[OZAPRS] Fw: 40M APRS frequencies

[Gerard Hill]

Good to see two more gateways!

Josh, the adjustment to the audio may have been the critical breakthrough.
The main thing is to make sure everything is linear - no distortion on the
audio or overdriving of the transmitter.
Propagation has played its part too. During the day time, VK4VP-4 and
VK3OA-4 would be difficult to reach in summer on 40m - they are over 800km
away.
This afternoon there has been an E-layer present which may have assisted
propagation to my IGate, or it may just have been ground wave. We won't
know while the E-layer is present.
Anyway, impressive result!

Cheers,
Gerard - VK2IO

On 3 December 2017 at 21:46, Glen English VK1XX <
glenlist at pacificmedia.com.au> wrote:

> actually I am a bit puzzled about why it started working when the sun went
> down.
>
> I ran some simulations and predictions, and the only thing I can come up
> with is that there was some E layer blanketing and your antenna (or the
> receiver antenna) wouldnt support the low E layer propagation angles
> efficently...
>
> otherwise, I dunno
>
> g
>
> On 3/12/2017 8:13 PM, Josh wrote:
>
>> 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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>
>
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