rumcajs_tr
Member
Hi,
I thought I could share some of my observations regarding the GSSI upgrade as I have a huge unencrypted TETRA network available so can test it.
START:
The GSSI MONITOR itself starts as described in the manual - it is ok to tune ANY TETRA frequency in VFO mode with T-TC mode and as soon as you long-press the SCAN button, the DV1 switches to MONITOR mode and evaluates the TETRA frequency. If the selected frequency is not the one with MCCH, the receiver automatically changes the frequency to the frequency with TETRA control channel - the one with MCCH - within the the specific LA (Location Area). LA is the area within radio coverage of a base station within which a mobile station is allowed to operate. In other words, the DV1 finds the control channel for the same LA as was the original frequency. However, keep in mind, that a large TETRA network usually has many LAs and not all station calls are routed to all LAs. For example calls from users, which operate only within city centre are routed only to LAs, which are situated (covering) the city centre. So if you tune to an LA located outside the centre, you won't hear these stations from city centre. So, always spend some time for finding the most active LA or the LA of your interest. Hint - use SDR# and TETRA plugin.
FIRST USE:
At first, you are presented empty favorite list and by pressing CLR, you switch to GSSI LIST (non favorite) and also press MODE button to switch from SNG to MUL mode (which means receive all GSSIs not only the one highlighted). The GSSI list starts to populate as soon as the GSSI is active (speaking).
ADDING AND NAMING FAVORITES:
When you select any GSSI in the "GSSI LIST" screen and press ENT, the selected GSSI is moved to the favorite list. When you long press ENT again on it in the favorite list, you are given a possibility to edit the name tag for the selected GSSI - however, here is the first "trick" - when you are in the proces of editing the alphanumeric characters for the name of the GSSI and another GSSI becomes active, the GSSI number changes and you find yourself suddenly naming the new GSSI instead of the original one. It only happens if you have MUL selected so don't forget to switch to SNG prior to naming a GSSI. One would expect the receiver to keep the GSSI number once you enter editing mode even in MUL mode, so you just have to keep thinking about this feature.
USING THE FAVORITE LIST:
As soon as you have few GSSIs on the favorite list, you can switch between "favorite" screen and "GSSI LIST" screen. Be careful as the receiver NEVER receives both lists simultaneously. When you are in the favorite screen and even when you have MUL enabled, you only hear those GSSIs, which are on the favorite list, but you don't hear any other GSSIs. On the opposite, when you are in the "GSSI LIST" screen, you only hear the GSSIs, which are NOT on the favorite list (unassigned) and you don't hear any GSSIs which are already on the favorite lists. The good thing is, that even when you are in the favorite screen, and you don't hear any non-favorite GSSIs, the GSSIs numbers are still being recorded in the background on the GSSI LIST and can be displayed later by switching to this screen - so you you can keep collecting the GSSIs in the background while listening to the favorites, it is just hard to tell later which one is which as you don't hear the audio when the GSSI is active as I mentioned.
TRACKING THE CALLS:
Yes, the MONITOR mode is able to track the selected GSSI call across the frequencies for the specific LA. So the call starts on one frequency and then goes on on another frequency and the DV1 is able to track it correctly. Definitely something you can't do without the upgrade - if you are in the VFO mode, you just "sit" on a specific frequency, so sometimes you only hear part of the call. As soon as the call finishes, the MONITOR returns to the control channel (the frequency with MCCH).
So far, these are my observations for today, if you have any questions, feel free to ask.
The TETRA network is not in my home city so I can test it only about once per week when I travel to the area, but I will try to test anything.
I thought I could share some of my observations regarding the GSSI upgrade as I have a huge unencrypted TETRA network available so can test it.
START:
The GSSI MONITOR itself starts as described in the manual - it is ok to tune ANY TETRA frequency in VFO mode with T-TC mode and as soon as you long-press the SCAN button, the DV1 switches to MONITOR mode and evaluates the TETRA frequency. If the selected frequency is not the one with MCCH, the receiver automatically changes the frequency to the frequency with TETRA control channel - the one with MCCH - within the the specific LA (Location Area). LA is the area within radio coverage of a base station within which a mobile station is allowed to operate. In other words, the DV1 finds the control channel for the same LA as was the original frequency. However, keep in mind, that a large TETRA network usually has many LAs and not all station calls are routed to all LAs. For example calls from users, which operate only within city centre are routed only to LAs, which are situated (covering) the city centre. So if you tune to an LA located outside the centre, you won't hear these stations from city centre. So, always spend some time for finding the most active LA or the LA of your interest. Hint - use SDR# and TETRA plugin.
FIRST USE:
At first, you are presented empty favorite list and by pressing CLR, you switch to GSSI LIST (non favorite) and also press MODE button to switch from SNG to MUL mode (which means receive all GSSIs not only the one highlighted). The GSSI list starts to populate as soon as the GSSI is active (speaking).
ADDING AND NAMING FAVORITES:
When you select any GSSI in the "GSSI LIST" screen and press ENT, the selected GSSI is moved to the favorite list. When you long press ENT again on it in the favorite list, you are given a possibility to edit the name tag for the selected GSSI - however, here is the first "trick" - when you are in the proces of editing the alphanumeric characters for the name of the GSSI and another GSSI becomes active, the GSSI number changes and you find yourself suddenly naming the new GSSI instead of the original one. It only happens if you have MUL selected so don't forget to switch to SNG prior to naming a GSSI. One would expect the receiver to keep the GSSI number once you enter editing mode even in MUL mode, so you just have to keep thinking about this feature.
USING THE FAVORITE LIST:
As soon as you have few GSSIs on the favorite list, you can switch between "favorite" screen and "GSSI LIST" screen. Be careful as the receiver NEVER receives both lists simultaneously. When you are in the favorite screen and even when you have MUL enabled, you only hear those GSSIs, which are on the favorite list, but you don't hear any other GSSIs. On the opposite, when you are in the "GSSI LIST" screen, you only hear the GSSIs, which are NOT on the favorite list (unassigned) and you don't hear any GSSIs which are already on the favorite lists. The good thing is, that even when you are in the favorite screen, and you don't hear any non-favorite GSSIs, the GSSIs numbers are still being recorded in the background on the GSSI LIST and can be displayed later by switching to this screen - so you you can keep collecting the GSSIs in the background while listening to the favorites, it is just hard to tell later which one is which as you don't hear the audio when the GSSI is active as I mentioned.
TRACKING THE CALLS:
Yes, the MONITOR mode is able to track the selected GSSI call across the frequencies for the specific LA. So the call starts on one frequency and then goes on on another frequency and the DV1 is able to track it correctly. Definitely something you can't do without the upgrade - if you are in the VFO mode, you just "sit" on a specific frequency, so sometimes you only hear part of the call. As soon as the call finishes, the MONITOR returns to the control channel (the frequency with MCCH).
So far, these are my observations for today, if you have any questions, feel free to ask.
The TETRA network is not in my home city so I can test it only about once per week when I travel to the area, but I will try to test anything.
Last edited:
