California GMRS Network
California GMRS Network is a network of G.M.R.S. Radio repeaters, remote base stations and hot spots "NODES" accessible to each other via Voice
over Internet Protocol. California GMRS Network runs on a dedicated computer (including the Rasperry Pi) that We host at Our Location's,
radio site or computer center. It is based on the open source Asterisk PBX running our app_rpt application. App_rpt makes
Asterisk a powerful system capable of controlling one or more radios. It provides linking of these radio "nodes" to other
systems of similar construction anywhere in the world via VoIP.
California GMRS Network primary use is as a dedicated computer node wired to Our repeater's or radio. Connections from
Californiagmrsnetwork.org, And other VoIP clients. Around The World!
(G.M.R.S.) = GENERAL MOBILE RADIO SERVICE=
Your contribution will enable us to support Our Goals and continue operations. We are very grateful for your generosity.
Powered by
The California GMRS Network tower was lost along with 5-UHF. Antenna's this last week! about $1,500 to $2,000 worth lost! asking for help to replace 100 FT. Tower And Antenna's And at least 3 coax cable's.
there is a place to donate if you like?
and please see Photo's
So, I guess This one-man thing's not going to keep going for long I Have No Help :(
Just a group of like minded people to enjoy radio communications. This is the GMRS
(GENERAL MOBILE RADIO SERVICE)
The California gmrs Network is a link of repeaters and Simplex radios connected to Hubs and the hubs are connected to other hubs across the country to give us access from the east coast of the United States to the farthest west of the United States the Hawaiian Islands and Through the Links We talk to United Kingdom. And the Country of Brazil, And the World!
This is another California g m r s network repeater built by lee (wrex300)
This was good friends BUT?
hope you can get it going!
This L C S has not been a part of this network for some time BUT! It is one that we bult For Chris at L C S. he just having hard time keeping it up and running on his side! it works fine just not for him! good luck Chirs.
This is another California g m r s network repeater built by lee (wrex300)
This Repeater is owned and Operated By Kevin (WRPH747) and Sara (WRQF278) of Tulare California.
This is another California g m r s network repeater built by lee (wrex300)
we have a few friends that's been helping and We are looking for more friends across this great nation join us
BE A PART OF THE FUN!
This Is A New Repeater Site Located on PARK RIDGE!
(GRANT GROVE) At Fire lookout! At About
7535 feet
N 36 43' 28.8"
W 118 56' 36.6"
TC1GMRS
((((462.700)))) +Offset (Pl 103.5)
This Is A New Repeater Site Located on PARK RIDGE!
(GRANT GROVE) At Fire lookout! At About
7515 feet
N 36 43' 28.8"
W 118 56' 36.6"
TC2GMRS
((((462.675)))) +Offset (Pl 103.5)
What is a Repeater and How Do You Use One to Communicate?
Want to get the best possible coverage in a marginal location, like inside a building or down in a valley? A repeater system can rebroadcast your transmitted and received signals to improve communications.
Repeaters and their antennas are generally located at high elevations—on towers, mountains, or atop tall buildings. To improve signals between radios, they use very efficient high gain antennas, low-loss feedlines and transmitter/receiver combinations that are rated for heavy or continuous duty. A repeater can increase your effective transmitting and receiving coverage, boosting the limited range of your transceiver alone.
How Does a Repeater Work?
I think of repeater operation as being much like running a relay race. The transmitting station hands off to the repeater, which receives the signal and passes it onto the receiving station. Since you push the transmit button to send and release to receive, only one side of the conversation is heard at any given time.
Antenna: Most repeaters use one antenna for both transmit and receive. It’s generally a high performance, durable, and efficient antenna with an omnidirectional pattern. They’re placed as high above ground level as possible.
Feedline: Repeaters use a rugged, low-loss cable called hardline. Actually, it looks more like flexible pipe with a center conductor than a cable. Hardline provides lower signal loss than conventional coax, which means more transmit power reaches the antenna and weaker signals can be received by the repeater.
Duplexer: The duplexer separates and isolates the incoming signal from the outgoing and vice versa. It prevents the receiver and transmitter from interfering with one another and helps to reject very strong nearby frequencies or other RF interference from getting into the repeater system. A duplexer typically has two bandpass filters connected in parallel. One filter provides a path between the transmitter and the antenna, and the other provides a path between the antenna and the receiver—there’s no direct path between the transmitter and receiver.
