User manual Ascom SE550 Transceiver
Contents
1. Author Andy GOBEQ User manual Ascom SE550 Transceiver This document is intended as a brief getting started guide to the radio Further information circuit diagrams service information etc is available on the following web site http www gObeq fsnet co uk ascom ascom htm and from other references found to the rear of this guide Information within this document has been compiled from several sources in an effort to satisfy the needs of a user in understanding the operation of the radio when fitted with MK3 software It is provided on a best endeavours basis with no guarantee that it is always correct Transceiver Specification The ASCOM SE550 was original used in a trunked radio system and has been modified to work in the 4m 70MHz amateur radio band Frequency Range 70 88 MHz Channel Spacing 5 6 25 10 12 5 15 18 75 20 25 kHz steps Modulation mode FM PM Antenna BNC 500 TX Power Adjustable to 25W max Deviation 2 5kHz DC Power Nominal 13 2V 10 8 15 6V RX approx 1A TX 6 5A 25W Amateur radio Eprom software version MK3 Transceiver Operation Connect power loudspeaker and microphone Connect the microphone to the lower front panel receptacle Ensure that a jumper is fitted to the lower pair of pins in the upper front panel receptacle the rig will not power up without this jumper or that a code plug is fitted in this slot Please note 1 In2. Call Tutor Submenu all a bit vague this Call Tutor On Off Hold TX This is to switch on and off the 5 tone answering Callsign Enter an Alpha numeric code After TX Enter a time after TX in seconds Every Enter a repeat time in seconds User Submenu My number if option available on radio This is the personal my number code of the user The Ascom gives alarm when receiving this code Step xxx This is the acceleration of the up and down key The longer this key is pressed the faster the the steps will be Keys When holding a key for a while they can be repeated Repeat Once only Settings clear memory All settings can be reset using default settings Hardware Submenu IF 21 855MHz 20 945MHz This is the first IF and can be used for unwanted image signal rejection LP filters gt 20kHz raster This is the width of the LP filter for the receiver Status Diagnose When the red error light burns the problem can be shown here by pressing the key Common Submenu Options in here are reflections of settings available via other direct key seguences detailed earlier 19 Select call It is possible to store 10 names with corresponding tone code These tone codes can be transmitted with select call Select call Display Press D Press 0 Choose the name to call Press Changing and storing names or codes Display Press D Press 0 Choose
3. setting appears press D to change the setting ON OFF as required press 5 to exit the submenu press 5 to exit the MENU Example Change keypad beep volume from normal operation press D to choose a function press 4 to choose the MENU function MENU will appear top right If necessary press until Audio submenu gt appears press to enter the submenu press until Key Beep Volume setting appears press D to enter setting mode yellow LED will light press 0 or one or more times to lower raise the volume as required press D to exit the setting mode yellow LED will go out press 5 to exit the submenu press 5 to exit the MENU These are the menu items Shift kHz This is the value of the repeater shift TX Limit Transmission timeout after xxx seconds TX time limiter When entering zero the TX STOP is disabled Scan mode This is how the Ascom acts when receiving a signal Wait for silence Scan 8 stop Wait Audio Submenu RX mode FM PM This is a filter in the LF circuit PM FM modulation TX mode FM PM This is a filter in the LF circuit PM FM modulation Datakiller ON OFF Data killer on off Key Beep Keypad beep on off Key Beep Volume Keypad beep volume Roger Beep Transmits a beeptone before switching off TX DTMF tones mS This is the length of the DTMF tones ZVEI tones mS This is the length of the ZVEI tones
4. normal operation the radio does get quite hot 2 The display will automatically adjust the display brilliance to match ambient light levels A sensor for this is located to the top right edge of the display area 3 Most radio s will be supplied without battery backup for memory retention as the original use was in a trunked system and permanently connected to a vehicle 12v supply Further information can be found at the rear of this document As a result the radio may power up with erroneous power volume frequency settings Keypad overview To turn on off the radio momentarily depress the IO button If the button is held pressed in too long the radio will switch off Keys Function To adjust volume level lt Sguelch open close on RX 1750HZ tone on TX O gt 0 lt 4 four buttons allow up down of Mhz Khz frequency in VFO mode oO 0123456789 To enter a Channel frequency or number Scan Reverse shift A Go to call channel S Switch between VFO and Memory clear last command A Tone squelch On Off DTSS 5 tone T Confirm action button sequence erase last entry O Choose second function of next key Second function Keys 1 Change transmitter power 2 Change squelch level 3 Choose CTCSS tone TQ 4 Activate MENU 5 Activate status menu 6 Show name of memory channel 8 Choose channel spacing raster Don t scan this memory channel 0 Call with 5 Tone Shift none A Choose tone squelch code o Del
