kc9cra
Member
By the title, it looks like this belongs in the am/shortwave dx forum, but it's about police monitoring, so I decided to put it here.
I'm simply looking to satisfy my own curiosity. Years ago, the police abandoned the am broadcast band, and were allocated 1.73mhz. Today, we have very advanced trunking systems and encryption methods using mainly uhf radios as well as some in the vhf high band. In some places however, local governments prefer to use vhf low. Part of this is because the region is crowded with users, but low band also comes in handy in a large county. It takes a whole lot less power to move a 30mhz signal across a county, say 20-30 miles or so, than a 450 or 855 MHz signal.
This having been said, do any of you older guys remember any clingers on to the old 1.73 freq. How late was it used. From what I have seen online, and someone confirm or deny this for me if possible, the 160m ham band doesn't start until about 1.75, and that area is classified as "fixed service", meaning that the stations must be fixed in place. What kind of users are on this freq? That might be an old allocation, and it might be ham now, but it's interesting to know.
I'm simply looking to satisfy my own curiosity. Years ago, the police abandoned the am broadcast band, and were allocated 1.73mhz. Today, we have very advanced trunking systems and encryption methods using mainly uhf radios as well as some in the vhf high band. In some places however, local governments prefer to use vhf low. Part of this is because the region is crowded with users, but low band also comes in handy in a large county. It takes a whole lot less power to move a 30mhz signal across a county, say 20-30 miles or so, than a 450 or 855 MHz signal.
This having been said, do any of you older guys remember any clingers on to the old 1.73 freq. How late was it used. From what I have seen online, and someone confirm or deny this for me if possible, the 160m ham band doesn't start until about 1.75, and that area is classified as "fixed service", meaning that the stations must be fixed in place. What kind of users are on this freq? That might be an old allocation, and it might be ham now, but it's interesting to know.