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Summary of Contents for Microlog SWL
- Page 1 RADIO INTERFACE CARTRIDGE FOR THE COMMODORE ‘C-B4’ Complete terminal with software in permanent ROM for Receiving RTTY and MORSE Code. MICROLOG © MICROLOG CORPORATION 1986...
- Page 3 “SHORT-WAVE-LISTENER” will turn your computer into a complete listening post for those undecipherable coded signals you’ve heard. Note, the cassette provided with the SWL is not a program — it is to be played on a standard audio type recorder for demo purposes.
- Page 4 Baudot (pronounced “Baw Dough”) code. Occasionally you’ll find some ASCII in the amateur radio bands, but even there, Baudot is most prevalent. This is the code that the “SWL” will copy when first turned 0.1.2 Speed There are 5 standard speeds of Baudot (60-66-75-100 and 132 words per minute) only two of which are in common use.
- Page 5 They’ll sound just like real radio signals and may even have a buzzing “jammer” like quality. We have taken steps in the design of the “SWL” to eliminate these “leakage” signals, but there are certain conditions where you might have some interference. To verify that it really is the computer making the noise, simply shut it off.
- Page 6 It is not a program — do not try to “load” this tape. It is a demo of the SWL’s receiving capability and should be played on a normal audio cassette player. Connect the earphone or external speaker output of the...
- Page 7 Don’t turn the volume up too high because it will overdrive the SWL’s tone detector circuits and make mistakes in the copy. Make sure the nar. wide switch...
- Page 8 32777 then the ‘RETURN’ key (64 Basic memory shows 30719 bytes free with ‘SWL’ installed. Some programs that need the full 38911 bytes of memory will require that you unplug the ‘SWL’. Be sure to disconnect the cable to your radio first and always turn off the com...
- Page 9 2.2 VIDEO DISPLAY COMMANDS: The split-screen option is user selectable. The ‘CTRL S’ command is used to toggle the split-screen screen on and off. To remove the split screen and use the entire video display for receive text, TYPE: ‘CTRL S’ (HOLD ‘CTRL’...
- Page 10 Note also, the tuning indicators and the RX buffer flags are always displayed in red. You can move the entire video display horizontally with the CTRL H command. This should take care of monitors with limited horizontal sync tracking range. 2.3 TEXT/RCV COMMANDS: The text mode is useful for inserting your own notes in the printed copy off the air and for familiarizing yourself with the sound of the...
- Page 11 TYPE: ‘CTRL X’ (SPEED SELECT COMMAND NOTHING SHOWS ON THE SCREEN) TYPE: 66 (DESIRED SPEED) TYPE: ‘CLR/HOME’ (OR ANY NON-NUMERIC KEY PRINTS ]) Observe that the top line displays 0 6 6 W P M N O R To select an RTTY (BAUDOT) speed of 100 WPM (same as 75 baud), TYPE ‘CTRL X’...
- Page 12 change, whereas ‘BAUDOT’, pronounced ‘BAW DOUGH’ is a man’s name.) NOTE, you can omit the ‘CLR/HOME’ key if you enter the speed with three digits, 110, 066, 075 etc., since the program automatically ter minates the command on the third digit. 2.5 MORSE/TTY SELECT COMMANDS: Enter the MORSE mode by typing ‘CTRL M’...
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Page 13: Clock Commands
2.6 CLOCK COMMANDS: The SWL includes a real time clock with a 4 digit display of hours and minutes, and a 3 character time zone. When the unit is first turned on the clock is reset to 00:00. You can set the clock to start at any time by means of the ‘CTRL K’... - Page 14 If you do not, you will con tinue to store characters until you have filled the entire message buffer. Normally, each of the user programmable memories in the SWL is 512 characters, which leaves about 28,000 characters for the text buf...
- Page 15 “QUICK BROWN FOX . . . ” message, and following the “CTRL” by the “R” key, will recall the “RYRYRY . . . ” message. The two selective print memories can store up to 11 characters each. These are entered exactly as for the first 8 memories except that you access these memories by typing ‘CTRL 9’...
- Page 16 The entire text buffer may be cleared at any time by typing ‘CTRL CLR /HOME’. This will also clear the screen and place the system in the receive mode. You can repeat a segment of text by means of the ‘—’ key. To repeat the printing of a text segment first type ‘SHIFT —...
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Page 17: Audio Input
“SPKR EARPHONE” phono jacks on the SWL. These are con nected internally on the board. This allows you to plug one cable from your radio to the SWL, and one cable out to your external speaker or headphone, eliminating the need for a “Y” connector. Refer to the diagram showing the SWL rear connections. - Page 18 CHAPTER 4 ‘SWL’ RTTY OPERATION The SWL contains a dual tone demodulator designed to receive both amateur and commercial RTTY signals. The center frequency is around 800 Hz which is compatible with all shortwave receivers in common use. The “WIDE-NARROW” switch selects between 170HZ “NAR...
