How can the bandwidth of 122-16 reach 550MHz?

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gahangwong
Posts: 1
Joined: Thu Nov 25, 2021 8:59 am

How can the bandwidth of 122-16 reach 550MHz?

Post by gahangwong » Thu Nov 25, 2021 10:23 am

It's max sample rate is 122.88Mhz, and the max bandwidth is 550Mhz, how could that happen? Is this a result of band-pass sample?
For example, if I want to sample the whole FM broadcasting band (87Mhz-108Mhz in China), what configuration should I do on hardware and software?

pavel
Posts: 662
Joined: Sat May 23, 2015 5:22 pm

Re: How can the bandwidth of 122-16 reach 550MHz?

Post by pavel » Thu Nov 25, 2021 11:38 am

gahangwong wrote:
Thu Nov 25, 2021 10:23 am
It's max sample rate is 122.88Mhz, and the max bandwidth is 550Mhz, how could that happen?
I think 550 MHz is an analog bandwidth directly copied from the LTC2185 ADC datasheet.
gahangwong wrote:
Thu Nov 25, 2021 10:23 am
For example, if I want to sample the whole FM broadcasting band (87Mhz-108Mhz in China), what configuration should I do on hardware and software?
Sampling a 21 MHz frequency band with the 122-16 board is a little bit challenging.

I have a wideband SDR receiver that can sample two ~9 MHz frequency bands from both RF inputs:

https://github.com/pavel-demin/red-pita ... ide_122_88

It could be used to sample two ~45% parts of a 21 MHz frequency band.

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