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Author Topic: RSSI questions - Immersion Vortex + EzUHF  (Read 1072 times)

Steve W

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RSSI questions - Immersion Vortex + EzUHF
« on: March 10, 2018, 11:53:17 PM »

! No longer available


Just wondering if anyone can explain what's happening in the video...

1) why is RSSI going higher the further away I'm getting?
2) why is it fluctuating so much
3) what is the symbol in the top right representative of?

Setup:
EzUHF w/ Diamond SRH-771 antenna
4ch receiver, CPPM with UPSTAT set on Ch10 for the RSSI information.

Setting RSSI, or UPSTAT on any other channel, prevents the RSSI information from displaying - that is the only configuration I can get to work.
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Dillwhacker

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Re: RSSI questions - Immersion Vortex + EzUHF
« Reply #1 on: March 11, 2018, 10:48:21 AM »

The only thing that comes to mind is it could be decibels (dB) below some reference figure. If so, it will drop off rapidly in the first few metres, then slower and slower the further out you get, and will fluctuate depending on antenna orientation and a million other factors. When it reaches the noise floor of the receiver, you lose control. I have tested the fail point by hiding the transmitter (on low power) indoors and walking around with the model behind obstacles to block the signal whilst watching the RSSI.
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English Turbines

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Re: RSSI questions - Immersion Vortex + EzUHF
« Reply #2 on: March 11, 2018, 01:00:37 PM »

  The signal looked inverted to me Steve....Have you programmed your receiver to output Link Quality OR RSSI?

 It should all be documented how to set this up exactly, its all immersion stuff isn't it?

I know one thing for sure, those pretty Sanders antennas are useless....add some wire of equal length to the ground converting it into a Dipole. It can be soft wire running at 90 degrees to the active element, it will still work ok.

                                                                                                :vulture:
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Steve W

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Re: RSSI questions - Immersion Vortex + EzUHF
« Reply #3 on: March 11, 2018, 01:25:12 PM »

It's set up as per the manual.

Both on 1.53, CPPM and outputting UPSTAT on channel 10. There's nothing really to configure so it must be a firmware issue inverting the RSSI.

I'm probably in a null-zone from the transmitter as I'm using the JR module so the antenna is pretty much pointing towards the quad - must remember to hold it at an angle so the antenna is straight upwards.
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English Turbines

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Re: RSSI questions - Immersion Vortex + EzUHF
« Reply #4 on: March 11, 2018, 02:48:06 PM »

It's set up as per the manual.

Both on 1.53, CPPM and outputting UPSTAT on channel 10. There's nothing really to configure so it must be a firmware issue inverting the RSSI.

I'm probably in a null-zone from the transmitter as I'm using the JR module so the antenna is pretty much pointing towards the quad - must remember to hold it at an angle so the antenna is straight upwards.

 It's worth checking out the TX and RX Firmware are matching and up to date I suppose....You could be right about the null zone too....I never need to run on anything but Lo TX output, especially after I did the Dipole mod to the Sanders antennas.
   Yes, the SR771 would benefit from being vertical, it's why I made that bracket for my TX to keep it upright.
 Some of the other elements on your OSD also look inactive..?

  I know you are channeling everything on Upstat via channel 10, but, you still need to programme your receiver to output either RSSI OR Link Quality dont you..?
                                                                                              :vulture:




« Last Edit: March 11, 2018, 02:55:44 PM by English Turbines »
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Nothing beats the smell of Jet-A at 800 Celsius...:)
Falcon UHF & 1280mhz Video.
SW1900 & Storm.

Steve W

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Re: RSSI questions - Immersion Vortex + EzUHF
« Reply #5 on: March 11, 2018, 04:12:04 PM »

Well I don't know - are you asking or telling? Apparently I've followed the manual to the letter but it's not right (as far as I can tell).
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English Turbines

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Re: RSSI questions - Immersion Vortex + EzUHF
« Reply #6 on: March 11, 2018, 08:56:44 PM »

 :sparta:
Well I don't know - are you asking or telling? Apparently I've followed the manual to the letter but it's not right (as far as I can tell).

 Actually Steve, I think the symbol in the upper right corner is the antenna symbol and the 100 value is your RSSI signal strength.  If you watch closely, it does drop momentarily when you are furthest away.

  The fluctuating value upper left corner may be dropped packets and the RSSI characters are simply not positioned correctly on your OSD?

                                                                                                :vulture:                                                                                             
 
« Last Edit: March 11, 2018, 09:05:45 PM by English Turbines »
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Nothing beats the smell of Jet-A at 800 Celsius...:)
Falcon UHF & 1280mhz Video.
SW1900 & Storm.

Ratty

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Re: RSSI questions - Immersion Vortex + EzUHF
« Reply #7 on: March 12, 2018, 12:05:57 AM »

That is how EZUHF has always been, it is backwards. I think 155 is the max the reading will go to. so 155=0 but cant quite remember. Turn off the Tx and youll see the max number.

Top right is signal quality (100) and packets lost (0) if i remember correctly.

I am not 100%, as it has been many years since playing with my wings, but that is how i remember it.
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Steve W

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Re: RSSI questions - Immersion Vortex + EzUHF
« Reply #8 on: March 12, 2018, 12:59:21 AM »

Just done a quick test...

So when I'm sat with it on, the RSSI sits at 0 to 5 .... if I point the antenna at close range it goes up to 100, which I imagine is just massive interference?

TUrning the transmitter off, the RSSI goes to 75, Bad Packets incremements by 1, and the Link Quality goes to 0.
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English Turbines

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Re: RSSI questions - Immersion Vortex + EzUHF
« Reply #9 on: March 12, 2018, 09:58:31 PM »

Just done a quick test...

So when I'm sat with it on, the RSSI sits at 0 to 5 .... if I point the antenna at close range it goes up to 100, which I imagine is just massive interference?

TUrning the transmitter off, the RSSI goes to 75, Bad Packets incremements by 1, and the Link Quality goes to 0.


  I think you should start by identifying what the features of the OSD actually are?  I mean, I assume you can move each feature exactly where you want it and delete those you dont need?
  If you modify the Sanders to a Dipole, it won't matter anyway, even on Lo TX output, you won't run out of range.  I never even run mine on Hi, even 4kms out, its still got loads in hand.
  I started reading the Vortex 250 Manual, and gave up, its not very good is it.? It also looks outdated as isnt it combined with Betaflight..? Betaflight is constantly changing isn't it?

 Id settle for using the Link Quality only in the OSD, I think it will work better anyway....You can only programme the RX for one or the other can't you? Sounds like the Link Quality is working as it should from what you said, and the RSSI is bollox, ie inverted.

                                                                                               :vulture:



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Nothing beats the smell of Jet-A at 800 Celsius...:)
Falcon UHF & 1280mhz Video.
SW1900 & Storm.
 

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