Hi Mike and Jack,

The tap points in an 818ND, or indeed to the late models of 817ND, are pretty much in the same place as they used to be: +RxB still on that one via, the signal on either the output (as per official HupRF installation instructions) or the input (as commonly done by various people on the Internet in order to gain more panadapter bandwidth).

Unfortunately the latter is MUCH more troublesome to solder a wire to than it used to be because since Lot 262, XF1001 is a surface-mount four-pole filter DSF753SBF rather than the through-hole MF68 from the earlier models. This means very, very little space to solder the wire to on the one hand and a considerable risk of creating a short between the input-or-output pad and the body of the filter. Personally, after much deliberation I decided that adding a panadapter to my 817 was not worth the risk of bricking it.

If you feel brave, have got a steady hand and have sourced some very fine wire, position your transceiver so that the PLL-unit shield is closer to you and the writing on XF1001 is the right way up. In that orientation, the input pad is bottom left and the output one is top right. The other two corner pads are connected to ground and can be identified quite easily because they both have short tracks leading from them to vias.

Good luck! You will need it.

Source: Yaesu FT-817/ND/-818ND Technical Supplement, available from various places on the Web.

-- Marek M0JUR