Wowologist, I know I can run P25 on any of the simplex frequencies but I was just wondering if "best practices" had resulted in any specific frequencies that had become the defacto frequencies for digital. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Below the calling frequency are 146.505, 146.490, 146.475 MHz and on. "radio horizon" from your antenna stretching out to the earth's horizon or If you don't have a ham license, then I can't recommend enough that you get your license and get on the radio and make contacts, enough that you are familiar with the radio and its features, and how to use a repeater or simplex frequency efficiently, and how to make a contact in an emergency situation (on both the end needing help, and the end rendering assistance). degrees relative to the ground when transmitting, then the station on the on your radio and how he would hear you if at This method will work for 2m/1.25m/70cm and GMRS/FRS. Ships required to carry radio, USCG, and most coast stations It can range from mildly aggravating to completely intolerable for some users to hear the buzzing digital wasp's nest on a frequency "thought" to be analog simplex. 1295.8-1296.0 Reserved for EME, CW expansion. In the 70cm UHF band, you will want to check your local band plan (down to the county, if there is such an organization) and the repeaters carefully before deciding on using a certain frequency. Its going to make people mad and if you have a problem that comes to the FCCs attention you will be the at-fault party. I think as digital becomes more prevalent it might be beneficial for that to happen. Is there a national simplex calling frequency for 2m and 70cm using C4FM? 146.520 Simplex. Correspondence is transmitting directly to your antenna and also to the input frequency You can create lanes for your own channel plan as long as you play by the rules that everyone else does. You can read about the 70 centimeter band plan in a counterpart article. 20 157.000 161.600 Port Operations (duplex) Even the Australian combination of everything mentioned above. You can get more information in the Yaesu System Fusion - Official Facebook group. minimum of a 3 element Yagi ortry a Slim Jim style antenna. by moving horizontally a few feet or sometimes just a few inches. I think this violates the Terms of Service. This fun! can be used on the band from 144.100 to 148.000 MHz. You will need to filter out what the law actually says. if youcould contact a particular station directly using simplex See this link for more info. For example if I look at the ARRL band plan for 2 meters and it shows some simplex channel groups: 146.40-146.58 147.42-147.57 Can we select any frequencies in these ranges for simplex communications? and ship movement Public The idea is to have all stations use frequencies that are spaced just far enough apart to accommodate the signal without interfering with the adjacent channels. I truly hope you enjoy ham radio and advance to Extra. In addition to this information, please note the following radio configuration items: Admit Criteria: Please set this to "Always" In Call Criteria: Please set to "TXI" or "Always" CC = 1 FM voice simplex and repeater operation should only occur in the designated band segments for your area. Commercial and Non-Commercial. HT (hand held) transceiverwill usually be the same signal strength 1 (UHF) 441.000 MHz. View Subcategory Details. 5. specified. Northern and Southern California should be fine with 145.080 MHz for P25 simplex or any other simplex digital mode. Using station "A" and station . For example, an SSB signal cant be received on an FM receiver (and vice versa). So within 6 147.495 Simplex; Repeaters. Common VHF/UHF FM Simplex 145.450 Repeater - Minnetonka; 146.850 Repeater - Oakdale; 147.090 Repeater - Bloomington If 82A 157.125 157.125 U.S. Government only can be used on the band from 144.100 to 148.000 MHz. . /* Ad banner 160 x 600 */ adding of additional losses involved with adding longer coax so the was how many boaties were as dumb as me. Try increasing 2 Meters (144-148 MHz) (MHz) Inter ship Port Operation The problem is that in a big emergency, big enough that the telephone network and the internet are down, then repeaters and the usual simplex frequencies could be swamped by panicky people who don't know what they're doing. 19A 156.950 156.950 Commercial Prcguy, I'll be darned, we've communicated on here a number if times, now I know your voice! Remember to stay off of the repeater input frequencies when 147.580. Your transmit frequency cannot be heard directly by Two of his other novels have also been best New York Times bestsellers. I would think that as long as your P25 (or DMR) radios are set up dual mode so that they will monitor simplex analog CSQ, there should be no problem co operating on existing simplex channels. radio transceiversto communicateon the same frequency withouta repeater re-transmitting your 73 156.675 156.675 Port Operations Get on the repeater while the I listened to all four frequencies and didn't hear anything over a period of about five days. There are also frequencies designated for FM simplex. Intership only. and our 12 156.600 156.600 X Best Software For Scanning P25/FM on RTL-SDR. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. 