Kenwood TS-870 Marine Radio User Manual


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Kenwood TS-870 HF Transceiver
International Radio Filter Installation
The International Radio filters are easily installed in the TS-870 transceiver. The #94 is
used for 8.830MHz and #96 for 455kHz IF stages. The most difficult aspect is removing
the stock filters. The ground terminal of these filters require the most attention and care
must be taken to not remove the eyelet connecting the top and bottom foil traces.
Best wishes,
Dick – AL7B
Coax Preparation
Four lengths of RG-174 type coax are used for connection of the new filters to the radio
circuit boards.
• Two coax assemblies for each filter
• Each assembly about 4.5” in length
o Remove about ¾” of the outside jacket.
o Cut the shield braid back about ½” to expose ¼” of braid.
o Small gauge wire is connected to the braid. No. 30 wire wrap wire works
well.
Strip about ¾” of the insulation from the wire.
Wrap the wire several times around the braid.
Solder the wire to the shield.
o Remove ¼” insulation from the center conductor and tin.
o Install heat shrink tubing over the coax shield.
o Cut the braid wire to length, about ¾” and remove ¼” insulation.
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