[Scan-DC] Imagine if it was this easy to monitor today...

[John Wilson]

   I am sure for a period they also used the 2,000 khz. range  The big 
break thru came around 1937-8 when Motorola either invented or enhanced 
a viable two-way radio comm system using FM but used little because when 
WW2 began Motorola devoted it's priorities to the war effort.

John

Brian R wrote:
> I stopped by the Law Enforcement Museum a couple of weekends ago (it was free for Museum Day) and they have a small exhibit on radio communications where they had this description of early dispatching. Seems pretty amazing in light of today's trunking and encryption!
> -----------
> "The Detroit Police started broadcasting one-way radio calls to patrol officers over a commercial music station in 1923. To call officer's attention to a police broadcast, the station would play the tune 'Yankee Doodle.' Starting in 1933 two-way radio systems made communications between patrol officers and dispatch easier."
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