HW USER MANUAL
Contents
1. EPION 2 Mechanical Mounting HW USER MANUAL Rel 1 3 The proper use of the pallet requires itself monitoring on a suitable heatsink which is able to dispose of a power of approximately e 400 W for LC ASS 009 1 kW 144 MHz e 350 W for LC ASS 011 500 W 432 MHz e 250 W for LC ASS 012 250 W 1290 MHz Pallet preparation remove any oxide from the pallet surface close to the heatsink using a fine abrasive paste then degrease the surface To minimize the thermal resistance pallet heatsink lay down a layer of conductive paste Heatsink mounting use n 7 screws TC M3x12 mm with its flat washer uy 230 4 0 1 i L a L 56 0 Lem Epi Ly cr Tt fl iO i 0 l I pi Fi Ventilation to facilitate the power dissipation is recommended to ensure an even air flow on top of the pallet Indicatively here is attached a photo of the test heatsink www lepcon it 3 Exclusive HAM market www i0jxx com R EPION HW USER MANUAL Rel 1 3 3 Electrical Connections The amplifier requires some fundamental connections such as e Power supply V and GND e Input signal RF_In e Output signal RF Out Interface Connector Pinout setenas A UART_RX j AM woo aiipata a i f i net Input Match x i 3 Network i E pe S RF ma n i i Out Interface Conn Bias Controller Pars es ei INHIBIT 2 4 8 10 12 14 GND 1 E V Power Cord Status Leds In2. EP ON sea RF Pallet LC ASS 009 011 012 HW USER MANUAL Rel 1 3 RUMI CTIPUION ccscccscccccssesccesessccsessccsccsccesesees 2 MMM Al MOUNLING ssccsecsccssesccesessccsessscscesccees 3 3 Electrical Connection s cccccccccccccccscccccscccccsccscceces 4 4 Interface Connector DeSCriptiOn cssccossscceeees 5 EE E EENE AE 7 6 Operating Models and States ssseesssecsssessseessseeso 8 IIIS EENAA AA 9 o MOR 10 www lepcon it l Exclusive HAM market www i0jxx com HW USER MANUAL Rel 1 3 1 General Description This manual illustrates the uses of the modules e LC ASS 009 1 kW 144 MHz e LC ASS 011 500 W 432 MHz e LC ASS 012 250 W 1290 MHz which share the same physical layout and the same control and protection system that is based on LepCon module e LC ASS 010 Dual Channel Bias Controller Bias Controller performs two macro functions e t oversees the functioning of the amplifier in different operating methods monitoring constantly the most important working parameters and eventually implementing security strategies e It allows the interview with an host in order to o configure not in an ephemeral way different operating methods o real time monitor the main working parameters and alarm conditions The initial configuration of the amplifier has been chosen so that the user can avoid using the serial connection with PC www lepcon it 2 Exclusive HAM market www i0jxx com
3. thermally stabilized on a working point in order to allow the RF signal amplification 7 Alarms If when the amplifier is on it overheats or rather the temperature rises more than 80 C it is driven by an excessive input signal it absorbs an excessive stream it is Supplied through an irregular voltage Coo it comes to the state ALARM When it comes into this state 1 in all cases the gate polarization is removed from LDMOS 2 in cases a c ed the LDMOS supply is removed too Note that the action 1 in case of b makes the amplifier remain operating but with a considerable input desensitization This ensure that in case of excessive handling an automatic reduction of the overall signal AC DC on LDMOS gates will be realized This protection intervenes within 1mS when the input signal exceeds the warning threshold set in the Fw Note protection for excessive handling allows you to implement a partial protection of the input of LDMOS This protection although partial is beneficial to the transients of electrical mains absorption which occur for instance in a use of CW type when the input signal starts to work This happens because as the driving LDMOS driving starts it works always in a smooth way To reactivate the amplifier from the ALARM State it requires a RESTART e fit was in alarm state because of excessive temperature then returning to the same operating state or not depends on the configuration If in the c
