Return-Path: X-Spam-DCC: paranoid 1169; Body=1 Fuz1=1 Fuz2=1 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_40_50,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 t3SBl1Dg006122 for ; Tue, 28 Apr 2015 13:47:01 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Yn3vj-000732-G4 for rs_out_1@blacksheep.org; Tue, 28 Apr 2015 12:43:59 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Yn3vj-00072t-44 for rsgb_lf_group@blacksheep.org; Tue, 28 Apr 2015 12:43:59 +0100 Received: from mail-wi0-f181.google.com ([209.85.212.181]) by relay1.thorcom.net with esmtps (TLSv1.2:AES128-GCM-SHA256:128) (Exim 4.85) (envelope-from <73dk7fc@googlemail.com>) id 1Yn3vh-0007jS-4g for rsgb_lf_group@blacksheep.org; Tue, 28 Apr 2015 12:43:57 +0100 Received: by widdi4 with SMTP id di4so136509317wid.0 for ; Tue, 28 Apr 2015 04:43:56 -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=z0MXUPfJ6pU7iKX1LiXH7vzKmUlbEbH+GR1XHYTFkPA=; b=05SC9my9qsaQT/+AsPqfA05JDFGsu4ljgX5lomPx174ngeMhWIgIiiSWG5GCX50nqJ FpCscSXfnHyPmz9A6OdChcfL2DBXg6/aL+MPUbbnzsXB4xW55cWZxDziZ9bcfIsebtHv UMTHoOkUKsTDlAFLhsbR/E6vqXlGS+ilsrrAS7YD2lrmanLGVwLVWNh1H2HVBUErQnFS LLzRkYpRRZFmH3uIrZpB3zsO89uSMLG+ZVGlQJmdjtfDflRKhWZP0FP8sBzfcEKoRQ1q 3koDEPiO9CmB8RhNgrRck5Ln61AStAfOApb3tdQBLYyTn6WdCJqVBJ3FJ/G2GFUX8JQ6 Nu1w== X-Received: by 10.194.81.1 with SMTP id v1mr30434804wjx.50.1430221436025; Tue, 28 Apr 2015 04:43:56 -0700 (PDT) Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de. [129.206.22.206]) by mx.google.com with ESMTPSA id nb9sm16012405wic.10.2015.04.28.04.43.54 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 28 Apr 2015 04:43:55 -0700 (PDT) From: DK7FC <73dk7fc@googlemail.com> X-Google-Original-From: DK7FC <73dk7fc@gmail.com> Message-ID: <553F727A.1090000@gmail.com> Date: Tue, 28 Apr 2015 13:43:54 +0200 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: <579355A36AEE9D4FA555C45D556003AB1B0F3BE2@servigilant.vigilant.local> In-Reply-To: <579355A36AEE9D4FA555C45D556003AB1B0F3BE2@servigilant.vigilant.local> X-Scan-Signature: 9bd342c7d74bc0c7d15d59c1164ca995 Subject: Re: LF: Re: New QRPPP test to night on WSPR 2 MF Content-Type: multipart/alternative; boundary="------------080906060708020704020000" 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: 3021 This is a multi-part message in MIME format. --------------080906060708020704020000 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Hi Luis, Am 28.04.2015 10:34, schrieb VIGILANT Luis Fernández: > The closer station is Maxi EA5CV. But he lacks a good Rx and antenna > for MF As long as the frequency of the RX is stable, it should work well. A deaf RX can produce good results if the input signal is strong, you know. For example, if he has a IC706 and a dipole for the 40m band, he could make a T antenna out of the dipole, with a resonated tuning/matching. This should provide enough signal strength and prevent QRM / RX overload due to the spectrum limitation. > Unfortunately there is no interest at all in the local hams for > activities other than DX pileups in HF 599! But i think there are good chances to find new stations in EA! You just need to search them actively. For example: Use the WSPR map, select all bands and 24h, and see which station is active in EA. Then contact him/her by qrz.com and ask for a cooperation, generate some motivation to try something really new and exciting... If you contact such a station, you know that it is active, it has a internet connection and a running PC and knows what WSPR is. Then it is more likely to get a positive feedback. Maybe it's better to focus on stations being active on the lower bands rather than 10m or so. I just made the test and found 14 from EA and 2 from CT :-) If you decide to find one from EA, i will go to find one from CT. I know it works because i have done it in the past, on LF :-) > and summit activations on 40m during weekends. Ah! .... and some > digital voices modes too Beeing outside the shack is a good first step! But 40m is the wrong band ;-) > My best reference is my own Rx site at 7Km using MiniWhip and Perseus > + SDR-Console V2 > which provides up to 6 VFOs sending each the audio stream to a > different decoder > The nice side of QRPP is that any small change worth the efforts. And > there is plenty of room for improving ! Oh yes indeed, i also noted that it is easier to improve the signal by 20 dB if you are starting at 1 mW TX pwr rather than 100 W :-) > Tx running 7/24. Water cooling the 2xBS170 but it worths !!! ;-) Yes, a BS170 is a good choice for a 3.3V output and it also has a very low input capacity. It was my first idea to use a BS170 for the Raspberry project too. But actually i find that a ICL7667 is a better choice, even if the output is 4*f, i.e. ~ 1900 kHz for MF. My 12V 100W PA is using an ICL7667 as the MOSFET driver (2x IRFZ48N), so you can use your QRPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP signal and realise a (power) gain of > 40 dB :-) Did you measure the RF current into your loop? Is the loop vertical or horizontal? What is the height above ground? I recommend to watch the antenna current because at higher power levels, the C can warm up and detune the loop. The resulting mismatch will then reduce the power taken from the PA... Nice hobby :-) 73, Stefan > 73 de Luis > EA5DOM --------------080906060708020704020000 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi Luis,