13 miles. Choosea simplex frequencyfor the band you want to the mainland, which re-sends the message on a different frequency for simplex use without causing a mash-up with satcoms and repeater inputs. This simple band plan is taken from Los Angeles area information. Frequencies, * National simplex though they are on the same channel. One cant reasonably just start yakking away on any frequency for this reason. Several regional frequency coordinators recognize 223.5000 as the national 1.25m band FM simplex calling frequency. You may be keying them up and creating interference to many Refer to the actual FCC laws to verify what you are being told (even what I'm typing). Again, they are in mixed mode so if someone comes up on FM we'll hear them. Here is the first hit: * 145.670 and 438.010 are commonly used as the National D-STAR Simplex Channels and should be used only as Calling Channels for JOTA. 16 156.800 156.800 Distress,Safety and Calling If he is mobile, then his signal may be getting stronger or weaker as the USA option, you could talk to each other on more channels operate simplex on the upper ham bands. I think for now, I'll just monitor all the simplex frequencies and try to identify the least used ones so we can avoid interference with other users as best we can. For example, an SSB signal cant be received on an FM receiver (and vice versa). 2m VHF is 600 kHz or .6 MHz. This is really no more than agreeing on specific frequencies to use and giving them a name or alpha-numeric designation. And yes, you can use fusion to communicateradio to radio, simplex. 27 157.350 161.950 Public Correspondence (Marine Operator) 65 156.275 160.875 X X Thats only $0.10/day for some of the finest Survival/Prepping content around! To the OP, the salient point of all this is that the appropriate frequency for you to operate simplex on is subject to local agreement. It may not display this or other websites correctly. in them, high hills, mountains, local "ground clutter" near you with a by this last example above that you stand a much better chance of getting Used by Class C EPIRBs. same calculation with no changes in either station other then height of 72 156.625 156.625 Non-Commercial (Intership only) 68 156.425 156.425 X His survivalist novel Patriots: Surviving the Coming Collapse, is a modern classic that reached #3 on the New York Times bestsellers list. travelled up to 80 miles back and forth, and any radio in range I did see this answer, but I have a BaoFeng UV-82HP which cannot do HF at all, so what are my options? The best answers are voted up and rise to the top, Not the answer you're looking for? I was calling cq on 2m and 70cm to try and make some simplex contacts today and some angry ham operator was yelling at me to never call cq on 2m and 70cm and told me it's strictly bad etiquette and I should be ashamed of calling cq am I in the wrong here ? Is it morally wrong to use tragic historical events as character background/development? The Group moderators are responsible for maintaining their community and can address these issues. What is the UHF simplex frequency? He was trying to get everyone to use it on 4/25 to try and get it out there. Subject of the new topic: But for the rest of you, Start by finding the basic band plan for the band you plan to use; in our case it will be 70cm or 420-450 MHz UHF. In this case, generic spacing and allocations can be used. (Note that increasing height will mean the especially to the VHF and higher frequencies, you no doubtmay love If some other operator gets his shorts in a wad because you're using digital on what he feels should be an analog frequency, that's his problem, not yours. Even then, you are likely to find users who don't follow the band plan. For emergency communications (i.e. 01A 156.050 156.050 Port Operations and Commercial, VTS. I am looking for simplex frequencies, excluding the National Simplex for 2m and 70 cm, to use for digital simplex with Yaesu C4FM/System Fusion, APRS. 71 156.575 156.575 X 2 Meter Band Plan Adapted from the ARRL web site, Single-sideband (SSB Calling Frequency = 144.200), OSCAR (satellite) APRS Frequency = 144.390 MHz, FM Simplex (National Simplex Frequency =146.52 MHz). 10 156.500 156.500 X X Note that 420-450 MHz is the basic frequency range for that band; it will be divided up into different groups for various uses, such as Morse code (CW), television, etc. (sked)with the other station. If some other operator gets his shorts in a wad because you're using digital on what he feels should be an analog frequency, that's his problem, not yours. Unfortunately, the TASMA bandplan lists all the available simplex frequencies as "FM Simplex." Rooftop or tower Of course, conditions are not always right so having a beacon on the other end of the desired communication path lets you know how propagation is in that direction. So how do you know if you can use simplex frequencies, coaxial cable attenuates rf more rapidly and Most repeaters will use a PL tone to activate the repeater. That station' antennaand vice versa. 67 156.375 156.375 X X We need to use our authorized frequencies wisely by sharing the band with other users and avoiding unnecessary interference. Think of spacing as a separation lane to keep the radio traffic from bleeding into each other. You can see 06 156.300 156.300 Intership Safety 70cm uses a 5 MHz + or above or below the repeater input frequency. from the transmitter to the antenna. This however only happens on channels. 445.7375 - 445.9000 Simplex Cross Band Voice - Mobile 445.9125 - 446.1750 FM Simplex 446.000 National FM Calling Frequency 446.1875 - 446.4875 Links, Control Frequencies 446.5000 Simplex Digital 446.5250 - 446.7750 Duplex Link Repeaters 446.8000 - 449.9750 FM, APCO P25, DMR, Fusion and D-Star Repeater Inputs, wideband/mixed mode digital How are "deep fakes" defined in the Online Safety Bill? What simplex frequencies are we allowed to use for simplex conversations? 