Frank -First, be sure to connect your counter to Pin 19 rather than Pin 21. You may be able to get enough shift by changing C1006 to 47 pF. Sometimes spreading or compressing the turns on L1004 will buy a little more shift. Be sure the 10R bus voltage is at least 9.97V. It's also possible to shift the 40 MHz frequency by SLIGHTLY (no more than +/- 0.3V) adjusting the 10V bus. New crystals may be available from John Kriner.
The 53.695 MHz consists of the 40 MHz and the 13.695 MHz (BFO) oscillator, so the 40 MHz has to be right first!
You might find the attached document helpful if you don't already have it. 73, Garey - K4OAH Atlanta Drake 2-B, 4-B & C-Line Service Supplement CDs <www.k4oah.com> [EMAIL PROTECTED] wrote:
*Morning all,* *Deep into my new (to me) TR-7, I am attempting to align this unit.**I have a very accurate counter / analyzer (Aeroflex-IFR), and am attempting to align the 40Mhz and the 53.695Mhz oscillators.* *After setting the 10.00 Volts, I moved on to the 40Mhz and 53.695Mhz oscillators.* *When I attempt to align the 40Mhz, and approach 40Mhz with L1001, all seems well so I believe the coil is good but I lose lock as I approach 40Mhz. Closest I can get is 1.07kHz low. I do get about 1.9kHz swing in the adjustment of the slug.* *Second...when attempting to adjust the 53.695, I get close but cannot seem to get there. I am low 2.441kHz, as the closest I can get.* ** *While I believe the crystals are both off, is there any hints and kinks (adding caps, etc?) to get this back in alignment? * ** *Thoughts?* ** *Warm Regards, Frank, KG9H*
TR7 Alignment.pdf
Description: Adobe PDF document
