8 volts to close to 12V after a short period of time
product safety
or when you dont want to hear CW you can connect the MFJ-461 to your receiver witha cable
RFI and prevent RF hot spots
MFJ-784B, TUNABLE DSP AUDIO FILTER Telescopic 8 volts to close toMFJs tunable super DSP filter automatically eliminates heterodyne, reduces noise and interference simultaneously on SSB, AM, CW, packet, AMTOR, PACTOR, RTTY, SSTV, WeFAX, FAX, weak signal VHF, EME, satellite nearly any mode. You get MFJs tunable FIR linear phase filters that minimize ringing, prevent data errors and have "brick wall" filter response with up to 57 dB attenuation 75 Hz away. Only MFJ gives you 5 tunable DSP filters. You can tune each