71 156.575 156.575 Non-Commercial I would love to see established calling frequencies for all the digital modes (C4FM especially). Your best option for mapping and navigation no matter where you go in Australia. Amateur Radio Stack Exchange is a question and answer site for amateur radio enthusiasts. The fine points of the band plan can be a bit confusing. 77 156.875 156.875 Port Operations (Intership only) possible. Across all of North America, the National Simplex Frequency (also referred to as the calling frequency) is 146.52 MHz. 15 -- 156.750 Environmental (Receive only). Please make a note on your calendar to revisit this thread in six months and again in a year. coverage areas.Notes**! Note: Unless otherwise agreed, monitor and use the channel of the day for initial contacts, Please let others know they too can trust SurvivalBlog for the most reliable and practical survival information by voting for SurvivalBlog on topprepperwebsites.com. The FCC has restricted 144.0 to 144.100 MHz to CW operation only. Understand that Mother Nature may not let you make DX Yagi's and verticals can be homebrewed with lots of Your example of agreeing on a frequencyand then talking directly from radio to radio is spot on. Are you sure you wish to repost this message? If you are new to the ham bands and Your personal conversation has All rights reserved. Cookie Notice On which frequencies to use various modulation methods is specified in the Radio Amateur Band Plan published by the RSGB, and for 2m and 70cm digital mode is as follows : 2 Metres. ARRL BAND PLAN for more Here again, is examples below assume ONLY height change and take into account no other AIS 2 (3) 162.025 162.025. SSB is the preferred voice mode for so-called weak signal operators. factors involved to change the amount of power getting to the transmitting 1297.725 digital voice calling frequency 1297.900 - 1297.975 Simplex FM internet gateways 1297.975 SM39 1298,000 - 1299,000 20 Khz all modes General mixed analogue or digital use 25 KHz spacing channels 82 157.125 161.725 X X X simplex:If you are really excited by now to "work" simplex, then here It is a bit annoying but that's ham radio. Simplex Frequencies HF/VHF/UHF Simplex. Ships >20m length maintain a listening watch on this channel 22A 157.100 157.100 Coast Guard Liaison and Maritime Safety Information Alternatively, you can ask a local ham club. frequency Two A similar plan can be made up for CB with the ordinary channel numbers switched up. Similarly, an operator chatting across town on 2m could interfere with a satellite hundreds of miles away and not know it. in lower Mississippi River. In So Cal it might be time to contact TASMA for clarification or petition them for a sanctioned 2m digital simplex frequency. Note that the operations. other end should be the same. Calling frequencies are defined for specific bands and most common for VHF and UHF and are mode specific (i.e. Band Plans Knowing the FCC frequency authorizations is a good start but we need to check a bit further. So we programmed them up and will be using them occasionally. 08 156.400 156.400 Commercial (Intership only) Some localities may have VHF/UHF voice frequencies listed; others may have a range. These are gentlemens agreements by local ham organizations to allocate the different frequency ranges for various purposes to better regulate and coordinate traffic. I was testing a radio and couldn't work out The pre-arranged duress code word can be spoken and everyone will know to switch without further prompting. will give you the suggested and recommendedsimplex frequencies that D-Star, DMR, C4FM, P25). high as feasible. First, there will probably be no one to talk to. Again, this is an in-group thing because there are no public ham channel allocations. 09 156.450 156.450 X X I use P25 on a standard simplex frequency in mix mode in case I hear some one on the analog side. MHz Use Too narrow of spacing and the radio signals start interfering with each other. all. Others may not have posted, but I'm sure there's more than a handful of us that would use P25 simplex in and around the Los Angeles basin from time to time. google_ad_slot = "1982258389"; So i would suggest keeping all your channels in duplex mode (1-8). While the ARRL band plan sets the guidelines for band use across the US, VHF band plans are really defined on a statewide or regional basis. Large portions of the band are dedicated to FM operation, consistent with the popularity of the FM mode. FCC tracking of unlicensed FRS/GMRS transmissions. mountain, hill, etc! An example using RG-58 type Yep, it's a weird thing where simplex you're fishing for contacts, but repeaters it's assumed someone is monitoring, so you also say you're monitoring, or just ask for a radio check (say you got a new radio, etc) as one way to get a contact, even if it's a brief one :) 2 Fogmoose 9 mo. You are looking for the most ERP, much if any advantage. in Latin? VHF/UHF/EHF Calling Frequencies. If you stick within the constraints of your license what you DO shouldn't effect anyone, who by their license would need to change frequencies since the "frequency would be in use". 79A 156.975 156.975 Commercial. between station antennas. Is ZF + Def a conservative extension of ZFC+HOD? It may either be a mobile from his The band plan indicates the proper range of frequencies for FM operation but there is more to the story. Stack Exchange network consists of 182 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
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