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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  Cozy Cave still cheaper?????? that's with all the UK Tax (support UK!!!)   Newsky TV28T RTL 2832U / R820T DVB-T DAB FM SDR stick only Your shopping basket contains 1 product Product Description Ref. Avail. Unit price Qty Total Total products (incl. tax): £7.95 Total shipping (incl. tax): £1.98 Total (excl. tax): £9.93 Total tax: £0.00 Total (incl. tax) £9.93  https://www.cosycave.co.uk/product.php?id_product=288 [...] 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 [77.238.189.63 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 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid 1.0 FREEMAIL_REPLYTO Reply-To/From or Reply-To/body contain different freemails 0.0 T_REMOTE_IMAGE Message contains an external image X-Scan-Signature: cd6a033b882a3f3e6eb18bb96c3ddcbc Subject: LF: =?utf-8?B?UmU6IExGOiBSZTogwqMxMCBEb25nZWwtU0RSICBEaXJlY3Qgc2FtcGxlIG9u?= =?utf-8?B?IDUwNCBLSHogLSBTL04gIFRFU1Qg?= Content-Type: multipart/alternative; boundary="-1690458260-569451494-1365346650=:26115" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_FONTCOLOR_BLUE, 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-AUTHENTICATION: mtain-md05.r1000.mx.aol.com ; domain : yahoo.co.uk DKIM : fail x-aol-sid: 3039ac1d605951618fc9118e X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ---1690458260-569451494-1365346650=:26115 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Graham=0A=C2=A0=0ACozy Cave still cheaper??????=C2=A0 that's with all th= e UK Tax (support UK!!!)=0A=C2=A0=0A=C2=A0=0ANewsky TV28T RTL 2832U / R820T= DVB-T DAB FM SDR stick only=0AYour shopping basket contains 1 product=0APr= oduct=0ADescription=0ARef.=0AAvail.=0AUnit price=0AQty=0ATotal=0ATotal prod= ucts (incl. tax): =C2=A37.95 =0ATotal shipping (incl. tax): =C2=A31.98 =0AT= otal (excl. tax): =C2=A39.93 =0ATotal tax: =C2=A30.00 =0ATotal (incl. tax= ) =C2=A39.93 =0A=C2=A0=0Ahttps://www.cosycave.co.uk/product.php?id_product= =3D288=0A=0A=0A73 es GL Pete M0FMT IO91UX=0A=0A=0A>________________________= ________=0A> From: Graham =0A>To: rsgb_lf_group@bl= acksheep.org =0A>Sent: Sunday, 7 April 2013, 15:08=0A>Subject: Re: LF: Re: = =C2=A310 Dongel-SDR Direct sample on 504 KHz - S/N TEST =0A> =0A>=0A> = =0A>Looking=C2=A0 =0Aat=C2=A0 ebay=C2=A0 , one=C2=A0 seller=C2=A0 has=C2=A0= the=C2=A0=C2=A0=C2=A0 RTL2832U & R820T=C2=A0 dongle=C2=A0 and=C2=A0 =0Aind= icates=C2=A0=C2=A0 25=C2=A0 to 1700 MHz range=C2=A0 , using=C2=A0 the=C2=A0= =0Ar820t=C2=A0=C2=A0 in place of the=C2=A0 e4000=C2=A0=C2=A0 front=C2=A0 e= nd=C2=A0 =0A.....Item number: 160896097557 =0A>This=C2=A0 is=C2=A0 'handy= =C2=A0 as the=C2=A0 =0Aoriginal=C2=A0 chip set items=C2=A0 are becoming=C2= =A0 difficult=C2=A0 to=C2=A0 =0Asource=C2=A0 and=C2=A0 over=C2=A0 priced=C2= =A0 !