"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- On Thu, 4 Oct 2007 11:11:26 -0600, DW Holtman wrote:
>Will a SP-75 Speech Processor really improve my signal, so in situations where >I'm barely heard, my signal will be easier to copy? How does it do this? >Dosen't increasing the audio cause splatter? Why didn't the original >manufactures use the most optimal audio modulation? To expand on what Evan said, the SP75 is a true RF speech processor that offers clipping as well as compression. It does this by converting the audio to double-sideband RF, processing and filtering it, and converting it back to audio. If you do some Googleing, you will probably find some good information on RF speech processing as the most effective type of processing. It does not increase splatter because of the built-in filtering (as long as you don't overdrive the radio, that is). It also has a noise gate circuit on the input to help keep unwanted background noise from being processed. On the practical side, I've used my SP75 with my TR7 at the LARC Field Day the past two years and gotten rave audio reports. The clipping action allows me to keep the audio peaks just below the ALC threshold (further reducing the possibility of splatter) while maintaining good average output. I'm sure an on-air demo could be arranged for you to actually hear one, since many list members use them. Fix it. Or sell it to me cheap, I'll fix it and use it... :) 73 -Jim -- Ham Radio NU0C TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
