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[aprssig] D700 or... ? for simultaneous voice and packet

Wes Johnston aprs at kd4rdb.com
Sat Feb 18 19:35:05 UTC 2006


That is correct.... If you are already transmitting voice, and the TNC
wants to transmit, it will not until you unkey.  At that moment it will
keyup and transmit a packet.  This often causes me to not hear the
courtesy beep of my local repeater.... because when I unkey, the TNC
transmits and by the time the packet is done the repeater has already
played the C beep.

Now, as far as receiving goes... If I am listening to the local 2m chit
chat, and my d700 TNC wants to transmit, depending on a menu setting it
will wait for one or both sides of the radio to be "quiet" before it
transmits.  If you have it set to "both", and there is a lot of chit
chat on your local repeater, the TNC will never transmit a position.  If
you have it set to data band only, then invaribly the tnc will keyup and
cause the voice side to mute (more correctly desense) if the voice side
is on 2m and the TNC is transmitting on 2m.  If you happen to be on a
70cm repeater, the two frequencies are so far apart that there is no
desense.

Wes

Richard Amirault wrote:
> ----- Original Message ----- From: "Jason Winningham"
> Subject: Re: [aprssig] D700 or... ? for simultaneous voice and packet
> 
>> On Feb 17, 2006, at 12:59 PM, Bruce W. Martin, KQ4TV wrote:
>>
>>> The data band would preempt the voice band when it was ready to  send
>>> a packet. I found this very frustrating when I used a V7A both  with
>>> a KPC-3+ and a TT2. That is why I switched to a D700 and have  never
>>> noticed the problem again.
>>
>>
>> Depends on how the D700 is set.  The TNC can listen to just the data 
>> band squelch or to both bands before transmitting.  I originally set 
>> it to "both", but I rarely got a packet out while monitoring 
>> repeaters, weather, etc.  I later chose to let it blank the voice 
>> band for a second in return for getting my position reports out.
> 
> 
> I think you are talking apples and oranges.  My understand of the
> original post is that the radio would "preempt" the voice band .. that
> could mean even to the point of cutting off a voice transmission in
> order to transmit on the data band.  The D700 will not do that under any
> circumstances that I've seen.
> 
> Richard Amirault                                N1JDU               
> Boston, MA, USA
> n1jdu.org                                   "Go Fly A Kite"
> 
> 
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