I just opened the accessory crystal panel on my R-4C I have a 13.1 and 13.6 crystal which is 2-2.5 and 2.5-3.0 Mhz. Is there any reason these 2 crystals dont appear in my crystal frequency chart? Next, do crystals have polarity or do I just plug them in any way I want to in the sockets? Thanks! 73 Bill k9BuB
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