[Elecraft] K3 INTERFACE WITH LDG Z100A

[N4ST - Jim]

I have tried to find a way to interface a K3S with an LDG-200.
It needs a digital to analog conversion interface since the LDG uses discrete voltage levels as inputs for the proper band.  I don't know if the Z100A uses the same analog signaling.
In the mean time, I wrote a macro to drop my K3S to 20Watts, do a TUNE, wait 2 seconds and then cancel the TUNE and bump the power back up to 70W for digital work.
A one-click mouse solution for using the LDG memory auto-tune.
_____________ 
73,
Jim - N4ST


-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Bob McGraw
Sent: Sunday, September 4, 2022 09:35
To: elecraft at mailman.qth.net
Subject: [Elecraft] K3 INTERFACE WITH LDG Z100A

I purchased a Z100A with the idea of interfacing it to a specific brand/model of radio.  I investigated the Z100A requirements to initiate the control of the tuner via the transceiver.   From my earlier work, I don't see there is a command from the K3 that will support the requirements of the Z100A.  However, there are many ICOM radios that do have the provision.  Thus the command comes from the radio.

 From the LDG manual:

"The LDG Z-100A includes the IC-104 DC power cable, as well as a three 
foot IC-100 Icom interface cable. However, interface cables for a 
plethora of other radios are available as an optional purchase, 
definitively making the Z-100A the last tuner you'll ever need to purchase.

Press "Tune" on Tuner - Keys Automatically

  * IC-105 Alinco interface cable - uses EDX-2 jack, DX-70 and DX-77
  * IC-108 Yaesu interface cable - uses TUN/LIN and KEY jacks, FT-891,
    991/A, 857, 897, 100
  * IC-109 Yaesu interface cable - uses TUN/LIN jack, FT-DX10, 1200,
    FT-950, 450 (NOTE: Do not select external tuner in settings)
  * IC-115 Yaesu interface cable - uses LINEAR jack, FT-DX101D, 3000
  * IC-106 Kenwood interface cable - uses AT-300 jack
  * IC-105 Alinco interface cable - SR8T, SR9T"
  * Compatible with any Icom radio that is AH-4 or AH-3 compatible. (6M
    tuning from Tuner button for radios that are only AH-3 compatible)
  * Partial radio list: IC-706, 703, 718, 7000, 7100, 7200, 7300, 7410,
    746, 756, 7600, 7610 (and all variants).

I find nothing to indicate the LDG100Z will interface with the K3.  In reviewing the signals on the ACC connector on the K3, I do not find one dedicated to the TUNE function. See page 20 in the manual, ACC(Accessory I/O)

73
Bob, K4TAX




Message: 13
Date: Fri, 02 Sep 2022 16:46:28 -0500
From: greg best<gbconsulting54 at gmail.com>
To:<elecraft at mailman.qth.net>
Subject: [Elecraft] K3 INTERFACE WITH LDG Z100A
Message-ID:<75A8CCF8-062B-4C74-94D9-D6B51D5D2A78 at contoso.com>
Content-Type: text/plain;	charset="UTF-8"

I have tried to find a cable that goes from my K3 to the LDG Z100A tuner but all I see is just a cable with a Molex like connector going to the tuner and nothing on the other end of the K3 except bare wires (i.e. no connector). Does the tuner have to get connected to the K3 ACC jack?? Or does someone have a wiring diagram so I can marry the correct connections between the 2 units?

  

73?s,

Greg N9GB

O
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