4. able is fundamental to understand the status of the amplifier especially when it is used without the conjunction with the monitoring SW For the correct interpretation you should take into account that for each STATE each row indicates a timeline of 100mS and it has to be considered cyclically For example the TC state the table represents an alternate blinking of both yellow and green leds www lepcon it 7 Exclusive HAM market www i0jxx com EPION 6 Operating Models and States HW USER MANUAL Rel 1 3 The entire amplifier is ruled by a machine of finite states that every 128 uS elaborates a working condition This evolution speed has been chosen in order to respond in time to the most critical events that can happen as the alarm conditions A very simplified description of the automaton is shown in the following figure RESET Alarm condition RESTART When switched on it runs an initial self test which lasts about 20S and that evaluates if the hardware is working correctly running a series of checks e evaluation of the correct configuration parameters in EEPROM memory e evaluation of voltages 3 3 V and 5 0 V of the Bias Control module within 5 of the nominal value e evaluation of the correct value of the supply voltage within 5 of the nominal value e evaluation of the temperature sensor integrity e evaluation of the integrity of the active RF LDMOS element within 20 of the nominal val
5. addition for advanced features you need the connections that are available on the Interface Connector of 14 pin whose description is shown in the table Among the available features there are Input output UART_RX TX at level RS 232 for asynchronous serial connection input TTL of enabling to transmission PTT Push to talk input TTL of INHIBIT for amplifiers On Off and alarms reset analog output of V_NTC temperature sensor output TTL of ALARM to indicate the alarms in out lZC_SDA SCL at TTL level for synchronous serial connection 12C o SPI Bay way of an example UJ ao ee ee ed et ee ee ee en YAA H 3 NEE a Er www lepcon it 4 Exclusive HAM market www i0jxx com EPION 4 Interface Connector Description HW USER MANUAL Rel 1 3 UART_TX RX signal pair to RS 232 level related to GND that constitute the asynchronous serial interface to a host typically a PC Trough the cable with DB9 M connector as shown in the diagram alongside you can connect directly to an interface DTE standard DB9 F Connection parameters are 9600 N 8 1 INHIBIT signal to TTL level with internal pull up that allows to switch off the RF part of the amplifier stopping the LDMOS alimentation The signal is active low SO e when INHIBIT is in GND the amplifier is at rest e when INHIBIT is at 5V or when it is left open the amplifier is powered This feature can be enabled or disabled through SW configuration even if it s disable
6. d the amplifier is powered INHIBIT input has also a second feature which is independent by enabling the transition from GND to 5V entails the RESTART of the amplifier see below putting it out from the alarm condition In order to use this feature you can connect this input to a button usually to GND PTT signal of TTL level with internal pull up that leds the amplifier to a low power state It can be used in a transmitter receiver system in order to avoid that when it is in RX power isn t dissipated at rest Consider that with bias stream of 2A and supply of 48V you will get a dissipated power of 1000W The signal is active low so e when PTT isin GND the amplifier in on e when PTT is at 5V or when it is left open the amplifier is at rest This feature can be enabled or disabled through SW configuration even if it s disabled the amplifier is powered Note when inputs INHIBIT and PTT are activated at the same time INHIBIT function takes priority on PTT www lepcon it 5 Exclusive HAM market www i0jxx com EPION HW USER MANUAL Rel 1 3 V_NTC analog signal variable in the range 0 5V linked to the temperature of the amplifier module It is obtained from a sensor NTC PANASONIC ERTJ1VT222H type which has a resistance temperature governed by the Steinhart Hart curve of the first order E HTE i i R T R To exp B 1 T 1 To where To 298 16K 25 C R To 22000hm B 4450K The NTC is i
7. nternally powered at 5V through a 3 3 kOhm resistor and voltage is put out through an analog buffer From the voltage value through an appropriate processing it is possible to trace the value of resistance R T of the NTC R T V_NTC 3300 5 V_NTC And from this value it is possible to trace the temperature in Kelvin through the Steinhart Hart inverse function 1 T 1 To 1 B In R T R To With this sensor Bias Controller follows the compensation functions and thermal protection A possible use of this output may be to drive an analog comparator that enables a forced ventilation at a certain temperature value ALARM signal of TTL level that gets active when one of the possible alarm conditions is underway I2C_SDA SCL reserved for future use or upon request www lepcon it 6 Exclusive HAM market Wwww i0jxx com EP ON 5 Leds HW USER MANUAL Rel 1 3 The Bias Control module is provided with three leds in red green and yellow that with various ignition systems and modulations indicate the various machine conditions As a general rule the red apart from the case of Self Test is used to indicate an alarm condition in this case the other two leds code the alarm cause When Red led is off yellow and green leds indicate the operating States of the machine Some of the states shown in the table are not of interest to the user Led Yel Led Red SELF_TEST_Tc SELF_TEST FAL L____ The use of this t
