EzUHF Manual - ImmersionRC
Contents
1. ImmersionRC EZUHF R C Control System e Appendix B Diagnostics Problem Rx LED doesn t light Check BEC voltage and polarity Power the Rx via USB temporarily if this causes the LED to light and beat when the Tx is powered on then the BEC Rx pack should be tested Problem No response from the Transmitter The transmitter should beep three times when the R C transmitter is powered on If it doesn t try powering the transmitter via USB if the beeps are heard when powering this way the cable between the R C Tx and the EZUHF Tx should be investigated Problem Tx and Rx are correctly powered but servos don t move 1 Ensure that the R C transmitter is not in PCM mode this is a common mistake The transmitter must be in PPM mode in order for the EZUHF Tx to successfully decode the servo positions 2 Ensure that the UHF Tx and Rx have been correctly bound together See the section Binding earlier in this document Problem Tx beeps continuously even when not in Bind mode Beep codes can identify the source of the problem Combinations of long and short beeps will be emitted and can be identified using the following table Transmitter internal error return for service Xtal ine Transmitter internal error return for service TxOvfl e Detected PCM as opposed to PPM change R C Tx Mode to PPM ie eee PPM not detected at power up Tx connected to HT input TE PPM Timeout connection problem betwee2. the wires should be connected as follows Note These can be simply spliced into the cable which connects the EzOSD to the current sensor Red 5v Black Gnd Yellow i2c SCL White i2c SDA Note that when using the direct link between the EzOSD and the EZUHF the RSSI calibration in the EzOSD is not required This calibration feature applies only to the connection of an analog RSSI signal to the EzOSD Antenna Selection In the FPV hobby today far too little attention is paid to antennas A good choice of Tx and Rx antennas for the video link can make a huge difference in range For the uplink side using a UHF link this is also critical Retailers and distributors of the EZUHF system are asked to carry a selection of suitable antennas which may be used for various types of model and flight style The following commonly available antennas have been use successfully by the ImmersionRC design and test teams during many months of testing Diamond SRH771 This is a higher gain whip semi flexible which has been shown to give excellent This antenna is easy to find on E Bay and costs around 20 It is most suitable at the Tx end on the ground but when placed on a model also vertically it has been shown to provide an extremely solid long range link Note that this antenna does have some gain and therefore has flattened doughnut radiation pattern If the antenna used on the Tx side is pointed directly at the model the
3. 3s Lipo power source this is the preferred method of powering the transmitter 2 Power supplied via the DC power jack In cases where the R C transmitter either doesn t provide power via its trainer connector or when a lower voltage is available 2s radios for example it is preferred to power the EzUHF via the DC power jack The power jack is center pin positive 2mm internal pin 5 5mm outer diameter A suitable plug is Mouser 502 S760BK NOTE The EZUHF transmitter may safely be powered via both connectors simultaneously even if two different voltages are presented ImmersionRC EZUHF R C Control System ao As an example Take the case of a R C transmitter which uses a 2s LiPo pack The EZUHF will emit slightly less power than specified approx 25dBm on 8v vs around 29dBm on 11 1v when powered this way In most cases this power difference is insignificant for buzzing around the local flying field this is a very reasonable power level If full power is desired in this case a 3s LiPo pack or equivalent can safely be connected to the DC Power jack providing both higher power and redundancy no power will be consumed from the R C transmitter s battery until the external pack is either drained or removed Binding Each EZUHF Transmitter and receiver must be bound together before they may be used as is the case with just about all of the 2 4GHz systems on the market today The binding process teaches the receive
