Probably, but even if I shift downwards in DATA A mode, there's still
a cut-off at 200Hz.
~iain / N6ML
On Fri, Aug 12, 2011 at 11:47 PM, Guy Olinger K2AV
<[email protected]> wrote:
> Isn't SHIFT remembered separately? 73, Guy.
>
> On Fri, Aug 12, 2011 at 6:28 PM, iain macdonnell - N6ML <[email protected]>
> wrote:
>> On Fri, Aug 12, 2011 at 10:12 PM, Joe Subich, W4TV <[email protected]> wrote:
>>>
>>> > I just looked at my passband, with spectran, in DATA A and USB modes
>>> > with the bandwidth cranked up to 4.0kHz (in both cases) with a 2.7kHz
>>> > filter. Indeed, the passband seems to be cut off at about 200Hz on the
>>> > low end in DATA A mode, but not in SSB mode. What's that about?
>>>
>>> That should not be a problem since applying modulation (audio tones)
>>> that low will result in "tilt" on transmission in any case. In my
>>> experimentation with JT65 on HF working below 300 Hz or so resulted
>>> in power output varying with the specific tone even in DATA A with
>>> no TX EQ presumably due to the skirts of the roofing filter on TX.
>>
>> Yeah, I wouldn't suggest transmitting that low in the AF range, but
>> one might be able to decode a received signal down there (then perhaps
>> QSY down 1kHz and call him, if interested).
>>
>> In any case, I find the discrepancy between the passbands of DATA A vs
>> USB modes curious - can anyone (Lyle?) explain it?
>>
>> ~iain / N6ML
>>
>>
>>
>>
>>> On 8/12/2011 4:52 PM, iain macdonnell - N6ML wrote:
>>>> "DATA A" *is* USB with no equalisation, etc - that's the point. It
>>>> allows you to easily switch between SSB and data modes without having
>>>> to adjust audio processing for each.
>>>>
>>>> I just looked at my passband, with spectran, in DATA A and USB modes
>>>> with the bandwidth cranked up to 4.0kHz (in both cases) with a 2.7kHz
>>>> filter. Indeed, the passband seems to be cut off at about 200Hz on the
>>>> low end in DATA A mode, but not in SSB mode. What's that about?
>>>>
>>>> http://www.dseven.org/ar/passband.png
>>>>
>>>> ~iain / N6ML
>>>>
>>>>
>>>>
>>>>
>>>> On Fri, Aug 12, 2011 at 8:40 PM,<[email protected]> wrote:
>>>>> I continue to be puzzled by this thread. Given that WSJT (all modes) is
>>>>> WRITTEN for use on USB by Joe Taylor, WHY would we be interested in
>>>>> utilizing any K3 mode but USB?
>>>>>
>>>>> I have operated 441 and JT65 utilizing my K3 off the Moon, tropo and MS
>>>>> with no desire to fuss with any other K3 "mode". The K3 works great on
>>>>> USB ... end of story.
>>>>>
>>>>> Here, USB, no equalization, 2.7Khz filter (5 pole), no compression. M
>>>>> Audio Delta 44 Soundcard, XP dual core machine and no "audio" interface
>>>>> and a homebrew Opto-isolator for PTT
>>>>>
>>>>> In the log::
>>>>>
>>>>> 34 - QSOs JT44
>>>>> 702 - QSOs JT65
>>>>> 35 - QSOs JT6M
>>>>> 1057 - QSOs 441
>>>>>
>>>>> Many hours of HF WSPR as well.
>>>>>
>>>>> Not all with the K3 ... but many!!
>>>>>
>>>>> What am I missing???
>>>>>
>>>>> Respectively, Bill K0AWU EN37ed ....
>>>>>
>>>>>
>>>>> ______________________________________________________________
>>>>> Elecraft mailing list
>>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>>> Post: mailto:[email protected]
>>>>>
>>>>> This list hosted by: http://www.qsl.net
>>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>>
>>>> ______________________________________________________________
>>>> Elecraft mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:[email protected]
>>>>
>>>> This list hosted by: http://www.qsl.net
>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[email protected]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[email protected]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