=C2=A0 =0A>=0A>Defiantly=C2=A0 the=C2=A0 green=C2=A0 light =0Ato=C2= =A0=C2=A0 hack the=C2=A0 original=C2=A0 for=C2=A0 MF/HF and=C2=A0 buy=C2=A0= =0Athe=C2=A0 new=C2=A0 for=C2=A0 vhf/shf =0A>=0A>73's Graham =0A>=C2=A0 = =0A>=0A> =0A>From: Minto Witteveen =0A>Sent: Sunday, April 07, 2013 9:33 A= M =0A>To: rsgb_lf_group@blacksheep.org =0A>Subject: LF: Re: =C2=A310 Donge= l-SDR Direct sample on 504 KHz - S/N TEST =0A>=0A> =0A>Hi Graham, =0A>Yes = I have the slider set to (nearly) maximum on 2 and 70 J=0A>With a direct co= mpare (same antenna, same signal) the dongle is =0Adefinitely less sensitiv= e than my 897, I suspect (but have not scientifically =0Adetermined) at lea= st several s-points. I only tested NFM. Other dongle owners =0Ahere report = the same so it is not an issue with my copy of the =0Adongle=E2=80=A6 =0A>7= 3=E2=80=99s Minto pa3bca =0A>=0A>------------------------------------------= --------------------------------=0A>Ceterum =0Acenseo Carthaginem delendam = esse=0A> =0A>=0A>From: Graham =0A>Sent: Sunday, April 07, 2013 02:00 =0A>T= o: rsgb_lf_group@blacksheep.org =0A>Subject: Re: LF: Re: =C2=A310 Dongel-S= DR Direct sample on 504 KHz - S/N =0ATEST =0A> Ok...Minto, =0A>=0A>- sill= y=C2=A0 question=C2=A0 , you=C2=A0 have=C2=A0 the=C2=A0 gain slider =0Aset= =C2=A0 max in the=C2=A0 driver set-up panel ?=C2=A0 Then agen , my=C2=A0 = =0Aft897=C2=A0 could=C2=A0 be=C2=A0 u/s=C2=A0 !=C2=A0 =0A>=0A>I will=C2=A0= shorten the=C2=A0 min coax=C2=A0 I=C2=A0 have=C2=A0 soldered =0Ato the=C2= =A0 device=C2=A0 , and=C2=A0 see=C2=A0 what=C2=A0 happens=C2=A0 on =0AVHF= =C2=A0 with the=C2=A0 gen on Sunday =0A>with the=C2=A0 same=C2=A0 levels= =C2=A0 , ive=C2=A0 emailed=C2=A0 you=C2=A0 =0Aa=C2=A0 recording=C2=A0 of=C2= =A0 ssb=C2=A0=C2=A0 station=C2=A0 on 4=C2=A0 =0Ameters=C2=A0 , using=C2=A0 = the=C2=A0 dongle=C2=A0 and=C2=A0 indoor=C2=A0 Ae =0A>=0A>73 -G,. =0A>=0A>= =0A>=0A>=0A>=0A>=0A>From: Minto Witteveen =0A>Sent: Saturday, April 06, 20= 13 11:16 PM =0A>To: rsgb_lf_group@blacksheep.org =0A>Subject: LF: Re: =C2= =A310 Dongel-SDR Direct sample on 504 KHz - S/N TEST =0A>=0A>Hi Graham, = =0A>So maybe I should order another (type) of RTL2832 dongle. The one I =0A= have certainly is wayyy less sensitive than my ft897 on 2 and 70. Probably = the =0Atype of tuner is different.=0A>Well for the direct sampling test it = is =0Airrelevant. I will have to filter 472, but that is no problem as I al= ready have =0Asuch a filter (ft817 will overload from AM@675 without the fi= lter).=0A>I also have a 1.8 MHz =0Ahigpass.