Midian Electronics SPVD-2 Vehicle Detector TX User Manual 1100 userman
Midian Electronics Inc Vehicle Detector TX 1100 userman
users manual
31 Oct. 2001 Page 1 of 3 Software v. 4.0
Ph: 520-884-7981 Toll-free: 1-800-MIDIANS Fx: 520-884-0422
2302 E. 22nd St., Tucson, AZ 85713, USA
sales@midelec.com
THE ROAD RUNNER SYSTEM
SPVD-2 – DETECTOR/TRANSMITTER
QUICK INSTALLATION GUIDE
SPECIFICATIONS:
U.S. Patent # 5880682
FCC ID # NOWSPVD-2
NEMA Certification TS-1 & TS-2
Frequency Range 47.02 to 47.40 MHz
# of channels available 20
Channel Spacing 20 kHz
Operating Temperature -34° to +74° C
Relative Humidity 95% or less @ 40° C
RF Output 50 – 100 mw
RF Output FCC Legal Limit 100 mw
Spurious & Harmonic -55 dB
Frequency Stability .005% -34° to +74°C
Modulation ±3.3 kHz FM
Modulation FCC Legal Limit ±5.0 kHz FM
Data 2000 baud NRZ w/ error correction
TX power consumption 36 mA for 17 msec at 85 mW
Battery 13.5 V, 15 Ah alkaline D-cell pack
Battery safety fuse 200 mA auto-resettable poly switch
Magnetometer circuit voltage 3 V DC regulated
TX & final amplifier voltage 6 V DC regulated
Low Voltage Alarm Level 7.5 V
INSTALLATION:
PREPARATION: The SPVD-2 is shipped without the battery
installed in the detector. To install the battery, remove the four
bolts from the underground housing cube. The top half has the
detector already installed. Place the battery in the bottom half
of the cube. Plug the battery into the white connector on the
corner of the PC board and turn on the power switch SW8.
Secure the cube by tightening the bolts, going around evenly,
make certain the gasket is sealed firmly, but do not to crush
the gasket. It is strongly suggested to use a small amount of
anti-seize or grease on the bolts. Even though the bolts are
stainless steel, several years underground can cause them to
corrode.
Install the unit in the enclosed zip lock bag to keep mud and
cold patch off the FCC label and the screw heads and threads.
To install the detector:
1. Install the pole-mounted antenna and the Receiver at
the control cabinet (refer to a SPVDREC manual for
specifics).
2. Use an 8 inch core drill or jackhammer to dig a hole
for the yellow SPVD box. The unit should be buried
about 3 inches below the road’s surface, therefore
your hole should be about 8-9 inches deep. The
deeper you bury the unit, the greater the attenuation
of the radio signal, which will shorten the device’s
transmitting range. At a depth of 3 inches below the
road surface, the range of the unit will vary between
500 and 700 feet depending on soil composition and
moisture. If greater range is desired, try burying the
unit about an inch below the surface. For even longer
range, a concrete enclosure with lid can be purchased
from Signal Services. This allows the unit to be
practically flush with the surface and simplifies
changing the battery.
3. Remove all ferrous metal tools and vehicles from the
detection area (10 – 15 feet away). This will prevent
them from distorting the Earth’s magnetic field around
the burial site.
4. Turn the SPVD unit on its side for 2-3 seconds and
then return the unit to the upright position. This action
will cause the mercury tilt switch to put the SPVD-2
into test and calibration mode. The detector will
transmit a long tone, followed by a series of test
packets.
NOTE: When the unit is tipped on its side to activate
the transmitter’s test mode it draws maximum
continuous power. If the unit were tossed into the
back of a vehicle and landed on its side it will only
transmit for 10 seconds and then automatically shut
off to conserve battery. This prevents a dead battery
condition if the unit sits in the vehicle for a long period
of time before being set upright. To reactivate, set the
unit upright and tilt it for 2-3 seconds to activate
test/calibration mode.
5. The tone and test packets can be monitored with a
handheld FM scanner. You will need to program the
scanner to the appropriate frequency shown on the
FCC label. It may be necessary to turn off the squelch
to hear the data packs. These packs are
approximately 17/1000 of a second long. With a
walkie talkie verify with another technician that the
receiver in the control box is hearing the tone and
turning on its arrival, departure, and low battery lights.
6. During this time, install the unit into the hole with the
FCC label on top and the arrows pointing in the
direction of traffic.
7. Pour sand around and on top of the detector, while
making certain that the receiver is receiving the tone
and data packs.
31 Oct. 2001 Page 2 of 3 Software v. 4.0
Ph: 520-884-7981 Toll-free: 1-800-MIDIANS Fx: 520-884-0422
2302 E. 22nd St., Tucson, AZ 85713, USA
sales@midelec.com
8. After the last data pack is transmitted the SPVD
instantly measures the Earth’s magnetic field and
saves it to memory. Once auto-calibration has
occurred (last data pack was transmitted) the unit
should not be rotated or tilted anymore. Doing so will
require the need to tip the unit on its side and repeat
the calibrating process. While passing a magnet over
the SPVD, use the scanner and receiver at the
controller and once again verify arrival and departure
pulses.
9. Put cold patch or hot mix over the detector and wave
a magnet over the detector to simulate a detection to
verify again that the receiver is receiving the packets.
10. After these steps are completed, test the unit with a
vehicle. You may also want to use the tire of the
vehicle to pack the cold patch.
