According to my MSR2000 VHF manual, you already have a narrow-band station. That is, the MSR2000 is new enough that it was never made in the old "wideband" versions of a half-century ago.
All ordinary VHF MSR2000 stations were designed and built to operate on the standard 20/25/30 kHz channels using 16K0F3E emission, which calls for a maximum deviation of 5 kHz. The authorized bandwidth and the required bandwidth are not the same as the maximum deviation. The required bandwidth of 16 kHz for a narrow-band channel is derived from the sum of twice the maximum deviation and twice the maximum modulating frequency, or 2MD + 2MF, which is 2 x 5 plus 2 x 3 = 16 kHz. Thus, 16K0F3E emission represents the "conventional" narrow-band channels at VHF. This emission used to be called 20K0F3E, simply because the FCC added 2 kHz guard bands each side of the required bandwidth to create authorized bandwidth. I suppose it's possible that you have a one-of-a-kind MSR2000, but if it were truly manufactured with wider bandwidth than other stations, it should not require 2 PPM channel elements. The KXN1095A element is 2 PPM, and is provided with Option C601A, while the KXN1112AA element is 2 PPM, and is provided with Option C621A. It would be very helpful if you gave us the complete station model number. It should be something like C73KRB-3106A, or maybe C73KSB-3106A. Some of the letters and numbers may be different, but look for that format. I'd sure like to know why you believe that your MSR2000 station is not an ordinary, narrow-band machine. 73, Eric Lemmon WB6FLY -----Original Message----- To: [email protected] Subject: Re: [Repeater-Builder] MSR 2000 repeater NFM conversion At 03:00 PM 06/19/07, you wrote: >Greetings to the group. > >I have an MSR 2000 repeater. It is vhf and currently wide band (15 >KHz). It is using channel elements T KXN1095A and R KXN1112AA. I have >read that there is conversion to make this NFM (5KHz) spacing. >However, I can't seem to find this now. Any information would be >greatly appreciated.
