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(john.rabson@numeo.fr@217.67.155.178) by smtp.qtxt.dns-iol.com with SMTP; 3 May 2012 11:39:46 +0200 Mime-Version: 1.0 (Apple Message framework v1257) From: John Rabson X-Priority: 3 In-Reply-To: <00b001cd27f1$a4e512d0$4001a8c0@lark> Date: Thu, 3 May 2012 11:39:46 +0200 Message-Id: <027874A5-8A7E-4BAD-A98E-D1A17AB153CF@numeo.fr> References: <4FA04D47.6070701@iup.uni-heidelberg.de> <4C6440D382A743789157B127EF182EE5@AGB> <00b001cd27f1$a4e512d0$4001a8c0@lark> To: rsgb_lf_group@blacksheep.org X-Mailer: Apple Mail (2.1257) X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: I can't find the initial posting for this, but the replies seemed to have generated a small library of references. May I add a few points from my early days on above-ground LF, please? The old saying “if you can't hear them you can't work them” still applies. My first efforts at receiving used a 1 m diameter loop resonated at about 136 kHz, feeding a Lowe HF 250 or sometimes a Datong up-converter and a Sony 2000D. In Suffolk, these enabled me to receive G3KEV at good strength and to confirm somebody's adage (Alan?) “If DCF39 isn't S9 plus a lot your receiver may be somewhat deaf”. For displaying signals on screen I have found Argo is a very good program. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: eaf2c94dead786101818a7a2aa96a4c4 Subject: Re: LF: Basic LF understanding Content-Type: multipart/alternative; boundary="Apple-Mail=_2C238455-52E1-4D87-BEC9-F87910644570" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE autolearn=no version=2.63 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-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:491570496:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d4ad34fa252b35107 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --Apple-Mail=_2C238455-52E1-4D87-BEC9-F87910644570 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 I can't find the initial posting for this, but the replies seemed to = have generated a small library of references. May I add a few points = from my early days on above-ground LF, please? The old saying =93if you can't hear them you can't work them=94 still = applies. My first efforts at receiving used a 1 m diameter loop = resonated at about 136 kHz, feeding a Lowe HF 250 or sometimes a Datong = up-converter and a Sony 2000D. In Suffolk, these enabled me to receive = G3KEV at good strength and to confirm somebody's adage (Alan?) =93If = DCF39 isn't S9 plus a lot your receiver may be somewhat deaf=94. For = displaying signals on screen I have found Argo is a very good program. When you come to transmit, there is quite a bit to learn about antenna = construction, matching and so on. This of course applies on any band.=20 With a vertical of about 8 m height, about 2 x 30 m of horizontal = loading, and a feed current of about 400 mA (estimated ERP about 2 mW) I = achieved a range of about 200 km from my QTH in Burgundy. To do all = this, it helps to have means of measuring RF current and impedance at = the working frequency. Although I did not find it vital for my initial = experiments in transmission, a Scopematch was very useful to check that = the antenna was near Wrexham [whoops! - resonance. Thank you, = Macspeech. Always check your dictated e-mails before you send them]. 73 John F5VLF/G3PAI On 2 May 2012, at 01:23CEST, Alan Melia wrote: > You still need a receiver and aerial that work !! > :-)) > Alan >=20 > ----- Original Message -----=20 > From: "Graham" > To: > Sent: Wednesday, May 02, 2012 12:11 AM > Subject: Re: LF: Basic LF understanding >=20 >=20 >> Is there maybe something for receive newcomers? >>=20 >> Of course !!, >>=20 >> The New windows based , user friendly , Opera Beacon & QSO mode , > simply >> install , set the dial to 136/500 KHz usb , add any old aerial = and >> watch the local decodes of stations on the left side and other >> monitors on the right side , while keeping an eye on the = PSK-Reporting >> map for new Tx stations http://pskreporter.info/pskmapn.html, >>=20 >> No internet time locking , No high stability oscillators and No = need >> for guessing who you have decoded ! (unless its very good dx , = then > its >> more likely its Mr Noise playing tricks !) works with or = without >> internet connection. >>=20 >> The only real traditional CW data mode combining on-off = keying > with >> state of the art Digital Signal Processing , in fact on/off = keying has >> not been so much fun since Jean-Antoine Nollet first shocked the > world >> in 1746 , a hundred years or so before this new fangled Morse = code >> 'adopted' the idea ! >>=20 >> As one Op32 user reported after sending a 50 watt beacon ........ >>=20 >> ''Just got a report from Harry PA3BHT, who is at 174 km from me. >> He had seen that I was going on OP32 beacon and put his Opera on OP32 > mode. >>=20 >> BUT he had not attached his outside antenna!! HI.'' >>=20 >> The report was: >>=20 >> 20:45 136 PA0OCD de PA3BHT Op32 174 km -39 dB in DELFZYL with 50w + 6 = m > Vert >> + T >>=20 >> G :)) >>=20 >>=20 >>=20 >>=20 >>=20 >>=20 >>=20 >> -------------------------------------------------- >> From: "Stefan Sch=E4fer" >> Sent: Tuesday, May 01, 2012 9:53 PM >> To: >> Subject: LF: Basic LF understanding >>=20 >>> LF! >>>=20 >>> Has someone a very good link to basic understanding about LF? I mean = the >>> LF amateur radio stuff, all which one has to learn when starting = rx-wise >>> in our hobby! Maybe some ideas and examples, a good compliation. Not = to >>> complex and focusing on 137 kHz amateur radio? >>> For newcomers in the "LF-transmit-world" i recommend ON7YD's page >>> http://www.strobbe.org/on7yd/136ant/ >>> Is there maybe something for receive newcomers? >>>=20 >>> A collection of some links may help as well... >>>=20 >>> Thanks in advance. >>>=20 >>> 73, Stefan/DK7FC >>>=20 >>=20 >=20 >=20 >=20 --Apple-Mail=_2C238455-52E1-4D87-BEC9-F87910644570 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252
simply
install , set the  dial to  136/500 KHz =  usb , add  any  old  aerial =  and
watch the local =  decodes of stations  on the  left  side  and =  other
monitors on the =  right side , while  keeping  an eye on the =  PSK-Reporting
map =  for  new  Tx stations   http://pskreporter.info/pskm= apn.html,

No internet = time  locking , No high  stability  oscillators  and =  No need
for =  guessing who you  have  decoded ! (unless its  very = good dx , then
its
more =  likely its   Mr Noise playing tricks !) works  with =  or  without
internet = connection.

The only =  real  traditional  CW  data  mode =  combining   on-off = keying
with
state of the =  art  Digital Signal Processing , in fact  on/off =  keying has
not =  been  so much fun since  Jean-Antoine Nollet  first =  shocked the
world
in = 1746 , a  hundred years  or so  before this  new = fangled Morse  code
'adopted'  the  idea = !

As one Op32 user reported after  sending a 50 watt =  beacon ........

''Just got a = report from Harry PA3BHT, who is at 174 km from = me.
He had seen that I was = going on OP32 beacon and put his Opera on = OP32
mode.

BUT he had not = attached his outside antenna!! HI.''

The report = was:

20:45 136 = PA0OCD de PA3BHT Op32 174 km -39 dB in DELFZYL with 50w + 6 = m
Vert
+ = T

G :))







--------------------------------------------------
From: "Stefan Sch=E4fer" <Stefan.Schaefer@iup.= uni-heidelberg.de>
Sent: = Tuesday, May 01, 2012 9:53 PM
To: <rsgb_lf_group@blacksheep.org<= /a>>
Subject: LF: Basic LF = understanding

LF!

Has someone a very good link to = basic understanding about LF? I mean = the
LF amateur radio stuff, all which one has to learn when = starting rx-wise
in our hobby! Maybe some ideas = and examples, a good compliation. Not = to
complex and focusing on 137 kHz amateur = radio?
For newcomers in the "LF-transmit-world" i recommend = ON7YD's page
http://www.strobbe.org/on7yd= /136ant/
Is there maybe something for = receive newcomers?

A collection of some links may = help as well...

Thanks in = advance.

73, = Stefan/DK7FC






= --Apple-Mail=_2C238455-52E1-4D87-BEC9-F87910644570--