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Page 19: Selectable Options
When receiving Weather Reports, turn the ‘UNSHIFT’ option off, as they do not send a FIG shift after each group of numbers. When not in “UNSHIFT” mode, the SWL will simply react like a mechanical teleprinter. When enabled, the letter ‘U’ will appear near the right side of the top line. - Page 20 4.2 COMMERCIAL RTTY: Your SWL can be used to copy many commercial RTTY stations transmitting news bulletins and weather data. While the use of a general coverage receiver is most useful, you will find some signals just above the amateur HF bands, in the event you have a HAM-BAND only receiver.
- Page 21 4.3 DEMODULATOR: The proper demodulator circuit is automatically selected when changing modes. The dual tone (mark and space) is for RTTY and the 800HZ single tone decoder is for CW. You can, however, manually override this selection by typing ‘CTRL N’ (not recommended), which forces the unit to copy only one tone, mark or space, not both.
- Page 22 4.5.2 Commercial RTTY Weather information services (use “wide” 100 wpm Baudot code) 8140 KHz and 13625 KHz — KMIA — Miami, FL 13510 KHz — Halifax, N.S. News and press stations are found in certain areas of the radio spectrum. The following frequency ranges are generally where you’ll find them, with the lower frequencies more useful at night.
- Page 23 CHAPTER 5 ‘SWL’ CW (MORSE) OPERATION The SWL is designed to receive MORSE code up to a speed of 99 WPM. The received code will be properly displayed even though not sent by machine. The SWL will properly decode most hand sent MORSE provided sufficient spacing exists between characters.
- Page 24 “NOR/INV” does not function in MORSE. Disconnect the hand key input, and reconnect the audio from your receiver to the rear panel of the SWL. Tune the receiver to a MORSE signal, and place your receiver’s AGC in the fast position. The “WIDE- NARROW”...
- Page 25 You will also find that your receiver’s CW filter is helpful in reject ing nearby signals from interfering with the reception of the desired signal. The SWL includes a sharp 300HZ effective bandpass which is sufficient for rejecting undesirable signals. Your receiver’s AGC however may act in such a way as to reduce its gain due to a strong signal near the desired one.
- Page 26 Either (not both) can be used. If the Commodore printer is not connected or unable to accept data, the ‘V’ will not be displayed and the screen will ‘freeze’ for a few seconds until the SWL decides not to wait any longer for the printer ‘HAND-SHAKE.’ Note that the SWL expects the Commodore printer to be “DEVICE NUMBER 4”.
- Page 27 You will then be requested to press “PLAY” and “RECORD” on your data set. When memory save is finished, the program will automatically jump back to “SWL”. You can continue normal opera tion, or shut down knowing your programmable memories are safe on tape for later.
- Page 28 Another practical use of this program is to store often used paragraphs, name/address etc. that you want to include in a letter. Since the ‘SWL’ can access a printer, it makes a very simple word proc essor. Even with its limited editing function, the capability to recall whole blocks of text, mixed with direct keyboard input can be very useful at times.
- Page 29 / # / CHAPTER 7 ‘SWL’ KEYBOARD COMMANDS 7.1 ALPHA NUMERIC LISTING KEYS PRESSED DESCRIPTION CTRL A Go to ASCII code RTTY. CTRL B Go to BAUDOT code RTTY. Send clock time. Sends 4 digits plus zone. Time CTRL C sent is actual time of transmission —...
- Page 30 Split screen toggle On/Off. CTRL S MORSE speed-lock On/Off. Top line video CTRL T displays “LOCK’’ when enabled in speed-lock mode. If “LOCK” is not displayed when in MORSE receive, the automatic speed tracking is enabled. RTTY-ANTI-CW ON/OFF TOGGLE. This feature if enabled in RTTY mode will inhibit display of non RTTY SIGNAL.
- Page 31 backspace key (INST/DEL) which removes the in finite repeat command. CTRL + Go to “NOBMAL” RTTY demodulation (MARK LOW) CTRL-(minus) “INVERT” RTTY demodulation (MARK HI) CTRL £ User’s ID of up to 64 characters is entered by means of this command. Follow with the text and ter minate by pressing the ‘CLR/HOME’...
- Page 32 going to ‘TEXT’ without its being placed in the text buffer. SHIFT-(minus) Exit ‘BREAK BUFFER’ mode. Normal text buf fer is undistributed. (Go to receive first, other wise transmission of normal text buffer will com mence.) Place secondary ID text into text buffer. NOTE: SHIFT £...
- Page 33 > 7.2 USING THE RECEIVE BUFFER MEMORY: The SWL program provides for a 28000 character text buffer. 14000 characters of this can be set aside for a receive buffer that can ac cept data directly off the air for recall or printing. You must first ‘create’...
- Page 34 14000 characters are filled. Typing ‘CTRL O ’ again, erases the previously stored receive text. Note, CTRL F 5/F 7 do not control the printer, only receive data storage. To send data from this memory, hit the ‘< >’ key by itself. The ‘CTRL E’ command returns the text buffer to “normal”...
- Page 35 MICROLOG CORPORATION 18713 Mooney Drive Gaithersburg, M D 20879 Telephone: (301)258-8400 Telex: 908153...
- Page 36 SPEAKER HAND ------ ► EARPHONE KEY NAR. WIDE MICROLOG 18713 Mooney Drive Gaithersburg, MD 20879...
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