Benelec 173809 (Comet CF30MR) Low Pass Filter HF 1K PEP High Grade for TVI, BCI.
 

Features Attractive attenuation characters at high frequency. High power transmission is acceptable for 500W CM. Finest 9 filters realized extremely low insertion loss. Superior band-pass characteristics to prevent interference.
How to Use (Examples) Fig. 2 shows, the filter is used between transceiver out-put circuit and antenna. Fig. 3 showing the use of filter at outside at transmitter. Note: a - b length should be within 1 meter. Can also be used at the inside of transmitter, as shown in Fig. 4. Combination with Antenna Coupler, as shown in Fig. 5. Fig. 6 showing combination with Linear Amplifier.
Notes Matching between transceiver and antenna is to be well balanced, within VSWR of less 2.0, using your SWR meter. Transceiver is to be grounded completely. TVI, BCI will happen at various occasions. If the filter cannot prevent TVI, BCI sufficiently, another proper method for prevention is to be studied at the same time. The filter is developed only for indoor use, and not for the out-door use.