While using DSD+ to monitor the Portland P25 system, I've noticed a couple of things. Firstly, there are several talkgroups that have been detected (usually with 0 recorded transmission hits) that are not listed in the database. I'll list them below, and if anyone can ID what these talkgroups are, I'd be interested to know:
Talkgroups: 7, 88, 103, 277, 373, 511, 670, 825, 895, 1135, 1139, 1240, 1287, 1317, 1887, 1903, 2245, and 3859. Talkgroup 373 has over thirty hits, meaning a conversation of some kind occurred, a few other talkgroups have one or two hits, which I'm guessing was a momentary key up, and the rest have zero hits but they are seemingly registered as existing on the system.
Secondly, there are some things in DSD+ I'd like to correctly understand, and I've posted 3 screenshots that illustrate what I'm wondering about.
In the first window, there's an example of some transmissions that I occasionally see, which are usually very brief, automatically Locked Out by DSD+, and instead of coming up as a talkgroup (such as in the cyan numbers under "Target") they seem to be coming up as a radio ID number. Are these perhaps non-voice transmissions of some kind, or maybe private calls directly from one radio to another?
In the second window, the green text on the right hand side under "Source", as I understand it (and correct me if I'm wrong), typically shows the radio ID of the radio making that particular transmission. For some reason, the Oregon State Police talkgroup doesn't list a radio ID, but rather just "EXTERNAL" and I'm not sure what this means.
In the third window, I've noticed some occasional transmissions on talkgroups that fall within a much higher numerical range than normal (so far between 64000-64999) which are not listed in the database. I've also noticed that all of these talkgroups show their Source as "EXTERNAL", which I described in the paragraph above. If anyone can enlighten me to as to what all this means, it'd definitely help my understanding of how this P25 system works. Thanks!
Talkgroups: 7, 88, 103, 277, 373, 511, 670, 825, 895, 1135, 1139, 1240, 1287, 1317, 1887, 1903, 2245, and 3859. Talkgroup 373 has over thirty hits, meaning a conversation of some kind occurred, a few other talkgroups have one or two hits, which I'm guessing was a momentary key up, and the rest have zero hits but they are seemingly registered as existing on the system.
Secondly, there are some things in DSD+ I'd like to correctly understand, and I've posted 3 screenshots that illustrate what I'm wondering about.
In the first window, there's an example of some transmissions that I occasionally see, which are usually very brief, automatically Locked Out by DSD+, and instead of coming up as a talkgroup (such as in the cyan numbers under "Target") they seem to be coming up as a radio ID number. Are these perhaps non-voice transmissions of some kind, or maybe private calls directly from one radio to another?
In the second window, the green text on the right hand side under "Source", as I understand it (and correct me if I'm wrong), typically shows the radio ID of the radio making that particular transmission. For some reason, the Oregon State Police talkgroup doesn't list a radio ID, but rather just "EXTERNAL" and I'm not sure what this means.
In the third window, I've noticed some occasional transmissions on talkgroups that fall within a much higher numerical range than normal (so far between 64000-64999) which are not listed in the database. I've also noticed that all of these talkgroups show their Source as "EXTERNAL", which I described in the paragraph above. If anyone can enlighten me to as to what all this means, it'd definitely help my understanding of how this P25 system works. Thanks!