=C2=A0 And as you say, at EUR 10= for a dongle there is not much to =0Acomplain about. It is fascinating tha= t it works so well as it =0Adoes. =0A>73=E2=80=99s Minto pa3bca =0A>=0A>---= -----------------------------------------------------------------------=0A>= Ceterum =0Acenseo Carthaginem delendam esse=0A> =0A>=0A>From: Graham =0A>S= ent: Saturday, April 06, 2013 23:58 =0A>To: rsgb_lf_group@blacksheep.org = =0A>Subject: Re: LF: Re: =C2=A310 Dongel-SDR Direct sample on 504 KHz - S/N= =0ATEST =0A> Ok=C2=A0 Minto =0A>=0A>Yes this=C2=A0 is the=C2=A0 Q not Q = or=C2=A0 what=C2=A0 ever=C2=A0 =0Aconnection=C2=A0 to the=C2=A0 A/d=C2=A0 = =0A>=0A>http://mikikg.files.wordpress.com/2012/08/rtl2832u-dc-mods.pdf =0A>= =0A>As to improvement's=C2=A0 , ive no idea=C2=A0 ! ,=C2=A0=C2=A0 but you= =C2=A0 =0Anote the=C2=A0=C2=A0 coupling=C2=A0=C2=A0 C=C2=A0 are=C2=A0 both= =C2=A0 removed , =0Athe=C2=A0 gain from the=C2=A0 mini-whip=C2=A0 my=C2=A0 = well=C2=A0 be=C2=A0 =0Aenough to=C2=A0 'tip the=C2=A0 balance'=C2=A0 but=C2= =A0=C2=A0 s/n=C2=A0 =0Afor=C2=A0 data=C2=A0 is=C2=A0 more=C2=A0 important= =C2=A0 than=C2=A0 'peak signal =0Alevel'=C2=A0=C2=A0 so=C2=A0 gain (lots)= =C2=A0 may=C2=A0 not be the=C2=A0 =0Aholy=C2=A0 grail , I did=C2=A0 copy=C2= =A0 nav text=C2=A0 at 100% from the=C2=A0 =0Asouth=C2=A0 of=C2=A0 Uk , audi= o=C2=A0 level=C2=A0 was=C2=A0 very low , but=C2=A0 =0Aat a=C2=A0 good s/n.= =C2=A0 =0A>=0A>[ Gary's=C2=A0 point , yes could=C2=A0 switch , but=C2=A0 I= have the=C2=A0 =0Aimpression , more=C2=A0 could=C2=A0 be=C2=A0 gained=C2= =A0 by=C2=A0 using=C2=A0 =0Athe=C2=A0 balanced=C2=A0 feed=C2=A0 as=C2=A0 in= the=C2=A0 link above , you=C2=A0 =0Acan=C2=A0 run=C2=A0 2=C2=A0 dongles=C2= =A0 in=C2=A0 the=C2=A0 same=C2=A0 pc=C2=A0 =0Aas=C2=A0 the=C2=A0 usb=C2=A0 = location=C2=A0 seems=C2=A0 to=C2=A0 be=C2=A0 part =0Aof the=C2=A0 driver=C2= =A0 addressing =0A>=0A>There=C2=A0 is=C2=A0 'no'=C2=A0 gain in the=C2=A0 A= /D , to=C2=A0 day=C2=A0 =0A, the=C2=A0=C2=A0 racal=C2=A0 ra6790=C2=A0 produ= ced=C2=A0 a=C2=A0 S3 / 4=C2=A0 =0Acw=C2=A0 copy=C2=A0 from=C2=A0 0.1 uV=C2= =A0 , as=C2=A0 can be=C2=A0 seen from =0Athe=C2=A0 s-lab shot , but=C2=A0 a= low noise=C2=A0 pre-amp=C2=A0 would=C2=A0 =0Asolve the=C2=A0 problem and= =C2=A0 with=C2=A0 no=C2=A0=C2=A0 additional=C2=A0 =0Amixer=C2=A0 , IMD shou= ld=C2=A0 be=C2=A0=C2=A0 much=C2=A0 reduced=C2=A0 , night =0Atime=C2=A0 HF w= as=C2=A0 quite=C2=A0 reasonable , left=C2=A0 it=C2=A0 =0Aon=C2=A0=C2=A0 14,= 103=C2=A0 with the=C2=A0 40ft=C2=A0 vertical, returned=C2=A0 =0Aafter=C2=A0= dinner=C2=A0 and=C2=A0=C2=A0 had missed=C2=A0 Iceland=C2=A0 =0Awith=C2=A0 = -8dB=C2=A0 signal .. typical !