74 mhz

[scanner1]

I see some FD's getting licenses for 74 mhz. What would this be for? Alarms? I didn't think radios were made to transmit here.

 

[KF0SKV]

I see some FD's getting licenses for 74 mhz. What would this be for? Alarms? I didn't think radios were made to transmit here.

Most likely for low-powered non-voice radio transmissions, such as you mentioned to activate station alarms, garage door openers, lights, etc....

 

[ecps92]

Wireless Fire Alarm Boxes, Sensors and possibly ties to Remote TX/RX Sites

I see some FD's getting licenses for 74 mhz. What would this be for? Alarms? I didn't think radios were made to transmit here.

 

[scanner1]

Yea, my guess was fire alarm pull stations. I always figured 450mhz and up was used for remote rx/tx sites. The licenses are for "mo" mobile 2 watt units. I guess i'll try to plug it into scanner and listen in. If the scanner accepts it.

 

[snowscout]

This is interesting! What FD's are getting these licenses? I wonder if they know that this is close to if not on top of Radio Control cars (RC cars) frequencies. My RC crawler truck is 79 MHz.

 

[CT22]

Call box

These are most likely for street boxs that are actual two way radios. They function just like the old Gamewell systems but allow the dispatcher to actualy speak with the reporting party.

 

[ecps92]

Very Few of them are two-way, most are telemetry. Cost was the big factor in many cities/towns replacing the Wired Boxes.

These are most likely for street boxs that are actual two way radios. They function just like the old Gamewell systems but allow the dispatcher to actualy speak with the reporting party.

 

[ecps92]

74 Mhz and 79 Mhz have quite enough of a separation, so interference is unlikely. 5 Mhz is a large chunk of spectrum

This is interesting! What FD's are getting these licenses? I wonder if they know that this is close to if not on top of Radio Control cars (RC cars) frequencies. My RC crawler truck is 79 MHz.

 

[awasser1]

In other parts they use them as call boxes on the highway. since most have cell phones around CT. If u go somewhere like LA where they have call boxes they are placed like every mile.

 

[PJH]

Depending where in CA, and if its CalTran or County, its a mixed of cell, 450 and a few others. Where I was working in CA, we had a custom callbox in a remote canyon that was a 450 link to a VHF link to a MW site then brought into a Centracom Gold Elite resource at the fire department dispatch console.

I know some of CalTrans did a cable drop from phone to phone with a patch to the local telco ever 5? miles along I5 and other places. Out along Mojave they were VHF links along Hwy58.

 

[CT22]

Very Few of them are two-way, most are telemetry. Cost was the big factor in many cities/towns replacing the Wired Boxes.

Maybe in Quincy but here in CT the two systems I know of on 72 Mhz are two way.

 

[ecps92]

Which ones? so any RR DB info can be updated?

PS Quincy is-not / has-not every been anything but WIRED

Maybe in Quincy but here in CT the two systems I know of on 72 Mhz are two way.