Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-df03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 734F8380000C0; Mon, 25 Jun 2012 20:09:11 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SjJKS-0003Fv-4V for rs_out_1@blacksheep.org; Tue, 26 Jun 2012 01:08:24 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SjJKR-0003Fm-2D for rsgb_lf_group@blacksheep.org; Tue, 26 Jun 2012 01:08:23 +0100 Received: from nm15-vm0.bullet.mail.ird.yahoo.com ([77.238.189.216]) by relay1.thorcom.net with smtp (Exim 4.77) (envelope-from ) id 1SjJKN-0000YN-PZ for rsgb_lf_group@blacksheep.org; Tue, 26 Jun 2012 01:08:21 +0100 Received: from [77.238.189.232] by nm15.bullet.mail.ird.yahoo.com with NNFMP; 26 Jun 2012 00:08:18 -0000 Received: from [212.82.108.119] by tm13.bullet.mail.ird.yahoo.com with NNFMP; 26 Jun 2012 00:08:18 -0000 Received: from [127.0.0.1] by omp1028.mail.ird.yahoo.com with NNFMP; 26 Jun 2012 00:08:18 -0000 X-DKIM-Result: Domain=yahoo.co.uk Result=Good and Known Domain X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 456554.39515.bm@omp1028.mail.ird.yahoo.com Received: (qmail 70862 invoked by uid 60001); 26 Jun 2012 00:08:18 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s1024; t=1340669298; bh=lKx88PaL/bOE0YJhYhFeHVR5M/jT9fzHemn3JndJaOA=; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=OykaYijqBA6xvjQrZVKUT0ePGDO32ceiPpsMAbQSXy6ngEcTgtyuPsYfYQZeixW9s6DMZT8yS9oJLfGK1gnix9z9yHeQNVJQQl8LzwOSn/ZkYRiM/TvlP/MU8et2O96EWFumTqYM6jT3mEjdyO+Lez1jlbiogLX+t+pF4L5wxKQ= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.co.uk; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=BIS7Qo2rBX/H/1VxJJz0qNH/kUyafS7fvnbrgEPuKbPZkKinka8a83l3S6Cv6WvMk2YosAP7iS2NodsuWLlidhpoD2yCMIbBXSSnEdSzM8DYOU561rXFa9ROgB1eS+AMdgrVlxQgGnpAAfGxBmG+Ry5keO9AmQw4JSDmBcR26pU=; X-YMail-OSG: .o.qXMUVM1nGvy1UEA4s3je2gUzbv9OHAVtrS0BSTCw1CDy .2slf030Zu7Sz6M3L7XyOsSLZ_HFasE4LMKdXF8dPF2LiK7qgLwKIoKQwsHm 6hKSV2zrzCQ8ksyilVJZ9aahuhnS2A3t2s23l8vRdtWtHpkij3anu9gHLcRq BOVEqMvi.hYWD4DxRrNWPgNIjzOPewkEbMYV.X0r8lGVyebzisV3zRgUGXtQ 1jDOONNTtxK9_WDfSPPmxf_TzjLIfVhjQxr298Ra83LVYE_I1LNE9axZ9VAn KHuBmd3uXLYGrCQqydlZmx.5LzbE1yq0tUcM9OKwXrq9YOSOOgi2iOxKyN8b D8127Z0hwB58s8EDAIhFHEOJOIfiAOkAenDx8mbpDApK1MQhFuVHmSAzIIAf L4pSlKsgx2WyEqMXK81VcloG9GKXWkvZaTzrEYvLq8nkMufxsvpMBDuywE9n tmFFTFlygj5nR6nt3HpZzph9bf1isslhcDQPn.vqfFdEtBnyYJWYh6whLnjh CdNBKLawwtD3HKmr8w2nkIzEBtVGtDKOMwzd6fZbUTvDFzahLeHeu7bzIHG5 wSDMPxthS_OQSLiv.YKzhUMFqO.1N0NiZ48NOLdt6bnrs6Ok7n3X4CJQLsQ5 FDlOSUwJlctDVj.gYxd3oUMavORSOz5g29fn97fSbcGG3TDnTBcLq_R7Itlz CpjQH Received: from [86.164.26.59] by web171601.mail.ir2.yahoo.com via HTTP; Tue, 26 Jun 2012 01:08:18 BST X-Mailer: YahooMailWebService/0.8.118.349524 References: <20120625.113436.1661.631277@mailpop04.vgs.untd.com> <1340654283.10216.YahooMailNeo@web171603.mail.ir2.yahoo.com> <1340658147.14634.YahooMailNeo@web171604.mail.ir2.yahoo.com> <7D46521111C34DC380603D43B22BCB8D@AGB> Message-ID: <1340669298.70238.YahooMailNeo@web171601.mail.ir2.yahoo.com> Date: Tue, 26 Jun 2012 01:08:18 +0100 (BST) From: M0FMT To: "rsgb_lf_group@blacksheep.org" In-Reply-To: <7D46521111C34DC380603D43B22BCB8D@AGB> MIME-Version: 1.0 X-Spam-Score: 1.0 (+) 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: Hi Graham  OK a subtle point AM is a "Transparent" mode FM is a "Capture" mode and as such not suitable for AC use where simultaneous transmission can block calls. Small random offsets in carrier frequency cause hetrodynes that alert ATC of the presents of a weaker call. Nothing in Marine is ever that immediate so I guess it was expedient to opt for the El-Cheapo FM solution there can be no other reason. Probably a bunch of Civil Servants were conned into believing AM stood for Ancient Modulation.  You are right there are lot of extras that could be added to SDR software and perfectly feasible we just need to learn to programme and add all the goodies we think are needed or find a friendly software jockey to do it for us...... hee!  As far as up converters go the ubiquitous chip is the multiplex FST3253 used in Softrock and other well known up-converters for RX and TX switched with a 90 degree phase shift LO from a pair of 7474 flip flops is the basis for most current SDR detectors or TX mixers. There are now relatively cheap A/D converters which give a wider BW than the are currently available Sound Card solution. And now its all being integrated onto a single IC so your comment earlier about a USB stick TX is with us. It just needs a mass market for the price to come right down and I guess it comes through the Mobile Phone market.  Big bang doesn't frighten me all bottles here matey retro shack thermionic not thermonuclear.  You'll be telling me next that the Moons gravity bends light ergo radio waves?  It's late!!!   73 es GL Pete M0FMT IO91UX [...] Content analysis details: (1.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [77.238.189.216 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (m0fmt[at]yahoo.co.uk) 0.0 HTML_MESSAGE BODY: HTML included in message 1.0 FSL_FREEMAIL_1 FSL_FREEMAIL_1 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: b3b0f15d0cbaee08765b7bacd0352512 Subject: Re: LF: SDR programs Content-Type: multipart/alternative; boundary="-1613889061-1868787260-1340669298=:70238" 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, TO_ADDRESS_EQ_REAL 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: 0:2:486410112:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m244.2 ; domain : yahoo.co.uk DKIM : fail x-aol-sid: 3039ac1d40d74fe8fda6293e X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ---1613889061-1868787260-1340669298=:70238 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Graham=0A=C2=A0=0AOK a subtle point AM is a "Transparent" mode FM is a "= Capture" mode and as such not suitable for AC use where simultaneous transm= ission can block calls. Small random offsets in carrier frequency cause het= rodynes=C2=A0that alert ATC of the presents of a weaker call. Nothing in Ma= rine is ever that immediate so I guess it was expedient to opt for the El-C= heapo FM solution there can be no other reason. Probably a bunch of Civil S= ervants were conned into believing AM stood for Ancient Modulation.=0A=C2= =A0=0AYou are right there are lot of extras that could be added to SDR soft= ware and perfectly feasible we just need to learn to programme and add all = the goodies we think are needed or find a friendly software jockey to do it= for us...... hee!=0A=C2=A0=0AAs far as up converters go the ubiquitous chi= p is the multiplex FST3253 used in Softrock and other well known up-convert= ers for RX and TX switched with a 90 degree phase shift LO=C2=A0from a pair= of 7474 flip flops is the basis for most current SDR detectors or TX mixer= s. There are now relatively cheap A/D converters which give a wider BW than= the are currently available Sound Card solution. And now its all being int= egrated onto a single IC so your comment earlier about a USB stick TX is wi= th us. It just needs a mass market for the price to=C2=A0come right down an= d=C2=A0I guess it comes through the Mobile Phone market.=C2=A0=0A=C2=A0=0AB= ig bang doesn't frighten me all bottles here matey retro shack thermionic n= ot thermonuclear.=0A=C2=A0=0AYou'll be telling me next that the Moons gravi= ty bends light ergo radio waves?=0A=C2=A0=0AIt's late!!!=0A=C2=A0=0A=C2=A0= =0A73 es GL Pete M0FMT IO91UX=0A=0A=0A________________________________=0A F= rom: Graham =0ATo: rsgb_lf_group@blacksheep.org = =0ASent: Monday, 25 June 2012, 23:38=0ASubject: Re: LF: SDR programs=0A = =0A=0AR Pete =0A=0AAhh=C2=A0=C2=A0 By=C2=A0 split=C2=A0, I mean the=C2=A0 = anti-jam=C2=A0=C2=A0 =0Ain channel=C2=A0 split=C2=A0 , When=C2=A0 on the=C2= =A0 same=C2=A0 frequency, =0Athe=C2=A0 ground=C2=A0 TX=C2=A0 (used tobe ?)= =C2=A0=C2=A0 off=C2=A0 set=C2=A0 =0Afrom the=C2=A0 aircraft=C2=A0 Tx=C2=A0 = frequency=C2=A0=C2=A0, so=C2=A0 if =0Athe=C2=A0 Aircraft TX jammed=C2=A0 'O= N' then=C2=A0 other=C2=A0 aircraft=C2=A0 =0Acould=C2=A0 still=C2=A0 receive= =C2=A0 the=C2=A0 ground =C2=A0 , that=C2=A0 =0Awas=C2=A0 the=C2=A0 reason= =C2=A0 for=C2=A0 wide=C2=A0 IF pass=C2=A0 bands =0Aand=C2=A0 keeping=C2=A0 = to AM=C2=A0 for the=C2=A0 comm.'s ....=C2=A0 =0AMarine=C2=A0 coms=C2=A0 , a= dopted=C2=A0 FM ... =0A=0AThere is a=C2=A0 afc=C2=A0 for=C2=A0 cw =0A=0A= =0AOT ?