Greetings,
I noticed today that rtl_source_c::get_freq_range() returns an empty range for all but E4000 tuners. Is it due to lack of information? I have dongles with R820T and FCI2580 tuners that I can measure the usable ranges for if needed.
Alex
Hi Alex,
I noticed today that rtl_source_c::get_freq_range() returns an empty range for all but E4000 tuners. Is it due to lack of information? I
Yes, unfortunately.
have dongles with R820T and FCI2580 tuners that I can measure the usable ranges for if needed.
If you can provide the numbers i will add them to the implementation. It seems that at least for the E4000 tuner these numbers will vary by some 10MHz dependent on temperature.
Best regards,
Dimitri
Hi,
On 01.01.2013 21:45, Dimitri Stolnikov wrote:
If you can provide the numbers i will add them to the implementation. It seems that at least for the E4000 tuner these numbers will vary by some 10MHz dependent on temperature.
For the E4K: Not only by temperature, also for each batch of chips, so for the corner frequencies of the range you should just try to tune and look at the return value if it suceeded.
As for the other tuners: We have list in the wiki, which we could implement: http://sdr.osmocom.org/trac/wiki/rtl-sdr#Specifications
Regards, Steve
On Tue, Jan 1, 2013 at 11:03 PM, Steve Markgraf steve@steve-m.de wrote:
Hi,
On 01.01.2013 21:45, Dimitri Stolnikov wrote:
If you can provide the numbers i will add them to the implementation. It seems that at least for the E4000 tuner these numbers will vary by some 10MHz dependent on temperature.
For the E4K: Not only by temperature, also for each batch of chips, so for the corner frequencies of the range you should just try to tune and look at the return value if it suceeded.
As for the other tuners: We have list in the wiki, which we could implement: http://sdr.osmocom.org/trac/wiki/rtl-sdr#Specifications
Dimitri made the changes yesterday according to the wiki and they work great. Thanks for the quick response. I came to think of what to do about direct sampling mode - one could consider adding a "no tuner" option and return 0-28MHz range in that case.
Thanks again!
Alex
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Alexandru Csete -
Dimitri Stolnikov -
Steve Markgraf