72 MHz

[edge99]

I've noticed that 72 MHz frequencies are licensed to large businesses and school districts . My question is what are these frequencies used for?

Nate

 

[N_Jay]

They used to be for RF links, but I have not kept up on there use recently.

 

[RevGary]

Some of those are for on-site driver education classes where an observer sends audible directions to students on the parking lot after school hours. Look for a 23 inch base loaded mag mount on the roof of the cars and a 40 inch stainless whip near the control/observation point.

 

[robbinsj2]

I haven't seen any for businesses in my area, all (a couple dozen) have been for school districts and are for wireless clock systems. The early licenses I saw showed many very low-power "mobiles" with digital emissions (11k2f1d, if memory serves, but possibly a different bandwidth). More recent license applications have shown a couple low-power mobiles and a large number of paging receivers, and note "wireless clock system" under the eligibility notes.

Also, these licenses usually correspond to completion of well-publicized renovation or new construction school projects.

Jim

 

[KF4ZTO]

at least here in VA, 72 MHz is used for wireless microphone links as well as wireless clock control data. There also seem to be some wireless mics in the 75 MHz range as well.

 

[k9rzz]

I hear some digital stuff in there, I'm guessing it's the clock control data.

John K9RZZ
Milwaukee