[OZAPRS] Calibration Signals

Gavin Rogers grogers at vk6hgr.echidna.id.au
Sun Nov 19 15:47:38 AEDT 2017


Yes,  but often on frequencies outside the tuning range of a RTL SDR and the complex modulation I guess would need specific calibration software like kal is for GSM, and I haven't seen any.


On 19 November 2017 12:33:52 pm AWST, vk4tec at tech-software.net wrote:
>4G should be very good
>
> 
>
>They have some of the best frequency and time standards
>
> 
>
>They have to because of the CDMA modulation
>
> 
>
>Andrew 
>
> 
>
>From: OZAPRS [mailto:ozaprs-bounces at aprs.net.au] On Behalf Of Gavin
>Rogers
>Sent: Sunday, 19 November 2017 2:27 PM
>To: Australian APRS Users <ozaprs at aprs.net.au>
>Subject: Re: [OZAPRS] How to make a raspberry pi satgate for the ISS
>
> 
>
>Maybe different in other states, but in Perth the only carrier with GSM
>still is Vodadone, and their coverage isn't good enough where I am to
>get a good calibration.
>
>
>
>
>On 19 November 2017 11:21:49 am AWST, Peter VK2MPJ <vk2mpj at yahoo.com.au
><mailto:vk2mpj at yahoo.com.au> > wrote:
>
>I’m curious why you say that using kal and a GSM signal is not possible
>anymore?
>
>I did this locally just last weekend…
>
> 
>
>2MPJ
>
> 
>
>
>
>
>
>On 19 Nov 2017, at 12:42 pm, Gavin Rogers <grogers at vk6hgr.echidna.id.au
><mailto:grogers at vk6hgr.echidna.id.au> > wrote:
>
> 
>
>On 19/11/2017 9:30 AM,  <mailto:vk4tec at tech-software.net>
>vk4tec at tech-software.net wrote:
>
> 
>
>Or, as i've mentioned before, just link to the existing Direwolf
>SDR+APRS guide, which covers off setting up an igate pretty well: 
><https://github.com/wb2osz/direwolf/blob/master/doc/Raspberry-Pi-SDR-IGate.pdf>
>https://github.com/wb2osz/direwolf/blob/master/doc/Raspberry-Pi-SDR-IGate.pdf
>
>
>In this guide, there's a link to a script that will tune to a NOAA
>frequency and re-calibrate an SDR TV stick ( 
><https://github.com/khaytsus/direwolf-init>
>https://github.com/khaytsus/direwolf-init )
>
>What would be a good high-stability signal source here in VK for the
>calibration? I used to use the kal program to calibrate against GSM
>transmitters, but that's not possible any more. I'd think the trunking
>control channel for an emergency services' channel would be stable,
>strong and always on? Or DAB+ transmitter, or..?
>
>
>73
>Gavin.
>
>
>
> 
>
>-- 
> 
>  Gavin Rogers                     |  Amateur radio station VK6HGR     
><http://www.livingwaters.com/good> http://www.livingwaters.com/good   |
>     <http://vk6hgr.ampr.org/> http://vk6hgr.ampr.org/
>MSN/Skype/Email:  <mailto:grogers at vk6hgr.echidna.id.au>
>grogers at vk6hgr.echidna.id.au
>
>_______________________________________________
>OZAPRS mailing list
> <mailto:OZAPRS at aprs.net.au> OZAPRS at aprs.net.au
><http://lists.aprs.net.au/mailman/listinfo/ozaprs>
>http://lists.aprs.net.au/mailman/listinfo/ozaprs
>
> 
>
>
>-- 
>Gavin Rogers mobile

-- 
Gavin Rogers mobile
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.aprs.net.au/pipermail/ozaprs/attachments/20171119/21b207ba/attachment-0001.html>


More information about the OZAPRS mailing list