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HM135 

Service Manual 

Preliminary version 

Page 4 of 13

 

 

2 CIRCUIT 

DESCRIPTION 

2.1 General 

information 

The HM135 is basically divided into 2 printed circuit boards: 

Main board

 and 

Head

. Circuitry and signals can be 

divided in the following sections: 

 

Microprocessor/control 

 

Front panel (head) circuitry 

 

VCO / Synthesizer (PLL) 

 

Transmitter 

 

Receiver 

 

Errore. L'origine riferimento non è stata trovata.

 

 

ON/OFF switch, rear connector and internal connectors 

Refer to the Block Diagram and the Schematics. 

2.2 Microprocessor/control 

The microprocessor 

DD5

 is constantly operating when the radio is turned ON. It is continuously monitoring the 

keyboard, the PTT line and other internal inputs such as the squelch detect, etc. When a change occurs, the 
microprocessor makes the appropriate response according to its program in order to control the all radio 
functions. On channel change, the Radio emits a beep and the synthesizer is loaded with the correct frequency 
information. The microprocessor runs off a 8 MHz oscillator which is composed of 

X3

C353

C354

 and 

R319

When the radio is first turned on, the microprocessor reads the radio status from the EEPROM 

DD3

 which 

contains all the radio’s parameters. 

The microprocessor determinates the receive frequency codes, then loads the synthesizer via its pins 

42

 (line 

PLL_LE

), 

43

 (line 

PLL_DATA

) and 

46

 (line 

PPL_CLK

). 

Pin 

40

 outputs a PWM signal which is converted by 

DA18:B

 into a CC voltage at its output (line 

RF_PWR_CTRL

which controls the RF output power. 

Pins 

37

 and pin 

39

 outputs a PWM signal which are used, respectively, to generate the Selcall signal (line 

MCU_SELCALL_PWM

) and CTCSS/DCS signal (line 

MCU_CTCSS_DCS_PWM

) as further explained. The 

digital signals coming from the ADC converters which drive the microprocessor in order to decode the Selcall and 
CXTCSS/DCS signals are applied, respectively, to pin 

59

 (line 

ADC_HI_SPEED_DATA_RX

) and pin 

60

 

(

ADC_lo_SPEED_DATA_RX

). 

The firmware program interface is made by means of the connector 

XP3

 

The microprocessor is fitted with an internal program flash memory as well, therefore functions can be 
customized, if necessary, upon specific request from the customer. 

2.2.a PTT 

circuit 

The PTT switching is totally controlled by the two microprocessors (

DD5

 in the main board and 

DD800

 in the front 

board in the front panel): when the PTT is pressed, the line 

AUX_PTT

 goes low, so the transistor 

VT806

 changes 

the status of the pin 

20

 of microprocessor 

DD800

 which is “informed” that the radio is in TX mode (i.e. PTT is 

pressed), so it changes its output at pin 

22

 putting the low level at pin 

8

 of the connector 

XT802

 which is 

connected to the main PCB with the connector 

XT2

. This means that pin 

8

 of 

XT2

 (line 

HANDSET_PTT_TO_MPU

) goes low. This line is connected to the 

VT56

 which changes the status of pin 

26

 of 

the microprocessor 

DD5

 from hi to low. Now the microprocessor 

DD5

 is also “informed” that the radio is in TX 

mode, so it can control the +8V voltage which is alternatively fed to the TX or RX stages according to the radio’s 
status. Pins 

29

 (line 

TX_FROM_MCU

) and 

30

 (line 

RX_FROM_MCU

) control the +8V power switches which 

alternatively outputs this voltage to the RX section (line 

+8V_RX

) with 

VT42

 or to the TX one (line 

+8V_TX

) with 

VT41

The transistor 

VT805

 is controlled by the pin 

19

 of the microprocessor 

DD800

 and it is used to eventually disable 

all the over stated PTT chain according to the radio’s status (e.g. busy lock out, timeout timer etc). 

Содержание HM135

Страница 1: ...HM135 Service Manual Preliminary version Page 1 of 13 ALAN HM135 Mobile VHF Transceiver Service Manual Copyright 2004 by CTE International Italy all rights reserved...

Страница 2: ...Front End 7 2 6 b Local Oscillator LO 7 2 6 c Mixer 8 2 6 d FM Detector and Squelch 8 2 6 e Audio routing 8 2 6 f CTCSS DCS signal routing 8 2 6 g Selcall signal routing 8 2 7 Signaling 8 2 7 a Gener...

Страница 3: ...epending on the version from 9 KHz to 1 GHz 36 dBm Spurious Emissions W from 1 to 4 GHz 30 dBm Modulation System FM F3E PM G3E Maximum Deviation KHz 2 5 12 5 KHz 5 25 KHz Adjacent Channel Power Attenu...

