Difference between revisions of "Filter"
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| − | [[Image:IMG_0151.jpg |thumbnail|right| No filter]] | + | [[Image:IMG_0151.jpg |thumbnail|right| No filter -> 3 GHz]] |
| − | [[Image:IMG_0152.jpg |thumbnail|right| Filtered]] | + | [[Image:IMG_0152.jpg |thumbnail|right| Filtered -> 3 GHz]] |
| − | = | + | [[Image:dab_s_fl2.jpg|thumbnail|right| Under Test]] |
| + | = VHF Band 3 filter = | ||
As you have seen on the other section of this wiki we need to filter uppers harmonics present at the output of the USRP, for example from the [[WBX daughterboard]] | As you have seen on the other section of this wiki we need to filter uppers harmonics present at the output of the USRP, for example from the [[WBX daughterboard]] | ||
| Line 9: | Line 10: | ||
The Filter give a flat response from 178 to 275 Mhz when soldered on the amplifier input strip line, the insertion loss on the same frequency range is equal to 1 dB. | The Filter give a flat response from 178 to 275 Mhz when soldered on the amplifier input strip line, the insertion loss on the same frequency range is equal to 1 dB. | ||
| − | This what we get when sweeping the signal from 6 to | + | This is what we get when sweeping the signal from 6 to 402 MHz (higher was always better than 60 dB of att, measured up to 6.5 GHz): |
[[Image:filter_minic_b3_g.jpg]] | [[Image:filter_minic_b3_g.jpg]] | ||
| − | The response at various frequency indicated by markers from 1 to 10 (attenuation in dB of the filter) | + | The response at various frequency indicated by markers from 1 to 10 (attenuation in dB of the filter from 120 to 350 MHz) |
[[Image:filter_minic_b3_c1.jpg]] | [[Image:filter_minic_b3_c1.jpg]] | ||
Latest revision as of 16:27, 13 October 2010
VHF Band 3 filter
As you have seen on the other section of this wiki we need to filter uppers harmonics present at the output of the USRP, for example from the WBX daughterboard
We have tested the RBP-220W from Minicircuit, a pass band for the band 3.
The Filter give a flat response from 178 to 275 Mhz when soldered on the amplifier input strip line, the insertion loss on the same frequency range is equal to 1 dB.
This is what we get when sweeping the signal from 6 to 402 MHz (higher was always better than 60 dB of att, measured up to 6.5 GHz):
The response at various frequency indicated by markers from 1 to 10 (attenuation in dB of the filter from 120 to 350 MHz)