=C2=A0 over the=C2=A0 top=C2=A0 more like ,=C2=A0 the=C2=A0 disclaim= er =0Aon the=C2=A0 yab-a-dab-a-doo=C2=A0 group=C2=A0 =C2=A0 is bigger=C2=A0= than =0Athe=C2=A0 space=C2=A0 left=C2=A0 for the=C2=A0 messages , I think = the=C2=A0 =0Aname=C2=A0 Black-Sheep=C2=A0 seems=C2=A0 to=C2=A0 be=C2=A0 qui= te=C2=A0 apt=C2=A0 =0Anow=C2=A0 !, =0A=0ABig-bang=C2=A0 , according=C2=A0 = to=C2=A0 my=C2=A0 arrl=C2=A0 hand=C2=A0 =0Abook , HF communications=C2=A0 w= ill=C2=A0 tend to=C2=A0 be=C2=A0 =0Aattenuated=C2=A0 in the=C2=A0 direction= =C2=A0 of the=C2=A0 burst=C2=A0 , =0Aassume=C2=A0 by=C2=A0 producing=C2=A0 = quite=C2=A0 a big=C2=A0 =0AFariday=C2=A0=C2=A0 screen , also=C2=A0 recommen= ds=C2=A0 you=C2=A0 keep=C2=A0 =0Ayour=C2=A0 radio=C2=A0 in a=C2=A0 metal=C2= =A0 sweet tin ala=C2=A0=C2=A0 blue =0Apeter=C2=A0 garden !=C2=A0 =0A=0ADid= =C2=A0 get=C2=A0 good=C2=A0 signals=C2=A0 on the=C2=A0 MW on the=C2=A0 =0Aw= ay=C2=A0 to=C2=A0 work=C2=A0 from=C2=A0 France=C2=A0 during=C2=A0 the=C2=A0= =0Aeclipse some=C2=A0 time=C2=A0 ago=C2=A0 , due to the=C2=A0 lack=C2=A0 o= f=C2=A0 =0Aionisation =0A=0AG.. =0A=0A=0A =0AFrom: M0FMT =0ASent: Monday,= June 25, 2012 10:02 PM =0ATo: rsgb_lf_group@blacksheep.org =0ASubject: Re= : LF: SDR programs =0A =0AHi Graham =0A=C2=A0 =0A=C2=A0 =0A............ to = monitor off frequency nets and the tower/aircraft =0Asplit............... ?= there is no split frequency working the Tower and =0AA/C both use the=C2= =A0same QRG its just that the A/C being at altitude=C2=A0can =0Abe heard th= e Tower being low and beyond your radio horizon can not be =0Aheard........= if thats what you ment. =0A=C2=A0 =0AI use the say (A) LO for Approach and= then say (B)=C2=A0LO for Tower =0Aso when the hand over from Approach to T= ower occures I merely click the =0Aappropriate LO=C2=A0A or B. Usually a 3 = to 4 meg shift, well it is at Luton AP =0Aanyway. =0A=C2=A0 =0ASorry wrong = end of the spectrum for this reflector........ just as =0Awell the RSGB att= ention is with the Yahoo mess otherwise we may be getting our =0Akeying fin= gers rapped!!!!!!=0A =0A73 es GL Pete M0FMT IO91UX=0A=0A=0A________________= ________________=0AFrom: Graham =0A=0ATo: rsgb_lf_= group@blacksheep.org =0ASent: Monday, 25 June 2012, =0A21:19=0ASubject: Re:= LF: SDR =0Aprograms=0A=0A=0AYes I think=C2=A0 Andy=C2=A0 gave a talk=C2=A0= at the=C2=A0 egham=C2=A0 =0Aconvention=C2=A0 on using=C2=A0=C2=A0 a/d=C2= =A0 from=C2=A0 mobile=C2=A0 phones , =0Athe=C2=A0 new=C2=A0 ones had the=C2= =A0 extra=C2=A0 bits=C2=A0 to=C2=A0 give =0Athe=C2=A0 full=C2=A0 dynamic=C2= =A0 range on=C2=A0 HF ..he=C2=A0 was=C2=A0 =0Ausing=C2=A0=C2=A0 hardware=C2= =A0 block=C2=A0 convertors ......... never=C2=A0 =0Asaw=C2=A0 any=C2=A0 ite= ms=C2=A0 offered=C2=A0 for=C2=A0 sale=C2=A0 =0A........only=C2=A0 some=C2= =A0 very=C2=A0 high price=C2=A0 'HF rx'=C2=A0 =0Ausing=C2=A0 the=C2=A0 same= =C2=A0 ideas=C2=A0 ...I think=C2=A0 the=C2=A0 =0Agive=C2=A0 away=C2=A0 is= =C2=A0 the=C2=A0 band=C2=A0 being=C2=A0 covered in =0Afrequency=C2=A0=C2=A0= blocks , which I assume=C2=A0 is=C2=A0 down to=C2=A0 =0Athe=C2=A0 down=C2= =A0 convertors =0A=0ADont=C2=A0 think=C2=A0 he is=C2=A0 monitoring=C2=A0 B= S now , or=C2=A0 =0Awe=C2=A0 might=C2=A0 of=C2=A0 got the=C2=A0 fill=C2=A0 = in, but=C2=A0 one =0Athings=C2=A0 is=C2=A0 certain, the =C2=A310 , wonder-d= ongle=C2=A0 has=C2=A0 =0Asaved=C2=A0 me=C2=A0 from=C2=A0 buying=C2=A0 a=C2= =A0 R7000 ...All we=C2=A0 =0Aneed=C2=A0 now=C2=A0 is=C2=A0 a=C2=A0 little= =C2=A0 more=C2=A0 stability=C2=A0 in =0Athe=C2=A0=C2=A0 control=C2=A0 softw= are=C2=A0 and=C2=A0 a=C2=A0 wide-band=C2=A0 FM option in=C2=A0 HDSDR=C2=A0 = =0A=0AIm getting the=C2=A0 gb3ang=C2=A0=C2=A0 beacon=C2=A0 on=C2=A0 70 Mhz= =C2=A0 =0Agood=C2=A0 signal=C2=A0 with=C2=A0 my indoor=C2=A0=C2=A0 2 ele=C2= =A0 quad =0A.......... the=C2=A0 PMR band=C2=A0 on=C2=A0 446 Mhz=C2=A0 with= the=C2=A0 =0Aco-linera=C2=A0 from=C2=A0 10 miles away in liverpool=C2=A0 s= sb on 144 MHz=C2=A0 =0Aetc=C2=A0 =0A=0ADefinable=C2=A0 FM-AFC=C2=A0 (AND= =C2=A0 AM) =C2=A0=C2=A0 would be handy=C2=A0 to=C2=A0 monitor=C2=A0 off=C2= =A0 =0Afrequency=C2=A0 nets=C2=A0 and the=C2=A0 tower/aircraft=C2=A0=C2=A0 = split =0A=0AI think=C2=A0 possible=C2=A0 the=C2=A0 driver=C2=A0 software= =C2=A0 =0Acould=C2=A0 improve=C2=A0 as=C2=A0 more=C2=A0 take=C2=A0 up=C2=A0= the=C2=A0 =0Aidea=C2=A0 ....... could=C2=A0 HDSDR have=C2=A0 its=C2=A0 own= =C2=A0 driver=C2=A0 =0Acode=C2=A0 block=C2=A0 .......... Ive=C2=A0 noticed = there=C2=A0 is a=C2=A0 =0Aroutine=C2=A0 that=C2=A0 some=C2=A0 times=C2=A0 a= ppears=C2=A0 that=C2=A0 =0A'purges'=C2=A0 the=C2=A0 device=C2=A0 ......now= =C2=A0 if that=C2=A0 could=C2=A0 =0Abe=C2=A0 run at=C2=A0=C2=A0 will=C2=A0 = , that=C2=A0 would=C2=A0 be a big=C2=A0 =0Ahelp, to=C2=A0 recover=C2=A0 a= =C2=A0 locked=C2=A0=C2=A0 system =0A=0A73 -G.