Cross-banding. Crossband Repeating
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- Brook Preston
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1 Crossband Repeating Crossband Repeating is a process where a Ham transmits one signal on one band (typically UHF), and it is received by another radio with a better antenna/power installation, and re-transmitted (typically on VHF) to another radio system, or a repeater. Everyday examples of cross-band repeaters are repeater receive sites that hear the input signals on 2m and retransmit those signals on a frequency higher than 220 MHz. When is it a good time to crossband repeat? Anytime that you are using an HT, and cannot be heard into the repeater system, or when you are working an extended event, and do not want to exhaust your HT's batteries. With two crossband repeaters, it is also possible to also build a temporary portable repeater. The radios that I used for this example are Alinco dualband VHF/UHF mobiles, and Alinco dualband VHF/UHF HT's. Other equipment may be used, but important things to look for are: tone squelch, split sides, split tones, remote control, and crossband capable. Not all dualband radios support crossband operation. If possible, ask for a demonstration before purchase, as some radios claim to support it, but require someone holding the microphone over the radio's speaker. For the purpose of this article, I assume you wish to crossband into a 2m repeater. By adjusting the settings, you may crossband into 440 or other frequencies. It all depends on your equipment. NEVER CROSSBAND REPEAT TWO REPEATERS TOGETHER!! By doing so, you run the risk of a signal loop, causing both repeaters to remain up, and rendering the systems useless. Repeaters tend to have squelch tails on them, and that tail will key up the other repeater that will cause a tail that will key up the first repeater, and so forth! What is tone squelch? Tone Squelch, sometimes called Tone Decode, is a setting on a radio that will prevent the frequency from opening unless a proper PL tone is received on the audio signal. Repeaters, such as the , require a PL tone in order to use the repeater. The hardware on the repeater has a tone squelch set for Because your crossband repeater will be a temporary part of the repeater system, you need to protect the repeater by investing in a tone squelch. Otherwise, any random noise (static crunches, intermod) will enter your system, and cause headaches for other users on the system. Tone Squelch is strongly urged. 1 / 6
2 What about remote control? Some crossband mobiles, such as the Alinco 610, or the "cool blue" Kenwood support limited remote control of the radios. This is handy for remotely shutting off your crossband repeater with your HT. Be aware though, that the commands should not be transmitted through the "live" side of your station, as those tones will also be sent to the repeater. In order to effectively use remote control, you need to transmit "backwards". I will explain more later as we discuss the types of crossband repeating. What are split sides? I refer to radios as "split sides" (some call it split frequencies) if they are dual band radios (mobile or HT) that can transmit on VHF and receive on UHF (or vice-versa) on the same "side" of the radio. For example, a typical radio has a frequency on the left side, and another frequency on the right side. Some radios will allow you to program a VHF frequency on one side, and create a split so that the same side can transmit in the other band. For example, I can with my Alinco program receive and TX on the left side, and the right side may be programmed to RX / TX. Split sides really increase the power of your transceiver. What are split tones? Some radios allow you to set a transmitting PL tone of X, and a tone squelch of Y. For example, my Alinco can transmit a PL tone of 127.3, but be configured for a different tone squelch of I have found that some radios that support split tones will not do them during crossband repeating. Be sure to test. Any other concerns? Yes. Be sure to have a larger battery for the mobile radio, as it may be utilized greatly during your session. Also make sure it is properly cooled, so it does not overheat. Also, some radios may not allow transmitting from 2m to 440. I think I heard about one of Kenwood's models not working properly as illustrated below. Types of Crossbanding There are two types of crossbanding- half duplex and full duplex. Full duplex means that the crossband repeater manages both "sides" of the conversation through to the repeater, whereas half duplex means that only your "side" of the conversation is re-transmitted. Half Duplex 2 / 6
3 The easiest setup for crossband repeating is half duplex. Consider the diagram below: Using half duplex, the HT is set to transmit on a private UHF simplex frequency to the mobile radio. The mobile receives the signal, and re-transmits it into the repeater. When the HT is done transmitting, the mobile radio falls quiet, and the HT hears other people directly on the repeater. How to setup this scenario: * Setup your HT to transmit on UHF (let's say ) Do not use that frequency... find your own! Set the PL tone of the UHF to something besides let's pick * Setup your HT to receive on If your HT supports crossband transmitting on the same 3 / 6
