[OZAPRS] Fw: 40M APRS frequencies

Mon Dec 4 04:10:35 AEDT 2017

Once I get my HF sorted I would be interested in running it more often 

Andrew 

From: OZAPRS [mailto:ozaprs-bounces at aprs.net.au] On Behalf Of Gerard Hill
Sent: Sunday, 3 December 2017 11:08 PM
To: Australian APRS Users <ozaprs at aprs.net.au>
Subject: Re: [OZAPRS] Fw: 40M APRS frequencies

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 <mailto: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

_______________________________________________
OZAPRS mailing list
OZAPRS at aprs.net.au <mailto:OZAPRS at aprs.net.au> 
http://lists.aprs.net.au/mailman/listinfo/ozaprs

_______________________________________________
OZAPRS mailing list
OZAPRS at aprs.net.au <mailto:OZAPRS at aprs.net.au> 
http://lists.aprs.net.au/mailman/listinfo/ozaprs

_______________________________________________
OZAPRS mailing list
OZAPRS at aprs.net.au <mailto:OZAPRS at aprs.net.au> 
http://lists.aprs.net.au/mailman/listinfo/ozaprs

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.aprs.net.au/pipermail/ozaprs/attachments/20171204/4cba8a25/attachment-0001.html>