=0A =0AFrom: M0FMT =0ASent: = Monday, June 25, 2012 8:58 PM =0ATo: rsgb_lf_group@blacksheep.org =0ASubje= ct: Re: LF: SDR programs =0A =0AHi Bob =0A=C2=A0 =0AIf you are directing th= at mail to me then you need to look at earlier =0Aposts. =0A=C2=A0 =0AHowev= er if you are a cheque book Ham then it will be of little =0Ainterest to yo= u. =0A=C2=A0 =0AYou say dangle we say dongle..... :-0 =0A=C2=A0 =0AThese a= re TV front ends that use the SDR principle and plug straight =0Ainto your = USB port on your Lap top. Normally they are for recieving local =0Adigital = TV and radio plus a FM band as well. They are available in the US and =0Ath= ey can be made to tune from about 60megs to about 1.7gigs. If=C2=A0I need t= o =0Atell you more please ask but this is all in public domain on the web (= but not in =0AHam mags, at least not in UK). I have played with these thing= s for about 6 =0Amonths now=C2=A0and for a few quid (dollars) are fun. If y= ou build a simple up =0Aconverter with a say a 60meg LO guess what, you hav= e an all band=C2=A0HF radio =0Aas well. =0A=C2=A0 =0AOh and BTW I was not e= ntirely sure what Tracy was getting at below?? =0AWe are talking 10 dollars= not 300+dollars. =0A=C2=A0 =0A73 es GL Pete M0FMT IO91UX=0A =0A=0A________= ________________________=0AFrom: "riese-k3djc@juno.com" =0ATo: rsgb_lf_group@blacksheep.org =0ASent: Monday, 25 June 2012, =0A19= :34=0ASubject: Re: LF: SDR =0Aprograms=0A=0A=0A=EF=BB=BF =0A=0A=0ABeen Kin= da out of any loop on this=C2=A0=C2=A0 =0A=0ABUT =0A=0Aif what I read,, if= I connect a TV tuner usb dangle witht he correct chip =0Aset =0Ait will co= ver MF to HF using=C2=A0 an appropriate program. I use HDSDR with =0Amy SDR= IQ =0Awhich I like for general reception. So by using the proper chip set = =0AHDSDR =0Awill run that TV dangle=C2=A0as a HF radio =0A=0A?? =0A=0ABob K= 3DJC =0A=0AOn Thu, 21 Jun 2012 22:31:00 +0100 "Tracey Gardner" =0Awrites: =0AHello Pete =0A>=0A>If we're talking about l= ow priced SDRs, there is a relatively new kid on the block in the form of = the Afedri SDR-Net from Israel. =0A>It is what I will refer to as a "proper= " SDR i.e. a direct sampling digital down conversion SDR. =0A>It covers 10= 0kHz to 30MHz, has a maximum bandwidth of 1.25MHz and has a LAN interface = for remote access. =0A>The best bit is that it costs just over =C2=A3200 in= c shipping and VAT. =0A>=0A>You can find more details here =0A>=0A>http://4= z5lv.net/index.php/afedri-sdr-net-description =0A>=0A>https://www.box.com/s= /1cd9353fa35b1022925e =0A>=0A>I've no connection other than being a satisfi= ed customer. =0A>=0A>73s Tracey G5VU =0A>----- Original Message ----- =0A= >>From: M0FMT =0A>>To: rsgb_lf_group@blacksheep.org =0A>>Sent: Thursday, = June 21, 2012 9:55 PM =0A>>Subject: Re: LF: SDR programs =0A>>=0A>> =0A>>Hi= Mal =0A>>=0A>>The whole reason these things are getting so much attention = is the price and the fact they are independent of a sound card or=C2=A0A/D= converter.=C2=A0They are not really suitable for or give any advantage on= LF because you need an up converter in front. A Softrock SDR with a good = sound card will out perform these sticks at MF/LF.IMHO=C2=A0I don't think = its worth persuing to be honest. However I think with the DVB-T sticks peo= ple have been opening them up to look at the SMT chip marking if not sure.= It looks like they don't erase the markings like some well known LF TX su= ppiers do. Oh and the software plug-ins are only for the RTL2832 chipset.= =0A>> =0A>>73 es GL Pete M0FMT IO91UX=0A>>=0A>>=0A>>_______________________= _________=0A>> =0A> ---1613889061-1868787260-1340669298=:70238 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi Graham
 
