[Premium-Rx] WJ Tunable Filter 224

[Terry O']

Glenn,
I owned a few and always assumed they were made for Telco intercept  I 
only have these descriptions:

"Individual  filter for each channel.  Ch 1 output at 20.5 kHz. Ch 24 
output at 319.5 kHz.  440-size package used with CP-117 control panel.  
P/O MBC-101 system. 12/19/69"

The CP-117 is described as:  "Control panel for channelized tunable 
filter system.  Used with type 224 tunable filters.  P/O MBC-101 system."

The MBC-101 is described as:  "Multitone bandwidth compression system:  
Includes 22 ea. 224 tunable filters, 1 ea.  CP-117 control panel, 1 ea. 
EF-516 equip. frame,"

  ,
Terry O'
watkins-johnson at terryo.org
http://Watkins-Johnson.terryo.org
http://BlackRadios.terryo.org
Facebook:   BlackRadios & BlackRadioSwap






On 7/7/2020 10:29 PM, Glenn Little WB4UIV wrote:
> Does any one have any info on this filter?
> It is 12 inches long, 2-3/8 inches wide and 4-3/8 inches tall.
> It fits into a shelf with other filters.
> The rear connector is a D series with three coax and 22 signal pins.
> The front has coarse and fine tuning controls.
> Inside is a 10 MHz crystal filter with 6 kHz BW.
> There is a Relcom M6 mixer, a 10.13 MHz xtal and a box marked CEI 7761.
>
> If no information is available, I will start reverse engineering it.
>
> Thanks for any help.
>
> 73
> Glenn
> WB4UIV
>