Receiver: Repeater receivers are generally very sensitive and selective, and capture signals that wouldn’t be clearly heard when transmitting directly from radio to radio. It is set to receive the input frequency from radio transceivers.
Controller: This is the brain of the repeater and is essentially a dedicated computer. It handles repeater station ID using either CW or voice and activates the repeater at the appropriate times. It sometimes performs a variety other function, such as giving programmed announcements or linking multiple repeaters.
Transmitter: Most repeaters have a transmitting section containing an exciter and a power amplifier. The exciter retransmits the received audio at the proper frequency and the power amplifier boosts its output.
Keeping Things Separate
To use a repeater, a station must use different transmit and receive frequencies. Without having an offset between transmit and receive signals, the repeater would only hear itself when it was transmitting on its receive frequency. For example, 2-meter Amateur Radio repeaters (144-148 MHz) use a +/- 600kHz offset between the receive and transmit frequencies. Repeaters in the 450-470 MHz band use a 5 MHz separation, Repeaters in the 462-467 MHz (GMRS) band use a 5 MHz separation, while ones in the 806-869 MHz band use 45MHz separation.
Using an amateur radio repeater pair on 146.94/146.34 MHz as an example, here’s how the process works. Amateur radio operators would transmit their signal on 146.34MHz input frequency, which is received by the repeater. The repeater rebroadcasts the original signal on 146.94 to amateur radios or other receivers listening to the frequency.
Another feature that can help minimize interference and keep the repeater operating smoothly is the subaudible tone (e.g., PL, Motorola’s trademarked tone system). Subaudible (low level) tones can be sent during transmit. The purpose of the tone is to allow you to key up a repeater so you can transmit through it. If your radio is not sending the proper tone, the repeater will not open and relay the signal. Subaudible tones act as a gateway to screen out unwanted signals on receive, such as unauthorized users or signals from distant repeaters on the same frequency that may interfere as a result of band openings.
Hams on Repeaters
Amateur radio has been around for more than 100 years, but repeaters didn’t appear on the amateur bands until the late 1950s. Most of today’s Ham repeaters are used for local communications on the VHF/UHF bands. Repeaters are utilized in many areas to extend communication range and provide emergency local communications.
GMRS Repeaters are new!
Typically, you’ll find repeaters between 144-148 MHz, 222-225 MHz, 420-450 MHz, (And GMRS 462.-467MHz) and 902-928 MHz Some still exist in the HF/lower VHF band from 29.5-29.7 MHz and 51-54 MHz, but their numbers have declined.
Though FM is still the most popular repeater mode, digital repeaters with DMR, D-STAR (like the DX Engineering employee radio club, N8DXE, new D-STAR repeater), and Yaesu System Fusion capabilities are making inroads. Both digital and analog repeaters can also be connected to online networks such as Echolink, AllStar, Asterisk. Links As in GMRS, Wires II, IRLP and others, allowing worldwide communication capabilities from a handheld radio.
FCC Licensing Information
Important
FCC Regulations state that:
1. The grantee of a license has the responsibility of assuring that all equipment
operated under that license conforms to the specifications of the license.
2. The RF power output of a radio transmitter shall be no more than that
required for satisfactory technical operation, considering the area to be
covered and local conditions.
3. The frequency stability, deviation, and power of a radio transmitter must be
maintained within specified limits. Specifically, FCC Part 90.215 states that
“the licensee of each station shall employ a suitable procedure to determine
that the carrier frequency of each transmitter authorized to operate with an
output power in excess of two watts is maintained within the tolerance
prescribed in 90.213...” It is recommended, therefore, that these three
parameters (frequency stability, deviation, and power) be checked before the
station is placed in service if modified.
Remember: The efficiency of the equipment depends upon a good installation.
Motorola recommends that adjustments to this equipment be made ONLY by a
certified technician.
Safety Information
The FCC, with its action in General Docket 79-144, March 13, 1986, has
adop ted a sa fe ty s tandard for human exposure to radio frequency,
electromagnetic energy emitted by FCC regulated equipment. Motorola subscribes
to the same safety standard for the use of its products. Proper use of this radio
will result in exposure below government limits.
The following precautions are recommended:
• DO NOT operate the transmitter of a MaxTrac radio when someone outside
the vehicle is within 2 feet (0.6 meter) of the antenna.
• DO NOT operate the transmitter of a fixed radio (base station, microwave,
rural telephone RF equipment) or marine radio when someone is within 2 feet
(0.6 meter) of the antenna.
