On Wed, 12 Oct 2011 18:09:10 -0700 (PDT), Bob Loving wrote: >Ron, I had a problem with one of my TR-7 rigs with the 40-MHz oscillator. To >recenter the frequency to something reasonable, I changed C1006 to 39-pF (was >50-pF). Admittedly, this probably changes the feedback ratio but it did allow >adjusting L1001 to frequency within its tuning range. This was on a radio S/N >6129 and was done 2009/10/27. The radio is still operating properly as far as >I can determine (no realignment since but no measurement of the oscillator >frequency either).
Per the Drake service notes at http://www.zerobeat.net/drakelist/tr7bookalign.html , it's suggested that the +10v adjutment be tweaked +/- .2 volts to avoid changint the crystal or capacitor. 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