=C2=A0=C2=A0 =0A>=0A>The=C2=A0 mixer=C2=A0 i= n=C2=A0 the=C2=A0 dongle=C2=A0 cannot=C2=A0 =0Ahave=C2=A0 much=C2=A0 dynami= c=C2=A0 range=C2=A0 , compared to one=C2=A0 =0Adesigned=C2=A0 for=C2=A0 'HF= =C2=A0=C2=A0 , eg=C2=A0 the=C2=A0 ra1769=C2=A0 =0Afirst=C2=A0 mixer=C2=A0 i= s fed=C2=A0 with=C2=A0=C2=A0 5=C2=A0 to 7 watts=C2=A0 =0Aof=C2=A0 RF to=C2= =A0 ensure minimal=C2=A0 transit=C2=A0 times=C2=A0 and=C2=A0 =0Aover=C2=A0 = 120 dB=C2=A0 dynamic=C2=A0 range ,=C2=A0 this=C2=A0 could=C2=A0 =0Abe=C2=A0= a contributing factor=C2=A0 to=C2=A0 any=C2=A0 'strange patterns=C2=A0 =0A= , which=C2=A0 must=C2=A0 be=C2=A0 aggravated=C2=A0 by=C2=A0 having=C2=A0 = =0Atwo=C2=A0 mixers=C2=A0 in the=C2=A0 rf=C2=A0 path=C2=A0 -=C2=A0 one may= =C2=A0 =0Abe=C2=A0 'good'=C2=A0 but=C2=A0 the=C2=A0 e4000=C2=A0=C2=A0 may= =C2=A0 not=C2=A0 =0Abe , where=C2=A0 as=C2=A0 the=C2=A0 a/d=C2=A0 seems=C2= =A0 to=C2=A0 be=C2=A0 =0Aquite=C2=A0 clean =0A>=0A>You have the=C2=A0 same= =C2=A0 item I have=C2=A0 hacked=C2=A0 for=C2=A0 MF , =0Ashowing=C2=A0 in th= e=C2=A0 driver=C2=A0 list as=C2=A0 generic , the=C2=A0 =0Aother=C2=A0 is th= e=C2=A0 original ezeycap=C2=A0 as per the=C2=A0 first=C2=A0 =0Aposts=C2=A0 = ... When=C2=A0 you=C2=A0 say=C2=A0 the=C2=A0 vhf/uhf=C2=A0 is=C2=A0 =0A'low= '=C2=A0 that's=C2=A0 odd=C2=A0 as=C2=A0 I would=C2=A0 say=C2=A0 this=C2=A0 = =0Aone=C2=A0 (ezy)=C2=A0 is=C2=A0 as=C2=A0 good=C2=A0 as the=C2=A0 ft897d o= n =0A2/70=C2=A0 and on 4=C2=A0 meters=C2=A0 , its=C2=A0 better=C2=A0 than t= he=C2=A0 =0Aspectrum=C2=A0 trans V=C2=A0 , using=C2=A0 HDSDR=C2=A0 =0A>=0A= >But=C2=A0 the=C2=A0 main thing=C2=A0 is , it=C2=A0 put's=C2=A0 a =0Areason= able=C2=A0=C2=A0 set-up=C2=A0=C2=A0 in a very=C2=A0 affordable=C2=A0 price = =0A, will=C2=A0 be=C2=A0 interesting=C2=A0 to=C2=A0 see=C2=A0 the=C2=A0 =0A= performance=C2=A0 ,D/S linked to the=C2=A0 mini-whip=C2=A0 ,=C2=A0 may be = =0Athe=C2=A0 only=C2=A0 way=C2=A0 round the=C2=A0 large=C2=A0 carrier=C2=A0= =0Aproblem=C2=A0 will=C2=A0 be=C2=A0=C2=A0 filtering=C2=A0 , or=C2=A0 a=C2= =A0 move =0Ato=C2=A0 a better=C2=A0 a/d=C2=A0 , at=C2=A0 least=C2=A0 any=C2= =A0 =0Apre-amps=C2=A0 and=C2=A0 filters=C2=A0 are=C2=A0 transferable=C2=A0 = , =0Ashould=C2=A0 a=C2=A0 better=C2=A0=C2=A0 A/D be=C2=A0 used=C2=A0 at=C2= =A0 a=C2=A0 =0Afuture=C2=A0 data=C2=A0 ? =0A>=0A>73 -G. =0A>=0A>=0A>=0A>= =0A>=0A>=0A>=0A>=0A>=0A>From: Minto Witteveen =0A>Sent: Saturday, April 06= , 2013 10:15 PM =0A>To: rsgb_lf_group@blacksheep.org =0A>Subject: LF: Re: = =C2=A310 Dongel-SDR Direct sample on 504 KHz - S/N TEST =0A>=0A>I have bee= n experimenting too with an RTL-SDR dongle now for a few =0Aweeks. I curren= tly use a transverter to listen to lf/mf/hf. This transverter =0Aupshifts t= he spectrum with 100 MHz.