Hi Graham
As you may remember I use an up converter for HF. I would like to try the
direct conversion method can you advise where I make the connection. Have you
done a close up jpg of the chip??
Mal as a matter of interest were you keying up a coup[le of time this morning
on about 472.5 at around 10:20 UK time.? I was listening to G3DXZ who did 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 drill" just an
open question?.
73 es GL Pete M0FMT IO91UX
--- On Sun, 29/6/14, Graham <[email protected]> wrote:
> From: Graham <[email protected]>
> 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?
> To: [email protected]
> Date: Sunday, 29 June, 2014, 12:23
>
>
>
>
>
> 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
>
>
> But for round £10/15 supplied
> as-seen not
> 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
> UV HF RTL-SDR USB Tuner Receiver: How to get HF to
> work?
>
>
>
> ----- Original Message -----
> From: DK1IS [email protected]
> [rsgb_lf_group]
> To: [email protected]
>
>
> 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?
>
>
>
>
>
>
>
> Hello Graham,
>
> Please see
> below!
>
> 73,
> Tom,DK1IS
>
> Am 27.06.2014 22:52, schrieb [email protected]
> [rsgb_lf_group]:
>
>
>
> 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´m 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 <[email protected]>
>
>
>
>
>
>
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