howto:xband
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howto:xband [2019/02/13 19:17] – created ve7hzf | howto:xband [2021/07/09 20:54] – va7fi | ||
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A crossband repeater is different from a regular repeater in two important ways: | A crossband repeater is different from a regular repeater in two important ways: | ||
- | * Where as a regular repeater uses the same band with a small offset between the tx and rx frequencies (600kHz | + | * Where as a regular repeater uses the same band with a small offset between the tx and rx frequencies (600 kHz for VHF and 5 MHz for UHF), a crossband repeater uses two frequencies on different bands (one on VHF and the other on UHF for example). |
- | * Where as a regular repeater always listens | + | * Where as a regular repeater always listens |
- | + | 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 | + | * Both handhelds are set to listen |
* 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 | ||
* Which Unit B hears, and vice versa. | * Which Unit B hears, and vice versa. | ||
- | In practice, it might be tricky to setup the handhelds to receive one band and transmit on the other. | + | In practice, it might be tricky to setup the handhelds to receive |
==== Adhoc Repeater Variation ==== | ==== Adhoc Repeater Variation ==== | ||
- | 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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===== Repeater Extender ===== | ===== Repeater Extender ===== | ||
- | This is a scheme I use often at home: I tune my base station to a local repeater, and add a crossband on a UHF simplex frequency. | + | This is a scheme I use often at home with my base station |
- | {{ :howto: | + | {{ howto:xband: |
- | * Unit A transmits and receives on 446.100 | + | * Unit A transmits and receives 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 |
* The repeater hears 147.**8**20 and repeaters it on 147.**2**20 (its output) | * The repeater hears 147.**8**20 and repeaters it on 147.**2**20 (its output) | ||
* Unit B receives 147.**2**20 and replies on 147.**8**20, | * Unit B receives 147.**2**20 and replies on 147.**8**20, | ||
* The repeater re-transmits on 147.**2**20 | * The repeater re-transmits on 147.**2**20 | ||
- | * The crossband repeater hears 147.**2**20 and re-transmits it on 446.100 | + | * The crossband repeater hears 147.**2**20 and re-transmits it on 446.100. |
- | 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 on and receives on 446.100 | + | * 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: |
+ | ===== KT-8900 ===== | ||
+ | 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: | ||
+ | <WRAP indent> | ||
+ | |1 (Data Input) | < | ||
+ | |2 (RPT CTRL) | ||
+ | |3 (MIC) | < | ||
+ | |4 (MIC GND) | < | ||
+ | |5 (PTT) | < | ||
+ | |6 (GND) | < | ||
+ | |7 (+8VDC OUT) | < | ||
+ | |8 (AF OUT) | ||
+ | </ | ||
+ | * The second step is to set the menu option 43: '' | ||
+ | * For my setup: | ||
+ | * I set the UHF radio to low power because it's ether going to be used on a UHF simplex frequency when I'm around the house, or by VE7SCK, which is also really close. | ||
+ | * 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 on the UHF simplex frequency or when someone is using VE7SCK, which is less often. | ||
+ | * 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