About GSM 1800 Mhz and 2100Mhz

[galaxy13061980]

Hello everyone.

I have analyzed GSM 900Mhz successfully (with RTL 2832U and grgsm) . But with GSM 1800 and 2100Mhz, i can not do the same thing. I intend to analyze GSM with HackRF.

Do you have documentation this isusue or have done yet? give me information or guide step by step, please.

Regards...

[Piotr Krysik]

W dniu 29.05.2018 o 05:27, galaxy13061980 pisze:

Hi,

Most RTL-SDR receivers don't work above 1.7GHz, so this is not evidence
of gr-gsm issue most probably. However I'm interested in your results in
1.8GHz band with HackRF (as I don't have any HackRF currently).

--
Best Regards,
Piotr Krysik

[h shannon]

I have been using gr-gsm with a HackRF on 1900MHz without any problem.

--Heather Shannon

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[Cinaed Simson]

On 05/31/2018 05:01 AM, h shannon wrote:
> I have been using gr-gsm with a HackRF on 1900MHz without any problem.
>
> --Heather Shannon

I tried grgsm_livemon yesterday with my hackrf but with a 915 MHz
antenna - the only antenna I had with me - and it appeared to work.

It may bite me in the ass when I tune it to 1900 MHz next weekend.

I used the default settings of the gnuradio rtl_sdr source - but I
changed the gain settings.

I set the RF gain to 0, the IF gain to 32, and moved the gain_slider to
the base band gain.

I'll have to confirm it's working after I learn something about GSM and
how to use gr-gsm.

Last year I tried playing with the hackrf and gr-gsm but I couldn't get
anything to work - I couldn't even get the rtl dongle work.

The rtl dongle gave me pll errors with very few signals using kal.

I didn't see anything in grgsm_livemon with rtl dongle - and even
rtl_test gave me pll errors.

I finally figured out it was the bias-tee versions the rtl_sdr and
gr-osmosdr which were the source of my problems - at least for the rtl
dongle.

I removed the bias tee option and rebuilt the software rtl_sdr,
gr-osmosdr, and gnuradio - and everything appears to be working.

-- Cinaed