The results are in. Most radio systems today use repeaters located on top of buildings, towers or on hill tops. Here is how it works: Let's say we want to build a repeater to operate on 147.32+ on 2 meters, and we will use 445.1 as the 440 band simplex frequency. Each manufacturer implements the cross-band repeater a little different, so you'll need to know how to turn it on and off. This "link" radio need not be duplex because of the way the link and repeaters are configured. This link is listed in our web site directory since Wednesday Oct 7 2009, and till today "How to build a VHF repeater" has been followed for a total of 2625 times.So far received 14 votes for a total score of 4.87/10 I oriented the antenna to the compass accurately and looked up the heading to the repeater. I'll be using a pair of TYT TH-9000D 220MHz transceivers and an Arcom RC210 controller. You can use the program by visiting the site and creating an account. For the feed point, use yet another piece of PVC pipe, drilling a hole through the center to provide for a strain relief for the feedline. On the 2 meter ham band these frequencies are 600 kHz (or 600 kilohertz) apart. July 9, 2015. Build the Reflector first, make it 40 long. One for it's transmit frequency and another for it's receive frequency. Finding a prime spot is essential. A repeater receives a signal and re-transmits it, usually with higher power and from a better location, to provide a greater communications range. The complete construction process of a 440MHz UHF Amateur Radio Repeater that was setup on top of our school here at New Mexico Tech. Find the middle of the length, drill and tap a hole for a 6-32 screw. As a general rule in the USA, if the output frequency (transmit) of the repeater is below 147 MHz then the input frequency (listening) is 600 kHz lower. amateur radio band. Thanks to Scott from Argent Data for contributing an ADS-SR1 to make this video possible. It is easily received by most scanners. . But basically, you'll dial a VHF memory channel on the primary VFO side of the radio and a UHF simplex memory channel on . 145.130 (-600) PL tone 131.8 set at about 45 watts Load it in the back of a vehicle and haul it to where ever it is needed, hook it up to a 12 volt battery, plug in the Antenna and it is on the air. Update: I replaced the Micor withe the GE Mastr II Sept. 2017. Here's a portable VHF repeater I built from two Bendix King LPH portables for 2 meter amateur radio operation, I ran it at just 2 watts but had clear continuous coverage over a hilled wooded area. Basically a simplex radio (old hand held or mobile rig) is connected to a repeater that you want linked to another. Below is the checklist of components required to construct a 2 meter vertical antenna: 3/4 PVC pipe-- Length to suit 3/4 adapter 8xMPT 3/4 THD Dome Cap SO-239 port 6ft. You'll lose a lot of signal if you run a 2 meter antenna horizontal. In order to listen and transmit at the same time, repeaters use two different frequencies. About 2 inches (5.1 cm) from the end gives you a good spacing for the insulators. a ground plane will often have three or four . In order to listen and transmit at the same time, repeaters use two different frequencies. The Driven Element will be ~5% shorter than the Reflector or 38 long. If a However, there is no limit to the number of Zigbee devices that may be added when signal repeaters are used. Horizontal is only used (on 2m) for ssb/cw on the low end of the band, very little activity there (virtually none). output: 145.100 to 145.500 MHz input: 144.500 to 144.900 MHz . On HF it doesn't matter so much but on 2-meters it does. 10 dB SuperStationmaster Antenna (shipping included): $800. The difference between the Interface and a regular cable in a "box" between the two ends. First step in using cross-band repeat is to read and understand your radio's operation manual. Looking to the north, I can see for miles and reaching 2 meter repeaters at 40+ miles is easy enough with my copper J-Pole mounted at 20 ft, but I have yet to get across Saginaw Bay. Radio Mobile is a free and powerful computer-aided tool witten by Roger Coud VE2DBE. Referring to the pictures in this article will convince most people that the frame was easy to build, using 3/4 inch PVC, while keeping dimensions as close as . N7NEW 2 Meter VHF Portable Repeater Used for Emergency Repeater or Event Repeater This is a completely self contained Emergency Repeater. This seems to provide a much quieter receiver than the newer . Note that this list only includes repeaters that have been registered with the WNYSORC by the club or Ham Radio Operator that operates it (so some that can be heard in this area may be missing from the list). 