Delivered-To: daveyxm@virginmedia.com Received: by 10.50.142.105 with SMTP id rv9csp244540igb; Sun, 29 Jun 2014 07:27:05 -0700 (PDT) X-Received: by 10.180.206.109 with SMTP id ln13mr4615812wic.17.1404052022376; Sun, 29 Jun 2014 07:27:02 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com. [195.171.43.25]) by mx.google.com with ESMTP id o2si20670600wje.108.2014.06.29.07.27.01 for ; Sun, 29 Jun 2014 07:27:02 -0700 (PDT) Received-SPF: none (google.com: owner-rsgb_lf_group@blacksheep.org does not designate permitted sender hosts) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: owner-rsgb_lf_group@blacksheep.org does not designate permitted sender hosts) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1X1DDH-0001Yt-Es for rs_out_1@blacksheep.org; Sun, 29 Jun 2014 12:24:03 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1X1DDH-0001Yi-1X for rsgb_lf_group@blacksheep.org; Sun, 29 Jun 2014 12:24:03 +0100 Received: from smtpout5.wanadoo.co.uk ([80.12.242.80] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.82) (envelope-from ) id 1X1DDE-0005en-Ul for rsgb_lf_group@blacksheep.org; Sun, 29 Jun 2014 12:24:01 +0100 Received: from AGB ([2.31.69.97]) by mwinf5d67 with ME id LBPw1o00625vB4a03BPweb; Sun, 29 Jun 2014 13:23:59 +0200 X-ME-Helo: AGB X-ME-Date: Sun, 29 Jun 2014 13:23:59 +0200 X-ME-IP: 2.31.69.97 Message-ID: From: "Graham" To: References: In-Reply-To: Date: Sun, 29 Jun 2014 12:23:56 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 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: Thanks Mal, Tom , wired them direct last night .... interesting angle , seems they have dropped half of a normal dongle into a docking board , The issue I was interested in was the Ae feed for low bands , and from the image , its visible , that the feed is single ended , via the toroid ., he also plotted the gain , which falls off to LF , which is similar to the device being Cap coupled , both are single ended methods ... 100KHz is listed as the lower operating frequency , in this case its possible the transformer is the reason ...... [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.80 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 67b98dc82eec1a7201a2705e144698dc Subject: Re: LF: Fw: : Re: [rsgb_lf_group] Re:: 100KHz-1.7GHz full band UV HF RTL-SDR USB Tuner Receiver: How to get HF to work? Content-Type: multipart/alternative; boundary="----=_NextPart_000_004A_01CF9394.FF0DC890" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.2 required=5.0 tests=HTML_70_80,HTML_MESSAGE, HTML_TAG_EXISTS_TBODY,HTML_WEB_BUGS,MISSING_OUTLOOK_NAME,PORN_4 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 This is a multi-part message in MIME format. ------=_NextPart_000_004A_01CF9394.FF0DC890 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Thanks Mal, Tom , wired them direct last night .... interesting angle , seems = they have dropped half of a normal dongle into a docking = board , The issue I was interested in was the Ae feed for low = bands , and from the image , its visible , that the feed is single = ended , via the toroid ., he also plotted the gain , which falls = off to LF , which is similar to the device being Cap coupled = , both are single ended methods ... 100KHz is listed as the lower = operating frequency , in this case its possible the transformer is = the reason ...... I think a small pre-amp [ 10 dB ?] with gain roll off to HF = would be a better option , as the chip works in a direct coupled = set up , down to audio , a pre amp could also provide the ~~ 200 = ohms input match as well =20 But for round =C2=A310/15 supplied as-seen not a bad option=20 73-G,=20 From: mal hamilton=20 Sent: Sunday, June 29, 2014 8:31 AM To: rsgb=20 Subject: LF: Fw: : Re: [rsgb_lf_group] Re:: 100KHz-1.7GHz full band UV = HF RTL-SDR USB Tuner Receiver: How to get HF to work? ----- Original Message -----=20 From: DK1IS DK1IS@kabelmail.de [rsgb_lf_group]=20 To: rsgb_lf_group@yahoogroups.co.uk=20 Sent: Saturday, June 28, 2014 12:09 PM Subject: Re: : Re: [rsgb_lf_group] Re:: 100KHz-1.7GHz full band UV HF = RTL-SDR USB Tuner Receiver: How to get HF to work? =20 Hello Graham,=20 Please see below! 73, Tom,DK1IS Am 27.06.2014 22:52, schrieb g0nbd@hotmail.com [rsgb_lf_group]: =20 Tom, At least its running ! Yes it is and not so bad! '' only the q-input works'' This only means that if you click the ExtIO button at the HDSR user = interface "RTL Setting" offers to you at Direct Sampling "Disabled" (for = VHF/UHF), "I input" (no stations at HF, only noise) and "Q Input" = (stations at HF). Do I assume, that they are using a single ended feed for the = low band ? Having no datasheet for the RTL2832U I=C2=B4m not sure about this. As = you can see on the picture enclosed at the lower side of the pcb there = is a small ferrite toroid for the HF signal with two output wires, first = being fixed with silicone on the RTL2832U housing and then going to two = adjacent pins of the IC - whatever this means. Is there some form of pre-amp / pass band filter before the = input ? There is no pre-amp but you can see a two stage low pass filter on th = left side of the ferrite toroid (two coils and 6 capacitors) 73-G, __._,_.___ -------------------------------------------------------------------------= ------- Posted by: DK1IS =20 -------------------------------------------------------------------------= ------- Reply via web post =E2=80=A2 Reply to sender =E2=80=A2 Reply to = group =E2=80=A2 Start a new topic =E2=80=A2 Messages in this topic (5) = =20 Visit Your Group a.. New Members 2=20 =E2=80=A2 Privacy =E2=80=A2 Unsubscribe =E2=80=A2 Terms of Use=20 . =20 __,_._,___ ------=_NextPart_000_004A_01CF9394.FF0DC890 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Thanks Mal,
 