5. MENU There aren t enough front panel buttons to give every function it s own button so settings which are not changed very often are placed in a MENU with several sub menus to organise things better In menu most items can be selected by pressing the keys 0 and The items can be changed by pressing the button In this situation the yellow led will light From normal operation i e with a frequency on display the menu can be selected as follows Press D Press 4 Now press 0 and as left and right buttons to cycle through a small list of settings and submenus Press O to change an item or to enter a submenu If the item has a limited number of settings such as ON OFF then will toggle between them Otherwise a yellow indicator will light to signify a further setting mode in this case use 0 and to lower or raise a setting or key in a number in the case of numerical settings such as repeater shift and then press again to exit the setting mode and return to list of items yellow light goes off To exit the MENU or any submenu press any otherwise unused key such as numerical keys 1 to 9 this will take you back up a level Example Turn on off keypad beeps from normal operation press D to choose a function press 4 to choose the MENU function MENU will appear top right If necessary press until Audio submenu gt appears press D to enter the submenu press until Key Beep
6. User manual Ascom SE550 Transceiver E 7 8 fo SINE Jo Be M Mero Ms Er ioe x do Hr fo Document Revision history Revision Date Changes 1 5 2 August 2004 Initial release 1 6 6 August 2004 Typographical changes and better description of operation Keypad selection icons amended 1 7 14 August 2004 Changes to Transceiver operation text addition of tone squelch and tone burst information 1 8 18 August 2004 Better info on memories and battery backup added 2 0 24 August 2004 Re collated document New front page document history page unhidden and new page on battery backup added References to 5tvo removed 2 1 25 August 2004 Backup battery part number and assembly info added Web site reference link changed to rrguk org Front page referenced to RRG 2 2 29 August 2004 Battery backup DIY mods appended to document 2 3 8 September 2004 Changed references to IF options in hardware sub menu removed Dutch text in Ch9 2 4 9 October 2004 Minor changes to button definitions Page4 Squelch definition Page9 2 5 8 April 2005 Minor text mods and changes to the use of the telephone button Link to French web site added Note about erroneous power up settings added 2 6 27 November 2006 Changes to 18 Menu To assist in understanding how the menu command operates Thanks to Andy GJ7JHF Web site reference for RRG changed 2 7 24 June 2007 Update to website links
7. ed as follows Display Press O Choose Function Press 6 9 Erase a memory channel Display Go to the memory mode key S Enter the channel to be erased Press D Choose Function Press S Press D 10 Erase the call channel Display Go to the call channel key A Press D Press A Press D 11 Entering text Text has to be entered the same way as entering text on a phone Entering the letters A B or the C has to be done by pressing the 2 several times The button is for erasing a character the remaining characters are shifting back just like the DEL key in a word processor The remove from column Si key is used to insert a space With the arrow keys up and down are used to step through the character group of the selected key The cursor has to be moved by pressing the arrow keys left and right 12 Scanning It s possible to scan in VFO mode and Memory mode Scanning all frequencies Go to VFO mode with the key S Press Scanning the memory channels Go to the memory mode with the key S Press Press any other key to stop scanning The red 9 light indicates scanning If the transceiver has found a signal the scanning can be continued by pressing again 13 Lock out memory channels Scanning the memory channels will scan all channels in the selected bank With the lockout function each channel can be disabled for scanning It s possible to skip several memor
