CC RESOLUTION 945RESOLUTION NO. 945
A RESOLUTION OF THE CITY COUNCIL OF THE
CITY OF EL SEGUNDO, CALIFORNIA, ADOPTING
SPECIFICATIONS NO. 480728 FOR THE FURNISHING
AND INSTALLING A TWO -WAY RADIO COMMUNICATION
SYSTEM FOR THE POLICE AND FIRE DEPARTMENTS
OF THE CITY OF EL SEGUNDO$ CALIFORNIA,DATED JULY
28, 1948.
the City Council of the City of E1 Segundo, California,
does resolve, declare and determine as follows:
SECTION 1. That the following specifications, being
and to be known as "SPECIFICATIONS NO. 480728 FOR THE FURNISH-
ING AND INSTALLING A TWO-WAY RADIO COMMUNICATION SYSTEM FOR
THE POLICE AND FIRE DEPARTMENTS OF THE CITY OF EL SEGUNDO,
CALIFORNIA," be and the same are hereby adopted:
"SPECIFICATIONS NO. 480728 FOR THE FURNISHING
AND INSTALLING A TWO -WAY RADIO COMMUNICATION
SYSTEM FOR THE POLICE AND FIRE DEPARTMENTS OF
THE CITY OF EL SEGUNDO, CALIFORNIA.
July 28, 1948
SPECIFICATIONS NO. 480728
DESCRIP'T'ION OF WORK The work to be done under these
specifications shall consist of the
furnishing of all necessary materials,
tools, appliances, equipment, labor, and transportation for
the furnishing and installing a two -way police communication
system consisting of one main station transmitter and receiver
with remote control console; four mobile transmitters and
receivers for Police Department, three installed in automobiles
and one installed on a motorcycle; and three mobile trans-
mitters and receivers for the Fire Department, one installed
on a fire engine pumper, and two installed in automobiles;
all for the City of E1 Segundo, California.
All equipment shall be fully licensed and shall be
guaranteed to meet all of the requirements of the Federal
Communications Commission.
1-
The City of E1 Segundo, California, will furnish the
necessary room and location for the equipment to be installed
in the main station; will furnish all automobiles and motor-
cycle to be equipped with mobile units; will furnish the pole
on which the main station transmitter is to be installed; and
will provide the necessary power outlet.
Each bidder, in bidding, shall describe in sufficient
detail to adequately identify the same, the equipment upon
which bidder is bidding; shall furnish in duplicate a circuit
diagram of the main station transmitter and mobile transmitters,
specifying type of tubes, plate current and plate voltage, one
copy of which the City of E1 Segundo, California, may submit
to the Federal Communications C ommission with its application
for a license to construct and operate its two -way radio communi-
cation system; and may accompany his bid with any descriptive
data or statements which, to the bidder may seem appropriate
or pertinent.
FIXED M N STATION
RXO INTER The fixed transmitter shall be designed
for frequency modulation on a frequency
of 155.61 megacycles. It shall maintain
it's frequency with a deviation of less than .005 per cent with
temperature variation from zero to 125 degrees Fahrenheidt.
Direct crystal control with phase shift modulation shall
be employed. Pre- emphasis designed for a logarithmic increase
of ten decibels between 500 and 3,000 cycles shall be employed.
A deviation of five with a frequency deviation of plus or minus
20 kilocycles shall constitute 100 per cent modulation.
Po,,rer output shall be between 25 and 50 watte, and
power, ease of service and mounting will be considered as well
as price in the selection of the equipment.
It shall be designed for operation from standard 110
Volt A. C. mains.
The transmitter shall be designed for mounting in a suit-
able cabinet, together with fixed station receiver.
It shall be supplied complete with antenna and all
4
5
necessary incidental equipment.
All spurious radiations must be reduced at least
60 decibels.
XED AIN STATION
EIV AN�N50LE The fixed station receiver shall have
the same specification as for the
mobile receivers, except, as follows:
It shall be designed for mounting in the point
fixed station transmitter - receiver cabinet.
It shall use standard 110 volts A. C. power source.
It shall have volume control available on remote
control console.
The remote control console shall provide means for
volume and muting of the fixed receiver, a preamplifier for
a dynamic microphone, a carrier indicator and modulation
indicator.
The microphone supplied shall be a good quality,
eardiod type, dynamic.
The receiver, transmitter, remote control unit and
microphone shall be furnished complete in the unit price bid.
MOBILE SMI
TRANTTERS FOR
A T M E3 RE
PUMPERS Transmitters shall be designed for
frequency modulation on a frequency
of 155.61 megacycles. Direct crystal
control shall be used. The frequency tolerance shall be less
than .005 per cent with a temperature variation of from zero
to 125 degrees Fahrenheidt.
Bids will be accepted on mobile units between 7 watts
and 30 watts of power. Power, ease of service, and mounting
will be considered as well as price in the selection of equip-
ment. Transmitters shall be designed to operate from a
standard 6 volt battery except that which is to operate on the
fire engine pumper which shall be designed to operate on a 12
volt battery. Mechanical construction shall insure against
3-
premature failure due to vibration, shall afford ease of
service and provide protection from dirt and from articles
that may be carried in trunk compartment of an automobile.
Transmitters shall use phase shift modulation. A
deviation of five is to be maintained. A frequency swing
of plus or minus 20 kilocycles shall constitute 100 per cent
modulation. Pre - emphasis giving a logarithmic increase of ten
decibels from five hundred to three thousand cycles shall be
used.
Complete twenty kilocycle modulation shall be realized
by sneaking in a normal voice one inch from the microphone.
Limiter action shall prevent overswing on loud voices. Means
for controlling and testing the transmitter shall be available
with the normal teat equipment used at the transmitter proper,
for the purpose of alignment.
