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Date: Sun, 29 Jun 2014 12:50:28 +0100
From: M0FMT <m0fmt@yahoo.co.uk>
To: rsgb_lf_group@blacksheep.org
MIME-Version: 1.0
Subject: Fw: 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?
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Hi Graham

As you may remember I use an up converter for HF. I would like to try the d=
irect conversion method can you advise where I make the connection. Have yo=
u done a close up jpg of the chip??

Mal as a matter of interest were you keying up a coup[le of time this morni=
ng on about 472.5 at  around 10:20 UK time.? I was listening to G3DXZ who d=
id a break ditdit dahdah ditdit's when we heard a couple of short dashes...=
... which is unusual considering the activity on the band....... no "pack d=
rill" just an open question?.

73 es GL Pete M0FMT IO91UX


--- On Sun, 29/6/14, Graham <g8fzk@g8fzk.fsnet.co.uk> wrote:

> From: Graham <g8fzk@g8fzk.fsnet.co.uk>
> Subject: Re: LF: Fw: : Re: [rsgb_lf_group] Re:: 100KHz-1.7GHz full band U=
V HF RTL-SDR USB Tuner Receiver: How to get HF to work?
> To: rsgb_lf_group@blacksheep.org
> Date: Sunday, 29 June, 2014, 12:23
>=20
>=20
> =20
> =20
>=20
> Thanks Mal,
> =C2=A0
> Tom , wired them direct=C2=A0 last=C2=A0 night=C2=A0
> .... interesting=C2=A0=20
> angle , seems they=C2=A0 have=C2=A0 dropped=C2=A0 half=C2=A0
> of=C2=A0 a=C2=A0=20
> normal=C2=A0 dongle=C2=A0 into=C2=A0 a=C2=A0 docking=C2=A0
> board , The=C2=A0=20
> issue I was=C2=A0 interested=C2=A0 in was the=C2=A0 Ae=C2=A0
> feed=C2=A0=20
> for=C2=A0 low=C2=A0 bands=C2=A0 , and from the=C2=A0 image ,
> its=C2=A0 visible ,=20
> that the feed is=C2=A0 single=C2=A0 ended , via the=C2=A0
> toroid ., he=C2=A0=20
> also=C2=A0 plotted the=C2=A0 gain , which=C2=A0 falls=C2=A0
> off=C2=A0 to=C2=A0=20
> LF , which=C2=A0 is=C2=A0 similar to the=C2=A0 device=C2=A0
> being=C2=A0=C2=A0=20
> Cap =C2=A0 coupled=C2=A0 , both are=C2=A0 single=C2=A0 ended
> methods ...=C2=A0=20
> 100KHz=C2=A0 is=C2=A0 listed=C2=A0 as the=C2=A0 lower=C2=A0
> operating=C2=A0=20
> frequency=C2=A0 , in this=C2=A0 case its=C2=A0 possible
> the=C2=A0 transformer=20
> is=C2=A0 the=C2=A0 reason=C2=A0 ......
> =C2=A0
> I think a=C2=A0 small=C2=A0=C2=A0 pre-amp=C2=A0[ 10 dB
> ?]=C2=A0with=C2=A0=20
> gain=C2=A0 roll=C2=A0 off=C2=A0 to=C2=A0 HF would=C2=A0 be a
> better=C2=A0=20
> option=C2=A0 , as the=C2=A0 chip=C2=A0 works=C2=A0 in=C2=A0
> a direct=20
> coupled=C2=A0 set up=C2=A0 , down to=C2=A0 audio , a pre
> amp=C2=A0 could=C2=A0=20
> also=C2=A0 provide the=C2=A0 ~~ 200
> ohms=C2=A0=C2=A0input=C2=A0 match as well=20
> =C2=A0
> =C2=A0
> But for=C2=A0 round=C2=A0 =C2=A310/15 =C2=A0supplied=C2=A0
> as-seen=C2=A0 not=20
> a=C2=A0 bad=C2=A0 option=20
> =C2=A0
> 73-G,=20
>=20
>=20
>=20
>=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=20
> UV HF RTL-SDR USB Tuner Receiver: How to get HF to
> work?
>=20
>=20
> =C2=A0
> ----- Original Message -----=20
> From: DK1IS DK1IS@kabelmail.de=20
> [rsgb_lf_group]=20
> To: rsgb_lf_group@yahoogroups.co.uk
>=20
>=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?
>=20
> =C2=A0
>=20
>=20
>=20
>=20
>=20
> Hello Graham,=20
>=20
> Please see=20
> below!
>=20
> 73,
> Tom,DK1IS
>=20
> Am 27.06.2014 22:52, schrieb g0nbd@hotmail.com
> [rsgb_lf_group]:
>=20
> =C2=A0=20
>  =20
>   Tom,
>  =20
>=20
>   At least =C2=A0its =C2=A0running =C2=A0!
> Yes it=20
> is and not so bad!
>=20
>=20
>  =20
>  =20
>  =20
>  =20
>  =20
>=20
>   ''=C2=A0only 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=20
> stations at HF, only noise) and "Q Input"
> (stations at HF).
>=20
>=20
>  =20
>  =20
>  =20
>  =20
>  =20
>  =20
>=20
>   Do I
> assume,=20
>   that =C2=A0they are =C2=A0using =C2=A0a =C2=A0single
> =C2=A0ended =C2=A0feed=20
>   =C2=A0for =C2=A0the =C2=A0low =C2=A0band=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.
>=20
>=20
>  =20
>  =20
>  =20
>  =20
>  =20
>=20
>   Is there=20
>   =C2=A0some =C2=A0form =C2=A0of =C2=A0pre-amp =C2=A0/ pass
> =C2=A0band=20
>   =C2=A0filter =C2=A0before the =C2=A0input=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)
>=20
>=20
>  =20
>  =20
>  =20
>  =20
>  =20
>=20
>   73-G,
>   =C2=A0
>=20
>=20
> __._,_.___
>=20
>=20
>=20
> Posted by: DK1IS <DK1IS@kabelmail.de>=20
>=20
>=20
>=20
>=20
>  =20
>  =20
>     Reply
>=20
>       via web post=20
>     =E2=80=A2
>     Reply
>=20
>       to sender=20
>     =E2=80=A2
>     Reply
>=20
>       to group=20
>     =E2=80=A2
>     Start
>=20
>       a new topic=20
>     =E2=80=A2
>     Messages
>=20
>       in this topic (5)=20
> Visit
>=20
> Your Group=20
>=20
>   New
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>   Members 2=20
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> =E2=80=A2=20
> Unsubscribe
>=20
> =E2=80=A2 Terms
> of=20
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> .=20
> =20
> __,_._,___
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