1930
October
Numerous Police Departments around the country are now licensed for broadcasting
on the medium wave police band. It will be 1933 until another Illinois station joins CPD on the medium band (21)
NYPD: WDKX is licensed on 1684 Kc/s (21)
(NYFD is WRBC licensed on 1596 Kc/s) (21)
Pasadena PD: KGJX is licensed on 1712 Kc/s (21)
(is Berkeley PD on before this? They have three letter call, KSW, but earliest info
I have is 2/32 on 1712 Kc/s)(21)
Cleveland PD: WRBH is licensed on 1712 Kc/s (21)
Michigan State PD: WRDS is licensed on 1662 Kc/s (21)
October 3,
Eight Oak Park PD squads
now receiving CPD transmissions
called: “Police Alarm System”(1)
October 17,
River Forest trustees disapprove Chief’s request
for squad car receivers
They say a receiver (to hear CPD transmissions)
at RFPD Station is good enough(1)
November 10,
RFPD installs first radio in squad car for
reception of calls
from CPD (Warren Ave.transmitter)(1)
November 21,
First assignment is dispatched to RFPD squad
This is accomplished by RFPD calling OPPD
who relays the info to
CPD dispatch center,
who then broadcasts back to the RFPD squad(s).
December,
Conference of Chicago, Suburban Police Officials advised to join with first
two police departments,
Oak Park and River Forest, to receive radio dispatches via direct hook up with CPD.
1931
October,
Detroit PD, WCK is on the air 24 Hrs per day(11)
500 Watts
December
Boston PD: WEY is licensed on 1712 KC/s (21)
1932
April(21)
NYPD=WPEE (Brooklyn-400W), WPEF (Bronx-400W),
WPEG-(Manhattan-500W)
on 2450 Kc/s(8) with 250(or 400)(21) radio cars,
2 man runabouts & 7 man limos(11)
(also listed for New York is: WCF marine, 1596 Kc/s
and by July: WRDU Brooklyn marine, 1596 KC/s)(21)
Chief Soderlin, erroneously states
that 2-way transmissions
by RFPD were instituted in 1932
and that it was the first successful
2-way radio system in country”(3)(16)(18)
1933
Washington State PD
radio receiver on motorcycle
(first dept?)(29)
May 3, (or March)(23)(24)(5)
****Bayonne N.J. PD first 2-way transmissions (10)(25)****
8.6 meters(about 34.6 Mc/s ) 25W base & 4.5W mobile(11)
31.1 Mc/s AM(27) 12 mobile units (21)
July 10th
Eastchester Township, NY PD institutes two-way police radio. W2XCT 20Watts /4.5 Watts W2XCS W2XEL two cars(28)34.6
Mc/s(21)
August
Highland Park, IL PD, WPFD
now broadcasting on 2430 Kc/s (8)
(Highland Pk appeared on police alarm list
in January but without call)
****First suburb to transmit on medium wave ??****
December 13
RFPD station “W9XB put on the air- 40.1 Mc/s”(20)
(frequency is sometimes listed as "41" Mc/s)
“The ultra-short waves”
license was applied for in October,
and when granted six weeks
of work followed
until 1st receiver was placed into a squad”(7)
“Lake Forest PD already has 2-way”(7)
****First in IL on 5 meters??****
1934
St. Louis PD and Cincinnati PD transmissions
are interfering with CPD broadcasts(4)(1)
January 2,
RFPD, W9XB reception ok, now goal is 2-way radio(1)
Lake Forest PD, IL reports they had 2-way radio in 1934(22)
****First 2-way in Illinois?****
February 9, (License issued)
RFPD issued license W9XB ‘til June 1, 1934
(41 Mc/s., A3 mode, 11 watts power out)(9)
(W9XA is assigned to NBC)(8)
March 3,
photo: RFPD 2-way radio(6-Mar.4)
Best document supporting first 2-way in RF
May
Piedmont PD (Calif) been testing 7 Meter,
2-way police radio for several months (21)
July 25,
At midnight RFPD, W9XB
went off experimental status
and into active 2-way radio dispatching
@40 Watts 41 Mc/s(6)
Month ?, 13,
RFPD photo in paper “First 2-way transmission”(6)
August
Detroit PD has 2-way(11)
August
NYPD plans for radios on motorcycles(11)
October
Boston PD considers GE two-way system(11)(21)
1935
January 20,
****APCO is formed(10)****
January 22,
RFPD “Captures Criminal” story,
with 2-way radio(6)
