System Saber III Channel Spacing

[WKirkpatrick]

I have two System Saber III Radios in the 450-470 range that I have used for years in the public safety sector and GRMS. With the narrowbanding around the corner is there any hope in using these. I do my own repairs and programming and have made no effort as of this note to research the issue. Would appreciate some help if possible.

[Tom in D.C.]

Program your radio to a 12.5 kHz split simplex and see if the transmitter deviation goes to 2.5 kHz. If it does you're in business but if it doesn't you've just got a radio that will do 12.5 kHz channels but remains wideband. My standard Sabers will do 12.5 but they stay wideband. There is a ton of recent information on this Board that covers this subject to the point of absolute boredom, so do a search and you'll come up with tons of stuff.

[WKirkpatrick]

Thanks......and will have to do a little testing. However if I remember correctly, when I programmed in frequencies for tactical and fire ground use that were supposed to be 12.5 Khz splits the deviation did dropped to 2.5Khz. However the 25 Khz channels remain at 5.0 Khz. Example 460.6000 Mhz and 460.6250 Mhz remain @ 5.0 Khz and 460.6125 Mhz drops to 2.5 Khz. I don't remember if the RSS has a "switch" that allows section per channel. Will have to get out the Service Monitor and verify before I go any further.

[Tom in D.C.]

Making the deviation switchable is easier than also building the radio with two IF paths for receiving, obviously, so if only your transmit goes to 2.5 kHz deviation then you'd be in business, and all you'd hear would be somewhat diminished audio from the radio since it might be using a 20F bandwidth rather than the 11F. It really would be worth your time to do some searching on this Board under the word "narrowband."