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Old Sep 30, 2011, 12:13 PM
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FRSky short range

Hey guys , any idea why I only get 1km of range before the RSSI indicator starts beeping?

FrSky 2.4G 5db module antenna
5.8ghz video.
GPS is not connected.
600tvl super had board cam
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Old Sep 30, 2011, 04:29 PM
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Don't sweat till it double beeps , turn round and hold your transmitter high when it triple beeps . Ensure your rx antenna are correctly polarised and not bent flat in the wind.

Nick
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Old Sep 30, 2011, 04:45 PM
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Make sure the receiver antennas are away from cables and the rest of the electronics. This is the very first thing you have to do when dealing with RF signals transmission.
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Old Oct 07, 2011, 01:42 PM
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lol get the antennas right ! 90 to each other, an away from that cable ! : D
glad you make it ONE km with this mess ^^
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Old Oct 07, 2011, 02:55 PM
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Quote:
Originally Posted by V_Okto View Post
lol get the antennas right ! 90 to each other, an away from that cable ! : D
glad you make it ONE km with this mess ^^
yea ur right , bloody mess... small space + too long cables (as I move this fpv system between planes).
by 90 to each other , do you mean one antenna pointing vertical and the other pointing horizontal? or both horizontal just like in a L shape?
Got it cleaned up a bit .. the battery is very close , should that affect the range?
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Old Oct 07, 2011, 03:25 PM
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Be sure that one of your Rx antennas is vertical.

Generally speaking though, the stock RSSI alarm level is set very high (conservatively)
so if you're using stock power levels at Tx, it's not surprising that you're hearing first
level beeping at 1km. I get it while flying my sailplanes visually. With a 1W booster
the RSSI will stay above alarm level out over 3km.

ian
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Old Oct 07, 2011, 03:29 PM
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Was looking at the manaul , and it says ;

Quote:
Please make sure that the two antennas are separated and oriented 90 degrees to each other.
This will guarantee sufficient reception regardless of aircraft orientation.

If possible, put the tip of the antennas outside of the fuselage for the best reception.
Does not say anything about vertical / horizontal placement ... so I guess this will be ok then... outside the aircraft
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Old Oct 07, 2011, 03:34 PM
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Oh really , so no need to panic then... got no RTH on the plane , so I would hate to loose it due to lost rc link.
Thanks for the info !!

Quote:
Originally Posted by Daemon View Post
Be sure that one of your Rx antennas is vertical.

Generally speaking though, the stock RSSI alarm level is set very high (conservatively)
so if you're using stock power levels at Tx, it's not surprising that you're hearing first
level beeping at 1km. I get it while flying my sailplanes visually. With a 1W booster
the RSSI will stay above alarm level out over 3km.

ian
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Old Oct 07, 2011, 03:37 PM
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No, that's not ok.
What they're not telling you is that those antennas and the one on your Tx are linearly polarized,
which means the greatest received signal strength is when both Tx and Rx
antennas are lined up with each other (parallel to each other). Ideally that is Tx vertical
and Rx vertical. When Tx is vertical and Rx antenna is turned 90 degrees, the signal strength
drops by about -25db (~16x reduction in range). If Tx antenna is pointed
at Rx or Rx antenna pointed straight at Tx then it drops even further.

You could orient the Tx antenna horizontally to use with your Rx antenna layout, but there
are a couple aircraft orientations that would have one Rx antenna pointed straight
at Tx and the other one 90 degrees off. In *practice* it is best to orient
the Tx antenna vertically and ensure that one of the Rx antennas is also vertical.

ian
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Last edited by Daemon; Oct 07, 2011 at 04:27 PM. Reason: math correction
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Old Oct 07, 2011, 03:40 PM
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That makes sense, got to make one of them point up then :-) thx !!
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Last edited by octane81; Oct 07, 2011 at 04:12 PM.
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Old Oct 07, 2011, 05:55 PM
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I'm going to be running the same gear in my new FPV, I'll see if I get any further.
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Old Oct 07, 2011, 06:14 PM
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Yes please do , and report back... I will do a new test tomorrow... but so far the RSSI have startet beeping at about 1 - 1.2km.
But now ive got the antennas sorted , so hope I will get a bit further tomorrow.. will see!
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Old Oct 08, 2011, 10:49 AM
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Did a new test today , but still only got about 1.3km range before it started beeping 1 time and 2 times.... guess it could be like a signal fade point , and I could fly through it... but I think I need to more ground range testing.
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Old Oct 08, 2011, 11:47 AM
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Daemon layout is best when you fly far and low.
If you fly high over head, then is best to have both plane antennas horizontal, at 90 degrees, and Tx antenna horizontal also.
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