User Manual HELI ALT Hold Unit
Contents
1. entrance position as well as the take off altitude Here want to say that if the height is set for example to 20 meters it does not mean the heli would go to 20 meters above the take off point and hold there It means It will go always to the same altitude but it does not have to be exactly 20 meters because of the thinks mentioned above The low voltage influence was already spoken about If you really intend to work with this feature a lot and the entered altitude does not refer to the really maintained you can make a calibration chart for your set up where entered altitude would mean different altitude really maintained MAINTAIN PREPROGRAMMED ALTITUDE is switched on by the three position switch flipped to the high position servo signal bigger than 1 7 ms Pitch servo menu Determines how brutal or smooth the ALT Hold keeps the altitude You must give it a try Start with the 50 of the setting If it is too lazy increase This menu determines the maximum collective down movement from the hover point While setting it watch the swash plate It must go down Realize The more the ALT Hold activation altitude differs from the PREPROGRAMMED ALTITUDE the bigger offset from the hover point is going to be used It is the ALT Hold maintain altitude logic Think of it when flying and test it to know what to expect from your helicopter This menu determines the maximum collective up movement from the hover point While setting it2. signal for the collective pitch function HELI ALT Hold may be powered from the receiver battery as well as from an external pack plugged directly in to the unit If you decide not to use the external battery be aware of this The RC battery must supply voltage from 4 8 up to 6 5V If it drops below 4 8V the internal barometric pressure sensor voltage reference will start working with a certain offset In reality the HOLD PRESENT LEVEL function will be not affected by this only the PREPROGRAMMED ALTITUDE will differ from the real maintained Example The voltage has dropped below the stated level The programed altitude is set to 15 meters The heli will maintain the height at 10 meters due to the low internal voltage reference All other functions would stay unaffected We suggest to use both types of powering the unit It will increase the safety of using the device The external battery would power only the HELI ALT Hold circuits without effecting the rest of the electronics on the helicopter The unit will always drew current from the battery with higher voltage Page 2 of 7 Transmitter setting 1 As you are already using some kind of stabilisation device the heli is set to H1 mode one channel for one collective function No mixing in the transmitter but on your machine using other devices 2 Select a three momentary switch used for ALT Hold enable channel Select the values for the three positions like this Low position
3. watch the swash plate It must go up Do not get confused by the and indication on the display It indicates the signal level only and has nothing to do with the collective movement This value could be negative or positive it depends on the servo reverse status The middle position of the collective pitch signal is the hover point of your helicopter for the given heli weight Example If the hover value is 1 50ms after settings and the Pitch servo min 0 27 ms than total maximum value for collective down is 1 50 0 27 1 77 ms This will be used as a max collective down move In other words Alt Hold would not drive the collective pitch behind this setting A ma Servo delay 005 als ma Change value Output Generator 1 18ms als u Change value Data stored S Page 6 of 7 The speed of the collective pitch reaction to go back to the desired altitude if the height was changed due to the outside forces wind or turbulence and so on 1 fast reaction 9 slow reaction Servo signal generator output very useful to free a channel on the receiver Typical use for a governor setting or gyro sensitivity setting Servo signal generator runs constantly It is not possible to switch it off All set parameters are stored in the internal memory BEFORE THE FIRST
4. FLIGHT Sey Supposing you have done the hover point calibration procedure Do it without hovering at first to learn the procedure Check all functions on your heli and on your transmitter We suggest you calibrate before each flight That way the sensor knows the altitude at the ground level This affects the preprogrammed altitude if you did not calibrate and then send the heli to the programmed altitude it would go to that height with respect to the last calibration Realize that atmospheric pressure changes Realize that various take off locations can differ by their altitude All this affects the sensor Note if you want to maintain present level the calibration does not matter How to do it Disconnect the HELI ALT Hold power supply Keep the calibration button pressed Switch on the power supply for the HELI ALT Hold unit LED must start blinking Release the button LED is still blinking Calibration time is 7 10 seconds Completed after the LED has stopped blinking Memorized until the new calibration ONOARONS Page 7 of7 Preflight test of the HELI ALT Hold unit functions on the ground Middle position LED OFF TX bar 2 1 ms l 1 5 ms 0 9 ms Low position LED ON Collective pitch controlled from TX it moves according to the pitch stick position Collective pitch controlled by the ALT Hold TX bar PILOT NOT IN COMMAND of the collective pitch 2 1 ms ALT Hold mov
