Return-Path: X-Spam-DCC: paranoid 1170; 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=-2.1 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,HTML_50_60,HTML_MESSAGE 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 t3SFwC7Q006794 for ; Tue, 28 Apr 2015 17:58:12 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Yn7q9-0007O7-KT for rs_out_1@blacksheep.org; Tue, 28 Apr 2015 16:54:29 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Yn7q9-0007Ny-4w for rsgb_lf_group@blacksheep.org; Tue, 28 Apr 2015 16:54:29 +0100 Received: from s16315160.onlinehome-server.info ([87.106.80.234] helo=mail.vigilant.es) by relay1.thorcom.net with esmtp (Exim 4.85) (envelope-from ) id 1Yn7q6-0008WR-8G for rsgb_lf_group@blacksheep.org; Tue, 28 Apr 2015 16:54:27 +0100 Received: from servigilant.vigilant.local ([87.216.178.132]) by vigilant.es with MailEnable ESMTP; Tue, 28 Apr 2015 17:54:07 +0200 Received: from servigilant.vigilant.local ([fe80::3cdf:95f8:c1c9:3931]) by servigilant.vigilant.local ([fe80::3cdf:95f8:c1c9:3931%17]) with mapi id 14.03.0123.003; Tue, 28 Apr 2015 17:54:09 +0200 From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= To: "rsgb_lf_group@blacksheep.org" Thread-Topic: LF: Re: New QRPPP test to night on WSPR 2 MF Thread-Index: AQHQf1VN0xpMHwT0i0mC57x8gzQss51gcpiAgACIWiCAAAYpgIABFcDwgAAaKACAAFglIA== Date: Tue, 28 Apr 2015 15:54:08 +0000 Message-ID: <579355A36AEE9D4FA555C45D556003AB1B0F416E@servigilant.vigilant.local> In-Reply-To: <553F727A.1090000@gmail.com> Accept-Language: es-ES, en-US Content-Language: es-ES X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.0.2] MIME-Version: 1.0 X-Scan-Signature: 961b72438de48e5ba6ae15a9c530febb Subject: RE: LF: Re: New QRPPP test to night on WSPR 2 MF Content-Type: multipart/alternative; boundary="_000_579355A36AEE9D4FA555C45D556003AB1B0F416Eservigilantvigi_" 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: 3022 --_000_579355A36AEE9D4FA555C45D556003AB1B0F416Eservigilantvigi_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Stefan We try to spread interest by publishing information and results in the URE = forum, which has a dedicated area to long waves http://www.ure.es/foro/17-ondas-largas.html But you are right. Active motivation is the key. You proved it clearly on y= our Christmast transmission last winter Noted. I'll try to do something when I be grown up ...in ERP :-) Did you measure the RF current into your loop? Is the loop vertical or hori= zontal? What is the height above ground? The best I did was a current measurement tester based on G4HUP (and others)= design http://g4hup.com/RFC/RFC.htm This was a great help to know were was the loop resonating and tune it corr= ectly I have installed it permanently in the loop and have the milliamperimeter d= own in the shack connected by two wires The variable capacitor is motorized, so I can fine tune the loop from the s= hack. And yes .... tunning is sharp ! But the RF current system is not calibrated. So I use it as differential in= dicator The maximum current I can get in the DC line is 5mA. Don't know which is th= e relation of the ferrite transformer I'm using 10 turns as secodary Capacitors are good QRO ones. All is ready to "grown up". Life is too short= for QRPPPP :-))) I'm living in the antenna tower. Or better said, the antenna is on top of a= building tower which makes 28th floors .... about 80m high As I can not simply hang it from top, the loop is installed horizontally us= ing as much as possible of the free terrace area on top The loop uses 70m RG59 coax cable using braid+inner shorted at the ends. I = use 1 m PVC tube poles on top of ventilation chimmenys to support the loop. It is terminated in a cabinet were I have ro= om enought for the variable capacitor and future PA This links to pictures showing the box https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/CAM00342.jpg https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/CAM00343.jpg And this is the variable capacitor + 800pF fixed caps + motor speed reducer= /controller + Sensing current + Coupling transformer https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/CAM00370.jpg I choosed the loop because at this height from ground, any ground reference= d antenna would hardly work (or that's what I suppose) It is not easy visible to the neighbours and not disturbing as a vertical p= ole or any other top loaded antennas would be. And highly resistant to winds. It actually uses five support poles and the RG59 is not= a heavy load Like it ! :-) 73 de Luis EA5DOM ________________________________ De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blackshe= ep.org] En nombre de DK7FC Enviado el: martes, 28 de abril de 2015 13:44 Para: rsgb_lf_group@blacksheep.org Asunto: Re: LF: Re: New QRPPP test to night on WSPR 2 MF Hi Luis, Am 28.04.2015 10:34, schrieb VIGILANT Luis Fern=E1ndez: 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 R= X can produce good results if the input signal is strong, you know. For exa= mple, if he has a IC706 and a dipole for the 40m band, he could make a T an= tenna out of the dipole, with a resonated tuning/matching. This should prov= ide enough signal strength and prevent QRM / RX overload due to the spectru= m 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 nee= d 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 r= eally new and exciting... If you contact such a station, you know that it i= s 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 t= o 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 vo= ices 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 de= coder 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 d= B 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 proje= ct 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 yo= u can use your QRPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP sig= nal and realise a (power) gain of > 40 dB :-) Did you measure the RF current into your loop? Is the loop vertical or hori= zontal? What is the height above ground? I recommend to watch the antenna current because at higher power levels, th= e C can warm up and detune the loop. The resulting mismatch will then reduc= e the power taken from the PA... Nice hobby :-) 73, Stefan 73 de Luis EA5DOM --_000_579355A36AEE9D4FA555C45D556003AB1B0F416Eservigilantvigi_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Stefan
 
