[Hallicrafters] FRG-7

[Gary Harmon - K5JWK]

Plus, you get to call it the "FROG-7."

Gary H. Harmon, Jr. - K5JWK
6003 Archwood
San Antonio, TX 78239-1504
210.657.1549h / 210.884.6926c

"Retirement means every day is a Saturday except Sunday"



-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of Robert Nickels
Sent: Friday, April 22, 2011 5:44 PM
To: hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] FRG-7

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
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