Kenwood TS-870 manual Coax Preparation

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

oRemove about ¾” of the outside jacket.

oCut the shield braid back about ½” to expose ¼” of braid.

oSmall gauge wire is connected to the braid. No. 30 wire wrap wire works well.

ƒStrip about ¾” of the insulation from the wire.

ƒWrap the wire several times around the braid.

ƒSolder the wire to the shield.

oRemove 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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