User manual RAMSEY QT1

[. . . ] QUICK TONE CTCSS SUB - AUDIBLE TONE ENCODER DECODER Ramsey Electronics Model No. Looking for an easy way to update your rig with sub-audible frequency tones?· Sharing a channel using (C)ontinuous (T)one (C)ontrolled (S)ubaudible (S)quelch or PL ?Mini size quality circuit board designed to fit inside many transceivers. [. . . ] Notice that one end of the chip is also marked with a dot, notch, or band. Be careful not to bend any of the leads underneath the socket while installing this part. Identify and install disc capacitor C11, a . 01 uF disc (marked . 01 or 103 or 10nF). Form and install R4, a "stand up" 1 Meg ohm (brown-black-green). You don't have to worry about polarity; this component will work either way. QT1 · 9 18. Identify and install diode D1, 1N4002 (epoxy bodied component with stripe, marked 4002). Mount it "standing up", using care to ensure proper polarity. QT1 · 10 QT1 PARTS LAYOUT DIAGRAM 21. Notice that this component has a "flat" side with the writing imprinted on it. Again be sure to orient the part as shown in the parts diagram. QT1 · 11 25. 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. 0 = No Jumper X = Install Jumper TONE FREQ (Hz) 67. 0 69. 3 71. 9 74. 4 77. 0 79. 7 82. 5 85. 4 88. 5 91. 5 94. 8 97. 4 100. 0 103. 5 107. 2 110. 9 114. 8 118. 8 123. 0 127. 3 131. 8 136. 5 P5 P4 P3 P2 P1 P0 TONE FREQ (Hz) 141. 3 146. 2 151. 4 156. 7 159. 8 162. 2 167. 9 173. 8 179. 9 183. 5 186. 2 189. 9 192. 8 196. 6 203. 5 210. 7 218. 1 225. 7 233. 6 241. 8 250. 3 P5 P4 P3 P2 P1 P0 0 0 X 0 X 0 X 0 X 0 X 0 X X X X X X X X X X 0 0 0 0 X 0 0 0 X 0 0 0 X 0 X 0 X 0 X 0 X 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 X 0 0 0 0 0 0 0 X 0 X 0 0 0 X X X X X X X 0 X 0 0 0 X 0 X 0 0 X 0 X X X 0 0 0 0 X X X 0 0 0 X 0 0 X X X 0 0 X 0 X X 0 0 X X 0 0 X QT1 · 13 X X X X 0 X X X X 0 X 0 X 0 X X X X X X X X 0 X 0 0 X 0 X 0 0 X 0 0 0 X 0 X 0 X 0 X 0 X X X X X X X X X X X X X X X X X X X X X 0 0 0 X 0 0 0 0 X 0 X X 0 X X X X X X X X 0 0 0 X 0 X X X 0 X 0 0 X 0 0 0 X X X X X 0 0 X 0 X 0 0 X X X 0 0 X 0 X X 0 0 X X Select and program the desired tone frequency (e. g. Connect the PTT line to circuit ground while observing the the "OUT" connection. You should be able to detect the tone output (using an oscilloscope) and vary its amplitude using R7. [. . . ] If you need help, please read through your manual carefully, all information required to properly build and test your kit is contained within the pages!DEFECTIVE PARTS: It's always easy to blame a part for a problem in your kit, Before you conclude that a part may be bad, thoroughly check your work. Today's semiconductors and passive components have reached incredibly high reliability levels, and its sad to say that our human construction skills have not!All our kit parts carry the Ramsey Electronics Warranty that they are free from defects for a full ninety (90) days from the date of purchase. [. . . ]