Return-Path: X-Spam-DCC: paranoid 104; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.6 required=5.0 tests=BAYES_00,HTML_50_60, HTML_MESSAGE,HTML_TITLE_EMPTY,RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t2QMOsnl025183 for ; Thu, 26 Mar 2015 23:24:55 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1YbG61-0006gf-Kb for rs_out_1@blacksheep.org; Thu, 26 Mar 2015 22:17:49 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1YbG61-0006gW-3q for rsgb_lf_group@blacksheep.org; Thu, 26 Mar 2015 22:17:49 +0000 Received: from mail-wg0-f44.google.com ([74.125.82.44]) by relay1.thorcom.net with esmtps (TLSv1.2:AES128-GCM-SHA256:128) (Exim 4.85) (envelope-from <73dk7fc@googlemail.com>) id 1YbG5z-0002Oy-3u for rsgb_lf_group@blacksheep.org; Thu, 26 Mar 2015 22:17:47 +0000 Received: by wgbcc7 with SMTP id cc7so79212736wgb.0 for ; Thu, 26 Mar 2015 15:17:45 -0700 (PDT) X-DKIM-Result: Domain=googlemail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20120113; h=from:message-id:date:user-agent:mime-version:to:subject:references :in-reply-to:content-type; bh=MGLRbynhkOgWtyOAQ1BPdzPhUhdRQAUiIwztnNbUbQc=; b=ZIhnMgKLORQhoKCs0SzKSs0RBe0rD2En0BT6PKyl2mHfxSnSPilVPQ+jnRscu96MLI bAVaAVUHmX4LFKGKMft/wujgnQH1w2PRb73Cl7eoW1yacIBO9fAv1XMtysodxd9KjQvS ThxfCer/R/splOx4XAQafVO1ohsJNfpg5/HqlwTUs3MdSzchRE4Nb7AdqsH/FDQhrwak BX3BzSH7poGFt8KyX6bag8OB0DGpmJRhSW42ARqW+eLlp/jVrtdsguqGAYE2mzaZiA/5 MEOAvIxwvZPbf3cJeDAck05ivEtxIE+/c2pOg1JCb2NjlV9j1Qxq1NIhESREgrZxhY9p 6xHg== X-Received: by 10.195.11.161 with SMTP id ej1mr31283689wjd.47.1427408265624; Thu, 26 Mar 2015 15:17:45 -0700 (PDT) Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de. [129.206.22.206]) by mx.google.com with ESMTPSA id e18sm146965wjz.27.2015.03.26.15.17.44 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 26 Mar 2015 15:17:44 -0700 (PDT) From: DK7FC <73dk7fc@googlemail.com> X-Google-Original-From: DK7FC <73dk7fc@gmail.com> Message-ID: <55148587.3090101@gmail.com> Date: Thu, 26 Mar 2015 23:17:43 +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> <55102D0C.8040405@gmail.com> In-Reply-To: <55102D0C.8040405@gmail.com> X-Scan-Signature: 052e5a7ab87161a07560b72babff3441 Subject: Re: LF: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRP... Content-Type: multipart/alternative; boundary="------------030400020700010104090702" 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: 2787 This is a multi-part message in MIME format. --------------030400020700010104090702 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi MF, I'm now running the 7667 at 13.8V supply voltage. The MOSFET driver is easily keyed by the Raspi, directly with its rectangular output. I measured _*0.5 W TX power*_ at 50 Ohm. This is what i'm running tonite on 630m. Not a real PA, just the Raspi and this IC in a DIL-8 case. Fascinating!... 73, Stefan Am 23.03.2015 16:11, schrieb DK7FC: > 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. --------------030400020700010104090702 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi MF,

I'm now running the 7667 at 13.8V supply voltage. The MOSFET driver is easily keyed by the Raspi, directly with its rectangular output. I measured 0.5 W TX power at 50 Ohm. This is what i'm running tonite on 630m.
Not a real PA, just the Raspi and this IC in a DIL-8 case. Fascinating!...

73, Stefan


Am 23.03.2015 16:11, schrieb DK7FC:
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.
--------------030400020700010104090702--