Procedure for Interfacing the Quadra to the FT-847

by Adam Farson VA7OJ/AB4OJ

As the FT-847 does not have a Band Data 1 (4-bit band data code) interface, the Quadra will work with it on the same basis as with a non-Yaesu exciter, as described here.

Fig.1: Band Data 2 Cable.
Fig.1: Band Data 2 Cable.

The Band Data 2 cable is made up as illustrated in Fig.1:

Fig.2: FT-847 STBY Socket.
Fig.1: FT-847 STBY Socket.
  1. Insert the RCA plug on the Band Data 2 cable into the FT-847 PTT jack (RCA).

  2. Connect STBY (amplifier keying) cable as follows:

  3. VL-1000 PTT1 (RCA) plug shell to FT-847 STBY Pin 1 (Ground). Refer to Fig.2.

  4. VL-1000 PTT1 (RCA) plug centre pin to FT-847 STBY Pin 3 (HF).

  5. VL-1000 PTT2 (RCA) plug shell to FT-847 STBY Pin 1 (Ground).

  6. VL-1000 PTT2 (RCA) plug centre pin to FT-847 STBY Pin 5 (50 MHz).

  7. Insert RCA plug into VL-1000 PTT1 jack (RCA), and 5-pin mini-DIN plug into FT-847 STBY jack.

  8. Connect VL-1000 ALC1 (RCA) to FT-847 ALC (RCA).

  9. Note: For 50 MHz operation, connect VL-1000 ALC2 (RCA) to FT-847 ALC (RCA).

  10. Connect VL-1000 INPUT 1 to FT-847 HF coax socket via coax jumper.

  11. Connect VL-1000 INPUT 2 to FT-847 50 MHz coax socket via coax jumper.

  12. Connect VP-1000, VL-1000 and FT-847 ground lugs to station ground point with braid or suitable wire.

  13. Select FM or RTTY for band selection (F SET) and auto-tuning (TUNE). The VL-1000 requires at least 50W drive for proper tuning and band selection.

The VL-1000 keys the FT-847 via the exciter's PTT jack to obtain a tuning carrier; the VL-1000 counts the excitation frequency and sets itself to the correct frequency range. Once the ALC is set as per the VL-1000 user manual, the VL-1000 will deliver 1kW output (HF) with approx. 75W drive. (De-rate to 500W on 50 MHz.) Please refer to main Quadra page. See also FT-847 user manual, pages 5 and 29.

View Joe Subich W4TV's FL-7000/FT-920 interface.

Copyright  2005-2022 A. Farson VA7OJ/AB4OJ. All rights reserved. Last updated 10/09/22