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Jan 21, 2014, 09:36 AM
Registered User
I dont get why all people are so impressed by 16Ch PPM. If you calculate the frequency the PPM signal has with 16ch...

Normal 8Ch PPM: 22,5ms or 27ms frsky == 44Hz / 37Hz
16Ch: 16*2ms + sync frame >4ms? = 36ms at least. == 27Hz

As you can see 16Ch only has a bit less then half the frequency of normal 8Ch or 2/3 the frequency of FrSky PPM. So why would you want 16Ch ppm? The less the frequency the less the servo accuracy.

What do you need 16Ch for anyways?
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Jan 21, 2014, 09:57 AM
Registered User
I don't just stating a updated firmware is out soon lol
Jan 21, 2014, 10:33 AM
Registered User
Oh well...Lets see what they will add. Not much information out there yet...
Jan 21, 2014, 01:21 PM
Registered User
Actually I have got a project on my mind involving 16 channels. But say for example I settled for 15 channels instead, would that result in 15*2+4 = 34 ms, 29.4 Hz and 29.4/44 = 67 % "accuracy" compared to 1/0,036 ms/44 Hz = 63 % for 16 channels?

What is wrong with the software?

Rangarid, do you recommend the system and what kind of range have you achieved?
Jan 21, 2014, 01:54 PM
depronman
HI , and it work whith all osd ?
Jan 21, 2014, 02:02 PM
Registered User
I donīt have it but I donīt see why it wouldnīt work with any/all osd. It has RSSI output so if your osd has input for RSSI you could get the rc signal strange displayed via the osd.
Jan 21, 2014, 02:22 PM
depronman
I ask this, because i have write has foxtech to ask if the arkbird uhf worked with the cyclop storm osd and their answer: Hi sir,

The ARKBIRD-433UHF can't work with other osd.
It is difficult to adjust it to make it work with other osd.
Jan 21, 2014, 02:56 PM
Registered User
UHF is independent from OSD. Maybe thats what they mean is difficult with other OSDs with arkbird UHF:
Quote:
With Arkbird OSD, it has the following functions:
7. It can be configured to single-wire PPM&RSSI output, three-wire transmission of 10-channel signal and RSSI, with very simple wire connecting; (Arkbird OSD needs to be upgraded to 3.1020 or newer firmware)
8. The original channel 1-4 input ports on Arkbird OSD; automatically become output ports which will output channel 7-10 of the radio TX control;
9. Output channel 9 and 10 can be configured to steering A Servo-Stabilizing-Gimbal for camera. Positive or negative, and the amount of stability augmentation can be adjusted.
I dont have the system yet myself, but with good Antenna position and good 1/2 wavelength antenne (e.g. SRH-771 Diamond) 400mW mode should have at least 40km if you optimize everything. I have seen youtube videos with people that reached 33km with 100mW. It all depends on the antennas and their position.

I dont mean the rlink with 16 channels is bad, as you can adjust the channel length for rlink (2-16channels). I just mean in general that 16channels reduces accuracy. The less channels you have to transmit the smoother servo movement is. thats why in rlink manual they recommend 8 channels.

In general from the specs i'd definitely recommend the system as its only 150$ including (diversity!!!) rx and lots of features.
Jan 21, 2014, 03:05 PM
Registered User
double post...
Last edited by Rangarid; Jan 21, 2014 at 04:08 PM.
Jan 21, 2014, 03:12 PM
Registered User
Daemon's Avatar
Actually, the manual says.
"EXT port for extension, support Futaba Sbus and Spektrum/JR Satellite port and plan to
support Joystick control, etc."
but nothing more, about actual implementation.
Jan 21, 2014, 03:14 PM
Registered User
Oh you are totally right, overread that in the manual. I'm sorry. I thought he was talking about the HT port...

BTW maybe this thread should be merged with this one:
https://www.rcgroups.com/forums/show....php?t=2072354
Last edited by Rangarid; Jan 21, 2014 at 03:24 PM.
Jan 21, 2014, 03:54 PM
Registered User
OK, and I think the manual stated that 16 channels gave a 1-2 dbi loss compared to 8 channels.

Yea the specs really stand out considering the price. Just waiting for the range reports to drop in.
Jan 21, 2014, 04:07 PM
Registered User
Wohoo both threads have been merged together. Unfortunately now everything is mixed up Oo

Quote:
Originally Posted by ChrisP92
Yea the specs really stand out considering the price. Just waiting for the range reports to drop in.
10km was first report i saw:
https://www.rcgroups.com/forums/show...9&postcount=30
Last edited by Rangarid; Jan 21, 2014 at 04:14 PM.
Jan 21, 2014, 09:13 PM
Registered User
Daemon's Avatar
I'm pretty sure It'll go a bit further than that. I did a 74km (46 mile) ground range
test at 400mW (turns out it was really 900mW) with stock antennas (Tx on a high point, Rx in my car). I don't want to get into a lot
of details until I've had a chance to fly it in my usual high noise environment. No fatal flaws so
far though. Power consumption is a bit higher than average.
Last edited by Daemon; Nov 11, 2015 at 05:46 PM.
Jan 21, 2014, 10:29 PM
Registered User
satgod's Avatar
Quote:
Originally Posted by ChrisP92
If I want to run 16 channels on this system and use two 8 channel transmitters (turnigy 9x in ppm mode), will I have to use two receivers then, or can I use the 8 standard slots plus the ppm output to get 16 channels?
from what I read 1 tx and 2 rx's will give you 16ch


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