4 "side", such as my Alinco DJ-G5, use the same side as the UHF setting, and remember to set the proper split. * Setup your mobile radio to transmit on (the input of MAARS), and transmit a tone of Do not, in this case, program in with a (-) offset. You want the simplex in the radio. If your radio supports split tones (Alinco does), set the tone squelch on VHF to something different, say Not all radios can do this, but setting a different tone squelch will prevent others from backfeeding your system. * Setup your mobile radio to receive on UHF simplex (our example, ) and if possible, setup the tone squelch to our sample This will prevent other UHF signals without that tone from using your mobile without your permission. * Place the mobile in crossband repeat. Check the power levels to ensure they are at minimal levels. Now, when you key up your HT, it will transmit on UHF to the mobile. The mobile, hearing the proper signal, and the proper tone, will open, and re-transmit the signal on with a PL of Notes: There are two concerns with this setup. The first is that unless you have a dual squelch on the mobile radio, any other stations talking near your mobile radio will be able to backfeed the link, transmitting back to your HT on UHF. You can get around this by creating a different offset on the crossbanding radio. Program a different frequency, such as or something, and then when the mobile transmitter keys, make sure it ends up on If you don't want to change the default offset, you could program in , and program a positive offset, so that a keyup will be +.6, placing you on the proper frequency. The second concern is that your HT will repeat what you are saying on the VHF side as you talk into the UHF side (remember, when you are talking, so is the repeater, so the HT should hear the repeater too). This can be fixed on some radios by muting the sub-band (the band not transmitting); others, like my Alinco DJ-G5, allow for crossband transmit, so I only use one "side" of the radio for all this. If in doubt, you might end up turning the volume up and down on the VHF side while you are transmitting. Also, use minimal power on the crossbanding mobile. That will save your battery life and keep 4 / 6
5 the heat down. With this setup, it is easy to transmit remote-control commands if you can use split PL tones. If your setup allows for this, program in with your non PL tone, and remote control your mobile radio. If you cannot use split PL tones, meaning your system is toned on all frequencies, your commands may be heard by the repeater, and we request that you manually control your crossband repeater. Full Duplex Full duplex crossband repeating is more difficult to setup, but it does work. If your particular situation allows for half duplex, I strongly suggest that you proceed with that setup. Full duplex places many more demands on your crossband repeater, because it will be working almost 100 percent of the time. Remember, it re-transmits all of the data on the repeater, too! Only use this scenario if your HT is in a location that cannot hear the repeater directly, such as in your basement during severe weather. Consider the following diagram: 5 / 6
6 Using such sent hopefully, hears How tone. private PL rest functionality. are Notes: transmitting operational. radio configuration! Again, UHF repeater's Other With * with choose ( position give then crossband allow monitor simplex time used this * Program If Place Build if If decode your repeater, scenario. period set your the out just to crossbanding signal, side as until cool! Let's it, Ideas other minimal LEFT this This a PL configure transmit two for simplex). mobile our VHF where timer. temporary signal reverse radios duplex, of to the carrier your tone use repeat If is repeater. (some of transmitting. mobile offset scenario crossbanding when such sample This Involving the sends side, a 127.3, first with will output, have does levels. Also transmitting, they minor simplex). will would HT mobile (100.0) radio on support means for signal repeaters, the Choose to also condition call your side program re-transmits radio the technologies, talk to VHF note are of a this When setup. utilizes from features again. violation HT signal we Crossbanding tone be. UHF output let the radio has HT to enabled. penalty) needed, come transmitting, On split or that scenario: Setup transmits should If the radio, your proper drop repeater crossband is squelch PL completed the UHF simplex that A your the back It but if to using tones the (147.00) radio your VHF get a with transmits of on HT the completely RIGHT time-out need will didn't where of program repeater. Program the you first PL to mobile with VHF, wish a VHF into receive to 2 linking on other of command (let's allow for the will fan, FCC SIMPLEX encode minutes, done, give can signal the to repeat 127.3). have the more system, a transmitting. the side, to HT split making repeater's your make not timer, will lot crossband install say radio Mobile cannot you do ) the rules, QSO. remote normal Using on system. before the a to of receive TX "sides" other program mode. private When need radio to VHF one so transmission battery UHF, That with consider mobile, heard one! re-transmitted power. the but monitor Be radio two "hear" that decode received (-) control and reverse your UHF things: output with This the automatic Check signal sure that like repeater Don't the technically PL with You offset simplex) crossbanding by your power, radio the Use standard HT your simplex transmitting tone. repeater the enabling setup 1 to the can UHF a this protection. frequency, HT forget corresponding (a will VHF your radio "wins" the can UHF private also input Alinco gain switches crossbanding HT. proper UHF burn system The is if be radio on to simplex could power transmit. tone illegal, decision. you stronger frequency, provide repeater's has 100 antennas. transmits, them. You (147.60) , mobile input, a out 610 UHF set mobiles, for lot to have 1 private UHF when of be a Move percent to with back levels will the UHF of receive a however. 10 chance frequency, does, In useful simplex additional radio and than UHF set Also cooling. radio frequency need remote other just order your proper a mobile output with system, When the 20 tone setup higher repeated repeater link of you the like note if make mobiles minutes, HT, receives to PL mobile side the to a you frequency, this (100.0). offset recover. control tones, can repeater. wait Keep private frequency, because a with the cooling location, you that time. but traditional HT (let's may have sure (and (with setup VHF), this over first for radio your into will keys can that when with the and It that not PL a they The to up, for one is UHF VHF not do and up be is a 6 / 6
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