[OZAPRS] Fw: 40M APRS frequencies

Josh vk2hff at vk2hff.ampr.org
Sun Dec 3 20:13:41 AEDT 2017


I'm not sure whether it was the very small adjustment I made to the TX
audio level or the setting of the sun, but I'm being heard now:
2017-12-03 18:41:43: VK2HFF-8>APDW15,VK3OA-4
2017-12-03 18:48:13: VK2HFF-8>APDW15,VK4VP-4
2017-12-03 18:54:44: VK2HFF-8>APDW15,VK3OA-4
2017-12-03 19:01:44: VK2HFF-8>APDW15,VK2IO-4



On 3/12/2017 7:30 PM, Josh wrote:
> Hi Gavin,
> That's what I was using initially, but my SBC's under-clocked CPU wasn't
> coping too well with the extra load so I commented out the 7 at 30 decoders
> to use the default 3 at 30Hz - and that is what caused the incorrect tone
> pair to be selected.
> 
> - Josh VK2HFF
> 
> 
> On 3/12/2017 7:00 PM, Gavin Rogers wrote:
>> On 3/12/2017 3:56 PM, Josh wrote:
>>> Thanks Gerard.
>>>
>>> I had a minor issue with direwolf using the wrong tones earlier, it
>>> appears that
>>> the config line "MODEM 300" will cause 1600 & 1800 tones to be used but
>>> "MODEM 300 # [comment]" causes 1200 & 1800 Hz tones.
>> Try using
>> MODEM 300 7 at 30
>>
>> This will set up a number of modem frequency groups that'll help with
>> (mis)tuning:
>>
>> Channel 0: 300 baud, AFSK 1600 & 1800 Hz, D, 48000 sample rate
>>         0.0: D 1510 & 1710
>>         0.1: D 1540 & 1740
>>         0.2: D 1570 & 1770
>>         0.3: D 1600 & 1800
>>         0.4: D 1630 & 1830
>>         0.5: D 1660 & 1860
>>         0.6: D 1690 & 1890
>>
>> Fairly unlikely I'll get anything here on Perth on 40m on packet with my
>> antenna but I'm curious on the performance of Direwolf on HF so I'll
>> have my station listening for a few days.
>>
>> 73
>> Gavin
>> VK6HGR
>>
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