1 Aug
2013
1 Aug
'13
10:07 p.m.
Hi,
On 01.08.2013 21:25, Lucas Ingles wrote:
Which is the actual receiver architecture used in the
RTL-SDR dongles? I
mean, do we have a Hartley receiver, a Weaver receiver, a zero-IF
receiver, a low-IF receiver?
Depends on the tuner, the RTL2832 can be used both in zero-IF and in
low-IF mode. For the R820T it's low-IF, for all the other tuners
(including E4K) zero-IF.
Also, the E4K tuner has two outputs: one output is the
in-phase
component and the other output is the quadrature component. So, does the
RTL2832U has two ADCs to sample the two components? Or just one ADC and
it samples the two components interleaved?
It has two ADCs, one for the in-phase and the one for the quadrature
component.
In the low-IF mode only one of them is used, which one can be selected.
The generation of the I/Q signals then is done by an internal DDC.
Regards,
Steve