[Boatanchors] Collins 3.1 KC filter question

[LeeCraner at aol.com]

The Collins 353A adapter was for the Hammarlund SP400 and National  HRO-60. 
 Their 353B adapter was for the SP600JX.
 
Both used 455KHz "F" series filters and were available in several  
bandwidths, including 3.1 KHz.  As previously mentioned, they plugged into  the 
receiver in place of the IF tube and had two tubes on top.
 
The Hammarlund HQ-215 also used Collins filters by its design.
 
73
Lee WB6SSW
 
 
In a message dated 9/13/2012 9:17:28 A.M. Pacific Daylight Time,  
w5jo at brightok.net writes:


Collins made those filters.  At one time I had a .5 a 1.5  and a 3.5 that 
plugged into the 1st IF tube socket in place of the  tube.  They used the 
mechanical filter Collins made and were designed  for the SP 200 and HRO 
60.

Jim
W5JO

>
> Good  Morning All,
>
> Collins made a filter for Hammarlund which is  designated
> "MFA-3 3.1 KC filter". Does anyone know which piece  of
> Hammarlund equipment this was for? Google was not my friend
>  in this inquiry.
>
>
> Brian Harris
> cell  214-763-5977
> email cosmophone at yahoo.com
>
>   I will check a Hammarlund catalogue I have but I
> believe  this was for the SP-600-JX.  Hammarlund had a
> mechanical filter  adaptor which plugged in one of the IF
> sockets. By memory it had two  tubes and the filter in it.
> The filter was not  switchable.
>
>
> --
> Richard Knoppow
> Los  Angeles
> WB6KBL
>  dickburk at ix.netcom.com

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