OK a subtle point AM is a "Tran= sparent" mode FM is a "Capture" mode and as such not suitable for AC use wh= ere simultaneous transmission c= an block calls. Small random offsets in carrier frequency cause hetrodynes&= nbsp;that alert ATC of the presents of a weaker call. Nothing in Marine is = ever that immediate so I guess = it was expedient to opt for the El-Cheapo FM solution there can be no other= reason. Probably a bunch of Civil Servants were conned into believing AM s= tood for Ancient Modulation.
 
You are right there are = lot of extras that could be added to SDR software and perfectly feasible we just need to learn to pr= ogramme and add all the goodies we think are needed or find a friendly soft= ware jockey to do it for us...... hee!
 =
As far as up converters go the ubiquitous chip is the multiplex FST3253 used in Softrock = and other well known up-converters for RX an= d TX switched with a 90 degree phase shift LO from a pair of 7474 flip= flops is the basis for most current SDR detectors or TX mixers. There are = now relatively cheap A/D converters which give a wider BW than the are curr= ently available Sound Card solution. And now its all being integrated onto = a single IC so your comment earlier about a USB stick TX is with us. It jus= t needs a mass market for the price to come right down and I gues= s it comes through the Mobile Phone market. 
 
Big bang does= n't frighten me all bottles here matey retro shack thermionic not thermonuclear.
 
<= div>You'll be telling me next that the Moons gravity bends light ergo radio= waves?
 
It's late!!!
 
 
73 es GL Pete M0FMT IO91UX=
From: Graham <g8fzk@g8fzk.fsnet.co.uk>
= To: rsgb_lf_group@blacksheep.org <= br> Sent: Monday, 25 June = 2012, 23:38
Subject: R= e: LF: SDR programs

=0A=0A =0A =0A
=0A=
R Pete
=0A
 
=0A
Ahh   By  spli= t , I mean the  anti-jam   =0Ain channel  split&nb= sp; , When  on the  same  frequency, =0Athe  ground&nbs= p; TX  (used tobe ?)   off  set  =0Afrom the = aircraft  Tx  frequency  , so  if =0Athe  Ai= rcraft TX jammed  'ON' then  other  aircraft  =0Acould&= nbsp; still  receive  the  ground   , that  =0Awas=   the  reason  for  wide  IF pass  bands =0Aa= nd  keeping  to AM  for the  comm.'s ....  =0AMari= ne  coms  , adopted  FM ...
=0A
 
=0AThere is a  afc  for  cw
=0A
 
=0A
=  
=0A
OT ?  over the  top  more like ,  t= he  disclaimer =0Aon the  yab-a-dab-a-doo  group   = ; is bigger  than =0Athe  space  left  for the  me= ssages , I think the  =0Aname  Black-Sheep  seems  to&n= bsp; be  quite  apt  =0Anow  !,
=0A
 =0A
Big-bang  , according  to  my  arrl  ha= nd  =0Abook , HF communications  will  tend to  be = ; =0Aattenuated  in the  direction  of the  burst = , =0Aassume  by  producing  quite  a big  =0AFari= day   screen , also  recommends  you  keep  = =0Ayour  radio  in a  metal  sweet tin ala   = blue =0Apeter  garden ! 
=0A
 
