Monthly Archives: April 2016

LDG Z-11 Pro II Cheat Sheet

The LDG Z-11 Pro II is a great little tuner.  Once you get it set up you’ll never touch some settings again – that is until you fat finger something by mistake and have to unfuck yourself.  As such, it’s handy to have a cheat sheet:

Two notes:

  1. It is worth getting the accessory cable.  If you don’t use an accessory cable between the tuner and radio you have to generate a signal when you want to tune.  It’s not enough to key the mic, you have to be talking the entire time. All those spaces between words and conversational pauses – they don’t count.  Buy the cable.
  2. That battery pack install is more daunting then it appears.  I watched the installation video ( and opened up the magic box.  Those are some damn small holes and I am not a very good solder-meister.  At some point, after some practice, I will attempt the install.  For now I’m running external power.

Initial Setup:


Connect Transceiver HF port to Tuner “TX” port.
Connect Antenna to Tuner “ANT” port.
Connect accessory cable Red to Radio to accessory jack, black to Tuner.
Connect power.
Func -> Thresh until Automatic Tune thresh hold is 1.5/2.0
Func -> Auto until outside lights blink (Semi-Auto mode engaged.)
Tune momentarily until lights flash once (Tuner engaged.)
Press Tune for longer then .5 seconds, less then 2.5 seconds to tune.

General Operation:

Before I transmit on any given band I will find an empty freq somewhere (+/- 2khz) around where I intend to transmit and engage the semi-auto tune (Press “Tune” for somewhere between half a second and two and a half seconds.)  If the freq I initially tune to is near the middle of the band I’ll keep an eye on SWR when transmitting.  If the freq I tune to is on the edge of the band I will re-tune if I move.


No Power:

Verify power connector at the unit is seated.
Verify power poles between the connector and batter are seated.
Verify terminals at the battery are seated.

Failed Tune:

Toggle Bypass Mode (Press Tune Momentarily.  Tuner is engaged when LED’s blink once.)
Verify accessory cable is seated correctly (Red connector to Radio Accessory jack.)
Toggle Semi-Auto tune (Func -> C DN Outside LED’s blink)
Reseat jumper from Transceiver to Tuner (TX)
Reseat antenna at Tuner (Ant)

Everything below is present in the manual, it’s just cut up and formatted a little different.

Link to the manual:

Page 5:

On the front panel there are six pushbuttons and four LED indicator lights.

  • Func: Pressing momentarily selects secondary functions for other buttons.
  • C Up / C Dn: Manually increase/decrease capacitance.
  • L Up / L Dn: Manually increase/decrease inductance.
  • Tune: Initiates a tuning cycle, or places the tuner in bypass mode.
  • 1.5, 2.0, and >3.0 LEDs: Indicate SWR. Tune LED: Indicates tuning is in progress.

Page 19:


Function  – Button Sequence

Toggle Auto / Semi mode – FUNC then C Dn
Auto Tune Threshold – FUNC then L Dn
High / Low Z Select – FUNC then L Up
Full Tuning Cycle – Hold TUNE for >2.5 seconds
Memory Tuning Cycle – Hold TUNE for 0.5 to 2.5 seconds
Toggle Bypass Mode – Press TUNE momentarily

Page 11:

When in Automatic tuning mode, the Z-11ProII will begin a tuning cycle any time that there is forward RF power, and the measured SWR exceeds a preset threshold. In

Semiautomatic tuning mode, a tuning cycle will only begin when specifically requested by pushing the TUNE button on the front of the tuner, or by pushing the TUNER/CALL button on an appropriately interfaced compatible transceiver.

Page 13:

Toggle Automatic / Semiautomatic Tuning Mode As described above… To toggle between the two, press and release the FUNC button, and then press the C DN/AUTO button. When Automatic tuning mode is selected, the inner two LEDs will blink. Press FUNC and then C DN/AUTO again, and the outer two LEDs will blink, indicating Semiautomatic tuning mode.

Page 12:

Toggle Bypass Mode To toggle between bypassed and active mode, press the front panel TUNE button on the Z- 11ProII momentarily. All four LEDs will flash three times to indicate that the tuner is in bypass mode. Press the front panel Tune button momentarily again to recall the previous tuner settings. The LEDs will flash once to indicate that the tuner is no longer bypassed. This function may be useful if you wish to compare antenna performance with and without the benefit of the tuner’s matching network.