Am 28.04.2015 10:34, schrieb VIGILANT Luis Fernández:
The closer station is Maxi EA5CV. But he lacks a good Rx and antenna for MF
As long as the frequency of the RX is stable, it should work well. A deaf RX can produce good results if the input signal is strong, you know. For example, if he has a IC706 and a dipole for the 40m band, he could make a T antenna out of the dipole, with a resonated tuning/matching. This should provide enough signal strength and prevent QRM / RX overload due to the spectrum limitation.

Unfortunately there is no interest at all in the local hams for activities other than DX pileups in HF
599!

But i think there are good chances to find new stations in EA! You just need to search them actively. For example: Use the WSPR map, select all bands and 24h, and see which station is active in EA. Then contact him/her by qrz.com and ask for a cooperation, generate some motivation to try something really new and exciting... If you contact such a station, you know that it is active, it has a internet connection and a running PC and knows what WSPR is. Then it is more likely to get a positive feedback. Maybe it's better to focus on stations being active on the lower bands rather than 10m or so.
I just made the test and found 14 from EA and 2 from CT :-)
If you decide to find one from EA, i will go to find one from CT. I know it works because i have done it in the past, on LF :-)

and summit activations on 40m during weekends. Ah! .... and some digital voices modes too
Beeing outside the shack is a good first step! But 40m is the wrong band ;-)
 
My best reference is my own Rx site at 7Km using MiniWhip and Perseus + SDR-Console V2
which provides up to 6 VFOs sending each the audio stream to a different decoder
 
The nice side of QRPP is that any small change worth the efforts. And there is plenty of room for improving !
Oh yes indeed, i also noted that it is easier to improve the signal by 20 dB if you are starting at 1 mW TX pwr rather than 100 W :-)
 
Tx running 7/24. Water cooling the 2xBS170 but it worths !!! ;-)
Yes, a BS170 is a good choice for a 3.3V output and it also has a very low input capacity. It was my first idea to use a BS170 for the Raspberry project too. But actually i find that a ICL7667 is a better choice, even if the output is 4*f, i.e. ~ 1900 kHz for MF.
My 12V 100W PA is using an ICL7667 as the MOSFET driver (2x IRFZ48N), so you can use your QRPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP signal and realise a (power) gain of  > 40 dB :-)

Did you measure the RF current into your loop? Is the loop vertical or horizontal? What is the height above ground?
I recommend to watch the antenna current because at higher power levels, the C can warm up and detune the loop. The resulting mismatch will then reduce the power taken from the PA...
Nice hobby :-)

73, Stefan
 
73 de Luis
EA5DOM
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