11.2735 MHz Crystal Filter; Where is it used?

[WB2CAU]

Several years ago I bought some items that came from the estate of an SK.  There are some NOS crystal filters made by SDK, model SCH-113A, frequency 11.2735 MHz amongst the items.  Bandwidth is not specified on the label. 

A search on the web turned up MHz Electronics currently stocking 11 pieces in his inventory.  An email to them went unanswered.

Does anyone know what ham radio brand or model this filter might be from?  

[KA8WTK]

The only reference I found was for CBs.

[K3ZS]

If I recall, they were one of the oscillator crystals used in the digital synthesizer IC in CB transceivers.    It was the one you could change in some of them to convert to 10M.

[WU2D]

I have a TEW filter on the same frequency which was liberated from an old SSB/AM CB. This was the typical IF for the older crystal mixing style synthesized CB's of the late 1970's.

[K3ZS]

Looks like it was a filter frequency not a crystal frequency that you have.    The crystal in the synthesizers was around 10.8 to 11 something Mhz.    It was replaced with a 12 Mhz range crystal for a 10 meter conversion.