[Elecraft] K2 Radio interface cable to connect MFJ-993B ATU

[Mike Kopacki]

Nice reply, Joe. I kinda figured that. Fortunately it’s not a deal breaker for me. 

Thanks,
Mike NJ2OM 

> On Jul 5, 2020, at 1:06 PM, Joe Subich, W4TV <lists at subich.com> wrote:
> 
> 
> 
>>> Best to ask MFJ how they detect TUNE mode in the K2, and once you have that answer, we can tell you how to construct the cable for both the PC and MFJ ATU connections.
> Based on the MFJ manual, the 993B is looking for specific protocol
> from the *TUNER* connection of the Kenwood or Yaesu transceivers or
> a contact closure out/contact closure in ("start"/Tuning") of the
> Icom AH-3/AH-4 tuners.
> 
> None of Elecraft's transceivers are compatible with those signaling
> protocols.  Elecraft's transceivers/tuners communicate using Elecraft's
> proprietary "Aux Bus" (protocol).
> 
> I doubt that there is any way to automate the K2/MFJ-993B interaction.
> 
> 73,
> 
>   ... Joe, W4TV
> 
> 
>> On 2020-07-05 11:41 AM, Mike Kopacki wrote:
>> I plan on calling them tomorrow (Monday).
>> Thanks,
>> Mike NJ2OM
>>>> On Jul 5, 2020, at 11:38 AM, Don Wilhelm <donwilh at embarqmail.com> wrote:
>>> 
>>> Mike,
>>> 
>>> It is more complicated than that - there is no TUNE information on the RS-232 lines but if the MFJ ATU has a signal to activate TUNE on the K2, and I do not see any reference to a TUNE signal in the Kio2 Programmer's Reference manual.
>>> 
>>> Best to ask MFJ how they detect TUNE mode in the K2, and once you have that answer, we can tell you how to construct the cable for both the PC and MFJ ATU connections.
>>> 
>>> 73,
>>> Don W3FPR
>>> 
>>>> On 7/5/2020 9:08 AM, NJMike wrote:
>>>> In order to put the MFJ-993B automatic antenna tuner into TUNE mode from the
>>>> radio, an interface cable is required.
>>>> MFJ has cables for the major radio brands. I’m not sure if it’s even
>>>> possible for the K2 since I’m already using the RS-232 port to interface
>>>> with the laptop.
>>>> The cable, I believe, does nothing more than initiate TUNE mode on the tuner
>>>> when TUNE is initiated on the radio.
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