[arm-allstar] full duplex RF link

[Patrick Perdue]

OK, so here's where I'm struggling a bit.

duplex=0 with linktolink=yes is exactly the logic I need as far as the 
node is concerned. Audio is not repeated, and RX/TX act independently of 
each other. However, since there is a radio receiving the repeater's 
main output frequency, what is stopping the RX radio from repeating the 
audio back to the node again, causing a loop, when something is sent to 
the repeater via an Allstarlink connection or through WT? If audio comes 
in from Allstarlink, it is sent to the repeater's second receiver via 
RF, then that is heard by the repeater, and thus the RX radio, which 
sends COS, and transmits that audio back to the network, theoretically.

Is there a command-line way to have simpleusb ignore COS, so it can be 
tied to an event, like rxkeyed to prevent this from happening?

This would make it a not quite full duplex link, but would still allow 
for TX while the node is in RX, and would prevent loops.

Am I even making sense here?

On 5/4/2024 6:39 AM, Patrick Perdue wrote:
> Thanks. Yes, I have done some local testing with my full duplex node, 
> and that seems to work. May have to do some odd things to prevent 
> hearing yourself back through the repeater's main output in real time 
> when using WT mode connections, though, but I have ideas for that.
>
>
> On 5/4/2024 12:45 AM, M Lech via ARM-allstar wrote:
>> duplex=0 with linktolink=yes is what he wants. Works perfectly.
>>
>> 73,
>> Matt W6XC
>>
>> On Fri, May 3, 2024 at 9:12 PM Patrick Perdue via ARM-allstar <
>> arm-allstar at hamvoip.org> wrote:
>>
>>> Just tested, and, yes, duplex=3 does still key the transmitter. So,
>>> hmm... guess that won't work.
>>>
>>>
>>> On 5/3/2024 6:21 PM, Patrick Perdue wrote:
>>>> Greetings:
>>>>
>>>>
>>>> A local ham has a repeater connected to Allstarlink via an RF link
>>>> where internet isn't available at the site, using HamVoIP at a
>>>> location with internet. He wants this to be a full duplex link.
>>>>
>>>> His repeater has a dedicated receiver on one port of the controller.
>>>> The output of the repeater is gated. So, right now, the link radio is
>>>> receiving on the repeater's main output frequency and transmitting on
>>>> the input of the auxiliary receiver. This is configured such that all
>>>> audio passes across the RC-850 repeater controller at the same time.
>>>>
>>>> If he were to add a second radio, dedicating the existing one to RX,
>>>> and the new one for TX, how would one configure HamVoIP such that a
>>>> loop doesn't happen?
>>>>
>>>> If duplex=3, then whatever is received by the node won't be
>>>> re-transmitted, but does that still key the TX radio? I think it does,
>>>> but I'm not entirely sure about that.
>>>>
>>>> If duplex=0 or 1 with linktolink enabled, that's still going to repeat
>>>> the audio, I think, just as duplex=2 would.
>>>>
>>>> So, in this situation, given that there is only one transmitter but
>>>> two receivers on the controller, how do you stop the TX radio from
>>>> transmitting when the RX radio hears something, and still make it a
>>>> full duplex link happen?
>>>>
>>>> Or, do you?
>>>>
>>>>
>>>> 73
>>>>
>>>> N2DYI
>>>>
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