howto:xband
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howto:xband [2019/08/02 19:09] – [Crossband Repeater] ve7hzf | howto:xband [2021/10/07 19:54] – va7fi | ||
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* Where as a regular repeater always listens to the same frequency (the input of the repeater) and always transmits on the other (the output), a crossband repeater transmits on one frequency whatever it hears on the other, whichever it hears first. | * Where as a regular repeater always listens to the same frequency (the input of the repeater) and always transmits on the other (the output), a crossband repeater transmits on one frequency whatever it hears on the other, whichever it hears first. | ||
- | + | Many higher end dualband radios are capable of doing cross-band repeat (Icom' | |
- | Below are different uses for a crossband repeater. | + | |
===== Adhoc Repeater ===== | ===== Adhoc Repeater ===== | ||
- | Supposing you are in a remote location with no repeater and you have a few people who need to communicate with handheld radios. | + | Supposing you are in a remote location with no repeater and you have a few people who need to communicate with handheld radios. |
- | {{ :howto: | + | {{ howto:xband: |
* Both handhelds are set to listen to 446.100 and transmit on 145.565 so that when Unit A transmits on 145.565, | * Both handhelds are set to listen to 446.100 and transmit on 145.565 so that when Unit A transmits on 145.565, | ||
* The crossband repeater hears the 145.565 signal and re-transmits it on 446.100 | * The crossband repeater hears the 145.565 signal and re-transmits it on 446.100 | ||
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There' | There' | ||
- | {{ :howto: | + | {{ howto:xband: |
* Here, each handheld uses a different band so there is no need for fancy dual band tx/rx. | * Here, each handheld uses a different band so there is no need for fancy dual band tx/rx. | ||
* The problem is that you can't add more handhelds (unless they can already hear the others in simplex). | * The problem is that you can't add more handhelds (unless they can already hear the others in simplex). | ||
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This is a scheme I use often at home with my base station in crossband mode: I tune one receiver to our local repeater, and the other to a simplex UHF frequency. | This is a scheme I use often at home with my base station in crossband mode: I tune one receiver to our local repeater, and the other to a simplex UHF frequency. | ||
- | {{ :howto: | + | {{ howto:xband: |
* Unit A transmits and receives on 446.100 (with a tone). | * Unit A transmits and receives on 446.100 (with a tone). | ||
* The crossband repeater hears 446.100 (with a tone squelch) and re-transmits it on 147.**8**20 (the input of the repeater). | * The crossband repeater hears 446.100 (with a tone squelch) and re-transmits it on 147.**8**20 (the input of the repeater). | ||
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All that is needed to " | All that is needed to " | ||
+ | <WRAP center round important 90%> | ||
+ | One thing to keep in mind with crossband repeat is that the radio doing the repeating is transmitting every time someone transmits. | ||
+ | </ | ||
+ | |||
===== Repeater Extender Variation===== | ===== Repeater Extender Variation===== | ||
- | One thing to keep in mind with crossband repeat is that the radio doing the repeating is transmitting every time someone transmits. | + | The following is a variation I use when I can hear the repeater with my handheld, but can't transmit to it because of the handheld' |
- | {{ :howto: | + | {{ howto:xband: |
The crossband repeater is set up with the input frequency of the repeater without the offset. | The crossband repeater is set up with the input frequency of the repeater without the offset. | ||
- | * Unit A transmits | + | * Unit A transmits on 446.100 |
* The crossband repeater hears 446.100 and re-transmits it on 147.**8**20 (the input of the repeater). | * The crossband repeater hears 446.100 and re-transmits it on 147.**8**20 (the input of the repeater). | ||
* The repeater hears 147.**8**20 and repeats it on 147.**2**20 (its output) | * The repeater hears 147.**8**20 and repeats it on 147.**2**20 (its output) | ||
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A crossband repeater can be used to link a VHF and UHF repeater simply by dialing both repeater frequencies (with offset and tones) on the crossband repeater. | A crossband repeater can be used to link a VHF and UHF repeater simply by dialing both repeater frequencies (with offset and tones) on the crossband repeater. | ||
- | {{ :howto: | + | {{ howto:xband:xband3.png |}} |
+ | |||
+ | <WRAP center round important 90%> | ||
+ | Here again, high transmit duty cycle can be an issue. | ||
+ | </ | ||
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To reach Unit A, Unit C would need to " | To reach Unit A, Unit C would need to " | ||
- | {{ :howto: | + | {{ howto:xband: |
- | ===== Note ===== | + | ===== KT-8900 |
- | The first draft of this page was copied over from [[https://ptruchon.pagekite.me |VE7HZF' | + | It's pretty easy to setup a cross band repeater with two KT-8900 radios. |
+ | {{ howto: | ||
+ | * The first step is to make an ethernet patch cord with this {{howto:xband: | ||
+ | <WRAP indent> | ||
+ | |1 (Data Input) | < | ||
+ | |2 (RPT CTRL) | ||
+ | |3 (MIC) | < | ||
+ | |4 (MIC GND) | < | ||
+ | |5 (PTT) | < | ||
+ | |6 (GND) | < | ||
+ | |7 (+8VDC OUT) | < | ||
+ | |8 (AF OUT) | ||
+ | </WRAP> | ||
+ | * The second step is to set the menu option 43: '' | ||
+ | * For my setup: | ||
+ | * I set the UHF radio to low power because it' | ||
+ | * I set the VHF radio to high power because this radio would need to reach a repeater further away. It will also only transmit when I'm speaking | ||
+ | * Once both radios are on their correct frequencies (one must be on UHF and the other on VHF), connect the cable to link them both. |
howto/xband.txt · Last modified: 2021/10/07 19:55 by va7fi