Depending on how critical your rice box is about having a pure 50 ohm load on it and the amount of voltage required at the grids of the amplifier, you may want to use a small tuner between the two but nearest the amp. If a less critical amount of match is required a balun or .25 wavelength 75 ohm ooaxial cable match might be used.
John, WA6BXO -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Edward B Richards Sent: Tuesday, October 18, 2005 10:27 PM To: [email protected] Subject: [AMRadio] need help Hi, you guys who are better educated than I. I want to drive a linear amplifier with a rice box that requires a 50 ohm load. The linear amp uses an input to a 170 ohm, 80 watt swamping resistor to ground, then through a .001 mfd capacitor, then through a VHF parasitic suppressor consisting of 4 turns of wire around a 47 ohm resistor, to the grids of a pair of parallel connected 4-400A tubes. What I need to know is the impedance of the input. Is it close to 50 ohms or do I need to use a matching network between the rice box and the linear amplifier. Thank you. Ed K6UUZ ______________________________________________________________ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami
