Hi Pete
I googled rtl direct conversion , there are a few close up' , part of
web sites , the eastern eu sites seem to be the best ones
There are qty x 2 caps in the input lines 1.5 mm size , these make
handy solder terminals , the images show which one to use for direct
... as to leaving the cap in place , not sure , if the vhf side is
dead , tempting to remove it , but ensure your input is decoupled ..
After running on 7mhz , I found I had frazzled the vhf input of my
dongle , which ran 24 MHz > 1.? Ghz ..however , the A/D is still
working and placing the MK1 digit on one of the caps produces HF radio
signals .. these $10 wonders have 2
lives :)
Where is Jim these days ? , what we need is one of his pre amps
with a tailored response and 200 ohms output Z , 10 dB of gain 3 or 4 s
points should be enough ?
73-G,
--------------------------------------------------
From: "M0FMT" <[email protected]>
Sent: Sunday, June 29, 2014 12:50 PM
To: <[email protected]>
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?
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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