[OZAPRS] HF frequency drift reports ...?

OE3MZC Mike oe3mzc at oevsv.at
Thu Jun 30 17:01:08 EST 2011


An entry in the list will always represent the last packet heard. 
There is also a maximum number of entries to this list (32 I guess)...
So it can be some days old of course if not much traffic and only some
stations heard.
Still I think it is helpful to compare your own frequency compared to
others.
It is not meant to measure in absolute terms. 
(Which means: VK6UZ-4 is also offset a bit-- but his DSP-TNC will
successfully decode plus/minus 400Hz from center QRG)
73 de Mike
VK3FPF/OE3MZC


-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of Gerard Hill
Sent: Donnerstag, 30. Juni 2011 06:02
To: Australian APRS Users
Subject: Re: [OZAPRS] HF frequency drift reports ...?

Hi Terry,

I would not be too concerned. Frequency reports in the list do not seem to
expire, so they'll stay there until reset. I think the list was reset or is
not being transmitted at the moment because the beacon has stopped.

Sending the report is a good idea - thanks VK6UZ! Its an automated system
though so you need to do your own verification. For example, I am sure that
VK2TV-4 is not 143 Hz low. Other entries in the list are, as far as I can
tell, reasonably accurate with a slight tendency to report too low a
frequency.

Oh and Dave, I miss VNG too. Used to use 7.5 MHz reference a lot.

Cheers ... Gerard, VK2IO

On 30/06/2011 1:23 PM, Terry Neumann wrote:
>
> It doesn't take a lot to confuse me these days. OK I'll admit it. I am 
> confused by the list of stations Mike has copied below.
>
> I've checked for myself and that's more or less what the site is 
> delivering in real time at this moment.
>
> My station is one of those listed with today's date. It hasn't been on 
> HF APRS since I returned from our Flinders Ranges trip over a couple 
> of weeks ago:
>
> http://aprs.fi/?call=vk5atn-15&mt=m&z=11&timerange=86400
> <http://aprs.fi/?call=vk5atn-15&mt=m&z=11&timerange=86400> gives the 
> true picture. It's in the shed with the HF rig off and the 20 metre 
> whip on the bar. (I just checked)
>
> So why is it appearing in the lists for today? And all of those going 
> back over the past day or so?
>
> Simple answers only please - type slowly .......
>
> Puzzled 73
> Terry
>
>
> Date: Wed, 29 Jun 2011 13:37:07 +0200
>> From: "Mike Zwingl oe3mzc"<oe3mzc at oevsv.at>
>> Subject: [OZAPRS] QRG drift  HF APRS
>> To: "Australian APRS Users"<ozaprs at aprs.net.au> 
>> Message-ID:<00ed01cc3650$e08f6800$cda8a8c0 at WORKSTATION>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> see how all stations on 10Mhz are drifting offset in QRG:
>> http://aprs.fi/?c=raw&call=vk6uz-4
>> It is not the absolute but the relative value to each other that makes
the problem in decoding hf-aprs sigs.
>> (values after callsigns is given in Hz)
>>
>> 2011-06-29 11:24:57 UTC: 
>> VK6UZ-4>APU25N,TCPIP*,qAC,T2AUST:=3211.17S/11604.17E&HF-IGATE 
>> 10147.6USB Perth
>> 2011-06-29 11:29:01 UTC: VK6UZ-4>APRS,TCPIP*,qAC,T2AUST:>dF (Hz): 
>> WIDE1 +100, VK2GKA-15 +50, VK7BW-15 +50, VK8ZAB-4 +25
>> 2011-06-29 11:29:02 UTC: VK6UZ-4>APRS,TCPIP*,qAC,T2AUST:>dF (Hz): 
>> VK4UN-4 +62, VK5ATN-15 +65, VK5LY-15 +43, VK4KWI-15 +75
>> 2011-06-29 11:29:02 UTC: VK6UZ-4>APRS,TCPIP*,qAC,T2AUST:>dF (Hz): 
>> VK2AJ-15 +50, KF7EU-6 +25, ZS6SS-3 +62, VK2TV-4 +143
>> 2011-06-29 11:29:02 UTC: VK6UZ-4>APRS,TCPIP*,qAC,T2AUST:>dF (Hz): 
>> VK3DHI-15 +68, VP8DEU +43, VK2DQC-15 +81, VK4DMI-4 +96
>> 2011-06-29 11:29:02 UTC: VK6UZ-4>APRS,TCPIP*,qAC,T2AUST:>dF (Hz): 
>> VK4HW-15 +46, VK4VP-15 +25, DL8RCB-3 +100, IW2GOB-10 +100
>> 2011-06-29 11:29:02 UTC: VK6UZ-4>APRS,TCPIP*,qAC,T2AUST:>dF (Hz): 
>> VK4KMR-15 +46, F5LDS-4 +112, VK2SX-15 +50, LA4FPA-15 +87
>> 2011-06-29 11:29:02 UTC: VK6UZ-4>APRS,TCPIP*,qAC,T2AUST:>dF (Hz): 
>> VK7DIK-4 +40, VK3MY-4 +65, VK3BZQ-9 +37, VK5LY-4 +43
>> 2011-06-29 11:29:02 UTC: VK6UZ-4>APRS,TCPIP*,qAC,T2AUST:>dF (Hz): 
>> VK4UN-15 +43, VK8LM +50, VK5LY-6 +50, VK3BDG-9 -18
>>
>
>
>
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