• DO NOT operate the transmitter of any radio unless all RF connectors are
secure and any open connectors are properly terminated.
• TURN THE RADIO OFF when near electrical blasting caps or in an explosive
atmosphere.
• All equipment must be properly grounded according to Motorola installation
instructions for safe operation.
• All equipment should be serviced only by a qualified technician.
Refer to the appropriate section of the product service manual for additional
pertinent safety information.
Safety Standard
Installation Safety Warnings
Consider the occupants’ safety when you choose a location for the radio. Do not
mount the radio overhead or on a sidewall unless you take special precautions.
If someone were to remove the radio and fail to replace it properly, road shock
could bump the radio loose, and the falling radio could, in some circumstances,
cause serious injury to the driver or a passenger. In a crash, even when properly
installed, the radio could break loose and become a dangerous projectile.
If you must mount the radio overhead or on a sidewall, give it the added
protection of a retaining strap.
CAUTION: Installation of antennas with mobile radio equipment with transmitter
power in excess of 7 watts.
Note: For low-power MaxTrac radios (7 watts or less), there are no antenna type
or installation restrictions.
Non-Metallic-Body Vehicles — In non-metallic-body vehicles with transmitters at
any frequency having a power output in excess of 7 watts, do not install any type
of antenna closer than 2 feet from any occupant of the vehicle. Failure to follow
this procedure may result in the exposure of the vehicle occupants to radio
frequency energy levels higher than recommended by the FCC.
Metal-Body Vehicles — In metal-body vehicles with transmitters at any frequency
having a power output in excess of 7 watts, it is mandatory, when using a glassmount antenna, that the installation instructions covering the location of the
antenna at the top of the front or rear window and the cable routing be followed
exactly as described. Failure to follow this procedure may result in the exposure of
the vehicle occupants to radio frequency energy exposure levels higher than
recommended by the FCC.
For other antenna types, follow the existing installation instructions. The best
location for the antenna is at the center of the vehicle roof. A good alternate
location is at the center of the trunk lid.
Important: If installations different from these recommendations have already
taken place, immediately notify your local service representative so that
appropriate corrective action can be taken.
Operational Safety Warnings
WARNING:
• For vehicles equipped with electronic anti-skid systems, see “ANTI-SKID
BRAKING PRECAUTIONS” publication, Motorola part number
68P81109E34.
• For vehicles equipped with electronic ignition systems, check the service
manual for warnings about the use of two-way radio equipment in the
vehicle.
• It is mandatory that radio installations in vehicles fueled by liquefied
petroleum gas conform to the following standard:
National Fire Protection Association standard NFPA 58 applies to radio
installations in vehicles fueled by liquefied petroleum (LP) gas with a LP gas
container in the trunk or other sealed-off space within the interior of the vehicles.
This standard requires that:
1. Any space containing radio equipment shall be isolated by a seal from the
space in which the LP-gas container and its fittings are located.
2. Remote (outside) fitting connections shall be used.
3. The container space shall be vented to the outside.
CAUTION: Unsafe use of converted mobile radio equipment for portable
applications:
Motorola two-way radio products that have been designed for mobile operation
should not be used as battery-operated portable units. In such use, there is the
danger that the user or other persons will be exposed to excessive radio
frequency energy levels. This warning applies to all two-way radio equipment
radiating in excess of seven (7) watts RF power. Motorola strongly recommends
that any product that converts high-power equipment for portable operation not
be used.
Installation Planning and Procedures
Testing and Maintenance
Your MaxTrac radio is completely adjusted, tested, and inspected before
shipment. However, FCC regulations state that a station license must be obtained
for each radio installation (radio or base) by the owner of the equipment. The
station licensee is responsible for ensuring the transmitter power, frequency, and
deviation are within the limits permitted under the station license.
No technician’s license is required for installing and maintaining radio equipment.
However, the frequency and deviation of the transmitter must be checked on
installation and at least once yearly.
Power Protection Circuitry
The radio you are installing has been tested for proper transmitter power output
before leaving the factory. Each radio is set to the proper output power level while
connected to an accurate 50-ohm load impedance. Once the power level has
been set, the internal power control/protection circuitry will reduce the power
output whenever it senses a load impedance significantly different from 50 ohms.
This protection circuitry significantly enhances the radio’s reliability with minimal
performance degradation.
