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(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 email@example.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.