[Premium-Rx] Cathodeon crystal filters

[eprota at katamail.com]

Hi fellows! 
I need any information about Cathodeon (England) crystal filters at 1,4 MHz center frequency.
Especially I would know the difference between BP 4700 serie and BP 4600.
I would add a LSB filter to receiver R&S EK071 wich  now have only the USB type BP 4600-01. (-0,3 kHz....-3,4 kHz). 
For LSB I need the +0,3 ....+3,4 KHz filter, but I have found only BP 4706-10 type with 2,4 kHz passband. 
The reduced passband it's no a problem, but may be difference in input-output impedence?

Any suggestion is appreciated.
Thanks
73 de Errico IK8YSW
 

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