4. be disabled Multiplex only has one pin for PPM input and output unlike Futaba who have a dedicated pin for each In the first published version of the UHF firmware very short PPM frames such as those produced by the Multiplex radios in 6 or 7 channel modes are not supported 9 channel PPM is the preferred mode for EZUHF compatibility ImmersionRC EZUHF R C Control System oo Cabling the TrackR2 to the EZUHF Transmitter To cable the TrackR2 to the EZUHF transmitter a 4 pin Mini DIN to 4 pin Mini DIN cable is required This cable will be available late November 2010 from ImmersionRC resellers A standard S Video cable cannot be used due to the necessity to cross over the PPM In out connections Note that both connectors are viewed from the back of the male connector where the solder connections are to be made TrackR Trainer dtracker Connector PPM EZUHF gt R2 PPM R2 gt EzUHF NOTE The second PPM line is not actually required but connecting it ensures that the cable can be connected either way around Another NOTE A standard S Video cable cannot be used to connect the TrackR 2 to the EzUHF Transmitter without swapping the two PPM lines Note that the switch on the TrackR2 must be in the Normal position and not Low End when connecting it to the EZUHF ImmersionRC EZUHF R C Control System w EZUHF Receivers The EZUHF receiver should be treated much like its 35 40 72MHz cousins I
5. on the receiver ensures that the receiver can never enter binding mode accidentally during flight if its button is accidentally pressed ImmersionRC EZUHF R C Control System Ss See the advanced section on how to bind multiple transmitters to a single receiver Failsafe If for any reason the UHF link is broken the receiver will wait for approximately 1 second for the link to be restored and then will enter failsafe mode The failsafe servo positions are programmed using the button on the transmitter To set this up two phases are recommended 1 With the plane on the ground and servo positions neutral throttle cut hold down the transmitter s bind failsafe button until the transmitter beeps This will set a reasonable default failsafe ready for the first flight 2 With the plane in flight set the controls in a suitable position for the failsafe and re program the failsafe In most cases suitable position means throttle cut and a gentle turn radius to let the plane circle gently until it lands but of course every application is a little different Power Level control The toggle switch on the top of the EZUHF Tx is used to switch between high and low power modes Even if full feedback of uplink status is available on the EZOSD display it is highly recommended to fly in low power mode most of the time switching to high power mode if required The difference in power levels between the two modes is approximately
6. 6dB which corresponds to a factor of 2 in range ensuring plenty of margin Range Testing Before any flight it is highly recommended to perform a range test on the ground For this use at minimum the low power mode or more ideally attenuate the transmitter output using an SMA attenuator for the range test NOTE Do not forget to remove the attenuators before the flight A 20dB SMA attenuator easily sourced on Ebay is a good choice for this The transmitter does include a range test feature which drops power to approx 13dBm 20mW To access this mode switch from High to Low power mode with the bind pushbutton pressed WARNING Do not forget to cycle Tx power before flying to leave range testing mode ImmersionRC EZUHF R C Control System C Transmitter Compatibility The PPM input circuit of the EZUHF Tx is designed to support a large range of transmitters with PPM input voltages ranging from 3 3v all the way to 9 6v or more Most of the in flight testing was performed using Futaba systems which is used by the system s designers This is therefore the preferred radio for use with the EZUHF link Support for other radios will be added as further testing is done The EZUHF uses standard 4 pin Mini DIN connectors for the R C transmitter link PPM In and the link to the Headtracker see below Cabling the TrackR2 to the EZUHF Transmitter These connectors are the same as those used on the TrackR2 headtracker with t
