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Member postings for Mike Blandford

Here is a list of all the postings Mike Blandford has made in our forums. Click on a thread name to jump to the thread.

Thread: IRange module
16/07/2018 23:01:06

I doubt they actually know what the output power is! There are 4 RF chips in the module and a single power amplifier. On my DIY module I notice the RSSI readings when using FrSky protocol are lower than when using a real FrSky XJT module, so I reckon the output power for that is lower.

The chip for FrSky (CC2500) can output a max of 1dbm (before the power amp.).
The maximum for the NRF chip is 0dbm, the A7105 is 1dbm and the CYRF chip (for DSM) is 4dbm.


16/07/2018 19:34:03

This all started out as a DIY project, see: **LINK**

The firmware on the module is open source, see: **LINK**

The transmitted power may be adjusted in a header file of the firmware.


Thread: X4R receiver seems to be stuck in CPPM output mode
11/07/2018 18:21:16

The RX4R is a different receiver, the X4R is on the second page of receivers and there is more than one firmware download listed.

If you go to the "bars" display on the Tx, is bar for channel 1 moving?

It may be worth creating a new model on the Tx, if you haven't already done so, to rule out any odd settings on the Tx causing the problem.


Thread: FRSky DIY module
06/07/2018 14:21:27

The switch is to select the mode of operation:

1. Old "V" receivers (not "V-II" receivers).
2. "D" (telemetry) receivers and "V-II" receivers.
3. Firmware upgrade.


Thread: Can't get S8R to stabilise or auto-level
22/06/2018 21:39:15

You "run" the LUA script like the PC configurator program. It reads all the values you may configure on the S8R and lets you edit them. As an example, you could change the "Auto-level offset" for the elevator to correct the nose down of the twinstar, and you can do this on the flying field.

Also, if you find the stabilisation is too mild, and turning the channle 9 gain up doesn't give enough, you can increase the individual gain values in the S8R. They default to 50% for the aileron, 80% for the elevator and 100% for the rudder. All may be adjusted up to 200%. Again, using the LUA script, you may do this at the flying field (e.g. between flights).


22/06/2018 12:16:08

The "latest" items for the S6R/S8R are here: **LINK**. To see what "Quick Mode" is about, download the manual. Under "tools" you may download the latest PC config program (v.1.8.4), and also the LUA script.

In my opinion, it is well worth having the script on the Tx as it allows you to configure all the parameters in the Rx directly from the Tx.


22/06/2018 09:55:13

When "Quick Mode" was introduced, the configuration program on the PC was updated to add the option for setting it. The PC program is at, at least, V1.8.1. The LUA script also changed to add the required setting.

Be careful if trying to configure the Rx while in the model with servos attached. You may find the load on the USB port becomes too high and causes a problem on your PC. Using the LUA script on the radio is just as convenient, and doesn;t need the cable attached all the time.

Ian: The Rx should be fine with 2.1.9, but, as I just mentioned, you may need to update the configuration program on the PC and/or the LUA script.


21/06/2018 22:10:20

Since the S6R/S8R first came out, the firmware has changed to introduce "Quick Mode". This uses only channel 10 to select stabilise/auto-level and doesn't include knife-edge or hover. Quick Mode enabled is the default, so you will need to check this is turned off to use the same settings for channels 10 and 11.

There is a setting you may adjust if auto-level loses height. Using this you may just alter the pitch response while re-doing the "self-check" sets the roll response again as well.

Do you have the STK device to adjust the settings in the Rx, and/or do you have the LUA in your radio for doing this?


Thread: New Drone Laws from 30/5/2018
16/06/2018 15:38:59

A good result, well done from me.

I also did write (e-mail) to my MP and received a letter (dated 11th June) from him today. While much of the letter looks like a printed, standard reply, there is a handwritten P.S. saying " Given your expertise and concern I will pass this on to the Minister"!

I did include a picture of an electric glider (showing it isn't a multi-rotor) and a graph from a logged flight showing very little thermal activity below 400 feet.


Thread: FrSky Taranis - user chat
14/06/2018 12:14:24

Glad you could follow my instructions OK.