8. onfiguration memory you have enabled automatic restart then it leaves the alarm when the temperature drops below 70 c Alternately if the auto restart is not enabled the manual restart is required see below e lf it was in alarm state because of excessive monitoring then returning to the same operating state or not depends on the configuration If in the configuration memory you have enabled automatic restart then it leaves the alarm when the input signal is reduced Alternately if the auto restart is not enabled the manual restart is required see below e lf it was in alarm state because of excessive power consumption or because of supply voltage outside limits equal to 5 V 10 of the nominal value then the return to the same operating state is possible only through manual restart see below www lepcon it 9 Exclusive HAM market www i0jxx com EP ON Manual restart can be performed in one of the following three ways HW USER MANUAL Rel 1 3 1 by switching off and on the amplifier 2 by performing a transition GND 5V of the input Inhibit 3 by sending an appropriate serial control see handbook SW 8 Factory Configuration see the list of the possible operating options that you can select through SW e Enable Self Start after the Self Test it makes the machine go into STOP or TEMP _COMP If it is not enabled the machine passes the self test and goes in STOP From this state it can go in TEMP_COMP only by
9. the serial port control btc It should be always on e Enable Inhibit it enables the hardware control Inhibit e Enable PTT it enables the hardware control PTT Push To Talk e Enable Pw In Alr it enables the alarm for excessive monitoring e Self Res Pw In Alr it indicates if after an alarm for excessive monitoring the machine is gone out automatically the input signal is reduced e Self Res Temp Alr it indicates if the machine is automatically out from an alarm due to the excessive temperature when it decreases The factory amplifier configuration provides Enable Self Start on Enable Inhibit on Enable PTT on Enable Pw In Alr on Self Res Pw In Alr on Self Res Temp Alr on For a preliminary test of the amplifier it is required e PTT connected to GND INHIBIT left open Warranty the warranty is valid for one year from date of purchase This warranty does NOT cover any breakage of the Mosfet This warranty does NOT cover any improper use of the module and the non observance of the instructions above Shipping costs are charged to the customer www lepcon it 10 Exclusive HAM market www i0jxx com
10. ue e evaluation of the integrity of the selecting switch to supply LDMOS If one sequence test fails further tests are not carried on and the machine stops immediately in a State of SELF_TEST_ FAIL The fact that the self does not succeed is due to two different types of causes 1 self test conditions are not met 2 there is a hardware breakage Possible causes of 1 are a wrong supply voltage b temperature out of operating bounds c presence of incoming RF signal To clarify the reason for point c remember that during the self test of the LDMOS the active device in thermal compensation is brought to the rated current of 1A and it is verified that each of the two active elements involves the expected absorption within the tolerances of the measuring system Since the presence of input RF signal can alter the amount of absorption it is impossible for the test to run www lepcon it 8 Exclusive HAM market www i0jxx com EPION HW USER MANUAL Rel 1 3 If the self test succeeds rather everything works correctly depending on the configuration the machine can run e in TEMP COMP where bias is steady at the reference value set in the configuration memory e in WAIT PTT where the active device is kept off In this State there is no power absorption From this state you can still move to the TEMP COMP state by activating the PTT on the input interface connector The TEMP_COMP is the operating state in which LDMOS works and it is
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