[OZAPRS] Calibration Signals

[vk2tv]

Or if you want cheaper suggestions take a look here ... 
http://www.febo.com/time-freq/index.html

The site is owned by John Ackerman, N8UR, a name well known to old 
packet radio hands.

Ray vk2tv


On 19/11/17 22:51, Matthew Cook wrote:
> For when you decide to get serious about frequency accuracy...
>
> http://www.fei-zyfer.com/gpstarplus.htm
>
> That then feeds the IRIG-A clock on the wall that I recently acquired, 
> fun to watch the hands go backwards a few weeks ago.
>
> The oscillator I've recently completed at work is one order of 
> magnitude better than this, I'm still two orders of magnitude short of 
> the team at Tid, maybe one day.
>
> 73
>
> Matthew
> VK5ZM
>
> On 19 November 2017 at 15:20, <vk4tec at tech-software.net 
> <mailto:vk4tec at tech-software.net>> wrote:
>
>     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
>     <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
>     <mailto: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
>         <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,vk4tec at tech-software.net
>                 <mailto: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/
>
>                                MSN/Skype/Email:
>                 grogers at vk6hgr.echidna.id.au
>                 <mailto:grogers at vk6hgr.echidna.id.au>
>
>                 _______________________________________________
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>                 <http://lists.aprs.net.au/mailman/listinfo/ozaprs>
>
>
>     -- 
>     Gavin Rogers mobile
>
>
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