Страница 4: ...TCSS DCS signal line MCU_CTCSS_DCS_PWM as further explained The digital signals coming from the ADC converters which drive the microprocessor in order to decode the Selcall and CXTCSS DCS signals are...

Страница 5: ...is driven by the modulating signal line A regulated by the trimmer RP4 This is part of the double point modulation and works mainly in high AF modulating frequencies the other part of the double poin...

Страница 6: ...eds the driver amplifier VT23 whose output from the driver stage feeds the final RF power amplifier VT22 to produce the rated output power of 25 watts The output of the power amplifier is applied to t...

Страница 7: ...with the speech Selcall signal DA9 C sums the two signals speech Selcall coming from pin 11 of DA10 and CTCSS DCS coming from pin 12 feeding its combined output to DA9 D which is a 3 KHz low pass fil...

Страница 8: ...switch VT54 controlled by the transistor VT55 2 6 e Audio routing The detector s audio output line DETECTOR_AUDIO is fed to DA13 A and DA13 B 3 KHz low pass filter deeply described in the next paragra...

Страница 9: ...ector as explained in par Selcall signal routing 2 8 ON OFF switch rear connector and internal connectors 2 8 a ON OFF switch The line ON OFF_SWITCH is normally pulled up by the resistor R182 When the...

Страница 10: ...f RP6 and Ground Turn RP6 in CCW direction until readings of the ohmmeter are within 100 to 300 Ohm 4 Connect an ohmmeter between the wiper of RP7 and Ground Turn RP7 in CCW direction until readings o...

Страница 11: ...n LCD It is OK Switch OFF the Radio 3 5 Programming the radio 1 Connect the programming cable to radio s Microphone Connector 2 Press the F1 key keep it pressed and switch ON the radio Radio will resp...

Страница 12: ...een 9 and 10 W 3 9 Setting of modulation 1 VERY IMPORTANT Switch off all the modulator filters in the deviation meter communication tester before this measurement Radio s modulation input used for thi...

Страница 13: ...radio s antenna connector 4 Set the RF generator modulation frequency to 1kHz and the deviation to 3 KHz Set the RF output of the generator to 87 dBm 10 uV 5 Decrease the level of RF generator until...

Страница 14: ...ALAN HM 135 TEST POINTS AND PCB LAYOUTS...

Страница 15: ...p d f M a c h i n e b y B r o a d G u n S o f t w a r e TP1 Freq Adj Ref Mod Adj VCO Mod Adj TX VCO Adj RX VCO Adj Driver Bias TX PA Bias TX Pwr Cal Squelch level TEST POINTS...

Страница 16: ...p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 17: ...p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 18: ...p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 19: ...p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 20: ...p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 21: ...p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 22: ...p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 23: ...p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 24: ...p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 25: ...p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 26: ...ALAN HM 135 ELECTRICAL DIAGRAMS...

Страница 27: ...HM135_HEAD_FEB_14_2004 SCH p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 28: ...12 13 14 D 5 6 7 B 10 8 9 C p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 29: ...5 6 7 B 12 13 14 D 1 2 3 A 1 2 3 A 10 8 9 C p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 30: ...1 2 3 4 8 A 1 2 3 4 8 A 5 6 7 B 10 8 9 C 5 6 7 B 1 2 3 4 8 A 5 6 7 B 1 2 3 A 12 13 14 D 1 2 3 4 8 A p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 31: ...10 8 9 C 5 6 7 B 1 2 3 A 5 6 7 B 12 13 14 D p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 32: ...p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 33: ...1 2 3 4 8 A p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 34: ...5 6 7 B p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 35: ...5 6 7 B 10 8 9 C 1 2 3 A 12 13 14 D p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 36: ...p d f M a c h i n e b y B r o a d G u n S o f t w a r e...

Страница 37: ...ALAN HM 135 EXPLODED VIEW AND PART LIST...

Страница 38: ...ALAN HM 135 PROGRAMMING MANUAL...

Страница 39: ...HM135 HM435 Programmer software guide Preliminary version Page 1 HM135 HM435 VHF UHF Mobile Transceiver Programmer Software Guide Preliminary version issued on February 15th 2004...

Страница 40: ...ht 2004 by CTE International Italy all rights reserved Microsoft MS and Windows are registered trademarks of Microsoft Corporation IBM is a registered trademark of International Business Machines Corp...

Страница 41: ...TX calls Call1 Call2 Emergency Transpond and Auto ID ANI 16 5 5 Monitor Key Behaviour 16 5 6 Manual Autoreset for selective calls 18 5 7 Overviewing a Channel Data Summary 18 6 CUSTOMIZATIONS 20 6 1...

Страница 42: ...onal radio systems radio system and radio network settings parameters as well as general PC operation This programming guide is subject to change without notification This booklet is referred to the c...

Страница 43: ...exe file 5 Click OK and then follow the instructions which appear 6 Several windows will ask you to insert your user s information choose a destination location for the program and finally select the...