Transmitters shall have heavy metal dust covers,
mounting plates etc., which shall provide complete protection
from dirt, water or mechanical damage. The transmitters shall
be constructed on a heavy guage welded steel chassis, copper
or cadmium plated. The transmitter shall be easily removable,
without tools, for service and adjustment.
All plugs and cable connectors shall be heavy type
metal enclosed with screw type retaining rings which prohibit
accidentally jarring loose. Plugs shall be designed so that
no 'A' battery voltage is exposed. Battery cables shall be
heavy guage wire to minimize voltage drop. Battery lead must
be fused near 'hot' battery connections.
All tuning adjustments must be readily accessible
and require only a small screwdriver or tuning wrench for
adjustment. No retuning shall result when cover is placed on
transmitter. Separate metering must be provided for each
stage.
4-
All component parts shall be mounted so as to
withstand constant Jar and vibration. All heavy parts shall
be firmly mounted on the chassis. In as far as possible all
small condensers, resistors, etc. shall be mounted on ter-
minal stripe, and not be dependent on leads for mechanical
support.
A control head shall be provided which shall have
microphone plug, receiver volume and squelch, and indicating
pilot light.
Transmitters shall be sup-)lied complete with micro-
phone, antenna, cables, and all necessary hardware for complete
installation at the unit price bid.
Antennas shall be designed for roof top mounting,
with a stainless steel whip. They shall have adequate in-
sulation and support and be of such design that they will not
normally be damaged by striking foreign objects while the car
is in motion.
It shall provide water tight mounting, and it shall
be possible to replace the whip when necessary. A flexible
coaxial line shall be provided, together with all necessary
couplings.
The impedance of the line shall be such that a
standing wave ratio of two to one, or less, is realized_
Insulation in the coaxial line shall be solid low loss type.
All transmitters shall have all spurious radiations
reduced to a minimum of 60 decibels.
MOBILE RECEIVERS FOR
AUTOMOBILES AND FIRE
PUMPERS Receivers shall be designated to operate
kilocycles.
on 155.61 megacycles with a frequency
modulation of plus or minus twenty
5-
The receiver shall be a crystal controlled double
superheterodyne using two limiter stages, and a discrimination
type detector. All spurious responses must be reduced to a
minimum of 85 decibels. Response to a signal 120 kilocycles
off resonance shall be 85 decibels down minimum.
The receiver shall incorporate a noise amplifier and
rectifier circuit, so that noise peaks tighten squelch. A one
microvolt signal shall provide 20 decibels quieting. Squelch
shall open on one half microvolt.
The crystal furnished shall be capable of maintaining
it's frequency within two cycles per megacycle per degree cen-
tigrade.
All tuning adjustments must remain constant despite
Jarring and vibration. In general, construction details shall
be equivalent to those outlined for mobile transmitters.
Control of audio volume, squelch, microphone plug
and pilot light must be provided on control head.
Receivers shall use vibrator power supply and shall
operate from a standard six volt automobile battery.
MOBILE UNIT FOR
Pf0'i'b1�CYLLE Bidder shall furnish in detail his
own specifications for this mobile
unit to be operated on the same
frequency as the other units herein described.
PREVAILING WAGE SCALE The prevailing wage scale which has
been determined by the City Council
of E1 6egundo, California, and whloh
shall be a part of the contract for the work herein specified
Is as follows:
Radio Technician . . . . . . . . 61.55 per hour
Radio Technician Helper. . . . . 1.35 per hour
All foremen not mentioned separately classified shall be paid
not less than 17 -1/2 cents per hour more than the hourly rate
of the highest classification over which he has supervision.
C-M
Classifications not herein mentioned not less than
the minimum rate shown.
Overtime shall be one and one -half times the above rates.
Sundays and holidays shall be considered as overtime.
The minimum of per diem wages as above set forth con-
template in each instance a working day of eight (8) hours.
PAYMENT Thirty days after the completion of the work by the
contractor and its acceptance by the City Council,
the City shall pay to said contractor the entire sum found to
be due under said contract.
It is mutually agreed that no payment shall be con-
strued to be an acceptance of any defective work or improper
materials and contractor further agrees that the payment of
the final amount under the contract shall release the City of
E1 Segundo, California, its officers and agents, from any and
all claims or liability on account of the work performed
under this contract or any alteration thereof. "
SECTION 2. That the City Clerk shall certify to
the passage and adoption of this resolution; shall enter the
same in the book of resolutions of the City of El Segundo,
California, and shall make a minute of the passage and adoption
thereof in the records of the proceedings of the City Council
of said city, in the minutes of the greeting at which the same
is passed and adopted.
Passed, approved and adopted this 28th day of July,
A. D., 1948.
4 _
yor of the City Se
of gundo,
California.
ATTEST
/l/ 4
City Clerk/
(SEAL)
7..
STATE OF CALIFORNIA, )
)
COUNTY OF LOS ANGELES, ) SS.
)
CITY OF EL SEGUNDO. )
I. Victor D. McCarthy, City Clerk of the City of
El Segundo, California, do hereby certify that the whole
number of members of the City Council of the said city is
five; that the foregoing resolution, being Resolution No.
945, was passed and adopted by the said City Council, approved
and signed by the Mayor of said city, and attested by the
City Clerk of said city, all at a regular meeting of the
said Council held on the 28th day of July, A. D., 1948, and
that the same was so passed and adopted by the following vote:
AYES: Councilmen Baker, Swanson, Thompson and Mayor Selby;
NOES: Councilmen None;
ABSENT: Councilman Peterson.
City Clerk of th E egundo,
California.
( SEAL)
0