[Boatanchors] Haligan and Xtal Filters

[Carl]

Halli had a xtal filter in 1935 in the SX-9. They may have patented an 
improvement later as there were several iterations between then and the 
SX-28.

Since the AGSX and HRO was sold to the military I have to laugh about 
Franke's claim. Halligan was still having his stuff built for him at 
that time.

Do you have any model designations to support those claims?

Carl
KM1H


----- Original Message ----- 
From: "Duane Fischer, W8DBF" <dfischer at usol.com>
To: "Carl" <km1h at jeremy.mv.com>; "BLIMPY" <blimpboy at sonic.net>; 
<boatanchors at mailman.qth.net>
Sent: Wednesday, December 10, 2008 4:57 PM
Subject: Re: [Boatanchors] Haligan and Xtal Filters


> According to former Hallicrafters Chief Engineer, Fritz Franke, (and I 
> have both a hand typed document as well as actual audio of it being 
> said, Hallicrafters invented, and patented, the crystal filter and was 
> the first company to incorporate it into a military receiver and later 
> in an available to the public receiver. This was about 1937 +/-
>
> ----- Original Message ----- 
> From: "Carl" <km1h at jeremy.mv.com>
> To: "BLIMPY" <blimpboy at sonic.net>; <boatanchors at mailman.qth.net>
> Sent: Wednesday, December 10, 2008 3:41 PM
> Subject: Re: [Boatanchors] Haligan and Xtal Filters
>
>
>> Thanks for the dates. I have all the 30's QST's and enjoy reading and 
>> rereading the articles.
>>
>> My FBX, FB7X, FBXA, or FB7XA, or whatever else you want to call it 
>> gets used regularly on 30M with HB coils. Its a very credible 
>> performer there and keeps an equally old 30W TX clone company.
>>
>> As far as the crystal filter, it was first described by William Cady 
>> in a 1922 IRE presentation
>>
>> Carl
>> KM1H
>>
>>
>> ----- 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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>>
>
>