[Hallicrafters] FRG-7

[Robert Nickels]

On 4/22/2011 2:18 PM, bonddaleena at aol.com wrote:
> In defense of the Yaesu, I feel it's an excellent older radio
I agree Ron.  The beauty of the Wadley Loop is that it's a "drift 
cancellation" mechanism that is very elegant in concept and reliable in 
operation. Wadley loop receivers don't attempt to make the local 
oscillator stable, but eliminate the effect of drift instead, providing 
most of the benefits of a PLL without the phase noise and other 
drawbacks of poor quality PLL synthesizers.   Because they are by 
definition triple-conversion receivers there are some limitations, but 
most have been successfully addressed in the popular commercial designs.

My favorite Wadley loop receivers include the unique Barlow Wadley 
XCR-30 portable,  Racal  RA-17, and the amazing 64-tube WRR-2/FRR-59.

73, Bob W9RAN