This is a small, cost-effective band pass filter centered at 915 MHz with a typical insertion loss of 2.5 dB in the pass band 902-928 MHz.
This filter has been designed specifically for Helium miners. It has RP-SMA connectors at either end so that you don't need additional RF adapters. This minimizes filter insertion loss.
This filter has excellent rejection specifications. Rejection at 880 MHz for instance, is typically greater than 40 dB. The filter also provides power handling of up to a maximum +24 dBm and has an operating temperature range of -40C to +85C.
Please ensure that your:
- Miner has an RP-SMA-F RF Input connector (shown in the product photos) and
- Antenna has an RP-SMA-M Input connector
APPLICATIONSHelium Miners with RP-SMA RF input connectors
Frequency Typical Insertion Loss
DC-800 MHz 50 dB
800-880 MHz 40 dB
960-1080 MHz 32 dB
1080-1500 MHz 40 dB
1500-3000 MHz 25 dB
The filter uses RP-SMA PCB edge mount connectors.
The filter cannot block or tolerate a DC voltage. It will be damaged if a DC voltage is applied at either the input or output. Some receivers have a Bias Tee that is always On by default. Inserting this filter between such a receiver and the antenna will destroy the filter.
*A Helium filter is beneficial if your Helium antenna is on the top of a building, tower or other location where there are LTE or cellular transmitters. It also benefits certain miners that have omitted an internal SAW filter to save hardware costs. In many situations a filter may not benefit performance. In fact in some situations, it will degrade performance.
After adding a filter between the antenna and miner, we recommend leaving it in there and running your experiment for at least a week. The Helium network is very unstable and the frequency of beacons from neighboring hotspots can vary greatly for many different reasons. A week gives enough time to assess if a filter is beneficial or not.