On 08/12/2017 11:59 PM, Ken Brown wrote: > Hi Stan, > > Older version has two 9 MHz filter slots, but only one is for an > optional NAR (what the button is called) filter. More recent Omni VI have > three total 9 MHz slots, two being optional N1 and N2. Hi Ken, Ok, now I see. Thanks for your help! 73 Stan KM4HQE