Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_50_60,HTML_MESSAGE,RATWARE_GECKO_BUILD,SUBJECT_NOVOWEL 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 t2JAOFoD019625 for ; Thu, 19 Mar 2015 11:24:15 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1YYXW1-0004Xd-NG for rs_out_1@blacksheep.org; Thu, 19 Mar 2015 10:17:25 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1YYXW1-0004XU-6M for rsgb_lf_group@blacksheep.org; Thu, 19 Mar 2015 10:17:25 +0000 Received: from mail-wi0-f179.google.com ([209.85.212.179]) by relay1.thorcom.net with esmtps (TLSv1.2:AES128-GCM-SHA256:128) (Exim 4.85) (envelope-from <73dk7fc@googlemail.com>) id 1YYXVz-0000j2-83 for rsgb_lf_group@blacksheep.org; Thu, 19 Mar 2015 10:17:24 +0000 Received: by wixw10 with SMTP id w10so64571141wix.0 for ; Thu, 19 Mar 2015 03:17:22 -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=YywNzBB/M3ksgJEMTsXssAkv6TdidIGTxzQku5doZBc=; b=qtaQN0bAZ3mg2+LkizUHXbWl6kRZs4FJ03aob1fn+X4kdtNbmLfq8xqGgZQNJFfdjv gejV5+3c3z7vbu2WPb4tNPzT2HipAh6SRLCfY4k+3xHud25s8cD+D3xnIn2+1VfaPVJs pgZ5h2b2sh3OfAOHjpoekXNfROWgOSNwbl2w1JLMcPefmx1Axc8ESgKdT7+lq+9ZAnce bw0bEAguMfHSclZxPqFmONURAMiskmQul7AQzMvQf7O+q68TjWuXyAI+Z7bcHVheowsA UZnBwSud8NM1RkSX1Ecbqfwiw0vWXATQ0ZxLFvPfb8Y079/pb7gymsLK240gl34+FeXw s9hQ== X-Received: by 10.180.189.37 with SMTP id gf5mr15106575wic.86.1426760242366; Thu, 19 Mar 2015 03:17:22 -0700 (PDT) Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de. [129.206.22.206]) by mx.google.com with ESMTPSA id lu13sm1838176wic.10.2015.03.19.03.17.21 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 19 Mar 2015 03:17:21 -0700 (PDT) From: DK7FC <73dk7fc@googlemail.com> X-Google-Original-From: DK7FC <73dk7fc@gmail.com> Message-ID: <550AA230.7050002@gmail.com> Date: Thu, 19 Mar 2015 11:17:20 +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: X-Scan-Signature: c1dcf088149efa0360827745859da381 Subject: Re: LF: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRPPPPPP... Content-Type: multipart/alternative; boundary="------------000500090107030904000209" 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: 2713 This is a multi-part message in MIME format. --------------000500090107030904000209 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi Joe, As you can see on the image, you can _directly_ generate a RF signal. It works up to 250 MHz, as i read. So you can use this arrangement for all bands up to 2m ! All informations i needed to install/run the API can be found here: https://github.com/threeme3/WsprryPi 73, Stefan Am 19.03.2015 01:02, schrieb jcraig@mun.ca: > Hi Stefan, > > That looks very nice. Is there a script for generating RF with a pi? > A 500Hz tone is easy but for higher freqs it seems a DDS is needed. > > > 73 > Joe VO1NA > On Wed, 18 Mar 2015, DK7FC wrote: > >> 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. >> > --------------000500090107030904000209 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi Joe,

As you can see on the image, you can directly generate a RF signal. It works up to 250 MHz, as i read. So you can use this arrangement for all bands up to 2m !

All informations i needed to install/run the API can be found here:
https://github.com/threeme3/WsprryPi

73, Stefan

Am 19.03.2015 01:02, schrieb jcraig@mun.ca:
Hi Stefan,

That looks very nice.  Is there a script for generating RF with a pi?
A 500Hz tone is easy but for higher freqs it seems a DDS is needed.


73
Joe VO1NA
On Wed, 18 Mar 2015, DK7FC wrote:

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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