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Anytone Anyotne 868
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Not entirely clear what you mean by "different frequencies". Normally, direct radio-to-radio communication uses a single frequency (ie simplex).
There is no reason you couldn't use different RX/TX frequencies to communicate radio to radio but that would limit the number of radios/users that could communicate among themselves. As chief21 noted above, simplex or radio to radio is typically done with one RX/TX frequency.
When you program a repeater the tx isn’t the same as rx. It’s called offset. Are we talking radio to radio? If you need to seperate things simply use different PL/DCS codes.
In my area years ago, this was common among the cab companies. It kept the cross talk to a minimum, allowing the dispatcher to give out calls without interference. In fact, a better example is the rerun of Adam-12 I'm currently watching. There are uses although they are few and far between.
I would like to setup a digital channel on an Anytone 868 to transmit on say 436.123 and receive on say 437.456 Naturally the frequencies would be transposed on the second Anytone radio. The radios will only be communicating with each other. No repeater is involved.
The concept will work but you will only be able to communicate fully with a radio programmed with the inverse RX/TX frequencies. The downside is that should another ham try to communicate with you for any reason, it will be difficult to do so. If you really wanted to go wild, you could TX on 2M and receive on 70cm.
I completely understand that no one else could communicate with these radios. That should not be an issue because these radios will mainly be used in areas surrounded by hills and woods. The nearest repeater is probably 50 or more miles away. My problem is I cannot get this to work on my radios. It will work great on Analog Channels. I have reinitialized both radios. They are setup identical except for the radio ids of course.
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In addition to the frequencies, are you also programming a common talkgroup, color code, and time slot into both radios?
Yes. The radios re programmed the same. I created the same talk group in both radios. Although I did set the TG/DMR ID to the opposite radios ID. They are using the same color code and time slot. (I have tried TS1 and TS2.) I'm sure I'm missing a setting, but I have no idea what the problem is.
I suspect the reason why this idea isn't working as expected, is down to the technical aspects of the mode and the way it's implemented in the radio.
When the radio is set with split frequencies it automatically assumes it's connecting to a repeater and therefore looks for 'handshake' data when the PTT is pressed. This 'handshake' confirms that a repeater is ready to accept your call and sends back an affirmative signal, thus enabling the radio to communicate.
With back-back handset operation in split frequency DMR mode, this handshake, whilst it may be present on the transmitting radio, the receiving radio doesn't have the facility to acknowledge it and is therefore unlikely to respond.
In true simplex mode, the radio doesn't require the handshake data to establish contact.
The above is written with the limited knowledge I have about the workings of DMR and therefore may or may not be 100% correct. Having said that, amateur radio is all about experimenting and self-training, so there's no reason not to see if you can get it to work as you wish it to.
When the radio is set with split frequencies it automatically assumes it's connecting to a repeater and therefore looks for 'handshake' data when the PTT is pressed. This 'handshake' confirms that a repeater is ready to accept your call and sends back an affirmative signal, thus enabling the radio to communicate.
With back-back handset operation in split frequency DMR mode, this handshake, whilst it may be present on the transmitting radio, the receiving radio doesn't have the facility to acknowledge it and is therefore unlikely to respond.
In true simplex mode, the radio doesn't require the handshake data to establish contact.
The above is written with the limited knowledge I have about the workings of DMR and therefore may or may not be 100% correct. Having said that, amateur radio is all about experimenting and self-training, so there's no reason not to see if you can get it to work as you wish it to.
I don't have an 868, but images indicate it has two VFOs. Why not just program the receive into the unselected VFO and the transmit into the selected VFO in simplex mode on each radio?
The radios have separate IDs
I believe you are correct. I will continue to “play” with the setup and see if I can figure it out. Thank you for your advice and insight.
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Just grabbing at straws here... You say that you created the talk group, but did you also specify the use of that talkgroup in the channel data? Are you using VFO settings only, or have you created a memory channel with the appropriate settings?
While I haven't actually loaded it into the radio, a quick experiment suggests that the DMR Mode drop-down in the Channel settings screen can be set to DMO/simplex (rather than Repeater), even though the TX/RX frequencies are not the same. This *might* allow the radio to operate as you desire without expecting a handshake from a repeater.
Yes the channels are pointing to the talk group. The talk group in each radio is set to the DMR ID of the opposite radio as well.
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Shouldn't you be using a single, common talkgroup in both radios? If radio A is set to TG 001 and radio B is set to TG 002... no go! Don't forget to check the DMR Mode setting as in my most recent post.
rescuecomm
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G6FGY is correct about trying work split without a handshake signal. Some Mototrbo radios can supply that if properly setup. I don't think the Anytone or TYT radios can do that. Just use simplex mode.
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