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<p class="x_MsoNormal"><span lang="EN-GB">Andrew</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">OFDM is fairly new but been around for awhile on APRS. Works great on HF, works much better than FSK, but not much adoption here, mainly EU and some USA stations..</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">Regards</span></p>
<p class="x_MsoNormal"><span lang="EN-GB">Pete</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">For others who may be interested in the detail..</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB"><a href="https://www.sigidwiki.com/wiki/Robust_PACKET">https://www.sigidwiki.com/wiki/Robust_PACKET</a></span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">Sent from my Windows 10 phone</p>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> OZAPRS <ozaprs-bounces@aprs.net.au> on behalf of Andrew Rich <vk4tec@tech-software.net><br>
<b>Sent:</b> Sunday, November 19, 2017 4:13:11 PM<br>
<b>To:</b> Australian APRS Users<br>
<b>Subject:</b> Re: [OZAPRS] Calibration Signals</font>
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<div class="PlainText">Just seeing if your paying attention<br>
<br>
Orthaganol Frequency Division Multiplexing <br>
<br>
New APRS mode ?<br>
<br>
A<br>
<br>
> On 19 Nov 2017, at 2:40 pm, Glen English VK1XX <glenlist@pacificmedia.com.au> wrote:<br>
> <br>
> I think you have a typo, Andrew, I think you meant to type 3G , not 4G<br>
> <br>
> Yes, 3G uses CDMA and requires critical relative timing references for<br>
> scrambling code chip offsets. For a chip rate of 3.84 Mcps, or a very<br>
> small fraction of the cycle time of 260 nS.<br>
> <br>
> (4G uses OFDM. Timing requirements for OFDM are on OFDM frame boundaries<br>
> which are quite slow in order of (1/15e3) + guard band.)<br>
> <br>
> <br>
> <br>
> On 19/11/2017 3:33 PM, vk4tec@tech-software.net wrote:<br>
>> <br>
>> 4G should be very good<br>
>> <br>
>> <br>
>> <br>
>> They have some of the best frequency and time standards<br>
>> <br>
>> <br>
>> <br>
>> They have to because of the CDMA modulation<br>
>> <br>
>> <br>
>> <br>
>> Andrew<br>
>> <br>
>> <br>
>> <br>
>> *From:*OZAPRS [<a href="mailto:ozaprs-bounces@aprs.net.au">mailto:ozaprs-bounces@aprs.net.au</a>] *On Behalf Of *Gavin<br>
>> Rogers<br>
>> *Sent:* Sunday, 19 November 2017 2:27 PM<br>
>> *To:* Australian APRS Users <ozaprs@aprs.net.au><br>
>> *Subject:* Re: [OZAPRS] How to make a raspberry pi satgate for the ISS<br>
>> <br>
>> <br>
>> <br>
>> Maybe different in other states, but in Perth the only carrier with<br>
>> GSM still is Vodadone, and their coverage isn't good enough where I am<br>
>> to get a good calibration.<br>
>> <br>
>> <br>
>> On 19 November 2017 11:21:49 am AWST, Peter VK2MPJ<br>
>> <vk2mpj@yahoo.com.au <<a href="mailto:vk2mpj@yahoo.com.au">mailto:vk2mpj@yahoo.com.au</a>>> wrote:<br>
>> <br>
>> I’m curious why you say that using kal and a GSM signal is not<br>
>> possible anymore?<br>
>> <br>
>> I did this locally just last weekend…<br>
>> <br>
>> <br>
>> <br>
>> 2MPJ<br>
>> <br>
>> <br>
>> <br>
>> <br>
>> <br>
>> On 19 Nov 2017, at 12:42 pm, Gavin Rogers<br>
>> <grogers@vk6hgr.echidna.id.au<br>
>> <<a href="mailto:grogers@vk6hgr.echidna.id.au">mailto:grogers@vk6hgr.echidna.id.au</a>>> wrote:<br>
>> <br>
>> <br>
>> <br>
>> On 19/11/2017 9:30 AM, vk4tec@tech-software.net<br>
>> <<a href="mailto:vk4tec@tech-software.net">mailto:vk4tec@tech-software.net</a>> wrote:<br>
>> <br>
>> <br>
>> <br>
>> Or, as i've mentioned before, just link to the existing<br>
>> Direwolf SDR+APRS guide, which covers off setting up an<br>
>> igate pretty<br>
>> well: <a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fwb2osz%2Fdirewolf%2Fblob%2Fmaster%2Fdoc%2FRaspberry-Pi-SDR-IGate.pdf&data=02%7C01%7Cvk3tbn%40hotmail.com%7C0bc9413bcba944009e1708d52f0c466a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636466652135705756&sdata=VbpuXmu21bhlpUJigD0FuRBj%2FrY%2FgN%2FM6yhVMgqBH3Y%3D&reserved=0">
