Hello Christian,
On Tue, 06 Mar 2012 17:49:02 +0100, "Christian Daniel -- maintech GmbH" <cd(a)maintech.de> wrote:
>
> The RX is not a sensitivity-wonder. Perhaps a preamp?
I have to correct my previous posting, the Funcube has an LNA between
antenna and the E4000 so the sensitivity numbers are not comparable.
But maybe it is possible to use a similar circuit.
Best regards,
Dieter
--
Dieter Spaar, Germany spaar(a)mirider.augusta.de
Hello Christian,
On Tue, 06 Mar 2012 18:59:35 +0100, "Christian Daniel -- maintech GmbH" <cd(a)maintech.de> wrote:
>
> your package is still laying here... sorry... :((((((( (head -> desk)
No problem, thats why I have looked for this USD 20 device ;-)
Best regards,
Dieter
--
Dieter Spaar, Germany spaar(a)mirider.augusta.de
Hello Christian,
On Tue, 06 Mar 2012 17:49:02 +0100, "Christian Daniel -- maintech GmbH" <cd(a)maintech.de> wrote:
>
> The RX is not a sensitivity-wonder. Perhaps a preamp?
According to the Funcube Technical FAQ:
Each unit is tested for 0.15uV for 12dB SINAD NBFM at 145MHz and 435MHz
I am not 100% sure how to compare this number with your results but
this seems to be (much) better (if my quick calculation wasn't totally
wrong).
Also from my very short and quick experience with a DVB-T Stick based
on an E4000 and RTL2832U, the sensitivity is quite good (I only tried
DAB/FM/DVB-T so far with a very bad antenna inside a building).
BTW, according to a newsgroup post this device also offers some sort
of raw mode with around 2 MHz sample rate for 8-bit I/Q values. Not
that bad for USD 20 including shipping ;-)
Best regards,
Dieter
--
Dieter Spaar, Germany spaar(a)mirider.augusta.de
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Hi guys,
I measured the sensitivity of our OsmoSDR. For that I did the
following commands:
tuner.init!
tuner.freq=465000000
tuner.dc_calib!
tuner.dc_table!
tuner.gain=6,9,9,2,15,15
tuner.iqofs=43,27,0,0
I did the measurements on no-so-even frequencies to avoid any lines in
the sprectrum. I increased the power from my signal generator until a
SNR of 10dB as achieved. The RX was tuned 100kHz lower than the TX
signal and the I/Q offset was calibrated before every measurement.
65.2MHz: -99dBm
145.2MHz: -102dBm
435.2MHz: -104dBm
945.2MHz: -85dBm
1300.2MHz: -89dBm
1500.2MHz: -89dBm
1800.2MHz: -84dBm
Also please note that we have a hole at 1200 MHz - there are no valid
PLL settings here.
The RX is not a sensitivity-wonder. Perhaps a preamp?
Best regards,
Christian
- --
- ---------------------------------------------------
| maintech # Dipl. Inf (FH) Christian Daniel |
| GmbH ### Otto-Hahn-Str. 15 · D-97204 Höchberg |
- ---------------------------------------------------
| AG Würzburg, HRB 8790 Tax-ID DE242279645 |
- ---------------------------------------------------
| http://www.maintech.de cd(a)maintech.de |
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Hello everybody,
following up on Harald's great progress I wrote some tool to verify the
RF purity of our design. This is the last step before we can order the
final PCBs and start production.
Sadly from my current results we have some room for improvements. Right
now I'm reviewing the E4000 driver as I suspect the visible steps in the
attached spectrum to be switching points in the E4000. Perhaps something
can be improved here...
Stefan told me that without any antenna the output levels of the E4000
should be below the LSB limit of the ADC - clearly we have a lot of
noise on the signal. But we also don't have any I/Q calibration and I
can see significant offsets on these lines...
I'll keep you posted!
Cheerio,
Christian
- --
- ---------------------------------------------------
| maintech # Dipl. Inf (FH) Christian Daniel |
| GmbH ### Otto-Hahn-Str. 15 · D-97204 Höchberg |
- ---------------------------------------------------
| AG Würzburg, HRB 8790 Tax-ID DE242279645 |
- ---------------------------------------------------
| http://www.maintech.de cd(a)maintech.de |
- ---------------------------------------------------
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