Thread: Discussion Hitec Aurora 9 Transmitter
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Old Sep 03, 2009, 06:47 AM
A.T. is offline
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Aurora A9 Warning Alarms, Battery voltage levels and consumption

UPDATE - Error page 62 in printed manual - refer picture attached.
CAUTION -Leave "Auto Power Off" set as "'Never"" when using a Lipo Battery.
"Auto Power Off" is Hibernation Mode only (as with laptops).
TX Does Not Switch Completely OFF and batteries will be completely drained if TX switch is not
manually moved to the off position in good time.
Will read as 'Auto Hibernation mode' with next update.
As with all similar items, Hitec RCD recommend battery be removed and stored separately if TX
is to be stored or unused for a period.

Dec2010: The screen wording of "Auto Power Off " was recently changed to "Auto Hibernation" to
further emphasise the Aurora would be hibernating, and not turning all the power off.


Extract from short form manual (relating to system) already published by FCC with their approval for use of the system:

1. START UP WARNINGS - as per attached extract from manual.
Aurora A9 - Firmware Update V1.07(1) & HPP-22 V1.04 - 01Oct10.
Permits user to set start up warnings On/Off and others e.g. gear switch position using "flight conditions"
(refer PDF update enhancements which include
- Touch Beep Sound On/Off Function: You can turn on and off touch screen
button sound.
- Warning Selection at Start up Function: Now you can choose to turn on or
off for two conditions of startup warnings (Abnormal Throttle and Flight Condition)
- set failsafe via HPP-22)


2. LOW BATTERY WARNING:
2a. Spectra 2.4 Module, unless reset using HPP-22, will recognize a receiver battery type
automatically among 4 cell and 5 cell NiMH and 2 cell LiPo Battery.
Red LED will blink fast with three continuous beeping sounds for low battery warning.
However under certain circumstances, a constant beep may also be heard, refer
AFHSS - Aurora & Spectra 2.4Ghz module - Warning Beeps extract:
.""Battery Low Voltage Alarm1. Voltage alarm may or may not sound on Aurora when RX/Power battery is disconnected.
This is because the telemetry cycles about 3 times/second. Sometimes when you are unplugging
the battery, it will sense the voltage drop and the warning will kick in, but sometimes it won't
because once you unplug the battery there is no signal going back to the TX.
This alarm is "hit and miss" due to the way the system works.


2b. Optima Transceiver (RX) - A123 2S Cell
- Low Battery Warning Auto for 4-5 cell NiMH & 2S Lipol is not adjustable for A123 2S. for Aurora V1.03<06 with Spectra V1.0.
However, Aurora V1.07+ & Spectra V2.0+ provide user adjustable warning settings between 4.0 - 35.0V.
(both via Aurora internal alarm setting for each model and the Spectra's internal alarm fixed setting via HPP-22)

2c. Aurora & Optic 6 Sport & Optic 52.4Ghz Transmitters - Low Battery Alarms:
Aurora -The alarm is fixed at 6.9v no matter what type of battery you use which
still gives you plenty of time to land after it goes off.
The user adjustable voltage cut off is for safety so not to over discharge the Lipo just in case you accidentally leave your radio on.
Refer manual page 62 for setting Lipo cut off from 6.0v< 6.6v .
FYI: When using Lipo in Aurora, user can set the cut off voltage in the power menu from 6.0 - 6.6v
but be aware this is the safety cut off and your radio will turn off at that voltage to prevent the Lipo from being discharging too low.
Also... NEVER try to charge it (lipo) in the radio - Mike".
Refer manual page 62 for setting Lipo cut off from 6.0v< 6.6v.


Optic 6 Sport - Caution - The TX low battery alarm (LBW) is fixed at 6.6v for NiMH.
Optic 5 - Caution - The TX low battery alarm (LBW) is fixed at 6.6v for NiMH.
Be aware that if using Lipo in an Optic 5 or Optic Sport, land without delay as very little time remains.

3. RANGE-OUT WARNING: [Does Not Apply - REFER LATER AMENDMENT BELOW] some manuals incorrectly include:
"Depends on the area you fly, as well as your model’s flight condition the maximum range also could be varied.
Approximately 200 meter before your plane loses connection the range-out warning will be activated and start warns you with the alarm sound.
Both LEDs will blink rapidly." ex HITEC SPECTRA 2.4 Transmitter & OPTIMA 7 Receiver USER MANUAL


4. TX Voltage Display - Hitec Aurora 9 (also applies to other transmitters)
How to read and interpret the voltage or % display shown on screen.