8. ed with internal memory backup battery Details of the location of this battery may be found later Call channel mode If the call channel is programmed this frequency can be selected very quickly The advantage of the call channel is it can be selected by only pressing the o key 2 Choose CTCSS tone if option available on radio Some transceivers and repeaters use CTCSS only transmitters which send a low frequency tone of 67 250Hz will be heard All others transmissions may be ignored The frequency of this low frequency tone can be selected as follows Display Press D Press 3 The lowest frequency is 67Hz en the highest 250 3Hz between those values 3 Tone squelch Selcall if option available on radio Selecting code This code can be selected as follows Display Press D Press A Now select the tonecode for the receiver The code must be entered with the keys 0 9 when the number are flashing its a DTMF tone Press D Now select the tonecode for the receiver 3a Tone Burst DTMF tones A tone burst will be generated by pressing the squelch open key while transmitting DTMF tones may be entered directly on the keypad whilst transmitting 4 Chosen channel step space Display Press D Press 8 The channel step spacing can be changed by pressing the keys 0 en 5 Storing memory channels It is possible to store 100 channels in each bank Store channels as follows Display G
9. ete store call channel S Delete store memory channel After switching on the transceiver the selected frequency or channel will be shown at the upper line of the display After receiving a 5 tone code the code will be printed at the second line of the display The selected memory bank is indicated at the right of the second line To use the second function of the keys press the button The text Choose function will appear on the second line of the display Now the second function of the next key will be activated To go back to the normal situation press again or use the button 1 Choose frequency The transceiver has three frequency modes with the S button can be changed from VCO to Memory The third mode is the call channel this one can be selected with the key VCO mode At VCO mode all frequencies at the chosen channel spacing can be entered with the keypad For the frequency 70 012 500 by a channel space of 12 5kHz you have to enter 7001 Memory mode The Ascom has the possibility to store 100 memory channels in one memory bank it has 7 memory banks These channels are available in the memory mode In this mode each channel can have its own name of max 23 characters If the selected channel number is empty the Ascom will generate an error beep and ignores the selected channel Please note memory storage is dependant on power being available to support memory storage although some radio s may be fitt
10. in the photo above Solder the battery wires as shown above Ensure that the ve battery terminal is connected so as to bridge the solder bridge as without the bridge being in place battery backup is not enabled Locate the insulated battery in the front of the chassis ensuring it is not in the way of the front panel upon re assembly as shown above Finally re fit the front panel microphone allen screws and code plug if used and test the radio to ensure battery backup works If the above is successful you now have a working memory backup for your Ascom radio The life of the battery is not known at this stage but should provide several months backup as a minimum assuming the radio is regularly used as well To date I ve had one going for 2 5 years Andy GOBEQ June 2007
11. ite http home 1 tiscali nl moertje condor3000 condor htm There is a lot of useful information on this site but it is in Dutch An alternative set of software not free with additional functionality can be found at http home planet nl kolle049 condor html Once again this page is in Dutch http f5jtz free fr pjacquet radiotel ascom htm A large amount of information albeit in French 70MHz 4m UK Band Plan 70 000MHz to 70 030MHz Beacons 70 030MHz Personal Beacons 70 030MHz to 70 250MHz SSB CW 70 150MHz Meteor Scatter calling 70 185MHz Cross Band activity centre 70 200MHz SSB CW calling 70 250MHz to 70 300MHz All Modes 70 260MHz AM FM Calling 70 300MHz to 70 500MHz Channelised Operation 12 5kHz Channels FM Calling Channel 70 4500MHz FM Simplex used by GB2RS 70 4250MHz Emergency Communications Priority 70 3500MHz 70 3750MHz 70 4000MHz RTTY Fax Calling Working 70 3000MHz Digital Modes 70 3125MHz 70 3250MHz 70 3375MHz 70 3625MHz 70 3875MHz 70 4125MHz 70 4375MHz 70 4625MHz 70 4875MHz Power Limit 22dBW PEP Permitted Modes Morse Telephony RTTY Data FAX SSTV Memory Backup battery details on microprocessor board These pages have been put together to assist in identifying modifying the Ascom radio with regards to battery backup used for memory retention Only a few of the radio s are already fitted with a lithium battery already inside however as the radio was pre
