BCD436HP/BCD536HP: Do Avoids affect scanning speedster

[smcbmt]

Has anyone actually timed or found any information on how Avoids affect scanning time.

Suppose you set up a Favorites List A that had 6 trunked systems each trunked system has a number of departments and a Department of 100 conventional channels. 3 of the trunked systems and 50 of the conventional channels are Avoided.

Favorites list B contains only the three active trunked systems from list A and the Department with the 50 active conventional channels.

Assuming normal radio traffic will list A with the Avoids take longer to scan than the cleaned up List B that has no Avoids? Do the Avoids appreciably affect the scanning speeds.

 

[dave3825]

The less you monitor, the faster the scan rate

 

[smcbmt]

The less you monitor, the faster the scan rate

Does it that that long to process and bypass an Avoid that a series of Avoids adds appreciable time to a list?

 

[dave3825]

Not sure. Just know the more systems scanned, the more conversations missed.

I have many depts set to avoid and I feel mine scans pretty fast. I think someone did some tests for scan speed with different variables not long ago. I will link it if I can find it.

 

[ofd8001]

Conventional systems scan at a rate of 80 frequencies per second, if my memory serves me correctly. So if you are scanning 80 unavoided channels, it will take about a second to make a complete "loop" if there are no transmissions.

Please note that the scan speed is consistent regardless of the number of frequencies. The number of frequencies to be scanned impacts how long it takes to go around that "loop".

Trunked system scanning is a completely different creature. The scanner is "listening" to the control channel. The control channel does a lot of things including assigning voice frequencies for a talkgroup when there is a request to talk (button press). When a voice frequency is assigned, that is called a "Channel Grant". The scanner is "looking" at those channel grants and compares them to your scan list. If there is a match, then the scanner will go to the assigned voice frequency and listen to the conversation. Unlike conventional, with a trunked system, the scanner does NOT "listen" to each channel in the scan list to see if there is activity.