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International Radio :: Products by radio :: Yaesu :: FT-847

Collins mechanical filters or crystal filters for the 455 kHz SSB or CW optional filter slot are no longer available for the FT-847 from INRAD. We have exhausted our supply of adapter circuit boards with matching network for this transceiver model. Collins CW filters are also no longer available, discontinued as of 2017. Crystal filters available for 5 different narrow bandwidths are wired-in with RG174U coax to our "C" board, as the case size of the radio will not accommodate the filter being installed directly onto the board. To install a crystal filter, we pre-wire the filter and board for you. The "C" board is plugged into the optional slot, and then the crystal filter and coaxial cables are placed elsewhere inside the case (directions with pictures provided). No soldering necessary. The FT-847 can use either Collins filters or crystal filters in the CW slot, but crystal filters have much better shape factors than mechanical filters and will improve the selectivity of the radio. Since the crystal filters are much larger and will not fit in the sockets, they must be wired in as described above.

Your crystal filter choices for the radio are:

Bandwidth (Hz)1000500400250125
ModeCWCWCWCWCW
Crystal Filters #713 #721 #703 #704 #719

FT-847

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#712
300 Hz 455 kHz CW 7-pole...
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VOX Box
It's a great little radio, but...
VOX Box
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#705
500 Hz 455 kHz CW 7-pole...
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#706
2500 Hz 455 kHz SSB 8-pole...
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#720
2000 Hz 455 kHz SSB 8-pole...
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#702
2100 Hz 455 kHz SSB 8-pole...
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#704
250 Hz 455 kHz CW 8-pole...
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#713
1000 Hz 455 kHz CW 8-pole...
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#714
1800 Hz 455 kHz SSB 8-pole...
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#715
2800 Hz SSB 455 kHz 8-pole...
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#719
**DISCONTINUED** **NO LONGER...
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#721
500 Hz 455 kHz CW 8-pole...
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#732
4000 Hz 455 kHz SSB 8-pole...
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#703
400 Hz 455 kHz CW 8-pole...
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