Programming 12.5k or 25.0k ?

[radiotech]

Gents,

I'm in the middle of programming one of my little sweethearts and have a good question to ask, if I am programming a specific band (in my scenario UHF frequencies) I have the option of using 12.5KHz or 25.0KHz steps. Does it matter which one I select (and why)? I am aware that VHF frequencies around the 150-160MHz range have a 12.5KHz steps and the UHF band has 25.0KHz steps but are there any advantages to having 12.5KHz steps selected on the UHF band?

Cheerio, thanks!

RadioTech (Not literally)

[vk6hgr]

are there any advantages to having 12.5KHz steps selected on the UHF band?

MPT trunking systems up at 415MHz or so use 12.5KHz steps. The ACMA have a discussion paper out at the moment that proposes moving all services at ~400MHz (including UHF CB!) to 12.5KHz stepping.

[VK6DF]

12.5k = Narrow band 25k = wide band

VHF went narrow band to make more space for other services.
UHF is mainly wide band, but is very packed. the plan is to make it narrow and this will allow more channels within a band.

For high quallity transmissions wide band is better, but for normal voice and data narrow is more then enough.

For now (unless its for trunking) id set the uhf freq's to wide band trunking uses narrow, they can have many channels in one chunk of spectrum.

[robbage]

The other plan is to steal another 10MHz from 70cm as well