=0A
Did&nb= sp; get  good  signals  on the  MW on the  =0Away&= nbsp; to  work  from  France  during  the  = =0Aeclipse some  time  ago  , due to the  lack  of=   =0Aionisation
=0A
 
=0A
G..
=0A
&nb= sp;
=0A
=0A

=0A
=0A
From: M0FMT <= /div>=0A
Sent: Monday, June 25, 2012 10:02 PM
=0A=0A
Subject: Re: LF: SDR program= s
=0A

=0A
=0A
Hi Graham
=0A
 
=0A
 
=0A
........= .... to monitor off frequency nets and the tower/aircraft =0Asplit..= ............. ? there is no split frequency working the Tower and =0AA/C bo= th use the same QRG its just that the A/C being at altitude can = =0Abe heard the Tower being low and beyond your radio horizon can not be = =0Aheard........ if thats what you ment.
=0A
&= nbsp;
=0A
I use the say (A) LO for Approach and then say (B)=  LO for Tower =0Aso when the hand over from Approach to Tower occures = I merely click the =0Aappropriate LO A or B. Usually a 3 to 4 meg shif= t, well it is at Luton AP =0Aanyway.
=0A
 = ;
=0A
Sorry wrong end of the spectrum for this reflector....= .... just as =0Awell the RSGB attention is with the Yahoo mess otherwise we= may be getting our =0Akeying fingers rapped!!!!!!
=0A
73 es GL Pete M0FMT IO91UX
= =0A
=0A
=0A
=0A<= div style=3D"margin: 5px 0px; padding: 0px; border: 1px solid rgb(204, 204,= 204); height: 0px; line-height: 0; font-size: 0px;" class=3D"yiv910073512h= r">
From: Graham =0A&= lt;g8fzk@g8fzk.fsnet.co.uk>
To:= rsgb_lf_group@blacksheep.org =0A
Sent: Monday, 25 June 2012, =0A21:19
Subject: Re: LF: SDR =0Aprograms

=0A =0A
=0A
=0A
Yes I think&n= bsp; Andy  gave a talk  at the  egham  =0Aconvention&nb= sp; on using   a/d  from  mobile  phones , =0Athe&= nbsp; new  ones had the  extra  bits  to  give =0A= the  full  dynamic  range on  HF ..he  was  = =0Ausing   hardware  block  convertors ......... never&= nbsp; =0Asaw  any  items  offered  for  sale = =0A........only  some  very  high price  'HF rx' = =0Ausing  the  same  ideas  ...I think  the = =0Agive  away  is  the  band  being  covered= in =0Afrequency   blocks , which I assume  is  down to=   =0Athe  down  convertors
=0A
 
=0ADont  think  he is  monitoring  BS now , or  =0Aw= e  might  of  got the  fill  in, but  one =0A= things  is  certain, the =C2=A310 , wonder-dongle  has = =0Asaved  me  from  buying  a  R7000 ...All we&nb= sp; =0Aneed  now  is  a  little  more  stabil= ity  in =0Athe   control  software  and  a&nb= sp; =0Awide-band  FM option in  HDSDR 
= =0A
 
=0A
Im getting the  gb3ang   beacon&= nbsp; on  70 Mhz  =0Agood  signal  with  my indoor=    2 ele  quad =0A.......... the  PMR band  on&nbs= p; 446 Mhz  with the  =0Aco-linera  from  10 miles away= in liverpool  ssb on 144 MHz  =0Aetc 
=0A
 <= /div>=0A
Definable  FM-AFC  (AND  AM) = =0A   would be handy  to  monitor  off  = =0Afrequency  nets  and the  tower/aircraft   spli= t
=0A
 
=0A
I think  possible  the  = driver  software  =0Acould  improve  as  more = ; take  up  the  =0Aidea  ....... could  HDSDR hav= e  its  own  driver  =0Acode  block  ........= .. Ive  noticed there  is a  =0Aroutine  that  som= e  times  appears  that  =0A'purges'  the  de= vice  ......now  if that  could  =0Abe  run at&nbs= p;  will  , that  would  be a big  =0Ahelp, to&nbs= p; recover  a  locked   system
=0A
 =0A
73 -G.
=0A
=0A
=0A
From: M0FMT
=0A
Sent: Monday, June 2= 5, 2012 8:58 PM
=0A=0A
Subject: Re: LF: SDR programs
=0A

