[Milsurplus] [spam?] LO DFing, the myth that never dies!

[mikea]

On Wed, Dec 02, 2009 at 02:11:10PM -0500, Ray Fantini wrote:
> With the development of the superhetrodyne receiver, modern style
> multi grid tubes, and the minimal amount of shielding between stages
> that almost every commercial or military receiver had by the mid
> thirties not to mention active RF stages that provide isolation from
> the mixer find it highly unlikely that much can be obtained or be of
> use from embassy listening at a distance of over several feet. Maybe in
> the teens and twenties when they still used regenerative receivers or
> some bread board triode stuff but not beyond that.

Let's stipulate that you're right, Ray. 

What were Peter Wright and his friends listening to, then, with their
specially-built TRF receivers?

-- 
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin