jparks29
John McClane
Anyone know what amateur HTs support NB/2.5Khz channel spacing?
vx5?vx6?vx7? etc etc
vx5?vx6?vx7? etc etc
Where would you need 2.5 kHz steps?
Narrowband (what would be called "supernarrowband" under pre-narrowbanding nomenclature) is done at 7.5 kHz spacing on VHF and 6.25 kHz spacing on UHF.
As noted by gewecke, 2.5 kHz is the specification for bandwidth of the signal, not distance between carrier center frequencies.
BTW, the VX-7 does tune in 7.5 kHz steps, but uses only one bandplan for 2m and the rest of its VHF receive coverage. This means that, outside the ham band, you can't tune VHF narrowband frequencies correctly in most band segments. For the 6.25 kHz spacing on UHF, this is not an issue with that radio because there is only one FCC bandplan for everything above 420 MHz.
Where would you need 2.5 kHz steps?
2.5 kHz is the specification for bandwidth of the signal, not distance between carrier center frequencies.
Don't confuse deviation and bandwidth.
With my Icom V8, I can select wide or narrow transmit. Does this mean I'm selecting between 5Kc wide and 2.5Kc wide? Not sure. There is one ham repeater (that I know of) in Metro Detroit that is 2.5 kc.
So find the specs for the Icom V8, it may be what you are looking for. Seems like I had a dual bsnd Icom mobile that would select wide or narrow also. You may want to take a look at the different Icoms.
Actually, you are trying to relate deviation to channel spacing, not bandwidth.In the private land mobile radio world, radios are specified as having:
2.5 kHz deviation = 12.5 kHz bandwidth = narrowband
5 kHz deviation = 25 kHz bandwidth = wideband