APX forced narrowband question

[telxonmaster]

I was recently reading about newer versions of CPS after 2013 not allowing non narrowband frequencies in the APX radios, and was wondering if this applies to the FPP frequencies too.

I have an APX 4000 in VHF, that was likely last programmed with CPS R14 or R15, but I have R18. I want to make sure I don't mess it up. Right now, I can take any frequency in FPP, and edit the bandwidth, I want to know I can still do that after using R18.

I believe that R15 was when this changed, and if so, my radio still supports this via FPP.

I also know that ham, MURS 4 and 5, NOAA and marine are still allowed in wideband 25KHz, and being this is mainly for ham, I should be fine.

I am familiar with Moto's CPS on other radios such as XTS, Jedi, etc, so this is nothing new to me.

 

[Project25_MASTR]

R14 doesn't pre-date narrowbanding. It shouldn't change how FPP operates.

 

[telxonmaster]

That's what I thought, good to know. I actually can't see using any non narrowband frequencies outside of ham or murs, but you never know.

 

[WA0CBW]

Maybe the National Weather Service?
BB

 

[telxonmaster]

Maybe the National Weather Service?
BB

According to what I've read, the NOAA channels aren't affected.

 

[N4KVE]

I just sold my 8000, but it had FW 14.52, & was last programmed with CPS 17. No problem with wide band on any freq, using FPP. It’s the flash code which decides if it’s wide band, or not.

 

[telxonmaster]

Awesome, sounds like I'm all set, just waiting on the cable.

 

[N4KVE]

This is the culprit which decides if the APX will do wide band, or not. Q507 12.5 kHz FCC Mandate. If Q507 is in your flash code, the radio is narrow band. So you do not want Q507 in your flash code.

 

[WA0CBW]

That is correct the national weather service is still wide band hence the need for a wide band authorization for those that would like to monitor the NWS on their narrowband radios.
BB

 

[GTR8000]

Even if the radio's FLASHcode does have Q507 - 12.5 kHz FCC Mandate, the radio/CPS knows what frequencies that applies to, and which are exempt.

As noted in the below screenshot right out of the APX CPS, you will still be able to use 5 kHz with those exempted frequencies.

 

[telxonmaster]

Interesting, mine does have Q507, but I can still enter in a wideband frequency via FPP outside of the approved ranges.

 

[telxonmaster]

Just used R18 on it, and it didn't change anything as far as FPP ability. Looks like I am set