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Newbie question


 

Hello folks,

can you confirm that transmitting sub audio tones will spoil the communication, at least at 9600 baud?
That's what I found and is probably well known.?

73 Giovanni IZ5PQT


 

Yes, you are right, when transmitting APRS, you should not use any subtone, as this cause disruption on the modulated 1200 or 9600 baud tone that are use to transmit the APRS signal.


 

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Using PL tones on the the1200bps AFSK modulation version of APRS not only works but is apart of the specification called "Voice Alert":

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I've never read about it being used on 9600bps FSK signals but I can see how it wouldn't work there.? Generally speaking, 9600bps APRS isn't very common for many reasons.? Read this for more details:

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--David
KI6ZHD




On 08/10/2023 07:41 AM, MARINO MELONI via groups.io wrote:

Yes, you are right, when transmitting APRS, you should not use any subtone, as this cause disruption on the modulated 1200 or 9600 baud tone that are use to transmit the APRS signal.


 

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He wasn¡¯t asking specifically about APRS, DireWolf is also used for connected packet extensively these days.

?

Brian N2KGC

?

From: [email protected] [mailto:[email protected]] On Behalf Of David Ranch
Sent: Thursday, August 10, 2023 10:50 AM
To: [email protected]
Subject: Re: [direwolf] Newbie question

?


Using PL tones on the the1200bps AFSK modulation version of APRS not only works but is apart of the specification called "Voice Alert":

??

I've never read about it being used on 9600bps FSK signals but I can see how it wouldn't work there.? Generally speaking, 9600bps APRS isn't very common for many reasons.? Read this for more details:

??

--David
KI6ZHD



On 08/10/2023 07:41 AM, MARINO MELONI via groups.io wrote:

Yes, you are right, when transmitting APRS, you should not use any subtone, as this cause disruption on the modulated 1200 or 9600 baud tone that are use to transmit the APRS signal.

?


 

Thank you all,

in fact I was trying packet in connected mode at 9600 baud, and it did not work. Then I discovered that?
one radio had the tones on. When I put it off I got connection, However I did not notice problems at 1200 baud,

73 Giovanni?