[Elecraft] kxusb question

Joe Subich, W4TV lists at subich.com
Sun May 7 23:05:54 EDT 2017


On 5/7/2017 5:50 PM, Nr4c wrote:
> Well I just put a scope on a KXUSB connector and it measures 5.04
 > Volts DC.

It may measure +5.04V "at rest" but when data is flowing it will be
+/- 5.04 volts as RS-232 is a bi-polar signal.

*DO NOT* connect the KXUSB to an Icom transceiver as the Icom CI-V
signal is TTL compatible (+5V/0V).  The negative signal (-5V) will
damage the Icom CI-V port.

73,

    ... Joe, W4TV


On 5/7/2017 5:50 PM, Nr4c wrote:
> Well I just put a scope on a KXUSB connector and it measures 5.04 Volts DC. So I really think it will work as long as you combine the Ring and Tip  signals to the Tip of a plug for the ICOM
>
> Also note that the program interface on ICOM Dual Band Mobiles is on the Ring of one of the Speaker jacks. It's also CI-V. At least this worked on my 2720 years ago.
>
> Sent from my iPhone
> ...nr4c. bill
>
>
>> On May 7, 2017, at 12:20 PM, Harry Yingst via Elecraft <elecraft at mailman.qth.net> wrote:
>>
>>
>>
>> I worked with the Icom CI-V interface years ago when I was building frequency agile remote bases
>>
>> The CI-V is TTL  (5 volts),
>>
>>
>> While I have not put an Elecraft KXUSB on a scppe to look at the signal levels I'm gong to say No.
>> My logic is that the Elecraft May be able to use TTL, The Elecraft Will use RS-232 Levels
>>
>> If you look at the Elecraft W2 Manual it shows how to wire an interface that goes directly to the DB-9 Pins
>> (I'm using the W2 here because it's easy to see what is going on) upon looking at the schematic for the W2
>> you can see how they are level converting from Serial levels to TTL Levels.
>>
>> In short Elecraft builds the Level converter into the gear Icom does Not.
>> Additionally Icom ties the TX&RX lines together.
>>
>>
>>
>>
>>
>>
>>
>>
>> ________________________________
>> From: barry whittemore <wb1edi at hotmail.com>
>> To: Elecraft <elecraft at mailman.qth.net>
>> Sent: Sunday, May 7, 2017 8:04 AM
>> Subject: [Elecraft] kxusb question
>>
>>
>>
>> I have a KXUSB and was wondering if i can use it with an ICOM 706. I am going to do a trip with the 706 for the June VHF contest and think it is basically the same except that it has a stereo plug and the 706 is mono. is the ring in the KXUSB used? I do not wish to damage either thing.
>>
>>
>> Thanks
>>
>>
>> Barry
>>
>>
>> NF1O
>>
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>
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