5. HELI ALT Hold Unit User Manual HELI ALT Hold Unit Page 1 of 7 Technical data Batt 1 4 8 6V Operation voltage Batt 2 5 15V Current consumption 50 mA Operation temperature 10 70 Celsius Operation altitude above sea level 0 2500m Weight 30g Measurements 50x30x13 mm Connection schema Pitch RX HELI ALT Hold RC Receiver Intelligent control unit ver 1 1x Batt 5 15V JETI BOX lt Safety Accu Receiver Accu lt Cc Pitch RX servo signal from the receiver TX must be set to H1 Heli Mode Button external calibration button input Gen JLJL servo signal generator output Pitch pitch servo output Unit On Off receiver servo signal input LED indication LED output JeTi Box HELI ALT Hold unit setting input Batt external battery socket The HELI ALT Hold was designed to help the pilot maintain desired altitude when filming or taking pictures from RC helicopter It can maintain present altitude or programmed altitude As its side function it can generate constant servo signal to free a channel on the transmitter Example gyro or governor sensitivity setting It works only if there is another devise mixing the CCPM servos signals on the board of your machine For example Helicommand or similar devices The transmitter is set to H1 mode where each function operates only one servo HELI ALT Hold outputs only one servo
6. Middle position High position TX bar TX bar TX bar Ka Aa Volt Volt Volt 13 15 17 ms 13 15 17 ms 13 15 147 ms Low position servo signal width must be set below 1 3 ms typically 1 1 29 ms This position switches on the MAINTAIN PRESENT ALTITUDE The LED will light Pilot does not control the collective pitch function Middle position servo signal width must be set to 1 3 ms 1 7 ms typically 1 31 1 69 ms This position disables the ALT Hold The LED is not active Pilot controls the collective pitch High position servo signal width must be set higher than 1 7 ms typically 1 71 2 1 ms This position switches on the MAINTAIN PREPROGRAMMED ALTITUDE The LED will light Pilot does not control the collective pitch function Servo signal width leaving the receiver should be kept in these limits Min signal from TX Max signal from TX Volt Volt 09 15 21ms 09 15 21ms Page 3 of 7 Programming the althold by JETIBOX Step 1 connect the JeTi Box 2 Step 2 connect power supply 0 90 5 2 O HELI ALT Hold Intelligent control unit MANILA ver 1 1x Pitch RX Button Gen JL FL P Pitch gt Unit On Off B gt Led gt JeTi Box gt Batt 5 15V Pitch RC Receiver a a Unit On Off
7. a a JETI BOX Hg Receiver Accu First connect the JeTiBox JeTi Box will show initial menu and you can start the setting see JeTi diagram AltHold HELI ver 1 xx Last held alt 0000 m ma Select settings 4HELI AItHLD gt gt g Hover weight 1 A 4SET ww Hover weight 2 4SET v a Hover weight 3 A 4SET DisconectJeTiB Then calibrate JETI BOX i gt Select heliweight 1 5ms Heli weight 1 vV Altitude 1 4ms 121m Y A Pitch servo min 1 3ms 0 21ms v 4 Pitch servo max 0 18ms vy Servo delay 005 Vv a Output Generator 1 18ms Disconnect JeTiBox V a Data stored FT ea eae HENNE AltHold HELI menu AltHold HELI ver 1 xx vy Last held a
8. es the swash plate to the hover A point as it maintains present level In the meantime the present altitude is saved in I the menu LAST HELD ALTITUDE Is it there 1 5 ms NAT It should display 0000 or 0001 as the heli did not climb anywhere still being on the ground a 0 9 ms High position LED ON NN Collective pitch controlled by the ALT Hold PILOT NOT IN COMMAND of the collective pitch ALT Hold moves the swash plate some distance above the hover point as it wants to climb to the programmed altitude The more the programmed altitude differs from the ground altitude the more the collective pitch moves TX bar 2 1 ms ly L areas 1 5 ms Of course you must have entered the programmed altitude beforehand 0 9 ms Important notes When the ALT Hold is on you are not in control of the collective pitch Be always prepared to switch the ALT Hold off When switching the ALT Hold modes in flight make sure the TX collective pitch stick is close to the hover position If it is not expect sudden altitude changes Example You send the heli to the programmed 50m altitude While enjoying the automatic hover you have shifted the collective stick down without knowing Than you switch the ALT Hold off The heli will jump in to a fast descent because your collective stick is in a negative pitch position YO YO EFFECT This does not refer to the Hold Present Level function but rather Go To The Preprogrammed Alti