7. EZUHF R C Control System Overview amp Operating Instructions Nov 2010 for Firmware v1 18 mL ALE ALE Vr em lhi fi bee Renae Vin TUALTITY Table of Contents OT ces coches a ctnkcvsanenncn cama estes EA AtA Aea EAA eee cect teaa tranta t rantre taaten tea eeaa tran raseeaa trees teat S Fe ARIS 7 Pec IUOS ae a E EE sen cose satanatsesaeaceeaine 3 OCU r ten vunsnstiden vn cavnsuilec vsunnterunnsutearaenoncnsnaupectarutueneusibeciadsnsecieiectoneeetnene ess 4 FCI LICONA AE EE EA EE 4 BZA ANN SMO ee ate A EE AN 4 PVE TV CNS SNS N es ensses Setsactetc 5c posi Soe etc te sms a eee te oe vee bre aes ssc is oscars eect been Seeesnee sour aeuvseeeet 4 BERGEN seoses aapoauaemmassnesearcaciants E E E E E 5 FANS ALC wad E AEE A E A E A E A A A AA A E E A 6 POW EN EvE CON OLE E E EE E E E EEEE 6 Ranee PSS UNG sesers E EE cuarsiuantdetonsarsaneunsaecopennrsebieastatmacctes 6 Transmitter Compati Dili Y ericeira TET T TT 7 SVOU PO O e 7 PPM Input amp Head Tracker input pin out ssssessesereesesreressrersrrressrrerssrrerssreressrerssreresererssrereserersseerese 7 F tapa sguare to ZT Ca Ci nrerin E E E 8 Multiplex DIN to EZUHF Mini DIN Cables cccccccccssssecccceeessecceeeeeeeceeseeeeecceeeeeesceseseeeseceessaggaeeess 9 Cabling the TrackR2 to the EZUHF Transmitter cccccccsssecccessececceseccceeesececeuececeenecesseeeceeteusecetseneess 10 ZU ROC OI ON Saracen sete cect E S N E 11 EZUHF Receiver 8 Channel Version C
8. ONNECTIONS cccccccscccscccecceeceesceeceeceeceeecseecsecseueseceeueeeuseeuees 12 Powering the Rx when using high powered SELVOS ssseccccssececeesececceescceceusececsueceeeuueceeseuecesseneess 12 Receiver antenna CONFIQULATION ccseccccesscccccesececcescceceusececseeceeseeseceseueceseunceeeeeecessusecessuneceesanaeeetas 13 Driver Software Installation ON a PC eessesssssssssssssssssrsrsessrresrrrssrrresrereesrtresttrrssttresttreesttreeterresetresrereeserrent 13 PUR 7 WI se siscrca sere carcerntc ge om coyote ts eae seicesee aaene vs ceyadoene oe cue nee acansacinmcaueanncc sere eaearseneucnetes 13 PFS Te SVC CMO teers an E T E E ry E bose eann nie AE E 15 VAI ONG RAS E E E E 15 Active Robots 4 33MH Strale Mt eessen EA 16 Active Robots 46S 51 a 4a od eee eee er re nee ee en oe eee 16 Antenna extension CablOS cccccsssssssecccccccccessecccccccssueeseeecccesssueusseeeeceessseuesseeeceeesssauussceeseessssugageeeeseess 16 IMPORTANT Known Sources of Interference esssssssseneesssssssrrresssssserrrrsesssssrrrresssssserereeessssereresessseeene 18 Appendix A Binding multiple transmitters to a single receiver essssssseesssrrrserreresrrrserrrresrresesreresrrersseerese 19 Appendix B DiIagNOStiC S sursorsne E e 20 ImmersionRC EZUHF R C Control System a Overview The EZUHF R C control system is a reliable R C control uplink for FPV and UAV pilots who desire a robust control system for safe contr
9. ching power supplies especially 5v gt 12v step ups should be the first thing to look at To assist in debugging RF interference problems the ImmersionRC tools v1 12 or greater along with a version of the EZUHF Rx firmware v1 14 or greater can replace a spectrum analyzer worth thousands of dollars The plot below shows a GoPro HD camera radiating around 432MHz the EZUHF in its standard configuration occupies the 433 gt 435MHz band so the GoPro in this case doesn t affect range much ImmersionRC Update Config Tools v1 2 J gt B Select Device Configure Program Spectrum Analyzer ees Note requires EzUHF Firmware v1 06 or later T EZUHF band only V Record Peaks Spectral Analysis RSSI dBm 432 433 434 435 436 437 438 439 440 Frequency MHz 433MHz ae 435MHz Avg Value 100 8221 dBm Stat Scan Stop Scan COM Port EzUHF 8 ch Lite Rx immersionRC USB to UART COM5 ImmersionRC EZUHF R C Control System w Appendix A Binding multiple transmitters to a single receiver This mode is useful in a couple of scenarios 1 When redundancy is required for safety reasons One transmitter may be switched off and another on to recover the model 2 To increase security during long range flights or when a plane once leaving line of sight for a first pilot is passed to a second This appendix will be completed once the feature is fully supported in the firmware