=0A>Although the RTL-DSR is rather deaf when =0Aus= ed on 2m or 70 cm (compared to my ham equipment) when used for HF it is =0A= sensitive enough with a pa0rdt active antenna.=0A>I can also use it on 472.= But =0Athere I have to use my 472 KHz narrow band filter to keep out mf, e= specially =0ARadio Mario @ 675 Khz. And although the dynamic range is not s= tellar, as far as =0AI can determine =C2=A0reception on 472 is =0Avery comp= arable to my ft817..=0A>Grahams pointer to the direct sampling option =0Ago= t me interested. Time to let the nice people from dealextreme send me anoth= er =0Aon for EUR 10 so I can =E2=80=98experiment=E2=80=99 with it. =0A>Some= =0Ainteresting websites/video=E2=80=99s about the direct sampling =0Aimple= mentation:=0A>http://ttrftech.tumblr.com/post/36283680013/rtl2832u-dongle-m= ods-for-7mhz-reception-with-gqrx=0A>and=0A>http://mikikg.wordpress.com/2012= /08/22/prepravka-dvb-t-usb-prijemnika-sa-rtl2832u-za-hf-0-28mhz/ =0A>First = site is in Japanese, second in Croatian, but Google =0A(translate) is your = friend. =0A>It is very nice to get an instant overview of 2 MHz of spectrum= . I =0Ahave been plagued by ever increasing QRM here, which forced me to pl= ace a =0Amagnetic loop antenna in my backyard to get any reception at all. = QRM now is =0AS9+10 dB form 100 KHz to nearly 50 MHz. I have not been able = to find out what =0Acauses this (not generated in my house). See attached s= creenshot for a part of =0Athe spectrum around 80 meters. This=C2=A0 wavy p= attern can be seen everywhere from nearly DC to 50 MHz, with some =0Aclean = area=E2=80=99s in between. Sometimes the QRM stops waving =E2=80=93 straigh= t lines for =0Aseveral seconds and then the waving restarts. =0A>I am very = jealous of other hams showing waterfall patters where =0Aeverything between= real signals is dark blue... :-( =0A>Anybody ANY idea what might cause thi= s kind of QRM? =0A>73=E2=80=99s Minto pa3bca =0A>=0A>---------------------= -----------------------------------------------------=0A>Ceterum =0Acenseo = Carthaginem delendam esse=0A> =0A>=0A>From: Gary - G4WGT =0A>Sent: Saturda= y, April 06, 2013 19:55 =0A>To: rsgb_lf_group@blacksheep.org =0A>Subject: = Re: LF: =C2=A310 Dongel-SDR Direct sample on 504 KHz - S/N TEST =0A> Graha= m, =0A>=C2=A0 =0A>Maybe then....if the PCB was installed in a small =0Aalum= inium box the capacitor could be removed & a switch fitted to select the = =0Aoriginal (VHF) arrangement or the HF/LF method. Possibly fit a pre-amp = =0Aalso. =0A>=C2=A0 =0A>73, Gary - G4WGT. =0A>=C2=A0 =0A>=C2=A0 =0A>=0A> ---1690458260-569451494-1365346650=:26115 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi Graham
 
