[OZAPRS] Calibration Signals

Sun Nov 19 15:50:53 AEDT 2017

I run an AisPy R2 here with 10 MHz locked to GPS 

I figure that’s as good as its going to get

Andrew 

From: OZAPRS [mailto:ozaprs-bounces at aprs.net.au] On Behalf Of Gavin Rogers
Sent: Sunday, 19 November 2017 2:48 PM
To: Australian APRS Users <ozaprs at aprs.net.au>
Subject: Re: [OZAPRS] Calibration Signals

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 <mailto: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 <mailto: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

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