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Mar 26, 2011, 04:37 PM
Registered User
i had the same prob - it fixed itsself.. maybe the moving the vee at the coax connection...
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Apr 02, 2011, 02:23 PM
Engineer for Christ
IBCrazy's Avatar

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
Apr 02, 2011, 03:20 PM
Registered User
1 question: does it loose power during voltage decrease?

Link to the Vtx?
Apr 02, 2011, 03:52 PM
Registered User
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.
Apr 02, 2011, 04:17 PM
Flying low is expensive.
pdiddyg40's Avatar
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.
Apr 02, 2011, 05:01 PM
First to go over 106K feet
Crist Rigotti's Avatar
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.
Apr 02, 2011, 06:34 PM
Registered User
what is the best configuration with 2,4radio?
1,2ghz+filter, 900khz or 5,8ghz??
Apr 03, 2011, 04:00 AM
Registered User
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.
Apr 03, 2011, 06:22 AM
Registered User
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
Apr 03, 2011, 06:37 AM
Registered User
What are your thoughts about the turnigy v2 frequency hopping units?
Apr 03, 2011, 10:59 AM
Registered User
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.
Apr 03, 2011, 12:53 PM
Ikaruswannab
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
Apr 03, 2011, 01:19 PM
Registered User
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.
Apr 03, 2011, 01:35 PM
Registered User
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
Apr 03, 2011, 03:03 PM
Suspended Account
email this guy to get a great deal on video tx's from dino dirrect

https://www.rcgroups.com/forums/show...6&postcount=17


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