10. d brushed aluminum enclosure e Dimensions 85 x 74 x 23mm 118g e Power Requirements 9 12v DC 250 mA 12v in 600mW mode 85mA 12v in 200mW mode ImmersionRC EZUHF R C Control System Go Security The ImmersionRC team does not promote reckless long range flight where property and or lives are put at risk This R C control system was brought to the market for use by responsible end users who are aware of and comply with local legislation regarding FPV UAV flight ImmersionRC accepts no responsibility for property damage parts damage model damage or personal injury due to the misuse of the EZUHF or any other ImmersionRC product Radio Licensing The EZUHF R C control system transmits on radio frequencies which may require a license for use The specific band of frequencies is firmware dependent and in some cases may be tailored to meet a retailer distributor s requirements The default band used is 433 435MHz which falls in the 70cm Amateur Radio band Because of this this product requires an Amateur radio or similar license to use in most parts of the A Please check your local legislation before using this product A EZUHF Transmitter Powering the transmitter The EzUHF transmitter has two flexible power options Both of which may be used for additional world redundancy 1 Power supplied via the 4 pin mini din connector In the case where the transmitter is connected to a futaba radio with 9 6v or
11. eparate the A V Tx from the UHF Rx and UHF antenna Two configurations have been shown to work very well during hundreds of hours of flight testing 1 A V Tx out on a wingtip with the EZUHF Rx antenna on the opposite wingtip 2 A V Tx out on a wingtip with the EZUHF Rx in the nose and EZUHF antenna just in front of the vertical tail fin ImmersionRC EZUHF R C Control System a IMPORTANT Known Sources of Interference There are several cameras which have been shown to emit broadband noise which can greatly limit the range of any UHF R C system FHSS or not The use of these cameras should be avoided on any plane controlled by a UHF link This list will be extended as more cameras are tested KT amp C VSN505 a k a KX550 Emits broadband noise in the 310MHz to 610MHz band Ground test range reduced to 30 of range without it Up to date information on other cameras can also be found by googling the name of the camera along with the keyword UHP Note that the popular GoPro cameras do have a relatively powerful noise emission at around 432MHz These don t seem to affect the EZUHF much in practice but it is a good idea to separate the GoPro from the UHF Rx Antenna as much as possible As a rule of thumb if the RSSIs for an EZUHF system look good 60 80dBm range and the link quality indicator is often dipping below 100 suspect an interfering source on the plane Cameras SD and HD and poorly designed swit
12. ere http www immersionrc com EZUHF htm EZUHF gt EzOSD link Linking the EZUHF receiver to the EZOSD can create a very powerful combination The EZUHF receiver 8 channel version will periodically inform the EzOSD of the following measurements 1 The RSSI received signal strength on each of the two antennas 2 The overall signal quality which includes packet loss information 3 Frequency error measurement difference between Tx and Rx frequencies 4 Error rates per frequency bin These measurements are in turn downlinked via the telemetry stream and may be shown on the antenna tracker LCD display displayed in the ImmersionPlayer or shown live using the iPad iPhone iTelemetryFPV application The on screen data provides direct feedback to the pilot of any problems with the uplink in real time The recorded telemetry stream may be used to diagnose problems after a flight and can be a powerful tool for comparing antenna performance antenna position etc The connector used for this link is the Molex connector named OSD Link shown below ImmersionRC EZUHF R C Control System e For DIY cables the following Farnell parts may be used 5 POS Molex PicoBlade Housing 615109 Flying lead 300mm 1125274 The EZUHF Rx end of the cable uses a 5 pin Molex connector as used for the GPS connection to the EzOSD PCB the OSD end not the GPS end ImmersionRC EZUHF R C Control System a On the EzOSD end
