ghz+filter, 900khz or 5,8ghz??
arnaldo26 is offline Find More Posts by arnaldo26
Reply With Quote
Old Apr 03, 2011, 05:00 AM
Registered User
Luxembourg
Joined May 2009
806 Posts
Quote:
Originally Posted by arnaldo26 View Post
what is the best configuration with 2,4radio?
1,2ghz+filter, 900khz or 5,8ghz??
If you are happy with the performances of 5.8, go with it (good picture, small antennas, lightweight but expensive and not for medium to long range.)

Otherwise it depends on your 2.4Ghz if it s a Frsky then go for 1.2

If you have a cheap HK v1 Tx you better directly buy a filter but even with that you won't go over 1km so be careful.
iacei is offline Find More Posts by iacei
Reply With Quote
Old Apr 03, 2011, 07:22 AM
Registered User
Italia, Emilia Romagna, Modena
Joined Mar 2009
413 Posts
Quote:
Originally Posted by iacei View Post
If you are happy with the performances of 5.8, go with it (good picture, small antennas, lightweight but expensive and not for medium to long range.)

Otherwise it depends on your 2.4Ghz if it s a Frsky then go for 1.2

If you have a cheap HK v1 Tx you better directly buy a filter but even with that you won't go over 1km so be careful.
i use assan 2,4
arnaldo26 is offline Find More Posts by arnaldo26
Reply With Quote
Old Apr 03, 2011, 07:37 AM
Registered User
Joined Sep 2010
2,419 Posts
What are your thoughts about the turnigy v2 frequency hopping units?
msev is online now Find More Posts by msev
Reply With Quote
Old Apr 03, 2011, 11:59 AM
Registered User
Luxembourg
Joined May 2009
806 Posts
Well it s a bit better but even a Futaba Fasst has problems over 1km

Thing is with 2.4 stock you will wonder "when will my RC link go into failsafe?". If you stick to it then a cheap way to increase your range is the filter + Windsurf antenna from freeantennas. And then go for a booster if needed but watch out for LOS.

The size of your plane matters also, if it s big you can have distance between Vtx and RC.
iacei is offline Find More Posts by iacei
Reply With Quote
Old Apr 03, 2011, 01:53 PM
Ikaruswannab
Joined Sep 2009
977 Posts
I use Fox-800 (on 1280) and a Graupner MX-12 RC Tx that i have modified to 2.4GHz with a Corona V2 DSSS module and all that on a SlowStick with EZ* wing.
So far i have been 1Km out at a height of not more than 200m and no glitch or anything from both RC and Video.
Teo
teopbako is offline Find More Posts by teopbako
Reply With Quote
Old Apr 03, 2011, 02:19 PM
Registered User
Luxembourg
Joined May 2009
806 Posts
with a fox 800 and the stock config on 1280Mhz you can expect 4km of usable vid.


So your RC will be the weak link. Buy an autopilot and you will fly without any fear.
iacei is offline Find More Posts by iacei
Reply With Quote
Old Apr 03, 2011, 02:35 PM
Registered User
Italia, Emilia Romagna, Modena
Joined Mar 2009
413 Posts
i don't need of long range...i would like to have 1km...if i'll buy fox 1,2 with assan 2,4 i'll need the filter?
thanks
arnaldo26 is offline Find More Posts by arnaldo26
Reply With Quote
Old Apr 03, 2011, 04:03 PM
BEOWULF
North vancouver, B.C. Canada
Joined Apr 2008
18,649 Posts
email this guy to get a great deal on video tx's from dino dirrect

http://www.rcgroups.com/forums/showp...6&postcount=17
David22 is online now Find More Posts by David22
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Lawmate vs BOB Fox 700 Tx/rx combo which one has the 1160? iacei FPV Talk 24 Jul 22, 2010 09:49 AM
Discussion 1.2Ghz Tx Only: Where to buy a cheap one iacei FPV Talk 9 Jun 07, 2010 03:03 AM
Question esc all one, can i change to different tx/rx? Fossy313 Beginner Training Area (Aircraft-Electric) 4 Jan 30, 2010 05:07 AM
Discussion 1.2Ghz 800mw video TX/RX on Ebay for $2.98 Euro _Spud_ FPV Talk 1 May 23, 2008 01:31 PM
Are 1.2ghz Tx and Rx any good. JustFly Aerial Photography 3 Apr 22, 2005 12:46 PM