As discussed in the first RF discussion, the RF isolation is the ability of the reed relay to isolate the signal when the relay contacts are open. Because of the capacitance that exits across the contacts, some RF signal can ‘leak’ across the open contacts particularly as the designer increases RF frequencies. When one increases the reed switch gap distance, this decreases the capacitance which in turn improves the signal isolation. The gap distance increase is directly related to an increase in the ampere-turns (AT) of the reed switch. This will require a stronger coil requiring more power to operate or close the reed contacts within the relay.