[BC] AM loop receiving antennas

[RichardBJohnson at comcast.net]

When Sparta was making those turntables, I pointed out to John Fernandez, the Chief Mechanical Engineer, that a single ball in the center of a well is NOT a bearing! I demonstrated that a commercial thrust bearing consisting of some balls in a race, could be dropped into the hole and then you would have a real thrust bearing! To demonstrate, I took the existing design, ran it at 45 RPM and disengaged the idler. The turntable stopped in about 45 seconds. With the new bearing, I did the same and the turntable was still running after two minutes! Although John was impressed and agreed with me, the design was never changed because, "Everybody did it this way..." The new bearing, which fit perfectly in the existing design, costs about $2.00.

Cheers,
Richard B. Johnson
Book: http://www.AbominableFirebug.com/

----- Original Message -----
From: "Wayne Woollard" <woollard at inreach.com>

----- Original Message ----- 
From: "Ronald J. Dot'o Sr." <ron.doto at comcast.net>

> Rat Shack used to sell a tunable one, cat.# 15-1853 that works fairly
> well.  I think CCrane.com carries some too.
>
> Ron D

I recall the Rusco Rumblemaster, and the QRK's.  Biggest problem: improper 
lubrication of the ball bearing at the bottom of the mounting shaft.