[Boatanchors] Haligan and Xtal Filters

[Duane Fischer, W8DBF]

Somewhere I must have missed your actual first name and callsign, sir. What 
are they? Thanks.

----- Original Message ----- 
From: "BLIMPY" <blimpboy at sonic.net>
To: <boatanchors at mailman.qth.net>
Sent: Wednesday, December 10, 2008 1:41 PM
Subject: [Boatanchors] Haligan and Xtal Filters


>
> 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 !
>
>
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