On Mon, 28 Dec 2009 23:06:34 -0700, Peter Hoon wrote: >Am having difficulty running our Drake T4XC into a QRO Technologies DX 2500 >Linear Amp. > >Here is a description of the problem, things we've tried so far, and an appeal >for your ideas and input. > >The DX 2500 amp requires very little drive. > >Please suggest ideas to try.
Here's a thought. Look at the circuit diagram for the National NCL-2000. They used a tapped 50-Ohm dummy load in the grid circuit to allow two different levels of exciter power input - 100W and 20W. The side benifits were that no tuned input circuits were required in the grid, exciter SWR was always 1:1, you could tune the exciter up into the amp without putting a signal on the air, the input was truly broadband, and the amp did not require neutralization. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! "Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime." HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://radiojim(dot)exofire(dot)net http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
