>> I'm sorry, perhaps I'm mistaken, but I've already hooked up my K3
>> using a serial to USB converter cable, and then turned on
>> Spectrogram and found that the audio IS already there. Do I have a
>> voodoo K3, or is someone else mistaken that this feature already
>> exists?
No, you probably don't realize that Spectrogram uses the default
audio input device and that Windows systems commonly default to the
computer's built-in microphone. You are probably getting nothing more
than "acoustic coupling" between the K3 speaker and the computer's
mic. This assumes that you have not intentionally configured the
K3 and computer to use a cable between the K3 Line Out jack and the
computer's Line In jack and made that the default.
There is no audio connection to the K3 RS-232 port ... read the
schematics!
73,
... Joe, W4TV
On 11/19/2010 12:32 AM, The Smiths wrote:
>
> I'm sorry, perhaps I'm mistaken, but I've already hooked up my K3 using a
> serial to USB converter cable, and then turned on Spectrogram and found that
> the audio IS already there. Do I have a voodoo K3, or is someone else
> mistaken that this feature already exists?
>
> T Smith
> SWL
>
>> Date: Thu, 18 Nov 2010 20:20:33 -0500
>> From: li...@subich.com
>> To: k2qi....@gmail.com; elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] K3: USB port
>>
>>
>> Moving from RS-232 to USB for commands (CAT) is trivial - replace
>> the DB9 with one of the FTDI devices that is a USB to RS-232
>> converter built into the DB9 socket. However, that does not get
>> you audio ...
>>
>> To do audio, you would need not only the USB converter but a hub
>> and USB Audio CODEC (e.g. PCM8902 or similar). Then Elecraft
>> would need to build controls for the USB CODEC (ADC/DAC) and do
>> all the other software support - further burdening the K3 CPU.
>>
>> After all that, all you've done is move the USB soundcard, USB
>> to serial converter and USB hub into the K3 and added a whole new
>> level so support burden - providing operating system specific
>> drivers for each version of Windows (along with the cost of
>> signing drivers with Microsoft), specific drivers for each version
>> of OS-X, and specific drivers for each unique version of LINUX.
>> By the way ... depending on the USB Audio chip set (ADC/DAC) and
>> USB hub, you might find yourself needing specific drivers for each
>> chip (Audio, hub, control) *and* EEPROM to customize, control and
>> serialize each of those chip!
>>
>> After all of that you have not provided any new capability for
>> the K3. Other than adding at least $100 per unit in hardware,
>> development, and ongoing support costs the only thing this exercise
>> will accomplish is to relieve a relatively small number of users
>> of the need to purchase a KUSB and allow them to keep their sound-
>> card free for iTUNES. For all the rest, you have increased the
>> cost of the K3, added an entirely new level of complexity to the
>> rig, and perhaps required that the user purchase new hardware to
>> use their rig with computer control.
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>> On 11/18/2010 7:31 PM, James Sarte (K2QI) wrote:
>>> Hello group,
>>>
>>> I know Wayne has mentioned several times in the past that they had
>>> considered all possibilities when it comes to PC interfaces for the K3,
>>> including USB. In fact, he says the following on 16 June, 2009:
>>>
>>> "The KIO3's digital I/O module could be replaced with one that has USB
>>> rather than RS232 -- or better yet, both. We planned for this.
>>>
>>> The reason we went with RS232 initially is that many hams are still
>>> using PCs that have only RS232 ports. Those who prefer to use USB can
>>> use an inexpensive USB-to-RS232 adapter. There is no difference in I/O
>>> performance between the two methods. "
>>>
>>> Just wanted to revisit this topic and find out if anyone has heard anything
>>> more regarding a possible USB interface for the K3. I know it's not for
>>> everyone, but for myself and perhaps others out there, the ability to carry
>>> all data, including audio on a single cable would be convenient. Right now,
>>> I'm using a Keyspan USB to RS232 adapter for data, along with two separate
>>> stereo cables for audio. I don't have any real complaints with that setup,
>>> but could be problematic when transferring the rig around from computer to
>>> computer.
>>>
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