12. o to the VCO mode key S 70 Choose the frequency and if necessary select SHIFT and CTCSS Press Second function Press S Store in xx Choose a number to store the channel When an arrow appears and the chosen number is already used the old values will be overwritten Press D If you want give a name for this channel Name ll to move to next or previous character Letters are accessible as per a telephone keypad abc 2 def 3 ghi 4 jkl 5 mno 6 pars 7 tuv 8 wxyz 9 Press again D to store 6 Memory banks The Ascom has 7 memory banks each memory bank has its own 100 memory channels The advantage is that only channels in the selected bank will be scanned Select a higher bank Press If the selected bank contains only empty memory channels the VCO mode will be activated otherwise the Ascom switches over to the memory channels 7 Storing the call channel It may be easy to activate the most used frequency by only pressing the button This frequency has to be programmed as follows Display Go to the VCO mode key S 70 Choose the frequency and if necessary select SHIFT and CTCSS Press D Choose Function Press A Press D If you want give the call channel a name Name Press again D 8 Enable channel name Every memory channel can have its own name the displaying of the name can be enabled or disabl
13. the name or code to change Press Name Enter or change the name Press D to acknowledge Enter or change the numeric code Press O to acknowledge The O key is used to acknowledge any other key to cancel Connections Power 8 Loudspeaker 15 way D on back panel N B An adaptor with power and loudspeaker connections is normally supplied 1 VE power 2 VE power 3 Loudspeaker ve 402 4 5 6 AF Earpiece 6002 7 GROUND 8 GROUND 9 Ground for 10dB RF Power reduction can fit pot for variable power 22K 10W 10 Loudspeaker ve 40 11 PTT active L ground to TX approx 0 5mA at 5V 12 AF in 600mv 13 14 9V out 15 Microphone 100mv Code Plug Socket upper front panel 12 34 56 7 8 Jumper pin 7 to pin 8 A code plug EEPROM is not required for the units supplied by the Ridgeway Repeater Group but the rig will not power up without a jumper between the bottom two pins of this socket 7 amp 8 It is intended that a code plug or link will be supplied where possible Microphone lower front panel Microphone B 1mV 1 2 Not used 9V 34 PTT Earphone 5 6 Microphone Ground General Ground 7 8 Earphone Ground Reference Information On the Continent the ASCOM SE550 is often known as a Condor 3000 The EPROM software used to program the units was supplied by Stephen Tompsett of the Rugby Amateur Transmitting Society RATS Useful Web links www blob demon co uk Stephen Tompsett webs
14. viously used in a trunked radio system most do not It is possible to install a battery if you are confident in soldering electronics The following pictures show the radio s microprocessor board with and without the factory installed battery backup The above illustrates a radio with memory backup battery fitted A lithium battery Sonneshine 3 6v SL 340 or similar must be fitted in the radio to ensure that the data stays in the RAM when the main 12v supply voltage is switched off DIY approach assumes you are confident with yourself in electronics An alternative but just as effective installation of battery backup can be made by the following method To access the microprocessor board where the battery is fitted entails removing the front control panel two allen screws and the microprocessor assembly found behind the panel four cross head screws Flip up the handle and remove the code plug if one is fitted to gain access to the allen screw behind Remove both Allen screws along with microphone cable plug Remove the front panel by hinging away from the radio hinge is to the left side of front panel Obtain a vertical mount 3volt CR2032 coin cell lithium battery or similar and solder 40mm of wires as shown above Insulate the whole construction keep it at thin as possible Identify the Battery connections on the radio and also the solder bridge that will need to be bridged with solder as shown
15. y channels while scanning Display Go to the memory key S Choose the channel Press D Press The red light indicates the lock out function To undo this repeat this 14 Transmitter power The output power of the transmitter depends on the following conditions The value selected in software External power control potentiometer VSWR Temperature Changing power setting in software Display Press D Press 1 The power can be changed by pressing the buttons 0 and Acknowledge with any other key 15 Selecting repeater shift Switching on and off the shift Display Press D Press It is possible to Switch off the shift display reads 70 Negative shift display reads 70 Shift positive display reads 70 16 Reverse shift The reverse shift can be used to temporary listen at the transmitter frequency and transmit at the receiver frequency With this function the input of relay stations can be monitored The reverse shift can be switched on and off by pressing the key only without first pressing the key 17 Changing squelch level Display Press D Press 2 The squelch level can be changed by pressing the keys 0 and The squelch has four levels Most sensitive Squelch level increased by about 5dB Receiver sensitivity reduced by about 20dB receiver feels deaf Squelch level high receiver very deaf 18 The
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