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Posted by visioneer_one | Apr 11, 2018 @ 11:14 AM | 1,475 Views
Originally Posted by hobbya
It seems to me there are two versions of this module:
nRF24L01: maximum power is around 19.5dBm (89mW). [HiSky]
A7105: maximum power is also around 19.5dBm (89mW). [FlySky]
CC2500: maximum power is only 17dBm (50mW), very bad. [FrSky]
CYRF6936: maximum power is around 18.5dBm (70mW). [Spektrum/Devo]
so I have these two modules.

tested both of them immediately upon receipt. Module #1 seemed to be consistently a little more powerful than module #2, but since both were putting out more than their rated 70mW in Spektrum/DSMX mode I figured that they were fine.

I did notice that I had a couple of odd failsafes which I didn't have with my actual Spektrum radios. Tested the modules again and the power levels were p much unchanged. I figured that teh stock ducky antennas were to blame. DId a bit of research and wanted to try one of the VAS 2.4 folded dipoles. These have standard SMA connectors; the modules are RP-SMA. I didn't want to use an RP-SMA to SMA adapter, so I ordered a short U.FL to SMA cable to replace the stock coax cable.

apparently I clicked on the wrong length!
stock coax is approx. 2", my replacement is 4"

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Posted by visioneer_one | Apr 04, 2018 @ 07:41 PM | 1,690 Views
finally got a valid sbus stream out of my 4-ch receiver.

Procedure :

- downgraded TX firmware from v3.00 to v2.11

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Posted by visioneer_one | Mar 01, 2018 @ 06:08 AM | 2,194 Views
$5 for a 5S balance lead, a pair of 2-pin JST plugs and two 1N4001 (1A 50v) diodes wired up in series and you can safely use a 3S lipo.

the 3 pins on the left go to the (-) rail, the other two are (+).

A little hard to see here, so click for gigantic. I have 2 sets of diodes connected in series on the (+) side, one set per leg.
(the dioded are the little lumps under the heatshrink.

Each diode drops the voltage by approx. 0.7V. 2 in series means that the radio never sees more than 11.2V even when the 3S lipo is fully charged.

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Posted by visioneer_one | Feb 15, 2018 @ 10:10 AM | 4,609 Views
There are a couple of options.

- *Genuine* Spektrum DM9 module : Expensive! PPM only, so somewhat laggy. No ModelMatch. DSM2 only, so some of the newer BNFs won't easily bind to it. No telemetry. Supports up to 8 channels.

- Spektrum "Hack" module : Affordable (when pre-built), PITA otherwise as you have to get the board, components and a donor DX5e/6e transmitter. No PPM->Spektrum conversion lag. Supports DSM2 and DSMX. Supports ModelMatch! Sends 6 channels only. No telemetry.

- iRangeX multi-protocol module : Cheap! Same basic advantages as the hack module, but it supports up to 12 channels and telemetry. The firmware is open-source and is being continually updated.
Posted by visioneer_one | Feb 03, 2018 @ 07:09 PM | 11,210 Views
So a test was requested...

Originally Posted by The Internet
Have you charged 6s packs in parallel with the 250w? If so could it do the full 10 amps?
I don't know. With 9 chargers on the table I never needed to run any one of them to their limits.

Let's Test

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