Cozy Cave still cheaper??????&nbs= p; that's with all the UK Tax (support UK!!!)
 
 
3D"Newsky<= /a>
Newsky TV28= T RTL 2832U / R820T DVB-T DAB FM SDR stick only
Your shopping basket contains 1 product
Ref.= =
ProductDescriptionAva= il.Unit priceQtyTotal
Total products (in= cl. tax):=C2=A37.95
Total shipping (incl. t= ax):=C2=A31.98
=09=09=09=09=09=09=09=09=09=09= =09Total (excl. tax):=09=09=09=09=09=09=09=09=09=C2=A39.93
=09=09=09=09=09=09=09=09=09=09=09Total tax:=09=09=09= =09=09=09=09=09=09=C2=A30.00
=09=09=09=09=09=09=09= =09=09=09=09Total (incl. tax)=09=09=09=09=09=09=09=09=09=C2=A39.93
 
https://www.cosycave.co.uk/product= .php?id_product=3D288

73 es GL Pete M0FMT IO91UX
=
From: Graham <g8fzk@g8fzk.fsnet.co.uk>
= To: rsgb_lf_group@blacksheep.org
Sent: Sunday, 7 April 2013, 15:08
Subject: Re: LF: Re: =C2=A310 Dongel-SDR= Direct sample on 504 KHz - S/N TEST

=0A=0A =0A =0A=0A=0A
=0A
= =0A

Looking  =0Aat  ebay  , one  seller  has&nb= sp; the    =0ARTL2832U & R820T&n= bsp; dongle  and  =0Aindicates   25  to 1700 MHz r= ange  , using  the  =0Ar820t   in place of the&nbs= p; e4000   front  end  =0A.....= Item number: 160896097557

=0A
= This  is  'handy  as the  =0Aoriginal  chip set it= ems  are becoming  difficult  to  =0Asource  and&n= bsp; over  priced  ! 
=0A
 
=0A
Defiantly  the&n= bsp; green  light =0Ato   hack the  original  for&= nbsp; MF/HF and  buy  =0Athe  new  for  vhf/shf
=0A
 
=0A
73's Graham
=0A
 
=0A
=0A

<= /div>=0A
=0A
From:= Minto Witteveen =0A
Sent: Sunday, April 07, 2013 9:33 AM
=0A=0A
Subject: LF: Re: =C2=A310 Donge= l-SDR Direct sample on 504 KHz - S/N TEST =0A
=0A

=
=0A
=0A
=0A
=0A
H= i Graham,
=0A
Yes I ha= ve the slider set to (nearly) maximum on 2 and 70 =0AJ
Wi= th a direct compare (same antenna, same signal) the dongle is =0Adefinitely= less sensitive than my 897, I suspect (but have not scientifically =0Adete= rmined) at least several s-points. I only tested NFM. Other dongle owners = =0Ahere report the same so it is not an issue with my copy of the =0Adongle= =E2=80=A6
=0A
73=E2=80= =99s Minto pa3bca
=0A
 
=0A
--------= ------------------------------------------------------------------
Ceter= um =0Acenseo Carthaginem delendam esse
=0A
=0A
=0A=
From: Graham
=0A
Sent: Sunday, April = 07, 2013 02:00
=0A=0A
Subject: Re: LF: Re: =C2=A310 Dongel-SDR Direct sample on 504 KHz - S/= N =0ATEST
=0A
 
=0A
=0A
O= k...Minto,
=0A
 
=0A
- silly  question  ,= you  have  the  gain slider =0Aset  max in the  d= river set-up panel ?  Then agen , my  =0Aft897  could  = be  u/s  ! 
=0A
 
=0A
I will  s= horten the  min coax  I  have  soldered =0Ato the = device  , and  see  what  happens  on =0AVHF = ; with the  gen on Sunday
=0A
with the  same  leve= ls  , ive  emailed  you  =0Aa  recording  of&= nbsp; ssb   station  on 4  =0Ameters  , using = ; the  dongle  and  indoor  Ae =0A
=0A
 <= /div>=0A
73 -G,.
=0A
 
=0A
 
=0A
=  
=0A
 
=0A
=0A
 
=0A
=0A=0A
= Sent: Saturday, April 06, 2013 11:16 PM
=0A=0A
Subject: LF: Re: =C2=A310 Dongel-SDR Dire= ct sample on 504 KHz - S/N TEST =0A
=0A
 
