On Fri, 26 Aug 2011 02:24:06 -0700 (PDT), Ron wrote: >the x-lock tends to make the drift w/i the TR7 manageable.
No disrespect was meant. :) I've looked at these gadgets, and don't find them necessary. IMO a TR-7 that is drifting unmanageably is broken, and needs repair. My interest is more towards syncing the the 7-Twins for transcieve, which Drake finally got around to in the C-Line but seems to have forgotten again in the 7-Line. My TR-7 and R-7A, which were originally calibrated with the same frequency counter that was itself calibrated to a Rubidium standard, have gone off of each other a couple of hundred Hertz in transcive.. Not a lot, but enough for a discerning operator to detect. It is a very similar issue to the carrier oscillators in the 4-Line through the B series requiring periodic adjustment to stay in sync, but involves the 40 MHz master reference oscillator. I could compensate with the RIT, but the purist in me wants it to be spot on. No, the rigs aren't broken. :) What they are is of different age and thermal characteristics from each other. 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://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
