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[aprssig] Local Event using RELAY?

Wes Johnston aprs at kd4rdb.com
Tue Mar 29 12:13:52 UTC 2005


Ahh, but there is a way around that problem with the d700.... you can 
program it
to a=TX b=RX mode and set teh A vfo to 144.39, and B vfo to 144.99.  You will
also need to program the tnc to DCD sense from both sides.

There is nothing you can't do with a d700, a basic stamp, duct tape, a flux
capacitor and dilithium crystals.  lol.

Wes

Quoting Robbie - WA9INF <mwrobertson at comcast.net>:

> Chris,
>
> You do not understand Chris. The D-700 would be listening on 144.990,
> but transmitting on 144.390 as if in Repeater mode. You just "offset"
> the transmit frequency by 600 khz. I have not actually done this with
> mine since I had no need to try it. But it means then, you listen on
> 144.990, and with the digipeat on RELAY or whatever the tracker is set
> to on 144.990, the D-700 would digipeat it out on 144.390 without having
> any means to "hold off" transmitting if the channel is busy. Not good
> practice nor is it correct.
>
> Robbie
>
> Chris Rose wrote:
>> The radio won't transmit if its beacon is off will it?
>>  If it isn't set to transmit at set interval it won't
>> unless it hears something from its digi?  If it is
>> only hearing on .99, then it will only digi what it
>> hears, won't it?  If it only hears on .99 then it
>> would only retransmit what it heard on .99.  Why is
>> that so bad?
>>
>> 73,
>> Chris KB8UIH
>>
>> --- Robbie Robertson <mwrobertson at comcast.net> wrote:
>>
>>> Bob,
>>>
>>> That then makes the TMD-700 to transmit on 144.390
>>> without listening first and thus qrm'ing anything else on 144.390.
>>> That is not the right way to operate period.
>>>
>>> We have had this discussion before, and others
>>> agreed. If there is no other transmission being heard by a station, it is
>>> assumed ok to transmit, but just to turn on without listening for
>>> a signal is wrong.
>>>
>>> If the event stations on 144.990 were to be
>>> transmitting at a fast rate, even at 30 seconds, and 4, 5 or more 
>>> units, then the
>>> TMD-700 would be constantly key down irrespectful of other activity
>>> on 144.390. I think every tracker from tt to whatever, at least has
>>> "Activity" hold off!
>>>
>>> To suggest that others do this is not correct.
>>>
>>> Robbie
>>>
>>> Robert Bruninga wrote:
>>>
>>>>>>> Boyd D Garrett Sr <N5CTI at texasnative.com> >>
>>>>>
>>>>> I plan to support a public service event from my
>>>
>>> bicycle.
>>>
>>>>> (TH-D7)... so Net Control can track my position. I
>>>
>>> ...have
>>>>> virtually no chance of getting into a WIDE digi
>>>
>>> ...
>>>
>>>>> so I plan to have my truck in the vicinity with my
>>>
>>>>> TM-D700 set for RELAY digipeating.
>>>>
>>>>
>>>> Then I would set your mobile DIGI to RELAY but set
>>>
>>> it
>>>
>>>> to listen on 144.99 and TX on 144.39.  Then
>>>
>>> operate
>>>
>>>> all trackers at the event on 144.99.  That way
>>>
>>> they
>>>
>>>> get a 100% clear channel and yet the event and
>>>> everything else shows up on 144.39
>>>>
>>>> Bob
>>>>
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>>>
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>
>
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