Страница 44: ...ou need to remove the RJ connector from the transceiver s microphone socket unlock it by pushing the side release button of the RJ connector and remove it by grasping the connector itself not the cabl...

Страница 45: ...ed as default 3 3 Checking the software version If you want to see the software version and other additional info from the menu Help select About The About window will open showing you the said data 3...

Страница 46: ...you want to create any name will do anyway we recommend to type the customer s name then press the Save button the Channel Data window will open Important we ll always refer this window as Channel Dat...

Страница 47: ...sensitivity area and select either the Local or Distance radio button for that channel depending on your needs For regular applications we recommend to use the maximum sensitivity by keeping the defau...

Страница 48: ...l 1 in the figure will open 3 If you need to activate the CTCSS encoder click on the TX tone Hz drag down button and select the tone encoding frequency you need e g 110 9 Hz 4 If you need to activate...

Страница 49: ...1 Switching between Channel Data and Global Data windows Starting from now we ll need to switch between Channel Data and Global data Windows Global data window can be recalled at any time by clicking...

Страница 50: ...Up 2 area is useful to set up the emergency call For further information please see the paragraphs 6 8 The Tables area allows you to define the parameters for the Selective Calls ref par 6 1 setup RX...

Страница 51: ...the following example we selected the sequence 1 4 If you want to assign an alphanumeric name to the selected Rx sequence just type the new name over the existing one RxSeq x in the example we rename...

Страница 52: ...ttings in case of big mistakes In this case click the button located in the uppermost right corner and start from the beginning of this paragraph If you composed a completely wrong sequence set up you...

Страница 53: ...ght to the next paragraph Close the Tx sequence set up without entering all the settings in case of big mistakes In this case click the button located in the uppermost right corner and start from the...

Страница 54: ...y Just go to the Wait before transpond on BUSY Channel drag down button and select the time you need which is available in 2 5 sec steps 7 Select the condition in which you want the transceiver be sen...

Страница 55: ...software guide Preliminary version Page 17 1 Be sure you are selecting parameters on the right channel if not please select the right one by clicking on either the or button in the Channel num area i...

Страница 56: ...ed by default checkbox click the Autoreset button the Autoreset window will open 4 Select the autoreset time you need by clicking the Autoreset drag down button and then click the needed time You can...

Страница 57: ...will remain on the screen providing an useful programming monitor In fact it can be manually updated every time you press the Update button or automatically after any programming operation you will m...

Страница 58: ...s of the standard Selcals Moreover if you don t want to use the standard Selcal tone frequencies you can totally define your own Selcal standard called PERSONAL 1 From the Global Data window Tables ar...

Страница 59: ...Global Data window Set Up area click the Scan configuration button the Scan configuration window will open 2 In the Scanning conditions area you can define the condition in which the scan should stop...

Страница 60: ...nel accessed if you want to automatically select the last channel used before it was switched off Click the Txed selcal drag down button and select the required selcal to automatically being sent ever...

Страница 61: ...ic signals as follows From the Global Data window Set Up area click the Key Warn beeps button you will toggle it OFF or ON depending on the times you press the button We recommend when possible to lea...

Страница 62: ...Number of burst 1 255 box then type the number of trills alternations of Tone 1 and Tone 2 per burst in the Number of trill per burst box 7 If you have selected more than one burst for each ring you c...

Страница 63: ...set LCD contrast and backlight and the default squelch level Moreover you can enable disable a variety of miscellaneous settings such as the microphone with keypad the optional internal scrambler boar...

Страница 64: ...lso decide to assign selcalls to one or more F key s 1 From the Global Data window Tables area click the Menu manager button the Menu manager window will open 2 To enable a menu or submenu go to the S...

Страница 65: ...message after clicking on Program data button WHICH RADIO Radio type HM35 START_UPLOAD UPLOAD_SYS_RADIO_DATA UPLOAD_RX_SEQ_DEF x These two messages are repeated for each RX channel x is the number of...

Страница 66: ...t be blank gray otherwise close the file with the command File Close radio 2 From the menu Options select Restore System DB A window will open with the message Restore the SYSTEM DB Default Public Dat...

Страница 67: ...required programming data or browse it using the directory tree in folder box programming files use the extension hmv or hmu and are usually placed in the directory C Programs HM135 Programmer usrDB...

Страница 68: ...your computer 5 Package contents 5 System requirements 5 M Manual Autoreset for selective calls 18 Menu F keys customization 26 Monitor Key Behaviour 16 N New or already stored data 7 P Programming mo...

Страница 69: ...ing timing speed priority wait 21 scanning with CTCSS DCS 21 scanning with Selcal 21 special BUSY Tx lockout 23 Squelch level 25 Tx PTT resume timer 23 Tx timeout timer 23 Software installation 5 T Ta...

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