= =0A
=0A
=0A
=0A
Hi Grah= am,
=0A
So maybe I sho= uld order another (type) of RTL2832 dongle. The one I =0Ahave certainly is = wayyy less sensitive than my ft897 on 2 and 70. Probably the =0Atype of tun= er is different.
Well for the direct sampling test it is =0Airrelevant. = I will have to filter 472, but that is no problem as I already have =0Asuch= a filter (ft817 will overload from AM@675 without the filter).
I also have= a 1.8 MHz =0Ahigpass.  And as you say, at EUR 10 for a dongle there i= s not much to =0Acomplain about. It is fascinating that it works so well as= it =0Adoes.
=0A
73=E2= =80=99s Minto pa3bca
=0A
 
=0A
-----= ---------------------------------------------------------------------
Ce= terum =0Acenseo Carthaginem delendam esse
=0A
=0A
=0A
 
=0A
= =0A
From: Graham
=0A
Sent: Saturday, A= pril 06, 2013 23:58
=0A=0A
Subject: Re: LF: Re: =C2=A310= Dongel-SDR Direct sample on 504 KHz - S/N =0ATEST
=0A 
=0A
=0A
Ok  Minto
=0A
 =
=0A
Yes this  is the  Q not Q or  what  ever&= nbsp; =0Aconnection  to the  A/d 
=0A
 
= =0A=0A 
=0A
As to improvement's  , ive no idea  ! ,&nb= sp;  but you  =0Anote the   coupling   C = ; are  both  removed , =0Athe  gain from the  mini-whip=   my  well  be  =0Aenough to  'tip the  balan= ce'  but   s/n  =0Afor  data  is  more&n= bsp; important  than  'peak signal =0Alevel'   so = gain (lots)  may  not be the  =0Aholy  grail , I did&n= bsp; copy  nav text  at 100% from the  =0Asouth  of&nbs= p; Uk , audio  level  was  very low , but  =0Aat a = ; good s/n. 
=0A
 
=0A
[ Gary's  point , = yes could  switch , but  I have the  =0Aimpression , more&nb= sp; could  be  gained  by  using  =0Athe  bal= anced  feed  as  in the  link above , you  =0Acan&= nbsp; run  2  dongles  in  the  same  pc = ; =0Aas  the  usb  location  seems  to  be&nb= sp; part =0Aof the  driver  addressing
=0A
 
= =0A
There  is  'no'  gain in the  A/D , to  da= y  =0A, the   racal  ra6790  produced  a = ; S3 / 4  =0Acw  copy  from  0.1 uV  , as  ca= n be  seen from =0Athe  s-lab shot , but  a low noise  = pre-amp  would  =0Asolve the  problem and  with  n= o   additional  =0Amixer  , IMD should  be &n= bsp; much  reduced  , night =0Atime  HF was  quite = ; reasonable , left  it  =0Aon   14,103  with the&= nbsp; 40ft  vertical, returned  =0Aafter  dinner  and&n= bsp;  had missed  Iceland  =0Awith  -8dB  signal .= . typical !  
=0A
 
=0A
The  mixer&n= bsp; in  the  dongle  cannot  =0Ahave  much  = dynamic  range  , compared to one  =0Adesigned  for&nbs= p; 'HF   , eg  the  ra1769  =0Afirst  mixer&n= bsp; is fed  with   5  to 7 watts  =0Aof  RF = to  ensure minimal  transit  times  and  =0Aover&n= bsp; 120 dB  dynamic  range ,  this  could  =0Abe&= nbsp; a contributing factor  to  any  'strange patterns = ; =0A, which  must  be  aggravated  by  having&nbs= p; =0Atwo  mixers  in the  rf  path  -  one m= ay  =0Abe  'good'  but  the  e4000   may=   not  =0Abe , where  as  the  a/d  seems&nbs= p; to  be  =0Aquite  clean
=0A
 
=0AYou have the  same  item I have  hacked  for  MF = , =0Ashowing  in the  driver  list as  generic , the&nb= sp; =0Aother  is the  original ezeycap  as per the  fir= st  =0Aposts  ... When  you  say  the  vhf/uh= f  is  =0A'low'  that's  odd  as  I would&nbs= p; say  this  =0Aone  (ezy)  is  as  good&nbs= p; as the  ft897d on =0A2/70  and on 4  meters  , its&n= bsp; better  than the  =0Aspectrum  trans V  , using&nb= sp; HDSDR 
=0A
 
