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#6
March 9th 05, 12:53 PM
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"wb0gaz" wrote in message
oups.com... This is probably not that complicated (I hope?!?) but I need a PC program that would just tell a PC soundcard to generate a standard CTCSS tone (example 107.2 Hz) sinewave that could be fed into an older FM amateur transceiver. I don't want to find/buy/build a CTCSS module for it, and will have a PC handy. I imagine a WAV file could be created, but if there is some kind of software (perhaps a "function generator" program) that would be ideal, particularly if you could just give it the frequency in Hz or something like that, and get a steady sine wave out of the sound card. Very tks, 73 Dave WB0GAZ Dave - You may be missing the point of CTCSS. It is NOT like "Touch Tone" sounds that can be insert through the microphone input and pass through the audio chain. Never insert the CTCSS Output (from any CTCSS encoder board or source) to the microphone input of a radio. The radio's microphone audio stages will distort and attenuate the CTCSS signal (defeating the whole purpose) The most common place to connect the CTCSS Output to is just prior to the modulation stage in the transmitter. Typical connections would be: to the center of the deviation pot, to the varactor diode in the modulator circuit, or to the manufacturer's suggested connection point. This connection point for the CTCSS can vary from radio to radio. A schematic of the radio is very useful. Since the CTCSS Output from your sound card may be low impedance, you may have to install a series resistor to reduce the loading effects from the sound card (CTCSS) Output --- depending on the interface impedance. This is evident in the case of connecting to the center of a 10K deviation pot. In this case, a 10K series resistor will compensate for the impedance difference. In addition, a slight adjustment of the voice deviation may be required to compensate for the CTCSS Output circuit loading. The CTCSS encoders from ComSpec or PIEXX are easy to install and less than $50 . gb |
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