Yaesu's classic, top of the line HF transceiver for contesters and DXers is
probably the only ham dual-receiver radio that does true diversity reception
|Important Addendum to KD5VC 250Hz Filter Mod|
In KD5VC's mod, the references to connecting a new diode between
the cathodes of the 250Hz and 500Hz select diodes means
to connect to the
PCB solder pads that the cut diodes' cathodes were formerly
connected to, not to the cut flying leads on the actual diodes
The 250Hz select diode is D2045 and the 500Hz select diode is D2046.
Both are clearly marked on the PCB.|
This mod also appeared in QST, Jun 96, p.70 (with the same ambiguous narrative). I have installed it and it works very well. An FT-1000D does not ship with the 250Hz 3rd IF filter- it is an option. This circuit trick can save you the cost of a crystal filter- with a 5 cent diode- while still greatly improving CW performance at 250Hz BW over the factory stock configuration. For FT-1000 owners: note that the mod assumes that the 250Hz 2nd IF filter is already installed. The purpose here is to cascade the 500Hz 3rd If filter with the 250Hz 2nd IF filter. Thanks to KD5VC for an excellent mod!
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