Differences

This shows you the differences between two versions of the page.

--- howto:xband [2019/08/02 19:09] – [Crossband Repeater] ve7hzf
+++ howto:xband [2020/10/01 21:31] – 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.
+Many higher end dualband radios are capable of doing cross-band repeat (Icom's ID-5100 or Kenwood's TM-D710G are two examples).  Below are different uses for a crossband repeater.
-Below are different uses for a crossband 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.  You could park your car with a crossband repeater up a hill and use two simplex frequencies as follow:
+Supposing you are in a remote location with no repeater and you have a few people who need to communicate with handheld radios.  You could park your car with a crossband repeater up a hill and use two simplex frequencies as follows:
 {{ :howto:xband1.png?600 |}}
   * Both handhelds are set to listen to 446.100 and transmit on 145.565 so that when Unit A transmits on 145.565,
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 All that is needed to "program" the crossband repeater is to tune it to the regular repeater frequency (with its proper offset and tone), and select a UHF simplex frequency for crossband repeating.  I add a tone and tone squelch to the UHF frequency to limit interference being sent to the repeater from other operators who could join the UHF frequency not realizing it's in use.
+<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.  Using this scheme to listen to an hour long net means that the radio would transmit at close to 100% duty cycle, which it may or may not be designed to do.  It would be best to use the lowest power setting and/or keep the use to a minimum.
+</WRAP>
 ===== 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.  Using the previous scheme to listen to an hour long net means that the radio would work at a very high duty cycle, which it may or may not be designed to do.  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's low power:
+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's low power.  In this configuration, the crossband repeater only transmit when **I** am transmitting, not when the others are transmitting, which is much much easier on the radio.
 {{ :howto:xband2b.png?800 |}}
 The crossband repeater is set up with the input frequency of the repeater without the offset.  The tone is set to the repeater tone, but the tone squelch is set to something else (I'll explain in a minute). So:
-  * Unit A transmits and receives on 446.100
+  * Unit A transmits on 446.100 and receives the repeater's output on 147.**2**20.
   * 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)
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-===== Note =====
-The first draft of this page was copied over from [[https://ptruchon.pagekite.me |VE7HZF's site]] with permission.  Please feel free to expend on it.