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Post by Trent on Dec 2, 2011 16:19:58 GMT -6
2.4Ghz? 72Mhz? DSS? What is all this mean!?!?
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Post by Trent on Dec 2, 2011 16:21:03 GMT -6
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roel
New Member
Posts: 9
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Post by roel on Jan 7, 2012 17:55:21 GMT -6
Come on Trent What important for FPV is not a 2 way system. Just send a signal and read the recieved data from a OSD
You have almost a HAM license You know that low frequentie penetrate much better then high frequenties.
Start with the 72mhz for FPV
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Post by Trent on Jan 8, 2012 7:10:33 GMT -6
Agreed. Did end up getting a HAM. I've got a 72 mhz and a 2.4ghz that I'll be doing range testing on with my 900mhz FPV system. The results should be interesting.
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Post by charlesb on Jan 10, 2012 9:40:55 GMT -6
Now that you got your HAM ticket . I would check out 1280MHz FM TV. On one of your video's you talk about 433MHz. I wouldn't even think about that. Don't forget that the higher in freq. you have for your video transmitter the more buildings and trees will effect the signal.
The 439.25MHz AM TV is less signal loss bye trees than 1280 MHz but 1200 is less than 2389MHz. Most Ham's on ATV use FM on 1200MHz and above. The signal on FM takes less increase in signal to go from a noise picture to a close circuit picture using Fm. Around 12DB on FM around 30DB on AM.
We have been into Ham TV (ATV) sense 1972.
if we can help YOU feel free to contact us.
CharleB
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Post by Trent on Jan 10, 2012 22:27:05 GMT -6
Awesome feedback Charles! I'm considering making my own skew planer wheel (spelled correctly?) for the 1280MHz band. I've found a few sites/videos that show you how to make them... I've got a 900MHz Tx and Rx, can I just replace the ducky antenna with my own 1280MHz antenna? And will the Tx/Rx start transmitting/receiving on that frequency?
Thanks for the help!
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Post by charlesb on Jan 11, 2012 20:47:28 GMT -6
Another good source for RF info is OldManMike on RCGroups
And for a Ground station/Autopilot HappyKillmore has a lot of knowledge . Don't forget your ground station will not have a fixed GPS location. It will be changing all the time. The ground will have to allow for that. HappyKillmore mite add that function for you in his ground station.
Good Luck.
Thinks twice and ask lots of questions to people in the know. Before you step off the cliff. LOL
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Post by happykillmore on Jan 28, 2012 10:57:11 GMT -6
From talking to IBCrazy, he says your best bets for video signal is 1.3 or 5.8 with much longer range on 1.3. For r/c radio he uses 72. He's not into UAV's yet but 900 is your best bet for long range with 2.4 as an alternate. From what I understand 900 no longer works well for video because cell phones are now using 900... But the xbees still work well on 900 because of the data checking algorithms on the xbees.
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roel
New Member
Posts: 9
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Post by roel on Jul 5, 2012 8:17:05 GMT -6
Trent The new record is made by Roberto Montiel. He made a flight of 100km out and back with: 800wm 1.3G video. Sherrer UHF 433 And rangevideo RVOSD 5.0 with RTH Antenna's from Circulair wireless Spain (sircana) www.vimeo.com/43074193 This is my lates video about UHF and 1.3G www.vimeo.com/43778348goodluck with the show
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