Return-Path: X-Spam-DCC: paranoid 1102; 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=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_50_60,HTML_MESSAGE,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 t2NGpBV1009235 for ; Mon, 23 Mar 2015 17:51:11 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Ya5WV-0000ru-Hf for rs_out_1@blacksheep.org; Mon, 23 Mar 2015 16:48:19 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Ya5WU-0000rl-WA for rsgb_lf_group@blacksheep.org; Mon, 23 Mar 2015 16:48:18 +0000 Received: from mail-we0-f179.google.com ([74.125.82.179]) by relay1.thorcom.net with esmtps (TLSv1.2:AES128-GCM-SHA256:128) (Exim 4.85) (envelope-from <73dk7fc@googlemail.com>) id 1Ya5WS-00084A-Tn for rsgb_lf_group@blacksheep.org; Mon, 23 Mar 2015 16:48:17 +0000 Received: by wegp1 with SMTP id p1so142712152weg.1 for ; Mon, 23 Mar 2015 09:48:16 -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=XMKTIcBMZcsexBRJm8fMKj7IxrCkqYgQS8lkCDwMfHY=; b=A9RTMCmKKPTnFUGqpyDedzlrBCriZBXcWpXyeFzjdw4zdBN1BdC/WcvFgqU7khDdsY Z2crrsT+N7nJ2DJ8tLqGRfeOGbfyZ3y/MPHb3YA3H4j/CTHv3rlfgSyA0dKy4de9E6Ri P6tcIl68QWeHp9jVbwlwiVrPQbReKSW0YfqiK4nM2+zec72PrAxOIzIZWrJZue4V5Vr0 vreS+iEvLZqLGS83QzYETGRj3jg0ZkyevXklQzy0L8t6WSmtYxV7pxJnhDBA7jVvgfj9 QAEhEshOZnQPxTG0JOd7UMycHG1acc7solEtEM+tPOpxWBq/najq+9gawhExGcE5bmqb DJ0g== X-Received: by 10.180.91.79 with SMTP id cc15mr20160808wib.37.1427129295984; Mon, 23 Mar 2015 09:48:15 -0700 (PDT) Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de. [129.206.22.206]) by mx.google.com with ESMTPSA id a13sm2154989wjx.30.2015.03.23.09.48.14 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 23 Mar 2015 09:48:15 -0700 (PDT) From: DK7FC <73dk7fc@googlemail.com> X-Google-Original-From: DK7FC <73dk7fc@gmail.com> Message-ID: <551043CD.3090102@gmail.com> Date: Mon, 23 Mar 2015 17:48:13 +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: X-Scan-Signature: 3f96c9ff152a6a60cc2344b4cc7e7dd2 Subject: Re: LF: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRPPPP... Content-Type: multipart/alternative; boundary="------------040504020103040100010206" 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: 2771 This is a multi-part message in MIME format. --------------040504020103040100010206 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi Laurence, These diodes are ZD15 Z-diodes, just to prevent eventual transients damaiging the board. They may catch some energy from nearby lightnig strikes. All this is very unlikely here, in March anyway... 73, Stefan PS: Next step will be to run the 7667 on a 12V supply. This should allow me to directly drive my PA which i'm normally using for MF WSPR. Am 23.03.2015 17:35, schrieb Laurence KL7 L: > Nice Stefan - are the two back to back diodes just before the LPF to > catch noise spikes back towards the 7667 or another purpose? > > Laurence KL7 L > Snowless Alaska > > ------------------------------------------------------------------------ > From: 73dk7fc@googlemail.com > Date: Mon, 23 Mar 2015 16:11:08 +0100 > To: rsgb_lf_group@blacksheep.org > Subject: Re: LF: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRPPPP... > > 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. > --------------040504020103040100010206 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi Laurence,

These diodes are ZD15 Z-diodes, just to prevent eventual transients damaiging the board. They may catch some energy from nearby lightnig strikes. All this is very unlikely here, in March anyway...

73, Stefan

PS: Next step will be to run the 7667 on a 12V supply. This should allow me to directly drive my PA which i'm normally using for MF WSPR.


Am 23.03.2015 17:35, schrieb Laurence KL7 L:
Nice Stefan - are the two back to back diodes just before the LPF to catch noise spikes back towards the 7667 or another purpose?
 
Laurence KL7 L
Snowless Alaska
 
From: 73dk7fc@googlemail.com
Date: Mon, 23 Mar 2015 16:11:08 +0100
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRPPPP...

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.
--------------040504020103040100010206--