I have a dept. with 10x Minitor 2s that beep one time if the first tone of an adjacent township is activated. We have a fire district that is split in two, whereas, the northern county is toned out on VHF, and then normal com. is conducted on Apco 25 800 mhz, while the south end is strictly vhf com. all the way. The problem is that when the northern district tones out , their first tone is the same freq as the south's. The last tone is different in all dept's. The minitor will not do this on the bench, but will do it when dispatched in the field. I would almost want to say that when the first tone of the northern township is activated it's deviation may be too high, or just on the cutting edge that allows for this to happen.
Would anyone have an idea about this?
Jimbo
Minitor Falsing on higher tone freqs
Moderator: Queue Moderator
I had this exact problem a couple of years ago.
It was the length of tone "B" of the other department.
Normally these pagers are either two-tone (called individual call, but may used to activate a group of pagers) or they are single tone (called group call).
The normall timing of the tones are as follows:
Two-tone: First tone 1.0 seconds, second tone 3.0 seconds.
Single tone: 8 seconds (pager starts to alert at 5 seconds.
In some encoders the tone lenghts are set in software, others by resistor changes.
With a two-tone pager, the pager starts to beep soon after the second tone starts and continunes to beep for as long as the second tone is present.
Sometimes departments wanted a longer beep so they would extend the second tone to 5 or so seconds. If this was done and your group call tone is the same as their second tone, your pager may beep at the end of their second tone.
Try timing their second tone with a stopwatch. The second tone should be under 4 seconds. If it is near the five seconds, then it must be adjusted.
Having said all of that, I also thought that we may have had a bad batch of Minitor II at one time that also caused this problem. I will check my books early next week and re-post if that is the case.
<font size=-1>[ This Message was edited by: Alan on 2002-02-23 01:06 ]</font>
It was the length of tone "B" of the other department.
Normally these pagers are either two-tone (called individual call, but may used to activate a group of pagers) or they are single tone (called group call).
The normall timing of the tones are as follows:
Two-tone: First tone 1.0 seconds, second tone 3.0 seconds.
Single tone: 8 seconds (pager starts to alert at 5 seconds.
In some encoders the tone lenghts are set in software, others by resistor changes.
With a two-tone pager, the pager starts to beep soon after the second tone starts and continunes to beep for as long as the second tone is present.
Sometimes departments wanted a longer beep so they would extend the second tone to 5 or so seconds. If this was done and your group call tone is the same as their second tone, your pager may beep at the end of their second tone.
Try timing their second tone with a stopwatch. The second tone should be under 4 seconds. If it is near the five seconds, then it must be adjusted.
Having said all of that, I also thought that we may have had a bad batch of Minitor II at one time that also caused this problem. I will check my books early next week and re-post if that is the case.
<font size=-1>[ This Message was edited by: Alan on 2002-02-23 01:06 ]</font>