Hi All, The manual for my T-4X states that stability is "LESS THAN 100 CYCLES AFTER WARM-UP". My question is simply this: how long, exactly, is an accepted period of "....warm-up"...?
After all of the hoops that I've jumped through in stabilizing the PTO in my rig (re-buiding it almost, actually!), I decided this morning to actually measure its drift. I used my ICOM 751A transceiver (in general coverage mode) as the frequency "umpire", and tuned it directly to the Drake PTO's output frequency of 5454.0-KHz. Both rigs were in the basement overnight, where the ambient room temperature was 59F. I measured the frequency a total of SIX times, i.e. (1) immediately at the start of the test, (2) 3 minutes into the test, (3) 15 minutes into the test, (4) 30 minutes into the test, (5) 1 hour into the test, and finally (6) two hours into the test... Here are my results: (1) 5454.0-KHz (cold start); (2) 5454.0-KHz (unchanged from cold start); (3) 5453.5-KHz (downward drift of 500-Hz from cold start); (4) 5453.0 KHz (downward drift of 1-KHz from cold start); (5) 5452.8-KHz (downward drift of 1.2-KHz from cold start), and, (6) 5452.8-KHz (unchanged). So---it looks like the rascal that I have here stabilizes after a good hour of steady warm-up, which leads me to suspect that maybe "warm-up" to the writer of the manual was, in fact, just that, i.e. one hour...? No matter, it was a most interesting exercise---and I sure would be curious if my rig's performance might match that of some of the other T-4Xs that are out there...although I dare say, probably not everyone has as thick a hide as I do in being able to withstand a 59F ambient room temperature...! Hi Hi. ~73~ de Eddy VE3CUI - VE3XZ _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
