FWIW, my TR7 it sensitive to the house's temperature. If the house is about 72-73 degrees, the rig comes on and pretty well stays put but does still move. OTOH other temperatures during the winter or summer, and the thing drifts for about an hour before settling to a tolerable but noticeable drift. I have never taken the time to reference/measure the amount of drift, just that it is noticeable on QSOs (either that or everyone else is "always" drifting). I typically have the RV7 doing frequency control as it seems to settle down sooner and run more stable than the rig.
At some point, when I get the time, I am going to install a DAFC. I am a semi purest, but well engineered and executed mods are designed to make the rig better. If that offends the true purest, well I guess you can undo my mods when you own my rig. 73 Ron WD8SBB --- On Wed, 9/15/10, Garey Barrell <[email protected]> wrote: From: Garey Barrell <[email protected]> Subject: Re: [Drakelist] Drake 7 line drift To: "drakelist" <[email protected]> Date: Wednesday, September 15, 2010, 3:43 PM Evan - No WWV here with my indoor antenna, so using an Elecraft XG-1 signal generator on 7.040 MHz. Turned it on for 10 minutes, although I don't think it moves much as the internal dissipation is so low. Then turned on the R-7, cold start, and tuned in the XG-1 for a ~600 Hz tone. Using Spectrogram. It's been running for 20 minutes so far and has smoothly increased a little less than 200 Hz. No sign of leveling off yet. After an hour, it's stopped. Drifted ~600 Hz from cold start, and the last 15 minutes it's moved 5 Hz. I don't know how to go back on the 'strip chart' without stopping Spectrascope, so can't tell exactly where it 'stopped'. I only have about 15 minutes on-screen, but once I have the file, I can scan through it. I set the 'range' from about 400 - 1100 Hz on screen. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-B, C-Line& TR-4/C Service Supplement CDs <www.k4oah.com> K9sqg wrote: > Fellow Drake Enthusiasts, > > The discussion of the VFO stabilizers prompted me to describe what I > have observed about 7 line PTOs over the past 25 years or so. _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
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