(User installed)  Includes an integral VHF/UHF filter to reduce the possibility of weak signal interference to very close by VHF/UHF radios, HTs etc.  Not required for normal KX3 operation.

If you would like your KX3 upgraded by Elecraft, you will need to obtain a RSA number. Please complete a Sales Form here or email sales@elecraft.com to request an RSA. Basic equipment service charge and shipping cost will apply.

This change is included with all new factory assembled KX3s with a serial number higher than 2406.
It is included with all new KX3 kits with a serial number higher than 2492.