13. he same pinout These connectors are also the same as those used by the popular S Video standard which makes finding pre molded connectors and cables quite easy The S Video cables have Chroma Gnd and Y Luma Gnd as two twisted pairs these correspond to Pwr Gnd and PPM In N C which won t cause any problems Note that the S Video extension cables Male gt Female may be used as extension cables but cannot be used to connect the TrackR2 to the EZUHF Transmitter see below S Video pin out Y Luma PPM Input amp Head Tracker input pin out PPM Out As viewed looking at the female connector on the UHF Tx ImmersionRC EZUHF R C Control System z To remove any confusion the pin out is marked directly on a photo of the transmitter below A Futaba to EZUHF cable is supplied with the EZUHF The wiring diagram of this cable is shown below for reference PPM TX gt EZUHF ImmersionRC EZUHF R C Control System e Multiplex DIN to EZUHF Mini DIN cable Multiplex radios with the standard DIN connector may be used with the EZUHF A 5 pin 180 degree DIN connector is required even though more recent radios have a few extra pins 5 pin 180 Pin MPX Function EZUHF pin 1 V battery 2 V battery Switched VBatt 3 Ground Gnd 4 Out In PPM In 5 Disable HF NOTES Bridge pins 3 5 to disable the HF module in all MPX radios Do not enable the trainer port as input or the output will
14. hidden under the padded label it is located between the two stacked PCBs and needs to be pressed using a non conductive stylus or similar Powering the Rx when using high powered servos It is very important to take care with powering the Rx especially when high torque digital servos are used If a BEC is used ensure that it can deliver the current required by the servos Digital servos can create huge current pulses on the power line and if the impedance of the supply is too high these will cause the receiver to malfunction The use of a high performance BEC such as the Turnigy 5 7 5A UBEC HobbyKing is recommended instead of the BEC built into the ESC Alternatively for installations on larger planes with many servos a PowerBox should be considered ImmersionRC EZUHF R C Control System Ea Receiver antenna configuration The 8 channel diversity receiver has as its name might suggest two antenna inputs The receiver does expect antennas to be connected to both of these antenna connectors unless configured otherwise It is not advisable to leave the receiver configured in diversity mode and connect just one antenna The ImmersionRCTools application available from the ImmersionRC website can be used to configure the receiver antenna configuration for cases where only a single antenna is used Driver Software Installation on a PC The Windows software to support the EZUHF may be downloaded from the EZUHF website h
15. n R C Tx and EzUHF Common problems are _ which indicates that the R C Tx is in PCM mode instead of PPM The EZUHF and all other equivalent systems require PPM as input and not PCM Anoter common problem is _ which indicates that a PPM signal was not sensed generally indicating that the R C Tx is connected to the wrong connector ImmersionRC EZUHF R C Control System w Problem RSSI values are good but the link quality indicator is often below 100 This is in almost all cases an interfering RF source located on the plane Look for cameras which radiate unintentionally in the UHF band or noisy switching regulators especially those used to switch up from 5v to 12v to run a 12v camera ImmersionRC EZUHF R C Control System a
16. ol at longer distances It was designed with the FPV UAV pilot in mind the only such system with a dedicated head tracker port ensuring compatibility with a wide range of radios An Aux Ctrl port is available to connect to a control board for in flight UAV configuration without sacrificing valuable control channels Features Specifications e Reliable FHSS Link Frequency Hopping Spread Spectrum e 4383MHz 70cm Ham band operation e Options for 431 4383MHz 433 435MHz 435 437MHz e Spectrally clean GFSK modulation e 600mW 28dBm output power with 200mW low power mode e Direct head tracker input adding head tracker compatibility to most radios e Power switch boost power when at long range optionally drive from unused control on the R C Tx e Standard SMA antenna connector compatibility with 4833MHz 70cm Ham band antennas e Flexible buffered AC coupled PPM input ensures compatibility with 3 3v thru 9 6v PPM levels e Standard USB port Mini A for firmware upgrades and system configuration e Single pushbutton learning of failsafe positions e Binding function which allows binding Single Tx gt Rx Multi Tx gt Rx and Single Tx gt Multi Rx e Mates with 8 channel and 4 channel EZUHF receivers e Spectrum analyzer built into EZUHF receivers to aid in debugging RF interference e Power sourced directly from the R C Tx Futaba or optional DC power jack e Built in receiver for future expansion e Custom extrude
