[Boatanchors] Haligan and Xtal Filters

[BLIMPY]

Moore's "Communications Recievers"    3rd Edition  page 5  has a
chronological chart showing the emergence of new technological features in
communications recievers.

It was Lamb  - a very prodigious contributor to radio technolgy  - not
Halligan,  who published a description of a superhet with xtal filter in
August 1932 QST.


The crystal filter first showed up commerically  in  Hendricks and Harvey
Custom variation 1 reciever, Dec 1932.

Followed in quick sucession by Leeds Supreme (kit) , Hendricks and Harvery
variation 2, and then the National FBX,  in March and April 1933
respectively.

We know which of those was likely to have been made in any numbers.

Following them.. a whole slew of really famous and even iconic radios with
crystal filters followed:
McMurdo Silver
Hammarlund Comet Super Pro
RME-9
Patterson PR-12

In fact Hallicrafters didnt get on the bandwagon untill mid 1934 - long 
after
the crystal filter was an established fact of life in the few really good
radios of the day.

Halligan did a lot of things... but introducing the Xtal Filter wasn't one 
of them.


What hallicrafters did primarily.. was make cheap radios that included 
features pioneered by others, and made and plenty of them.

Kind of like Skoda made cars in the soviet union...( read 2 cycle clown 
cars)  Halligan made the S-38 and other AC/DC sets, and sets without RF 
stages.
Whoopee !