[OZAPRS] HF frequency drift reports ...?

VK4UN vk4un at bigpond.com
Thu Jun 30 20:53:25 EST 2011


Hi Mike, I have a curious question the call sign VK3FPF doesn't come up on 
the ACMA Database, was trying to look up where you are located, any ideas 
why??

73's

David   VK4UN

----- Original Message ----- 
From: "OE3MZC Mike" <oe3mzc at oevsv.at>
To: <vk2io at amsat.org>; "'Australian APRS Users'" <ozaprs at aprs.net.au>
Sent: Thursday, June 30, 2011 5:01 PM
Subject: Re: [OZAPRS] HF frequency drift reports ...?


> 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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