17. r several pieces of information 1 The transmitter s unique ID and therefore its pseudo random hopping sequence 2 The precise frequency difference between the transmitter and receiver caused by crystal tolerance 3 The precise frame rate emitted by the R C Tx Note that point 3 does mean that rebinding is required if the EZUHF transmitter is switched between different R C transmitters especially those with different frame rates For more advanced binding see Appendix A Binding multiple transmitters to a single receiver The binding procedure is as follows 1 Connect suitable antennas to both the EZUHF Tx and Rx and place them within 1m of each other 2 Connect the EZUHF Tx to the R C Transmitter switch to low power mode hold down the pushbutton and turn on the radio 3 Assoonas a periodic beeping starts let go of the button 4 Apply power to the receiver and within 10 seconds hold down the binding button on the receiver After lt 1 second the LED should extinguish and shortly after it should flash 3 times indicating binding success If instead the LED flashes 6 or 10 times quite quickly then binding failed and must be re attempted NOTE The Bind switch on the 8 channel dual board receiver is accessed between the two boards from the hole beside the servo connectors it is not hidden under the BIND text on the label 5 Power down the Tx and Rx Binding is complete NOTE The 10 second limit
18. re will be a ImmersionRC EZUHF R C Control System ao o significant amount of attenuation something that should be very familiar to users of standard R C radios Turn 90 degrees to the model to avoid this The antenna manufacturer Nagoya also sells a version of this possibly made in the same factory called the NA 771 This is generally a bit cheaper and appears to perform as well Active Robots 433MHz Straight http www active robots co uk 433mhz antenna straight p 544 html Model ANT 433MS This antenna works well when antennas are placed remotely from the receiver using extension cables see below terminated in bulkhead SMA connectors These connectors can be embedded in a wing or fuselage pointing straight up or down d Active Robots 433MHz R A http www active robots co uk 4383mhz antenna rightangled p 545 html Model ANT 433MR Two of these antennas angled at approx 45 degrees from each other connected directly to the two 8 channel Rx antenna inputs work very nicely and protect against huge losses due to cross polarization ee Antenna extension cables Since the EZUHF uses standard SMA connectors for all antenna connections it is very easy to find or construct extension cables ImmersionRC EZUHF R C Control System 16 Even though the ImmersionRC receivers contain ceramic filters on the input stages which attenuate higher frequency RF emissions it is highly recommended to s
19. t requires 4 8 gt 6v power to be applied through one of the servo connections generally supplied from the ESC or BEC in most models used for FPV The two receivers currently shipping include 1 8channel bi directional with Antenna Diversity This is our high end receiver which has the hardware support for a bi directional link NOTE Firmware support for this will be added during the Summer of 2010 A diversity switch ensures that antenna input with the highest signal strength is used at all times The OSD Link allows link quality metrics to be queried by the EzOSD 2 4channel uni directional with single antenna connector This is a featherweight receiver ideal for smaller models who only require a maximum of 4 servo outputs and don t need the antenna diversity OSDLink Bi directional features of the 8 channel version Note that the range of this receiver is as good as or even slightly better than the 8 channel version don t let its size fool you Note that both of these receivers include a 7 pole ceramic filter on all antenna inputs providing a good degree of immunity from nearby A V transmitter sources Even with this it is highly recommended to separate the A V Tx and UHF Rx antennas physically as much as possible ImmersionRC EZUHF R C Control System poe EZUHF Receiver 8 channel version Connections Servo connectors on the 8 channel receiver have the pin out shown below Note that the binding button is not
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