9. f hover points Select hover weight number 1 to 3 Push the left arrow for SET after you can see what the arrow points at Disconnect the JeTi Box calibrate meaning in flight Switch the three position switch to the middle position LED does not light Hover the heli at a height where it is not influenced by the ground effect If happy with the way it hovers flip the switch from middle to any position Return the switch to the middle position This is important If you do not return the switch the ALT Hold will monitor the collective pitch signal until you land and switch off the battery This will result in to saving the collective pitch position at the time of switching off the battery You can do this procedure how many times you want The hover point value is stored when the switch is returned to the middle position 7 Land and switch the power off Hover point calibration for this particular hover weight has ended Repeat this procedure for each heli weight number with the appropriate payloads added to the helicopter If you are already using the spare battery do not forget to switch it of as well as the RC battery We suggest going through the calibration without the auxiliary battery to make the switch off and on process easier The following steps are just for checking that the unit really saved different values for each hover point They are not important for the calibration 8 Connect the JeTi Box again and swi
10. ltitude menu Last held alt 0000 m vv Select settings menu A a Select settings 4HELI AItHLD gt A gt Page 4 of 7 This would give the gadget name as well as the software version The last HOLD PRESENT ALTITUDE command will memorize its actual altitude to the internal eeprom It will stay there until the new record HELI Here you calibrate the hover point in presence of three pay loads AItHLD Here you choose the payload and enter the height if desired Hover weight menu Number of the payload set a Hover weight 1 SET 1 5ms eoe Last stored value Disconnect JeTiB Then calibrate k Hover point setting See ID Gi Purpose The HELI ALT Hold needs to know where the collective hover point is carrying different payloads We have included three heli payload combinations to satisfy general needs If the payload is switched during the job you just enter a different heli weight number of the set up already calibrated Hower weights 1 to 3 We suggest using the three possibilities like this Hover weight 1 Without payload for testing reasons Hover weight 2 Intended to use with the camera and cradle added weight Hover weight 3 Intended for the video camera use How to do the calibration o
11. tch the power on 9 Find the menu Hover weight 1 or the hover weight you are working on 10 In adequate menu check the Last stored value There you can see the stored value of the new hover point DNahwn Select settings 4HELI AItHLD g Heli weight menu gt Select heli weight Heliweight 7 Altitude menu als v Change value Altitude 121m Pitchservo menu Change value UD Pitch servo min 0 21ms Change value ma Pitch servo max 0 27ms Change value Page 5 of7 ALT Hold menu Here you set the ALT Hold functions Programmed altitude for each heli weight Positive and negative Pitch offset from the hover point The ALT Hold uses this to move the collective signal in order to maintain the level servo signal generator to free a channel if needed follow the diagram for the setting Select the heli weight for which the following settings will be made Altitude Note Altitude value is valid for all 3 heli weights This comes handful if you want to take pictures from a desired altitude level You set it here and the heli will go there after the function is switched on The actual precision is given by the sensor tube
12. tude It happens when the heli is higher than the programmed level The more the activation height differs from the programmed altitude the bigger the yo yo effect is Example Programmed level 70m Your heli is at 150m There you switch on the Go To The programmed Altitude The heli will start descend quite fast The height difference is big therefore the collective pitch down offset from the hover point is big as well The heli crosses the programmed 70m level stops somewhere about 50m and climbs to 70m to hold there Do not activate the Go To The Preprogrammed Altitude if the heli is much higher than the programmed level Also take in to consideration the weight of the heli and its power If the programmed level is set too low the heli could hit the ground due to the yo yo effect Avoid moisture do not blow in to the sensor tube touching it with the lips but only blow air distanced in to the tube to check the sensor is working Place the sensor tube entrance to a convenient place where there are no sudden pressure changes It could be right below the rotor blade holders inside the canopy below the canopy above the rear rotor It needs to be tried for each heli The tube entrance should be enclosed by some kind of foam that lets air go through easily Questions regarding the Heli Alt Hold can be sent via email info leteckafotografie com See the Alt Hold video use at www leteckafotografie com section Heli Alt Hold Product manufact
13. ured by www modelcam cz Heli Alt Hold is warranted to be free from defects in materials and workmanship for a period of one year from the date of purchase This limited warranty covers normal use and does not cover abuse or use not in accordance with this manual Under no circumstance will the seller be responsible for any incidental or consequential damages which may occur during the use of this product or as a result of the product s failure to perform
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