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Full Spectrum Control Channel Scan vs. Non-Adjacent Site Search

Joined
May 19, 2019
Messages
90
Can someone explain the difference between Full Spectrum Control Channel Scan and Non-Adjacent Site Search in APX CPS. When would somebody use FSCC vs NASS. Can they use both at the same time?
From what I am reading online, it seems like FSCC is used for when you have a large trunking system and you don't want to program all the CC's into the radio, the radio will roam to a site without needing the CC programmed. What is NASS used for then? To me they seem similar.
 

KevinC

The big K
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Can someone explain the difference between Full Spectrum Control Channel Scan and Non-Adjacent Site Search in APX CPS. When would somebody use FSCC vs NASS. Can they use both at the same time?
From what I am reading online, it seems like FSCC is used for when you have a large trunking system and you don't want to program all the CC's into the radio, the radio will roam to a site without needing the CC programmed. What is NASS used for then? To me they seem similar.
Full spectrum scan should be a last resort. If your radio can't find a CC from either the adjacent site list or the last 10 CC's it saw it will start at the lowest frequency possible in whatever band the last CC was in and check every single frequency for a system ID/ WACN match. And every frequency it encounters that's busy when it checks will slow down the process.

If your system is multi-band (say VHF and 7/800) and the last CC was 700 but you are now in VHF coverage it could take forever to find the VHF CC.

Proper CC programming planning is a much better idea.
 

KevinC

The big K
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And before someone corrects me, I'm assuming the last 700 site you saw did not the VHF sites in the ACL.
 

kf8yk

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May 3, 2003
Messages
755
Normally once a subscriber radio is affiliated the radio only checks adjacent sites, aka site neighbor frequencies as broadcast on the control channel of the current site for roaming decisions. Enabling non-adjacent site search instructs the radio to check both the adjacent site list and the pre-programmed control channel list.

Even if non-adjacent site search is enabled the subscriber will only resort to the pre-programmed control channel list if all the adjacent sites RSSI's are below the acceptable threshold. If this criteria is met the radio will check the pre-programmed control channel list once about every two minutes.

Full spectrum scan can be enabled with non-adjacent site search. Full spectrum scan starts if the site neighbor list & the pre-programmed control channel list fail to find a site to affiliate with.
 
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