[HBR] eBay NOS NATIONAL VELVET VERNIER DIAL ICN, Ham Radio (item 26002332...

[N2EY at aol.com]

In a message dated 8/24/06 8:53:18 PM Eastern Daylight Time, bob at atl.org 
writes:


> I like the National PW and gearbox. One needs a logging scale but hey,
> what's so tough about that?

Only problems with the PW and NPW drives are the cost and the fact that they 
cover the range in only 10 revolutions. (20:1 reduction, but the cap only 
turns one half revolution)

The ARC-5 tx and BC-221/LM caps have 100:1 reduction - 50:1 to cover the 
half-revolution.


 As for sliderule dials, DO NOT underestimate
> 
> the power of string and a long linear scale.
> 
> 

And a *big* main pulley!

73 de Jim, N2EY