K9AY and Bi-dir beverage controller

K9AY and 4-way Bi-dir beverage Controller(Edit)

  • This controller allows you to control:
    • Simply K9AY - link (could be only over coax)
    • K9AY++ RF box - link (coax + ctrl cable)
    • Bi-DIR beverage TWO directions - link (only over coax)
    • Bi-DIR beverage FOUR directions with 4-way switch - link (only over coax)
    • You can use some features for more RX antennas

Controller (Edit)

  • 1 - Direction switch
  • 2 - Direction LED indication (0 or 45 deg see below)
  • 3 - Variable Rload in K9AY loop - Only for K9AY with variable Rload circuit
  • 4 - Band Pass Filters - Only if internal BPF-Preamp PCB (see below) is insalled or for K9AY++
  • 5 - Preamplifier On/OFF with LED indication
  • 6 - Red LED means PTT ON.
  • 7 - RXing from TX antenna
  • 8 - RXing from RX antenna port
  • 9 - Fast manual switch for RX antenna (see below)

RX ANT WAY switch(Edit)

  • There are two ways how to connect your RX antenna controller to your TRX (RX).
    • 1. Using RX antenna port on your TRX. Example
    • 2. Using TX ANT port on your TRX and switch antennas in the controller. Example

Add 1:


Add 2:

TX signal way during TXing:

  • You can use internal RX antenna switch.
    • this is ideal for TRX without RX only antenna port
    • also for the rest TRX for fast RX antenna switching
    • switching between TX antenna and RX antenna
  • If you want to use this feature you MUST use PTT IN to control relay for TX antenna!
  • There is easy PTT loop on rear panel with two RCA connectors.
    • PTTcontrol works only in sniffer mode.
  • PTT can continue to your PA over this box.
    • also when the controler is OFF
    • compatible with 5V PTT logic (as OM-power PAs)

NOTE: PTT must be used!!!

  • RX SOURCE knob for fast switching of the RX way

NOTE: RED LED TX must light ON when you TX PTT!!!


  • There are two ACC connectors
    • RJ45 and SUB-D
    • First 8 wires are the same.

NOTE: RJ45 is NOT LAN connection!!!

Jumpers settings(Edit)

Direction LED diode indication(Edit)

K9AY or 4-way Bi-DIR switching matrix(Edit)

  • Select between switching matrix.
  • K9AY and 4-way Bi-dir system do have different switching matrix table.
  • bigger picture

K9AY over coax(Edit)

  • SHORT jumpers for K9AY direction switching over the coax
  • bigger picture

4-way Bi-DIR beverage settings(Edit)

ANT Rload fine tune(Edit)

  • This is function is only for K9AY feeder with Variable Rload part.
  • There are two ways for fine tunning of Rload.
  • Please check some more info about Feeder box of K9AY++ on this link

NOTE: Final Rload resistance may vary with the direction switching. This is caused by thin GND wire between controller and RF feeder box. If the changing is lower than 10 % than all is OK, if more, than more GND wires are recommended. Using CAT-5 FTP (shielded) cable can be big advantage in this problem.

NOTE: For final tunning and measuring, please connect control cable as well also the coax one!

OPTION Internal BPF and preamp PCB(Edit)

  • This is OPTIONAL PCB or it is included in CONTROLLER+ version

Preamplifier GAIN(Edit)

  • With the variable ATT you can set gain of the Preamp as you need.
  • Range is 0 to 17 dB
  • bigger picture

Preamplifier BIAS(Edit)

  • With this trimmer you can set right bias for the transistor.
  • Bias vs IP3 and gain parameters are there: OK2ZAW's blog spot
  • recomended bias is 60 to 85 mA for 13 V+
  • bigger picture

BPF bypass(Edit)

  • You can use one of three BPF (160, 80 or 40m) or you can ByPass it for wideband operation
  • Controller by switch on the front panel - number 4 on controller
  • bigger picture

BPF 160M(Edit)

BPF 80M(Edit)

  • 80M BPF selected by controller.
  • NOTCH filters are included, nulls 160 and 40m.
  • Switch on the front panel - number 2 on controller
  • bigger picture

BPF 40M(Edit)

  • 40M BPF selected by controller.
  • NOTCH filter is included, nulls 80m.
  • Switch on the front panel - number 3 on controller
  • bigger picture