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>> <br>
>> <br>
>> In this guide, there's a link to a script that will tune to a<br>
>> NOAA frequency and re-calibrate an SDR TV stick<br>
>> ( <a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fkhaytsus%2Fdirewolf-init&data=02%7C01%7Cvk3tbn%40hotmail.com%7C0bc9413bcba944009e1708d52f0c466a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636466652135705756&sdata=UxVgQyZdu5S8L85%2BUnwuqt8xLTkn2Tyxwjlaj1Siirc%3D&reserved=0">
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)<br>
>> <br>
>> What would be a good high-stability signal source here in VK<br>
>> for the calibration? I used to use the kal program to<br>
>> calibrate against GSM transmitters, but that's not possible<br>
>> any more. I'd think the trunking control channel for an<br>
>> emergency services' channel would be stable, strong and always<br>
>> on? Or DAB+ transmitter, or..?<br>
>> <br>
>> <br>
>> 73<br>
>> Gavin.<br>
>> <br>
>> <br>
>> <br>
>> -- <br>
>> <br>
>> <br>
>> <br>
>> Gavin Rogers | Amateur radio<br>
>> station VK6HGR <br>
>> <br>
>> <a href="https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.livingwaters.com%2Fgood&data=02%7C01%7Cvk3tbn%40hotmail.com%7C0bc9413bcba944009e1708d52f0c466a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636466652135705756&sdata=LRlzhXIIEYmOv960FNIN9rSJsCSJRJ1Nd2l3xZzQq8s%3D&reserved=0">
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| <br>
>> <a href="https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fvk6hgr.ampr.org%2F&data=02%7C01%7Cvk3tbn%40hotmail.com%7C0bc9413bcba944009e1708d52f0c466a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636466652135705756&sdata=hsqoJZ88gVjo1jzyO4uK4w5avdnDiLCKk8YWww%2FxA0g%3D&reserved=0">
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>> <br>
>> MSN/Skype/Email: grogers@vk6hgr.echidna.id.au<br>
>> <<a href="mailto:grogers@vk6hgr.echidna.id.au">mailto:grogers@vk6hgr.echidna.id.au</a>><br>
>> <br>
>> _______________________________________________<br>
>> OZAPRS mailing list<br>
>> OZAPRS@aprs.net.au <<a href="mailto:OZAPRS@aprs.net.au">mailto:OZAPRS@aprs.net.au</a>><br>
>> <a href="https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.aprs.net.au%2Fmailman%2Flistinfo%2Fozaprs&data=02%7C01%7Cvk3tbn%40hotmail.com%7C0bc9413bcba944009e1708d52f0c466a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636466652135705756&sdata=Btro8%2BghAjFdQnmUda6BhSW4Rx4y%2F76ddy853M6uxLo%3D&reserved=0">
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>> <br>
>> <br>
>> <br>
>> <br>
>> -- <br>
>> Gavin Rogers mobile<br>
>> <br>
>> <br>
>> <br>
>> _______________________________________________<br>
>> OZAPRS mailing list<br>
>> OZAPRS@aprs.net.au<br>
>> <a href="https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.aprs.net.au%2Fmailman%2Flistinfo%2Fozaprs&data=02%7C01%7Cvk3tbn%40hotmail.com%7C0bc9413bcba944009e1708d52f0c466a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636466652135705756&sdata=Btro8%2BghAjFdQnmUda6BhSW4Rx4y%2F76ddy853M6uxLo%3D&reserved=0">
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> <br>
> <br>
> _______________________________________________<br>
> OZAPRS mailing list<br>
> OZAPRS@aprs.net.au<br>
> <a href="https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.aprs.net.au%2Fmailman%2Flistinfo%2Fozaprs&data=02%7C01%7Cvk3tbn%40hotmail.com%7C0bc9413bcba944009e1708d52f0c466a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636466652135705756&sdata=Btro8%2BghAjFdQnmUda6BhSW4Rx4y%2F76ddy853M6uxLo%3D&reserved=0">
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<br>
_______________________________________________<br>
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