RF low pass, band pass and notch filters
RF low pass, band pass and notch filters
Cross
Country Wireless produce a range of RF low pass, band pass and notch filters with lightning surge arrestors.
Our filter products cover the HF, 50, 70, 144 and 432 MHz amateur radio bands and the TETRA and UHF aircraft frequencies.
We also build a double notch filter for the 144 MHz amateur radio band to filter our the radio paging frequencies at 138 and 153 MHz.
High performance CAD designed band pass filter using cascaded multi pole Chebyshev high pass and low pass filters
Ideal for SOTA, RAYNET, ARES, or RACES for fixed, mobile or portable stations operating on multi-transmitter sites
Passband insertion loss <1 dB
144 MHz, +/- 7 MHz -6 dB, stopband better than -50 dB (typically -55 to -70 dB)
Advanced design also acts as a lightning surge arrestor capable of diverting repetitive induced lightning surges up to 5000 Amps
100 Watts RF max (144 MHz notch filter 50 Watts max)
N type female connectors as standard. Options - BNC female, SO239 female or N type in-line (1 N male / 1 N female) or TNC female
Painted aluminium case sealed to IP65 standard (dust tight and protected against water jets)
RoHS certified free from certain hazardous substances banned by the EU Click here for a sample RoHS certificate.
Each filter is supplied with a test certificate detailing its RF performance Click here for a sample filter test certificate.
Carefully made in the UK
Click here for a frequency plot of a typical 50 MHz band pass filter.
Click here for a frequency plot of a typical 70 MHz band pass filter.
Click here for a frequency plot of a typical 144 MHz band pass filter.
Please note before ordering that all filters are usually built to order. Dispatch can be up to two weeks after order.
When ordering please state the type of RF connectors required (N type female, N type male/female, S0239, BNC female or TNC female).
Prices on application.
Click here for details of the RAYNET filter loan scheme using our filters.
The 144 MHz prototype filter was tested on Winter Hill near Bolton, a well known broadcast site, during a RAYNET exercise for the Bolton Scout Hike in April 2007. Checkpoint 3 was located on a hill top with many other radio transmitters. The FDK transceiver used was unusable without the filter due to receiver overload. With the filter in circuit no interference was heard. (Note the photo doesn't even show the broadcast site!)
If
you require more detailed information or need a special one-off filter or diplexer please contact us by email at
info@
