John,

I forgot to mention that transmitted signal used for level adjustment
was performed by either n7nix deviation measure deviation script or
using direwolf -t 0 -x

Bernard

Le 09/04/2019 à 21:42, f6bvp a écrit :
> Hi John,
>
> I performed audio level adjustment for I found that FTM-100DE VHF
> transmitted signal from DRAWS modem was spreading around the TX frequency.
>
> After adjusment this is the result of alsa-show.sh :
>
>  ===== ALSA Controls for Radio Tansmit =====
> LO Driver Gain  L:[15.00dB]   R:[15.00dB]
> PCM           L:[-31.00dB]    R:[-31.00dB]
> DAC Playback PT       L:[PTM_P3]      R:[PTM_P3]
> LO Playback CM        [Full Chip CM]
>
>  ===== ALSA Controls for Radio Receive =====
> ADC Level     L:[0.00dB]      R:[-5.00dB]
> IN1           L:[Off]         R:[Off]
> IN2           L:[10 kOhm]     R:[10 kOhm]
> CM            L:[10 kOhm]     R:[10 kOhm]
>
> Here is how I proceeded for level adjustement using alsamixer.
> I have set a second yaesu device with a Raspberry Pi, UDRC II modem and
> audacity to listen to my packets.
> While recording the audio signal, I first changed LO driver gain in
> alsamixer.
> I then stepped down the PCM and then increased it again until the
> received signal did not increase any more.
>
> With above levels, the transmitted 1200 bauds FSK signal was clean and
> it was copied correctly by adjacent APRS repeater stations.
>
> On average received APRS frames are reported to have an audio level
> around 20. AFSK frames are perfectly decoded.
>
> 73 de Bernard, f6bvp
>
> p.s. there is a typo in first line of alsa-show.sh dump:
>      "Radio Tansmit =====" should be Radio Transmit =====
>
>
> Le 06/04/2019 à 18:22, John Spoonhower a écrit :
>> Bernard,
>> I am curious about what are the audio level settings for this radio. Can
>> you please post the results of "alsa-show.sh"?
>> 73,
>> John,
>> NX2I
>>