Browning Receiver Crystal 22.500 for Lower Channels Mark IV/IVA Browning Receiver Crystal 22.500 for Lower Channels Mark IV/IVA. This crystal will allow a Mark IV/IVA receiver to receive below channel 1. This is not a standard Browning crystal. (Crystals will be listed by there frequency in MHZ i.e. 16.000 as the part number. If the Browning or Tram part number is known it will be listed in the description. To help control inventory we limit the inventory of crystals available. If you find what you need is not available please contact us, we may be able to increase the inventory or let you know when more will be available.)