11/06/2018 12:36:22

Details for flashing the Orange module are here: **LINK**.


10/06/2018 22:57:30

This is a known problem with that module, there is something wrong with the firmware in it.
The only solution I know of is to update the firmware in the module with the MultiProtocol firmware, however this is not a straightforward operation as the module needs a special programmer (PDI). If you use Arduinos at all, I do have a method of using one to flash a bootloader to the module, then I also have a method of using that to flash the MultiProtocol firmware from the radio.


Thread: bullet connectors
30/05/2018 23:38:23

I use the same, male bullet on the battery positive. I also use short lengths of hardwood dowel (3/8 inch diameter) in which I drill a hole part way through that accepts the male bullet. I then put these over the battery positive connector to help protect from any accidental shorts. I only remove them for charging or when connecting in the 'plane. They are large enough that they don't get lost, I normally slip them into a pocket when a battery is in use so they are easy to find when disconnecting the battery.


Thread: QX7
29/05/2018 13:16:24

Yes it does only apply to ersky9x. The QX7 does include two connectors on the main board for extra switches, intended for switches on the ends of the sticks. Ersky9x also supports these for extra switches.


28/05/2018 22:34:24

Just been hacking my QX7!
Regarding extra pots/sliders, the QX7 has a three colour LED in the power switch (red, blue and green). I'm not sure this is very useful, indeed, on ersky9x, I only use the green LED. If the wires for the other two LEDs are disconnected, then those two signals on the connector are available as extra analog inputs, which seems more useful to me!



A bit of a tight fit, the slider is fixed using hot glue inside, and I also have a HC-05 bluetooth module just beside it and they only just fit together.

Details of the electrical connections are here: **LINK**


Thread: Blackhorse Hurricane 46
23/05/2018 18:59:35

To give some importance the the resistance outside the battery and motor, it is quite possible to find the total resistance of the wires, connectors and the ESC to be 20 mOhms (0.02 ohms).

Consider a 3-cell lipo delivering 40A compared to a 4-cell lipo delivering 30A (the same total power). The voltage loss in 20 mOhm for 40A is 0.8V, while for 30A is 0.6V.

Using a nominal 3.7V per cell, this is 7.2% of the 3-cell battery voltage, but only 4.1% of the 4-cell battery. For higher currents, the difference is greater.


Thread: Suppliers of 35 mHz crystals
23/05/2018 18:50:22

Be aware that you will probably need a Tx crystal that is for your specific transmitter. The way the FM modulation works, usually by "pulling" the crystal to a slightly different frequency, requires the crystal characteristics match the circuit in the Tx.
When I last used 35MHz I was using a synthesised module and receiver (Hitec) so didn't need crystals anymore.


Thread: Blackhorse Hurricane 46
23/05/2018 17:15:16
Posted by Nigel R on 23/05/2018 15:45:40:

Chris W

I disagree. Higher current doesn't equal higher losses . . .

For that to be true you also then need to use larger wires between the battery and the ESC and the ESC and the motor, probably bigger connectors (so they have a lower resistance), and an ESC rated at a higher current so it also has a lower resistance.


Thread: FrSky Taranis - user chat
15/05/2018 15:11:09

I've put openTx on the Taranis plus (release 2.2.1) and repeated the latency measurements. Because openTx doesn't (currently) synchronise to the XJT heartbeat pulse, and, in 16 channel mode, only sends one frame to the XJT every 9 mS, there is quite a variation in the latency, slowly changing over time.

The shortest latency I found was 19.3 mS, jumping to 37.3 mS, and the longest I found was 53.9 mS jumping down to 36.1 mS. These are times from control input to servo pulse. With the longer times, sometimes the SBUS output does occur 9mS before the servo pulse, so the 53.9 mS was 44.9 mS to the SBUS output.


Thread: Dead Lipo remedy?
14/05/2018 15:43:56

I'm just wondering, the OP said the pack registered nothing on a multimeter. I would have thought even a flattened battery would show some voltage rather than nothing, so perhaps the multimeter never connected to the battery properly. This would mean we don't know how low each cell dropped. It may be the battery wasn't actually too low in voltage, which might explain why it seems to have recovered.


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