[arm-allstar] half duplex node linking to a repeater

[kk6ecm]

My understanding is that simplex mode is when the tx and rx frequencies are the same. Half duplex uses different frequencies for each, but not transmitting and receiving at the same time. E.g. Your HT talking to a repeater.

What is not clear to me is how to setup the hang times for the half duplex when linked to full duplex repeater? Should it be very short?

Thanks,
Bob
kk6ecm

Sent from iPad


> On Jul 18, 2015, at 5:32 AM, Neil Sablatzky <k8it at cac.net> wrote:
> 
> I don't understand like Cory said if the transmitter is transmitting how can you receive being half duplex is sharing transmit and receive on the same frequency?
> 
> Sent from my iPhone
> 
>> On Jul 18, 2015, at 4:39 AM, David McGough <kb4fxc at inttek.net> wrote:
>> 
>> 
>> Hi Sione,
>> 
>> Yes, you can override and "key up" a half-duplex (HD) node. The method is
>> to connect to the HD node from a full-duplex (FD -- e.g.: duplex=2
>> repeater) node. When the FD node is receiving a signal (COS active), it'll
>> key the HD node, even if the HD node is receiving.
>> 
>> This method causes a side effect, which must be overcome, however. Since 
>> the HD node will almost always be hearing something (COS active), the 
>> app_rpt timeout timers will never reset and the FD repeater will 
>> eventually time-out. This limitation can be overcome by temporarily 
>> disabling the time-out timer (COP,8 command). Then, re-enable the timer 
>> (COP,7) once you're finished.
>> 
>> We use this method on various remote-base radios and repeaters daily and
>> it works well.  I've found that some FD repeater users must have a little
>> training to understand the non-standard repeater behavior when using this
>> method, but once they understand it, all is good.
>> 
>> Finally, there is one HUGE factor to think about when using this method:  
>> The FD repeater transmitter will likely be at 100% duty cycle--the FD
>> repeater almost never un-keys while working this way...So, make sure your
>> RF hardware is up to the challenge!
>> 
>> 
>> 73, David KB4FXC
>> 
>> 
>>> On Fri, 17 Jul 2015, Sione Ragle wrote:
>>> 
>>> 
>>> Hi I have a node that is used for linking my local repeater to another 
>>> repeater using a half duplex node.
>>> 
>>> Some repeaters I link do have a long hang time and I find that I can't 
>>> keyup the link until the remote repeater is unkey. Is there a way to 
>>> make it so I can key up the half duplex node at any time I want and not 
>>> wait for the carrier to drop from the remote end?
>>> 
>>> Thanks,
>>> --Sione
>>> 
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>> 
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