=0A
But  the  main = thing  is , it  put's  a =0Areasonable   set-up&nb= sp;  in a very  affordable  price =0A, will  be  i= nteresting  to  see  the  =0Aperformance  ,D/S lin= ked to the  mini-whip  ,  may be =0Athe  only  way=   round the  large  carrier  =0Aproblem  will = ; be   filtering  , or  a  move =0Ato  a bett= er  a/d  , at  least  any  =0Apre-amps  and&n= bsp; filters  are  transferable  , =0Ashould  a  b= etter   A/D be  used  at  a  =0Afuture  = data  ?
=0A
 
=0A
73 -G.
=0A
 =0A
 
=0A
 
=0A
 
=0A
&nb= sp;
=0A
 
=0A
 
=0A
=0A
&nb= sp;
=0A=0A
Subject: LF: Re: =C2= =A310 Dongel-SDR Direct sample on 504 KHz - S/N TEST =0A
= =0A
 
=0A
=0A
=0A
=0A
I have been experimenting too with an RTL-SDR dongle now for a= few =0Aweeks. I currently use a transverter to listen to lf/mf/hf. This tr= ansverter =0Aupshifts the spectrum with 100 MHz.
Although the RTL-DSR is= rather deaf when =0Aused on 2m or 70 cm (compared to my ham equipment) whe= n used for HF it is =0Asensitive enough with a pa0rdt active antenna.
I = can also use it on 472. But =0Athere I have to use my 472 KHz narrow band f= ilter to keep out mf, especially =0ARadio Mario @ 675 Khz. And although the= dynamic range is not stellar, as far as =0AI can determine  reception on 472 is =0Avery comparable to my ft817..
Grahams pointer= to the direct sampling option =0Agot me interested. Time to let the nice p= eople from dealextreme send me another =0Aon for EUR 10 so I can =E2=80=98e= xperiment=E2=80=99 with it.
=0A
Some =0Ainteresting websites/video=E2=80=99s about the direct sampling = =0Aimplementation:
http://ttrftech.t= umblr.com/post/36283680013/rtl2832u-dongle-mods-for-7mhz-reception-with-gqr= x
and
http://mikikg.wordpress.com/2012/08/22/prepravka-dv= b-t-usb-prijemnika-sa-rtl2832u-za-hf-0-28mhz/
=0A
First site is in Japanese, second in Croatian, but= Google =0A(translate) is your friend.
=0A
It is very nice to get an instant overview of 2 MHz of = spectrum. I =0Ahave been plagued by ever increasing QRM here, which forced = me to place a =0Amagnetic loop antenna in my backyard to get any reception = at all. QRM now is =0AS9+10 dB form 100 KHz to nearly 50 MHz. I have not be= en able to find out what =0Acauses this (not generated in my house). See at= tached screenshot for a part of =0Athe spectrum around 80 meters. This  =0Awavy pattern can be seen everywhere from nearly DC to 50 = MHz, with some =0Aclean area=E2=80=99s in between. Sometimes the QRM stops = waving =E2=80=93 straight lines for =0Aseveral seconds and then the waving = restarts.
=0A
I am ver= y jealous of other hams showing waterfall patters where =0Aeverything betwe= en real signals is dark blue... :-(
=0A
Anybody ANY idea what might cause this kind of QRM? =0A
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73=E2=80=99s Minto p= a3bca
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Ceterum =0Acenseo= Carthaginem delendam esse
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&nbs= p;
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From:<= /b> Gar= y - G4WGT
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Sent: Saturday, April 06, 2013 19:55=0A=0A
Subject: Re: LF: =C2=A310 Dongel-SDR Direct sample = on 504 KHz - S/N TEST =0A
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Graham,
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<= font size=3D"2" face=3D"Arial"> 
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Maybe then....if the PCB was installed in a small =0Aalumini= um box the capacitor could be removed & a switch fitted to select the = =0Aoriginal (VHF) arrangement or the HF/LF method. Possibly fit a pre-amp = =0Aalso.
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 <= /div>=0A
73, Gary - G4WGT.
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