Tom , wired them direct  last  night  .... = interesting =20 angle , seems they  have  dropped  half  of  = a =20 normal  dongle  into  a  docking  board , = The =20 issue I was  interested  in was the  Ae  feed =20 for  low  bands  , and from the  image , its  = visible ,=20 that the feed is  single  ended , via the  toroid ., = he =20 also  plotted the  gain , which  falls  off  = to =20 LF , which  is  similar to the  device  = being  =20 Cap   coupled  , both are  single  ended methods = ... =20 100KHz  is  listed  as the  lower  = operating =20 frequency  , in this  case its  possible the  = transformer=20 is  the  reason  ......
 
I think a  small   pre-amp [ 10 dB = ?] with =20 gain  roll  off  to  HF would  be a = better =20 option  , as the  chip  works  in  a direct=20 coupled  set up  , down to  audio , a pre amp  = could =20 also  provide the  ~~ 200 ohms  input  match as = well=20  
 
But for  round  =C2=A310/15  supplied  = as-seen  not=20 a  bad  option
 
73-G,

From: mal hamilton
Sent: Sunday, June 29, 2014 8:31 AM
To: rsgb
Subject: LF: Fw: : Re: [rsgb_lf_group] Re:: 100KHz-1.7GHz = full band=20 UV HF RTL-SDR USB Tuner Receiver: How to get HF to = work?

 
----- Original Message -----=20
From: DK1IS = DK1IS@kabelmail.de=20 [rsgb_lf_group]
To: rsgb_lf_group@yahoogroups= .co.uk=20
Sent: Saturday, June 28, 2014 12:09 PM
Subject: Re: : Re: [rsgb_lf_group] Re:: 100KHz-1.7GHz full = band UV=20 HF RTL-SDR USB Tuner Receiver: How to get HF to work?

  =

Hello Graham,

Please see=20 below!

73,
Tom,DK1IS

Am 27.06.2014 22:52, schrieb g0nbd@hotmail.com = [rsgb_lf_group]:
 =20

Tom,


At least  its  running =  !
Yes it=20 is and not so bad!

'' only the=20 q-input works''
This = only means=20 that if you click the ExtIO button at the HDSR user interface "RTL = Setting"=20 offers to you at Direct Sampling "Disabled" (for VHF/UHF), "I input" (no = stations at HF, only noise) and "Q Input" (stations at HF).

Do I = assume,=20 that  they are  using  a  single  ended =  feed=20  for  the  low  band=20 ?
Having no datasheet = for the=20 RTL2832U I=C2=B4m not sure about this. As you can see on the picture = enclosed at the=20 lower side of the pcb there is a small ferrite toroid for the HF signal = with two=20 output wires, first being fixed with silicone on the RTL2832U housing = and then=20 going to two adjacent pins of the IC - whatever this means.

Is = there=20  some  form  of  pre-amp  / pass  band=20  filter  before the  input=20 ?
There is no pre-amp = but you=20 can see a two stage low pass filter on th left side of the ferrite = toroid (two=20 coils and 6 capacitors)

73-G,
 

__._,_.___
Posted by: DK1IS <DK1IS@kabelmail.de>=20
Reply=20 via web post Repl= y=20 to sender Reply=20 to group St= art=20 a new topic Messages=20 in this topic (5)
=E2=80=A2 =E2=80=A2 =E2=80=A2 =E2=80=A2
Visit=20 Your Group=20 New=20 Members 2=20
=20
=E2=80=A2 Priv= acy =E2=80=A2=20 Unsubscribe=20 =E2=80=A2 Te= rms of=20 Use

.

=20
__,_._,___
------=_NextPart_000_004A_01CF9394.FF0DC890--