In article

,

MarkAren wrote:



Hi all,



I have some crystal filters that I am hoping someone can help me

identify.



21.4MHz, possibly 6 pole, made from 3 x 3 pin HC-49u cans.



Appears to be about 15kHz wide at -3dB



Marking is 03047A



Any help with a data sheet or termination impedance will be most

welcome.



Thanks, Mark



Likely Motorola filters for their old Marine Vhf FM Modar series Radios,

at 21.4 Mhz... That was the Mid IF they used, before going to 455 Khz...



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