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Jun 25, 2012, 08:44 AM
Registered User
Question

frsky range check w/ telemetry


just got the frsky system (djt, d4r-ii, fld-02, etc). looks like a nice system.

how do you guys perform the range check? the manual says
- place rx antennas horizontally (right angles) but 2ft up
- place tx antenna vertically (orthogonal to the rx antennas)
- set tx to range check mode, walk 30 paces (meters?) and verify control

do you hear the rssi warning beeps as you walk away from the radio? i get the occasional beep after just a few paces from the rx.

i have an fld-02 display that shows the rssi value. even just after a few paces, the rssi value drops rapidly to around 50 (close to the 45 threshold). at 30 paces. it can hover between 40 and 50 and is beeping often. i think i still have control. is this normal and expected?

so, do you guys use the rssi warning beep (or fld rssi display) as an indicator for the range test?

thanks!
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Jun 26, 2012, 11:10 AM
FPV Crash Dummy
igorp's Avatar
You will get beeps, but you should be able to get say 100ft away and still have control of the surfaces.
Jun 27, 2012, 02:40 AM
Registered User
The "orthogonal to the rx antennas" statement is wrong and I am very curious to see in which manual you read this...
The universal rule is: Tx antenna must be parallel and not colinear with at least one receiver antennas.
Jun 27, 2012, 03:52 AM
Registered User
Quote:
Originally Posted by RENATOA
The "orthogonal to the rx antennas" statement is wrong and I am very curious to see in which manual you read this...
The universal rule is: Tx antenna must be parallel and not colinear with at least one receiver antennas.
you're right that the manual did not state those specific instructions (only just that the tx antenna is vertical). however, in range check mode, shouldn't we verify that we still have control of the rx in the worst case condition (orthogonal)?
Last edited by noobee; Jun 27, 2012 at 03:58 AM.
Jun 27, 2012, 04:07 AM
Registered User
If you want it this way, you are right.
Orthogonal is not the worst case, it 26dB signal drop "only" i.e. about 20x range decrease.
The worst is when both receiver antennas and Tx antenna are collinear, i.e. pointing to each other, theoretically this is an absolute null signal case.
Last edited by renatoa; Oct 08, 2012 at 11:54 AM.


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