2 Enter repeaters. ost commercial 2-meter repeater antennas with gain fall into two categories: collinear arrays and stacked element arrays, with gains ranging from 3 to 9 dB1. 2 meter band. It's free to amateur radio operators. The Mastr II is a 110 watt repeater set to 60 watts output. This is referred to as a negative offset. The link (remote base) radio will need to be on the same Band, Frequency, Split, and PL as the repeater you are linking to. lastHopLqi or Link Quality Indicator(A) - is an unsigned . 146.610 to 147.000 146.010 to 146.400 The repeater is a GE Mastr, but the Micor just won't quit. The primary focus of ham radio operation on this band is using FM (frequency modulation). Includes conceptual explanation, construction, testing, and. Often located atop a tall building or high mountain, VHF and UHF repeaters greatly extend the operating range of amateurs using mobile and hand-held transceivers. Ground plane antennas are easy to recognize by their appearance. REPEATERS. The unit requires crystals to set the frequencies. Assuming you're looking at a more or less "plug and play" solution, a basic ready-made ham repeater is going to run around $1000 minimum for a relatively low-power repeater with decent quality and reliability. Again, find the center of the length, drill and tap a hole for a 6-32 screw. Start with a good used commercial repeater, like a GE Mastr II: $1,500. Ham Radio Repeater "The complete construction process of a 440MHz UHF Amateur Radio Repeater that was setup on top of our school here at New Mexico Tech. 9.45 dBi equates to 9.45 - 2.15 = a whopping 7.3 dbd gain with over 20db front to back ratio and a 2:1 swr bandwidth . ABOVE: Repeater Interface Trial #2: I purchased a "Repeater Interface" off of eBay. Approximately 13 feet of element stock will be required. The first step in this project was adding a DE-9 serial port to each of the radios. On other bands, the offsets are different. The main category is Radio Repeaters that is about Radio Repeaters. Title: A Homemade Duplexer for 2-Meter Repeaters Author: epb Created Date: 3/2/2001 8:35:26 AM GaAs FET Preamp: $100. More info here: http://blog.thelifeofkenneth.com/2016/01/building-s. 3. Rig B is set to 147.92 simplex (the 2 meter receive frequency) and 445.1 simplex on the 440 band. It is used to plot antenna patterns and to predict the performance of radio systems from 20 MHz to 20 GHz. Finally, I made arrangements with Fred, AB1OC to do some testing later that afternoon. Rig A is set to 147.32 simplex (the 2 meter transmit frequency) and 445.1 simplex on 440 band. All the frequencies used in repeater must not be used more than once. 4-cavity duplexer, like a WACOM or Tx/Rx: $600. Zigbee Mesh.Hubitat Elevation supports up to 32 Zigbee end devices, in other words, devices paired directly to the hub, without a repeater in place. You can highlight your store locations with custom colors and elements. Drill 12 inch (1.3 cm) holes using a good drill bit, and never drill close to the end of the pipe. Find The Right Position Different Types of Radio Repeaters 2 Important Functions Of a Radio Repeater Regenerate a broadcast signal Improve the performance Conclusion What is a Radio Repeater We'll use the walkie-talkie as an example. In addition, most who use this band do it in the area of the band set aside for repeater operations and it is very popular with new hams holding a Technician license! He takes you step-by-step through the design, construction, and use phases of this simple antenna. Today we're going to build a simple ground plane for the VHF 2 meter band. Set the transmitter on the repeater input frequency and connect P and Q. For 2 meter FM operations, local amateur radio operators use a radio repeater, a transmitter, and a radio receiver that instantly resends a received signal at a different frequency. The repeater is online and serves Socorro at a frequency of 442.125 (+) 100.0 PL 73, Skyler Fennell KD0WHB" to nearest $100 (2m would cost slightly more due to cost of duplexer). The Zigbee logs show you information about the health of your Zigbee network. This week I started work on the 220MHz Repeater. I think it's convention in the 70cm to have the matching frequency-transposed outgoing channel 5 MHz from the receive . The 3 element 2 meter (designed for 146mhz) quad in this project has a very small footprint (boom length) of about 32 1/4 inches and according to the computer guru's out there, it has about 9.45dBi gain with only three elements. (About 10 to 11 minutes each) Part 1 - Getting started on 2M FM (Repeater Basics) Part 2 - Getting started on 2M FM (Basic operation of a 2 meter HT) Part 3 {Direct from YouTube} - Getting started on 2M FM (Basic Programming of a 2 Meter HT) The Basic Repeater Components: Antenna Most repeaters use only one antenna. The new A144S10 10 element 2 meter Yagi is around 28 feet and the Diamond X200A is around 20 feet high at the feed point. Conducting a radio coverage site survey and finding the right installation location is one of the most important steps in setting up a radio repeater. How to Build a Radio Repeater: 2 Essential Steps 1. Used Yaesu 2 Meter Repeater & Celwave Duplexer The Yaesu FTR2410-A is a Two Meter (144 - 174 MHz) amateur radio service repeater. Ideally, you want all the receiving frequencies to be in a continuous frequency range, and the transmitting ones in a separate one. Give users the ability to create and share their own custom maps and use zoom, pinch, rotate, and tilt to explore maps in more detail. The antenna is small enough to fit into your emergency "go kit" or for use as a standby 2 meter antenna at your home station. Duplexers are the devices that allow a mobile telephone to operate like a wired telephone, with either or both people speaking at any time without using a microphone switch to enable the radio transmitters. Positioning of the antenna is critical to the overall success of the radio communication that is depending on the repeater. Decide upon which frequencies you want to listen, and on which your repeater will transmit. Luckily this was very easy because not only is there already a DE-9 cutout on the rear of . 1.Customize your maps Style your maps with custom markers, lines, colors, polygons, and images. Insert a cavity with shunt capacitors in place between P and Q and adjust the cavity tuning for minimum reading on the VTVM. Then you have to buy a quality duplexer, which at VHF is going to cost close to $1000. The repeater is an ECHO link repeater and has a frequency agile remote base on 440 and 220. This repeater interface contains the same cable - 3.5mm on each end along with a 2.5mm adapter. Due to the constant static the transmit radio would "time out". 14 GA Romex cable This element is 1/4 wavelength long, or about 19 inches for the 2 meter band. Well, all the repeaters and mobiles and most bases on 2-meters are vertical polarization. The picture below programs the products you will certainly need to develop a 2 meter 1/4 wave vertical antenna for the 146 mHz. Next up are the ground radials. On the 2 meter ham band these frequencies are 600 kHz apart. A 2-Meter Vertical Dipole Array Build this 2 or 4-Element VHF repeater antenna with up to 9.7 dBi gain and 18 Vertical Beamwidth. The Hex Beam is 33 feet up. About How to build a VHF repeater The resource is currently listed in dxzone.com in a single category. First off you'll notice the radiating element. Repeater station is usually located on high ground, such as a hilltop or a high-rise building, where terrain extensions can be seen. Includes conceptual explanation, construction, testing, and more. The 2 meter band covers from 144 to 148 mHz. Obtain a reading between 1 and 3 volts on the VTVM. The gray area is usable mobile, but you need to stop your vehicle. Also explains how a repeater works. Getting started with ham radio repeaters, how to set your radio to communicate and how to use a repeater. Output power is 10 watts and is currently set up to transmit on 145.380 MHz and receive on 144.780 MHz. 4. Randy Hall (K7AGE) does an excellent job of explaining the theory and operation of this simple vertical antenna. Repeater Site Survey 2. RM lacks easy to understand documentation. 5.