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[129.206.22.206]) by mx.google.com with ESMTPSA id dx11sm1794565wjb.23.2015.03.23.08.11.09 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 23 Mar 2015 08:11:09 -0700 (PDT) From: DK7FC <73dk7fc@googlemail.com> X-Google-Original-From: DK7FC <73dk7fc@gmail.com> Message-ID: <55102D0C.8040405@gmail.com> Date: Mon, 23 Mar 2015 16:11:08 +0100 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4698D0522AFD45F896A41F2D16A2D831@AGB> <19EEF7A6DD30462FA6ACC0F015DC9F52@AGB> <5509E3D5.90900@gmail.com> In-Reply-To: <5509E3D5.90900@gmail.com> X-Scan-Signature: 7c995d39cde70605aa76dd18810a4256 Subject: Re: LF: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRPPPP... Content-Type: multipart/alternative; boundary="------------040805030109070300090502" X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 2768 This is a multi-part message in MIME format. --------------040805030109070300090502 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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. --------------040805030109070300090502 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit 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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