If you check transmitter output power levels during installation, be sure you are
using a good 50-ohm load, with a minimum of adapters and using short test
cables. Any load variation from 50 ohms may cause an apparent reduction in
output power due to the normal operation of the control/protection circuitry.
These variations in power with other than 50-ohm load impedance will be most
pronounced in the Other bands since cables, meters,
connectors, etc. have larger effects in other bands. However, the factors are still
significant at UHF and considerable care should be exercised at these
frequencies. If output power seems to be unusually low (greater than can be
explained by the normal calibration differences you experience), check your test
setup. If output power goes up as you improve the quality of the load impedance
(be sure to de-key when making any changes in load), the control/protection
circuitry is performing normally.
Typical mismatches in the load impedance (greater than 1.2:1 VSWR [voltage
standing-wave ratio]) may result in a 10-20% variation in the actual measured
power output. Within these limits, the radio operates normally, and you should not
attempt to service it.
Installation Planning – Mobile Radios / Installation Planning – Base Control Stations /
Recommended Tools for Installation / Antenna Mounting
Planning is the key to fast, easy radio installation. Before a hole is drilled or a wire
is run, inspect the vehicle and determine how and where you intend to mount the
antenna, radio, and accessories. Plan wire and cable runs to provide maximum
protection from pinching, crushing, and overheating.
Installation Planning - Base Control Stations
The base/control station option provides the radio with a desk microphone and
power supply for use at a fixed location. All operations are the same as the radio,
except for the desk microphone.
Choose a location for your base/control station as close as possible to where the
antenna cable enters the building. Be sure 117Vac, 60Hz power is available.
Make sure sufficient air can flow around the radio to permit adequate cooling.
Recommended Tools for Installation
The following tools are recommended for proper installation of your new radio.
• Portable Drill
•HAMMER
Antenna Mounting
The best mounting location for the antenna is in the center of a large, flat
conductive surface. In almost all vehicles, these requirements are best satisfied
by mounting the antenna at the center of the roof. Some vehicles have a large
trunk lid that provides a good antenna location. If the trunk lid is used, connect
grounding straps between the trunk lid and vehicle chassis to insure the trunk lid
is at chassis ground. See the instruction manual supplied with the antenna for
complete installation information.
Radio Mounting
Be sure the mounting surface is able to adequately support
the weight of the radio. Allow sufficient space around the radio for free air flow for
cooling. Be sure the unit is close enough to the vehicle operator to permit easy
access to operating controls. Although the trunnion can be mounted to a plastic
dashboard, it is recommended that the mounting screws be located so they
penetrate the supporting metal frame of the dashboard.
Floor Mount
A floor-mount wedge is available which allows the radio to be tilted at either 45 or
60 degrees. The sleeve-mounting hardware, which is standard with
mates with this wedge.
Extra-Stability Mounting Tray
The optional extra-stability mounting tray is used in conjunction with the nonlocking trunnion. If the radio is mounted on a rounded surface, you may need to
supply and install shim washers (not provided) between the bracket and the
mounting surface. Shims are necessary to tilt the radio because the heavy-duty
bracket blocks the standard trunnion adjustments. Follow instructions provided
with the option.
maximum stability.
Locking Trunnion
The optional locking trunnion consists of a two-piece, trunnion-type mounting
bracket equipped with a key lock and associated mounting screws and is designed
to facilitate easy removal. The locking trunnion may be mounted on either metal or
plastic surfaces, provided the mounting surface adequately supports the weight of
the radio. Follow instructions provided with the option.
Before attempting to install the locking trunnion, examine the vehicle for suitable
mounting locations. This bracket requires a flat mounting surface, 8" x 2"
minimum with adequate clearance for inserting the radio. The chosen location
should be convenient to the vehicle operator and provide access to the power and
the antenna connectors. Be careful to choose a location that permits the locking
trunnion to be removed from the mounting bracket. Vehicle operation should
never be impaired by the location of the trunnion or radio.
Note: Overhead mounting is not recommended.
Check out these video's
Let me know what you think!
BE NICE!
01/41
Signing up means you're interested and want to join gmrs community the general Mobile Radio Service
We would love to have more friends join our conversations on our repeaters and our Network hubs the scattered across the great country of ours FIND US!
Open today | 09:00 am – 05:00 pm |
Copyright © 2023 CaliforniaGMRSNetwork - All Rights Reserved.
Powered by GoDaddy