TECHNICAL NOTES:
1. The FCC has allocated 20 frequencies from 47.02 to
47.40 MHz for use by wireless vehicle detectors. The
FCC does not regulate spurious emissions from traffic
controllers; therefore many controllers will generate RF
noise on the 47 MHz band (usually 1 or 2 of the 20
frequencies). Midian recommends using a handheld
scanner to scan the cabinet for RF noise, to determine if
there are any channels with birdies generated by the
controller. Midian will also do an FCC database check for
any licensed frequencies in the area. Midian will then
avoid any licensed frequencies or those that have been
determined to have birdies at that intersection.
2. The SPVD-2 PC board has a dipswitch in one corner to
adjust the sensitivity of the detection zone. SW1 is closest
to the corner. The first 3 positions on the switch adjust the
sensitivity. With no switches selected the detection zone
is comparable to a six by six loop. The sensitivity can be
increased or decreased by adjusting the switch as
indicated in the Sensitivity Table located on the next page.
If the departure pulse is not required, turning SW4 on will
activate pulse mode, eliminating the departure pulse. This
will reduce battery consumption and add another year to
the battery life. This is typically done if presence detection
is not required. You must also turn on pulse mode at the
receiver.
3. If the detector will be installed within approximately 100
feet of the antenna, the power can be lowered to extend
the battery life. This is accomplished by adjusting switches
6 & 7 on the dipswitch. With pins 6 & 7 both in the on
position the power output is 95mW, with 6 on and 7 off 45
mW, and with 6 off and 7 on 85mW.
4. Switch 8 works as a power on/off switch. No power will
be supplied to the board with the switch in the off position.
SPVD OPERATION:
The SPVD-2 uses a dual-axis magnetometer to measure the
Earth’s magnetic field. IC-2 is a 12-bit AD converter that
converts the analog information to digital data for use by the
microprocessor IC-1. IC-1, IC-2 and the magnetometer receive
their power from IC-3.
When the microprocessor determines a vehicle is present it
turns on IC-4, a 6-volt regulator to power the transmitter.
Transmission time is 20 msec. The micro also transmits a short
data pack on Pin 12 during the last half of the 20 msec to tell
the receiver that a vehicle has arrived.
R30 and C21 acts as a splatter filter before data hits the true
FM varactor diode D8. D7AB, R31 and R32 set the bias point
for D8 and provides temperature compensation for oscillator
Q2.
Oscillator Q2 employs an 11.8 MHz crystal. L1 and C22 tune
the oscillator Q2’s output to the fourth harmonic. Q3 and Q4
amplify and buffer the 47 MHz signal from the oscillator and
then drive the final amplifier IC-5.
Inductor L-5 and capacitor C36 tune the base circuit of IC-5.
L7 and C40 tune IC-5 to 47.XX MHz while C41, L8, C42 and
C44 act as a low-pass filter and impedance matching to the
spiral antenna. Switches 6 and 7 allow the user to select Hi or
Low power options.
TUNING PROCEDURE:
Oscillator Q2’s collector tank circuit (L2) is adjusted by C26.
Tune for a peak level on TP9.
Buffer amp Q3’s collector tank circuit (L3 & C28) is tuned using
L3 and adjusting TP10 for a peak indication.
Buffer amp Q4’s collector tank circuit (L4 & C31) is tuned using
L4 and adjusting TP11 for a peak indication.
The input to IC-5 is adjusted using L5 and C36 and tuning for
maximum output power on J1 antenna connector. IC-5’s
collector tank circuit is tuned using C40 and peaking for
maximum RF power output. C44 helps match the low-pass
filter to the antenna connector. Tune C44 for peak power on
the antenna connector.
31 Oct. 2001 Page 3 of 3 Software v. 4.0
Ph: 520-884-7981 Toll-free: 1-800-MIDIANS Fx: 520-884-0422
2302 E. 22nd St., Tucson, AZ 85713, USA
sales@midelec.com
Sensitivity Table
Setting SW3 SW2 SW1 Vertical
Acquire Vertical
Release Horizontal
Acquire Horizontal
Release Explanation
1 Out Out Out 250 200 No 200 Recommended for standard traffic lanes
2 Out Out In 250 200 No 150 Slightly more sensitive than setting 1
3 Out In Out 250 200 No 100 Clustering effect for left-turn lanes
4 Out In In 250 150 No 100 Slightly more sensitive than setting 3
5 In Out Out 200 100 No 100 Setting for use under bridges
6 In Out In 150 80 No 100 Slightly more sensitive than setting 5
7 In In Out 320 200 No 200 Narrow lane setting – less sensitive
than setting 1
8 In In In 75 25 75 100 Highest sensitivity – for curb use
**Lower number equals higher sensitivity
The dipswitch has 8 positions. The end closest to the corner of the PCB is SW1. The ON condition exists when the switch
is pressed down toward the edge of the PCB. See arrow on pictorial layout.
SW4 Puts the unit into pulse mode when turned on. Otherwise, unit is in presence mode and will transmit a
departure pulse. Pulse mode reduces battery consumption and should provide another year or so of
battery life.
SW5 Used by factory for testing and tuning.
SW6 Low power radio transmission (45 milliwatts)
SW7 Medium power radio transmission (85 milliwatts)
SW6 & SW7 High power radio transmission (95 milliwatts)
SW8 Power on/off switch