[Milsurplus] Using GDO to check bc-348 coils.

[Glen Zook]

Your Millen GDO is operating a lot like how my Millen operates.  However, you might try replacing the tube in the Millen to get more output at the lower end.  I have found that I have to "back off" on the level control to keep the meter from "pinning" at the high end of each range.

If you notice, there is a considerable "overlap" in frequency coverage among the coils.  I think that this may be the result of Millen recognizing the lower readings at the low end of each range.

Do you have the auxiliary coils for the low frequency ranges?  Those come with a graph which correlates frequency to a log scale rather than having the dial calibrated for the actual frequency.

Glen, K9STH

Website:  http://k9sth.com


--- On Mon, 9/27/10, John Hutchins <olegerityincj at austin.rr.com> wrote:

I purchased a GDO Millen 90651 tube type, of course! , to see if the  coils meet published Q at rated frequency. In manual.
 
So the GDO Millen 90651 is not acting correctly in my opinion.  It goes from .15 ma to 1ma consistently no matter which coil is plugged in when  rolling, tuning,  from low to high frequency.
 
Since Q = F1 / 2* (F1-F2) where F2 = 70.7%  of F1
 
So when the meter is around .15ma it is tough to : 1. Get or find a dip; 2. Find %70.7 / from the dip just a tad difficult?
 
Since the coils are all good on the GDO.  A signal is detectable on the radio.   I was hoping for a pointer to a AH-HA problem, solution.....