=0A
=0A
Hi Bob
=0A
=  
=0A
If you are directing that mail to me then you nee= d to look at earlier =0Aposts.
=0A
 =0A
However if you are a cheque book Ham then it will be of litt= le =0Ainterest to you.
=0A
 
=0AYou say dangle we say dongle..... :-0
=0A
 
=0A
These are TV front ends that use the SDR prin= ciple and plug straight =0Ainto your USB port on your Lap top. Normally the= y are for recieving local =0Adigital TV and radio plus a FM band as well. T= hey are available in the US and =0Athey can be made to tune from about 60me= gs to about 1.7gigs. If I need to =0Atell you more please ask but this= is all in public domain on the web (but not in =0AHam mags, at least not i= n UK). I have played with these things for about 6 =0Amonths now and f= or a few quid (dollars) are fun. If you build a simple up =0Aconverter with= a say a 60meg LO guess what, you have an all band HF radio =0Aas well= .
=0A
 
=0A
Oh and BTW I w= as not entirely sure what Tracy was getting at below?? =0AWe are talking 10= dollars not 300+dollars.
=0A
 
=0A<= div>73 es GL Pete M0FMT IO91UX
=0A
=0A
=0A
=0A
=0A
From: =0A"riese-k3djc@juno.com" <riese-k3= djc@juno.com>
To: rs= gb_lf_group@blacksheep.org =0A
Sen= t: Monday, 25 June 2012, =0A19:34
Subject: Re: LF: SDR =0Aprograms

= =0A
=EF=BB=BF =0A=0A=0A
=0A
=  
=0A
Been Kinda out of any loop on this  
= =0A
 
=0A
BUT
=0A
 
=0A
if what I = read,, if I connect a TV tuner usb dangle witht he correct chip =0Aset=0A
it will cover MF to HF using  an appropriate program. I use H= DSDR with =0Amy SDR IQ
=0A
which I like for general reception. So = by using the proper chip set =0AHDSDR
=0A
will run that TV dangle&= nbsp;as a HF radio
=0A
 
=0A
??
=0A
 <= /div>=0A
Bob K3DJC
=0A
 
=0A
On Thu, 21 Jun 2012= 22:31:00 +0100 "Tracey Gardner" <tracey.gardner@talktalk.net> =0Awrites:
=0A=0A
Hello Pete
=0A
 
=0A
If we're talkin= g about low priced SDRs, there is a relatively new kid on =0A the block in= the form of the Afedri SDR-Net from Israel.
=0A
It is what I wi= ll refer to as a "proper" SDR i.e. a direct sampling =0A digital down conv= ersion SDR.
=0A
It covers 100kHz to 30MHz, has a maximum bandwid= th of 1.25MHz and has a =0A LAN interface for remote access.
=0A The best bit is that it costs just over =C2=A3200 inc shipping and VAT.=0A
 
=0A
You can find more details here
=0A=
 
=0A =0A
 
=0A =0A  
=0A
I've no connection other than being a satisfied cus= tomer.
=0A
 
=0A
73s Tracey G5VU
=0A =0A
----- =0A Origin= al Message -----
=0A
From: =0A M0FMT
=0A =0A
Sent:<= /b> =0A Thursday, June 21, 2012 9:55 PM
=0A
Subjec= t: =0A Re: LF: SDR programs
=0A

=0A
=0A
Hi Mal
=0A
 
=0A
The whole reason these= things are getting so much attention is the =0A price and the fact they= are independent of a sound card or A/D =0A converter. They ar= e not really suitable for or give any advantage on LF =0A because you ne= ed an up converter in front. A Softrock SDR with a good sound =0A card w= ill out perform these sticks at MF/LF.IMHO I don't think its =0A wo= rth persuing to be honest. However I think with the DVB-T sticks people =0A= have been opening them up to look at the SMT chip marking if not sure. = It =0A looks like they don't erase the markings like some well known LF = TX suppiers =0A do. Oh and the software plug-ins are only for the RTL283= 2 chipset.
=0A
73 es GL Pete M0FMT IO91UX
=0A
=0A =
=0A
=0A =
<= /div>
=0A
 


=0A=0A

=0A


 
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