5. Aurora A9 - Run Time with Stock 1300 mAh NiMH Battery extract:
" Aurora Transmiter Battery Life can be extended by:
. 1. Setting screen back light power to Auto Turn Off
- from 10 sec on, 20 sec on, 1 min on, 10 min on, 30 min on, 1 hour on Always On or Always Off.
. 2. Auto Power Off setting: 10 min, 20 min, 30 min, 1 hour or Never.

Current Drain : 300 mA - all on full time.
. Fly RC Review (pdf) reports:
"Based on a tested discharge rate of 175mA— quoted conservatively at 190mA, the
stock 1300mAh pack will deliver around 6 hours of run time"
- User reports vary 4.0 to 5.5 hours, again depending whether screen on full time. "


. A123 pack cannot be used due to both size and the lower voltage
. LiFE battery should not be used in the A9 because the voltage is too low.
A 2 cell LiFE has a nominal voltage of 6.6 and a full charge voltage of 7.2.
They usually drop to about 6.8v pretty quick so it will be under the low voltage alarm
of 6.9v in just a few minutes.


Current Drain : 300 mA
(Hitec Spectra 35, 36, 40 or 72 Mhz:
RF Output Power: 400mW
Current Drain: 180mA +/- 20mA
Hitec HPF-MI Standard 35, 36, 40 or 72 Mhz Crystal based module spec
Output Power: 400mW
Current Drain: 150mA +/-
Length: 2-1/4" (56mm) Width: 1-1/2" (39mm) Height: 1/2" (13mm)


RX: Optima series receivers:
Operating Voltage: 4.8~7.4V From a receiver battery, or a speed controllers (ESC) power.
(7.4v is nominal = 8.4 max with fully charged 2S lipo battery)

4.8~35V Using SPC function (35V is the Maximum, do not exceed)
(Aurora A9 RX Voltage on Screen SPC voltage has preference over BEC voltage if using tap.)

Current Drain : 190mA
Optima RX - Installation RX, BODA Antenna, Volts & Range Test.. Quote:
"Notes 1. a. Reset voltage is 3.5v. The cause of many problems with 2.4 systems
is when people use low power 4 cell packs with high torque servos and they brown out.
Optima cut off voltage is 3.5v, so we suggest a 5 cell+ pack for the servos, or use the SPC
to power the RX for additional safety.
A small 2S lipo to SPC would guarantee the RX voltage would never sag. "

Battery Requirements/Provisions - recap.
Aurora Transmitter Battery: Default is for a 7.2V Ni-Cd or Ni-MH.
. 2S Lipo can be used.
However, if you elect to change setting to Li-Po, you can modify the transmitter
shut down voltage from 6.0V to 6.5V in 0.1V steps.
[Li-Po manufacturers do not recommend allowing a cell to drop below 3 volts.]
Alarm still sounds at 6.9v thus providing say 10-20 minutes before TX turns off
to prevent damage to battery and/or transmitter.

6. Hitec Transmitter Max Charge Rate through charge socket .09A due to overall circuitry.

7. Hitec Aurora, Eclipse, Flash, Optic & Prism series TX - Lipo and Field / Fast Charging

5Jul10 added: Aurora - Searchable Manual - PDF

Postscript:
Optima 6, 7 & 9 Basic Telemetry Includes Battery Voltage Level but not "Range Out warning".

14Oct10 - Update - Enhanced
Telemetry - Battery Voltage via SPC for EP Models with pictures.
AFHSS - Warning Beeps Aurora & Spectra Pro. - meanings.

ex Hitec USA Support Forum Sticky:
Aurora 9, AFHSS Spectra Modules, Optima Transceivers, Minima Receivers
& Telemetry
- FAQ & Undocumented Features
- Mixes, Setups, Tips. {Individual Links often updated}


Alan T.
Alan's Hobby, Model & RC FAQ Web Links
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Last edited by A.T.; Mar 10, 2013 at 08:22 PM. Reason: attach LBW manual
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