Bill, What source and load impedance are you looking at for this test?
Doug ----- Original Message ----- From: Bill Hudson To: [email protected] Sent: Saturday, December 30, 2006 8:12 PM Subject: RE: [Repeater-Builder] Re: audio equalizers for repeater audio-circuit correct?? To: Ken Cc: Laryn Tell you what Ken. I'll make you a deal. You have the facilities to do it, and you have the test equipment to prove it. I'll let you do the work. The time constant equation is the same, if you put the capacitor in front or behind the resistor. In fact: You could put a 7.5K in front of, and a 7.5K behind the capacitor to ground, and you should get the same time constant, roll off, de-emphasis. I have never tried it. Here's the deal. You build it and test it, and if you can make the de-emphasis different by placing the resistor before, after, or splitting them with 7.5K resistors on both sides, I will send you a crisp one hundred dollar bill ($100) in the mail. I've never done it - but where I went to school, it shouldn't matter. Let us all know what you find. If you find a difference, I'll send you $100. Of course, I'm going to be out $100, but then I'm going to go build it myself and make sure you're not fibbing! J Bill Hudson W6CBS ------------------------------------------------------------------------------ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Ken Arck Sent: Saturday, December 30, 2006 4:38 PM To: [email protected] Subject: Re: [Repeater-Builder] Re: audio equalizers for repeater audio-circuit correct?? At 04:25 PM 12/30/2006, you wrote: >Hmmm... I always thought that the resistor was on the input side. >Y'all sure this circuit is correct as it is above? <---You're right. The cap should be on the load side of the resistor, not the disc. side. As for the question about PREemphasis, the cap is in series with the resistor to ground on the load (transmitter) side of the cap. Ken ---------------------------------------------------------- President and CTO - Arcom Communications Makers of the world famous RC210 Repeater Controller and accessories. http://www.ah6le.net/arcom/index.html Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net
