<html><head></head><body>What Gerard says is true. As I was using MixW as my modem for a long while, I spent a lot of time looking at its waterfall. The signals are all over the place - including the net stations. For whatever reason, VK3MY was far lower than the bulk of the stations I decode. MixW is probably a bit too critical in its frequency accuracy requirements, but if I 'netted' to VK3MY I wouldn't have decoded any other stations!<br>
I did what Gerard did - I checked I was accurate with WWVH on 10MHz and left it at that.<br>
I'm still missing strong stations that are too far off what I think is the correct frequency, but no single spot gives me all stations. Maybe I do need one of those fancy DSP modems too!<br>
<br>
Steve (VK2ZSZ)<br>
<br>
<br><br><div class="gmail_quote">Gerard Hill <vk2io@amsat.org> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre style="white-space: pre-wrap; word-wrap:break-word; font-family: sans-serif">Hi All,<br /><br />30m FSK300 APRS is a bit of a dog's breakfast at the moment. There is a <br />wide dispersal of centre frequencies being used. It isn't being helped <br />by the net stations being at least 50 Hz apart - no-one knows which one <br />to tune to. I've given up chasing net stations down the band and now use <br />WWV at 10 MHz as my reference. Its a continuous accurate transmission <br />available 24 hours a day.<br /><br />Its incumbent on the net stations to regularly check and retune their <br />transmitters so that they are exactly on frequency. Crystals do age and <br />radios do drift with temperature. The stations should be netted within <br />10 Hz of each other. Please. This will give the other users (including <br />IGates) a chance to net on the same frequency and the best chance of <br />being heard.<br /><br />Cheers ... Gerard, VK2IO<br /><br />On 29/06/2011 10:49 !
PM,
Richard Hoskin wrote:<br />> Hi Mike,<br />><br />> The tuning information is interesting…….<br />><br />> This is why we set up Net Stations several years ago. All VK HF APRS<br />> stations should tune to the designated NET station (see<br />> <a href="http://aprs.net.au/hf/hf-net-stations">http://aprs.net.au/hf/hf-net-stations</a>) By all HF APRS stations tuning to<br />> the NET station and not worrying about your radio’s frequency display<br />> everyone will be on the same wave length.<br />><br />> In most cases there should be a Secondary Net station for each frequency<br />> in a different geographical location to the Primary Net station. This<br />> will allow for station to tune in to the Secondary Net station if they<br />> are unable to hear the Primary Net. The Primary and Secondary Net<br />> Stations would be frequency synchronised.<br />><br />> Some of the Primary Net stations and Secondary Net statio!
ns have
gone<br />> off the air over the years and have not been replaced. We may need a few<br />> volunteers to run their station as a 24/7/365 Secondary Net stations if<br />> they can hear the Primaries well enough to tune in accurately.<br />><br />> It would be nice if VK6UK-4 wanted to setup as a Secondary Net station<br />> for 10MHz and tuned accurately to VK3MY-4.<br />><br />> Cheers<br />><br />> Richard<br />><br />> *From:*ozaprs-bounces@aprs.net.au [mailto:ozaprs-bounces@aprs.net.au]<br />> *On Behalf Of *Mike Zwingl oe3mzc<br />> *Sent:* Wednesday, 29 June 2011 9:37 PM<br />> *To:* Australian APRS Users<br />> *Subject:* [OZAPRS] QRG drift HF APRS<br />><br />> see how all stations on 10Mhz are drifting offset in QRG:<br />><br />> <a href="http://aprs.fi/?c=raw&call=vk6uz-4">http://aprs.fi/?c=raw&call=vk6uz-4</a> <<a
href="http://aprs.fi/?c=raw&call=vk6uz-4>">http://aprs.fi/?c=raw&call=vk6uz-4></a>;<br />><br />> It is not the absolute but the relative value to each other that makes<br />> the problem in decoding hf-aprs sigs.<br />><br />> (values after callsigns is given in Hz)<br />><br />> 2011-06-29 11:24:57 UTC: *VK6UZ-4<br />> <<a href="http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APU25N,TCPIP*,qAC,T2AUST:=3211.17S/11604.17E&HF-IGATE">http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APU25N,TCPIP*,qAC,T2AUST:=3211.17S/11604.17E&HF-IGATE</a><br />> 10147.6USB Perth<br />> 2011-06-29 11:29:01 UTC: *VK6UZ-4<br />> <<a href="http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF">http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF</a><br />> (Hz): WIDE1 +100, VK2GKA-15 +50, VK7BW-15 +50, VK8ZAB-4 +25<br />> 2011-06-29 11:29:02 UTC:
*VK6UZ-4<br />> <<a href="http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF">http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF</a><br />> (Hz): VK4UN-4 +62, VK5ATN-15 +65, VK5LY-15 +43, VK4KWI-15 +75<br />> 2011-06-29 11:29:02 UTC: *VK6UZ-4<br />> <<a href="http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF">http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF</a><br />> (Hz): VK2AJ-15 +50, KF7EU-6 +25, ZS6SS-3 +62, VK2TV-4 +143<br />> 2011-06-29 11:29:02 UTC: *VK6UZ-4<br />> <<a href="http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF">http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF</a><br />> (Hz): VK3DHI-15 +68, VP8DEU +43, VK2DQC-15 +81, VK4DMI-4 +96<br />> 2011-06-29 11:29:02 UTC: *VK6UZ-4<br />> <<a
href="http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF">http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF</a><br />> (Hz): VK4HW-15 +46, VK4VP-15 +25, DL8RCB-3 +100, IW2GOB-10 +100<br />> 2011-06-29 11:29:02 UTC: *VK6UZ-4<br />> <<a href="http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF">http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF</a><br />> (Hz): VK4KMR-15 +46, F5LDS-4 +112, VK2SX-15 +50, LA4FPA-15 +87<br />> 2011-06-29 11:29:02 UTC: *VK6UZ-4<br />> <<a href="http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF">http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF</a><br />> (Hz): VK7DIK-4 +40, VK3MY-4 +65, VK3BZQ-9 +37, VK5LY-4 +43<br />> 2011-06-29 11:29:02 UTC: *VK6UZ-4<br />> <<a
href="http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF">http://aprs.fi/?c=raw&limit=&call=VK6UZ-4>*>APRS,TCPIP*,qAC,T2AUST:>dF</a><br />> (Hz): VK4UN-15 +43, VK8LM +50, VK5LY-6 +50, VK3BDG-9 -18<br /><hr /><br />OZAPRS mailing list<br />OZAPRS@aprs.net.au<br /><a href="http://lists.aprs.net.au/mailman/listinfo/ozaprs">http://lists.aprs.net.au/mailman/listinfo/ozaprs</a><br /><br /><br /></pre></blockquote></div></body></html>