[OZAPRS] Fw: 40M APRS frequencies

Josh vk2hff at vk2hff.ampr.org
Mon Dec 4 10:46:19 AEDT 2017


Yep, your RX volume is just a tad too high.
Either reduce the radio's volume or the sound card's mic/line in gain
until its closer to 50.
If you start direwolf with the arg '-a 10' it will report the audio
levels every 10 seconds which can assist with setting the volume initially.

- Josh VK2HFF

On 4/12/2017 9:50 AM, Gavin Rogers wrote:
> I'd say mine. I'm using the incredibly technical interface of using an
> audio cable from the headphone jack to the sound card :)
> 
> The antenna is a long wire, although resonant on 40m, I suffer from S7-9
> noise on all bands at all times (suburban areas, woo hoo!) , hence my
> limited HF experience.
> 
> 
> On 4 December 2017 6:41:11 am AWST, Scott Evans <vk7hse at gmail.com> wrote:
> 
>     Hi Gavin,
> 
>     Curious, but the mention of the audio level being too high, is that
>     saying that mine is or yours? ūü§Ē
> 
> 
>     On Mon., 4 Dec. 2017, 09:25 Gavin Rogers,
>     <grogers at vk6hgr.echidna.id.au <mailto:grogers at vk6hgr.echidna.id.au>>
>     wrote:
> 
>         Captured a handful of frames last night here in Perth on 40m. I
>         guess it
>         works! Also is my first 40m digital RX, so that's nice :)
> 
>         VK7HSE-4 audio level = 139(11/14)   [NONE]   __||___
>         Audio input level is too high.  Reduce so most stations are
>         around 50.
>         [0.2] VK7HSE-4>APRX29,WIDE2-1:!4259.56SI14718.64E#RasPi iGate & Digi
>         Position, OVERLAY DIGI (green star) w/overlay I, >40 APRSmax
>         S 42 59.5600, E 147 18.6400
>         RasPi iGate & Digi
> 
>         VK7HSE-4 audio level = 158(11/19)   [SINGLE]   __::___
>         Audio input level is too high.  Reduce so most stations are
>         around 50.
>         [0.2] VK7HSE-4>APRX29,WIDE2-1:!4259.56SI14718.64E#RasPi iGate & Digi
>         Position, OVERLAY DIGI (green star) w/overlay I, >40 APRSmax
>         S 42 59.5600, E 147 18.6400
>         RasPi iGate & Digi
> 
> 
> 
>         73
>         Gavin
>         VK6HGR
> 
>         On 3/12/2017 4:00 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
>         >
> 
>         --
> 
>                Gavin Rogers                     |  Amateur radio station
>         VK6HGR
>              http://www.livingwaters.com/good   |   
>          http://vk6hgr.ampr.org/
>                         MSN/Skype/Email: grogers at vk6hgr.echidna.id.au
>         <mailto:grogers at vk6hgr.echidna.id.au>
> 
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> 
> 
> -- 
> Gavin Rogers mobile
> 
> 
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