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From: DK7FC <73dk7fc@googlemail.com>
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Subject: Re: LF: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRPPPP...
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Hi MF,
I've added a simple ICL7667CPA MOSFET-driver to the GPIO of the
Raspberry. It's power supply is 5V coming from the GPIO itselfe. This
leads to a 5V rectangular signal with lower output impedance. I've
coupled the output matching circuit so that the output power is now 50
mW / 17 dBm, i.e. 7 dB more power then in my previous test.
Iamge:
https://dl.dropboxusercontent.com/u/19882028/MF/17dBm%20RPI%20WSPR.jpg
The beacon is running now on 475.685 kHz.
73, Stefan/DK7FC
Am 18.03.2015 21:45, schrieb DK7FC:
> Hi MF,
>
> Today i've got i 3rd Raspberry Pi. I quickly installed the WSPR
> softaware and since a few minutes i am transmitting WSPR-2 on 630m, my
> usual frequency 475.685 kHz.
>
> I'm directly using the GPIO output pin, without an amp stage behind!
> The rectangular 3.3V output voltage is passing a cap and an isolation
> transformer (FT50-77) as well as a simple pi-filter, because it is a
> Raspberry pi! ;-)
>
> See:
> https://dl.dropboxusercontent.com/u/19882028/MF/Raspberry%20Pi%20B%2B%20WSPR%20TX.jpg
>
> I measured an output power of about 10 mW at 50 Ohm. It is now
> connected to my MF antenna and transmits in a 100% duty cycle. I still
> have to learn how to reduce it but this will not take long.
>
> With 10 mW TX power i managed decodes by 3 stations now.
>
> 3 spots:
>
> Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
> 2015-03-18 20:32 DK7FC 0.475684 -21 0 JN49ik 0.01
> DH5RAE JN68qv 345 98
> 2015-03-18 20:12 DK7FC 0.475685 -24 0 JN49ik 0.01
> F1AFJ JN06ht 667 247
> 2015-03-18 20:06 DK7FC 0.475683 -27 0 JN49ik 0.01
> DL1DBC JO41bi 217 349
>
>
>
> Does someone have good ears to get a decode from me? :-) It is a
> challenge! :-)
>
> 73, Stefan/DK7FC
>
> PS: The signal is so weak that my RX antenna frontend is not
> overloaded, so at that power level i can transmit and receive to the
> same time :-)
> PPS: A small amp stage will follow soon, i intend to use an BS170
> running at 5 V.
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Hi MF, <br>
<br>
I've added a simple ICL7667CPA MOSFET-driver to the GPIO of the
Raspberry. It's power supply is 5V coming from the GPIO itselfe. This
leads to a 5V rectangular signal with lower output impedance. I've
coupled the output matching circuit so that the output power is now 50
mW / 17 dBm, i.e. 7 dB more power then in my previous test.<br>
Iamge:
<a class="moz-txt-link-freetext" href="https://dl.dropboxusercontent.com/u/19882028/MF/17dBm%20RPI%20WSPR.jpg">https://dl.dropboxusercontent.com/u/19882028/MF/17dBm%20RPI%20WSPR.jpg</a><br>
<br>
The beacon is running now on 475.685 kHz. <br>
<br>
73, Stefan/DK7FC<br>
<br>
<br>
Am 18.03.2015 21:45, schrieb DK7FC:
<blockquote cite="mid:5509E3D5.90900@gmail.com" type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
Hi MF, <br>
<br>
Today i've got i 3rd Raspberry Pi. I quickly installed the WSPR
softaware and since a few minutes i am transmitting WSPR-2 on 630m, my
usual frequency 475.685 kHz. <br>
<br>
I'm directly using the GPIO output pin, without an amp stage behind!
The rectangular 3.3V output voltage is passing a cap and an isolation
transformer (FT50-77) as well as a simple pi-filter, because it is a
Raspberry pi! ;-)<br>
<br>
See:
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="https://dl.dropboxusercontent.com/u/19882028/MF/Raspberry%20Pi%20B%2B%20WSPR%20TX.jpg">https://dl.dropboxusercontent.com/u/19882028/MF/Raspberry%20Pi%20B%2B%20WSPR%20TX.jpg</a><br>
<br>
I measured an output power of about 10 mW at 50 Ohm. It is now
connected to my MF antenna and transmits in a 100% duty cycle. I still
have to learn how to reduce it but this will not take long.<br>
<br>
With 10 mW TX power i managed decodes by 3 stations now.<br>
<p>3 spots:</p>
<table>
<tbody>
<tr>
<th>Timestamp</th>
<th>Call</th>
<th>MHz</th>
<th>SNR</th>
<th>Drift</th>
<th>Grid</th>
<th>Pwr</th>
<th>Reporter</th>
<th>RGrid</th>
<th>km</th>
<th>az</th>
</tr>
<tr>
<td align="right"> 2015-03-18 20:32 </td>
<td align="left"> DK7FC </td>
<td align="right"> 0.475684 </td>
<td align="right"> -21 </td>
<td align="right"> 0 </td>
<td align="left"> JN49ik </td>
<td align="right"> 0.01 </td>
<td align="left"> DH5RAE </td>
<td align="left"> JN68qv </td>
<td align="right"> 345 </td>
<td align="right"> 98 </td>
</tr>
<tr>
<td align="right"> 2015-03-18 20:12 </td>
<td align="left"> DK7FC </td>
<td align="right"> 0.475685 </td>
<td align="right"> -24 </td>
<td align="right"> 0 </td>
<td align="left"> JN49ik </td>
<td align="right"> 0.01 </td>
<td align="left"> F1AFJ </td>
<td align="left"> JN06ht </td>
<td align="right"> 667 </td>
<td align="right"> 247 </td>
</tr>
<tr>
<td align="right"> 2015-03-18 20:06 </td>
<td align="left"> DK7FC </td>
<td align="right"> 0.475683 </td>
<td align="right"> -27 </td>
<td align="right"> 0 </td>
<td align="left"> JN49ik </td>
<td align="right"> 0.01 </td>
<td align="left"> DL1DBC </td>
<td align="left"> JO41bi </td>
<td align="right"> 217 </td>
<td align="right"> 349 </td>
</tr>
</tbody>
</table>
<br>
<br>
Does someone have good ears to get a decode from me? :-) It is a
challenge! :-)<br>
<br>
73, Stefan/DK7FC<br>
<br>
PS: The signal is so weak that my RX antenna frontend is not
overloaded, so at that power level i can transmit and receive to the
same time :-)<br>
PPS: A small amp stage will follow soon, i intend to use an BS170
running at 5 V.<br>
</blockquote>
</body>
</html>
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