This is a Kenwood YK-88CN optional narrow CW 270 Hz filter that is for used in a variety of Kenwood products.  This is a perfect filter to use for CW when you need to really sort out the signals and prevent side channel interference over standard CW filters that may be 500 or even 1000 KHz wide.  

The filter requires soldering to install it onto the circuit board.  Typically Kenwood will install a sideband filter in their equipment, but they have often considered CW to be optional and thus did not install this narrower CW filter in their receivers and transceivers.  Here is a list of known Kenwood equipment that can utilize this filter, but do not consider it to be complete as other equipment may also utilize it so we ask you to please research to verify the information:

180S

430S

440S

530s

830s

120 series

130 series

R-5000 receiver

and others...

Please use the Ebay shipping calculator to determine your shipping cost.  This cost includes proper packing materials for safe delivery and insurance cost against damage or loss.

Those buyers living outside the USA are also welcome to purchase from us.  We have shipped to 113 countries during the past 26 years on Ebay and we are happy to ship virtually anywhere in the world as served by Ebay's Global Shipping Program (which unfortunately excludes many countries in Europe due to strict customs requirements).  You may use the shipping calculator to determine your shipping cost.

Thank you for taking the time out of your busy day to look at our Ebay items!