I am selling a high-quality 915MHz bandpass filter that is a perfect match for the LimeSDR-USB (specifically optimized for the RX_L port).This is an excellent tool for anyone working in the 902-928MHz ISM/LoRa/RFID band who needs to clear out interference from nearby cellular or FM towers.
Technical Specifications:
. Passband: 902-928MHz
. Max Input Power: +10dbm
. Impedance: 50 ohms
. Connector: u.fl rf connectors on PCB for Input and Output
. Condition: New (use as an inline rf bandpass filter for bench testing on RX)
Notes: I have found this filter significantly lowers the noise floor when using the LimeSDR in a noisy rf environment for LoRa, ISM and RFID sniffing.Please PM or email me if you are interested or have questions!
For anyone interested,I can ship this filter globally
Some measured data along with a few photos are shown below:
The photos show the rf filter pcb and then the rf filter pcb compared to the size of a Micro SD memory card. The actual pcb size,including the rf u.fl connectors is 10mm by 12mm by 2.4mm high.Please note that since these photos where taken (mid April), the filter board has been updated with pcb tracking changes and dc blocks on the inputs and outputs.The measured data shown below is for the very latest board-I will update the photos of the pcb in a few days time but the size has not changed.
The two graphical plots show the S21(db) response narrow band (915MHz+/_100MHz) and wideband from (100MHz-6.1GHz).
I also have available a full two port s-parameter data (S2P) measured over the frequency band (100MHz-6.1GHz) which can be used in your favourite RF Design Software Simulator such that you can determine the expected filter rejection for any unwanted blocking frequencies across the band (100-6100)MHz before you actually try the filter in situ practically.
902MHz IL=-2.40dbc
915MHz IL=-1.70dbc
928MHz IL=-1.27dbc