We try to spread interest by publ= ishing information and results in the URE forum, which has a dedicated area= to long waves
 
But you are right. Active motivat= ion is the key. You proved it clearly on your Christmast transmission = last winter
Noted. I'll try to do something w= hen I be grown up ...in ERP :-)
 
Did you measure the RF current into your loop? I= s the loop vertical or horizontal? What is the height above ground?
The best I did was a current measurement tester based o= n G4HUP (and others) design http://g4hup.com/RFC/RFC.htm
This was a great help to know were was the loop resonating a= nd tune it correctly
I have installed it permanently in the loop and have the mil= liamperimeter down in the shack connected by two wires
The variable capacitor is motorized, so I can fine tune the = loop from the shack. And yes .... tunning is sharp !
 
But the RF current system is not calibrated. So I use it as = differential indicator
The maximum current I can get in the DC line is 5mA. Don't k= now which is the relation of the ferrite transformer
I'm using 10 turns as secodary
 
Capacitors are good QRO ones. All is ready to &q= uot;grown up". Life is too short for QRPPPP  :-)))<= /font>
 
I'm living in the antenna tower. Or better said,= the antenna is on top of a building tower which makes 28th floors .... abo= ut 80m high
As I can not simply hang it from top, the loop i= s installed horizontally using as much as possible of the free terrace area= on top
The loop uses 70m RG59 coax cable using bra= id+inner shorted at the ends. I use 1 m PVC tube poles on top of v= entilation
chimmenys to support the loop. It is terminated = in a cabinet were I have room enought for the variable capacitor = and future PA
 
This links to pictures showing the box
https://dl.dropboxusercontent.com/u/= 7162072/Fotos%20varias/MF/CAM00342.jpg
https://dl.dropboxusercontent.com/u/= 7162072/Fotos%20varias/MF/CAM00343.jpg
 
And this is the variable capacitor + 800pF fixed caps &#= 43; motor speed reducer/controller + Sensing current + Coupling tra= nsformer
 
 
I choosed the loop because at this height from ground, any g= round referenced antenna would hardly work (or that's what I suppose)
It is not easy visible to the neighbours and not disturbing = as a vertical pole or any other top loaded antennas would be. And highly
resistant to winds. It actually uses five support poles and = the RG59 is not a heavy load
 
Like it ! :-)
 
73 de Luis
EA5DOM=
De: owner-rsgb_lf_group@blacksheep.= org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de DK7FC
Enviado el: martes, 28 de abril de 2015 13:44
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: Re: New QRPPP test to night on WSPR 2 MF

Hi Luis,

Am 28.04.2015 10:34, schrieb VIGILANT Luis Fern=E1ndez:
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 R= X can produce good results if the input signal is strong, you know. For exa= mple, if he has a IC706 and a dipole for the 40m band, he could make a T an= tenna 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 interes= t 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 nee= d 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 yo= u contact such a station, you know that it is active, it has a internet con= nection 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 10= m 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 dur= ing weekends. Ah! .... and some digital voices modes too
Beeing outside the shack is a good first step! But 40m is the wrong band ;-= )
&= nbsp;
My best reference is my own Rx si= te at 7Km using MiniWhip and Perseus + SDR-Console V2
which provides up to 6 VFOs sendi= ng each the audio stream to a different decoder
&= nbsp;
The nice side of QRPP is that any= small change worth the efforts. And there is plenty of room for impro= ving !
Oh yes indeed, i also noted that it is easier to improve the signal by 20 d= B 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 proje= ct 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 yo= u can use your QRPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP sig= nal and realise a (power) gain of  > 40 dB :-)

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

73, Stefan
 
73 de Luis
EA5DOM=
--_000_579355A36AEE9D4FA555C45D556003AB1B0F416Eservigilantvigi_--