User manual RAMSEY QT1

[. . . ] QUICK TONE CTCSS SUB - AUDIBLE TONE ENCODER DECODER Ramsey Electronics Model No. QT1 Caught in the maze of low frequency tones?Looking for an easy way to update your rig with sub-audible frequency tones?Let the Ramsey Quick Tone do the job for you with digital accuracy! [. . . ] Identify and install diode D1, 1N4002 (epoxy bodied component with stripe, marked 4002). Be sure to face the band as shown in the parts diagram. Mount it "standing up", using care to ensure proper polarity. QT1 · 10 QT1 PARTS LAYOUT DIAGRAM 21. Install R1, 10K ohm (brown-black-orange). Notice again that this part is "standing up". Identify VR1, the 78L05 voltage regulator (marked 7805). This device produces a stable 5 volt reference for the circuit. Notice that this component has a "flat" side with the writing imprinted on it. Be sure to place the part as shown in the parts diagram. Again be sure to orient the part as shown in the parts diagram. QT1 · 11 25. Install a short length of red hookup wire to the +V connection. Install a short length of black hookup wire to the -V connection. CONGRATULATIONS You have just completed your QT1 Sub Audible Tone Encoder/Decoder. When you return, be sure to check over your work on the entire circuit board. Energizing the circuit board with solder "bridges" or misplaced components can damage your kit. A few well spent minutes now can save hours of troubleshooting and dollars in replacements for burned out parts. INITIAL HOOK UP AND TESTING While we know that you're probably anxious to "fire up" your kit, first we'll have to program a tone frequency for the unit to generate and decode. We'll also need to connect our circuit to the "outside world" to test. Hopefully, the following board description will help in deciphering the abbreviations that were used on the circuit board. ( - ) Voltage Input (GND) Open to Listen (Tone Squelch Override) (+)Voltage Input P0-P5 Programming Inputs (See Chart) Mute Receive = Mute Receive and Transmit Audio Inputs Receive and Transmit Audio Outputs PTT = Push To Talk 0 = Transmit Out = CTCSS Tone Output Tone Level Adjust QT1 · 12 QT1 TONE FREQUENCY PROGRAMMING Finally, it's time to set the tone frequency on the Ramsey Quick Tone. The following chart describes the combinations of jumpers for the various tone frequencies. An `0' indicates that a jumper block is not present, while an `X' indicates that there is a jumper across the pins. [. . . ] BE returned in fully-assembled form, not partially assembled. BE accompanied by the proper repair fee. No repair will be undertaken until we have received the MINIMUM repair fee (1/2 hour labor) of $25. 00, or authorization to charge it to your credit card account. INCLUDE a description of the problem and legible return address. [. . . ]