[Elecraft] K3 and FLDIGI Question
Joe Subich, W4TV
lists at subich.com
Mon Nov 24 21:24:21 EST 2014
I'm saying with a properly configured Windows system, there should be
no need to adjust the "TX Attenuator" in Fldigi and doing so can only
cause instability.
As long as each digital program is set for maximum level (maximum
digital gain) and the Windows Mixer control for that program is at the
same level as the hardware output level for that card, each program
will generate the same maximum output level. In this condition,
reducing the "TX Attenuator" in fldigi (or "digital output level" in
MMTTY, MMVARI, etc.) can only reduce the audio level for that program
and cause under drive with the attendant power instability in the K3.
73,
... Joe, W4TV
On 2014-11-24 8:53 PM, Bob NW8L wrote:
> Sigh. I don't see how you read that into my message. I am *not*
> advocating using the Fldigi attenuator to adjust transmit level in the
> K3. That ofcourse is done with the K3 power setting, with the K3 input
> control set for 4-5 bars ALC indicated.
>
> I'm saying only that the attenuator can be used to establish the level
> from flidigi to the soundcard, e.g. to equalize it (if possible) with
> the output of other programs so that the soundcard and K3
> settings don't have to be touched when switching between them.
>
> Bob NW8L
>
> On Mon, 24 Nov 2014, Joe Subich, W4TV wrote:
>
>>
>> On 2014-11-24 11:14 AM, Bob NW8L wrote:
>>> Fldigi has a TX level *attenuator* control on the status bar (to the
>>> left of the AFC button) that can be used to trim the TX level. It can
>>> be used to adjust levels downward to match those of other programs.
>>
>> The K3 *can not* adjust transmit level (power output) by reducing audio
>> drive. If you reduce drive below the ALC threshold, power output will
>> become unstable and "drift". Set your sound card output to a fixed
>> level (typically 60 to 80% of maximum), adjust the K3 Line IN control
>> for four to five bars of ALC, then adjust desired power output using
>> the K3 PWR control.
>>
>> Any other procedure risks unstable power output (low end) or significant
>> distortion (high end).
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>>
>> On 2014-11-24 11:14 AM, Bob NW8L wrote:
>>> Fldigi has a TX level *attenuator* control on the status bar (to the
>>> left of the AFC button) that can be used to trim the TX level. It can be
>>> used to adjust levels downward to match those of other programs. It's
>>> not labeled and is often overlooked.
>>>
>>> Bob NW8L
>>>
>>> On Sun, 23 Nov 2014, david Moes wrote:
>>>
>>>> Be Carfull you really should have four bars and fifth blinking if
>>>> its below that you can get some strange fluctuations on the output
>>>> power. so a compromise between programs is not the best idea. When the
>>>> K3 is in DATA A mode the mic gain will adjust the level for the line
>>>> in so adjustment when using different programs is easy.
>>>>
>>>> level differences can be a problem with running multiple programs
>>>> for digital as they seems to have different algorithms and different
>>>> output levels I no longer use FLdigi and have moved to MMVARI as it
>>>> has internal TX level adjustment that is independent of the soundcard
>>>> level. with this I can match the output with the WSJT-X and
>>>> MMSSTV. I can't seem to find this independent control for FLdigi. I
>>>> have only tried Coacomodem some time ago but I believe it too has an
>>>> independent level control that may help in matching levels with other
>>>> programs although I cant remember if that setting is linked to the
>>>> windows levels or not
>>>> I don't believe that WSJT-X has this though.
>>>>
>>>> David Moes
>>>> President: Peterborough Amateur Radio Club.
>>>> dmoes at nexicom.net
>>>> VE3DVY, VE3SD
>>>>
>>>> On 11/23/2014 18:06, James Bennett wrote:
>>>>> John - thanks - that hit the nail on the head for me. The setting I
>>>>> had on
>>>> my external audio card?s output control was sufficient given the K3?s
>>>> Mic level that I was using with cocoaModem and WSJT-X. However, as you
>>>> pointed out, it was not sufficient enough for FLDIGI to ?tickle? the
>>>> K3. So - I increased the audio card output a bit until I saw the K3?s
>>>> ALC bars light up, then backed down on the K3?s Mic gain. Now it?s
>>>> working just fine with FLDIGI, cocoaModem, and WSJT-X.
>>>>>
>>>>> Much appreciated for the replies from both of you - case closed!
>>>>>
>>>>> 73, Jim / W6JHB
>>>>>
>>>>>> On Sunday, Nov 23, 2014, at Sunday, 2:13 PM, John Nelson
>>>> <john at happyvalleybiz.com> wrote:
>>>>>>
>>>>>> The same thing happens in my setup, if the audio level from the
>>>>>> sound card
>>>> to the K3 is too low. Nothing will appear in the ALC window, no
>>>> matter how high I turn up the mic gain. Once establishing a minimum
>>>> audio level, the ALC will show four bars with the fifth flickering at
>>>> a mic level of 7. It's very touchy for me to get just right, but I am
>>>> probably using sub-optimal sound cards. Works fine, though, for all
>>>> the digital modes.
>>>>>>
>>>>>> John / W3DN
>>>>>>
>>>>>>
>>>>>> On 11/23/2014 4:34 PM, James Bennett wrote:
>>>>>>> Hi david - thanks for the reply to my post.
>>>>>>>
>>>>>>> Unfortunately, no improvement. I have everything set exactly as you
>>>> suggest (it was already that way) and the result is the same. I type
>>>> in some text, press T/R and: the K3 goes into transmit mode, RF flows
>>>> out the radio to the antenna, but no ALC indication on the K3 ALC
>>>> meter. I shut down FLDIGI, bring up cocoaModem and do EXACTLY the same
>>>> thing with absolutely no changes, and I get the RF out, but with the
>>>> fifth ALC bar flickering. Funky, huh?
>>>>>>>
>>>>>>> Jim / W6JHB
>>>>>>>
>>>>>>>
>>>>>>>> On Sunday, Nov 23, 2014, at Sunday, 6:18 AM, david Moes
>>>> <dmoes at nexicom.net> wrote:
>>>>>>>>
>>>>>>>> Its not normal verify that you have the correct sound card
>>>>>>>> selected in
>>>> FLdigi and that the levels are set correctly.
>>>>>>>>
>>>>>>>> In the setup under configure sound card first tab
>>>>>>>> "devices" I have port audio set to the sound card for the rig
>>>> (soundblaster in my case)
>>>>>>>> under "settings" sample rate is native and converter is medium
>>>> interpolation. and corrections all 0 and
>>>>>>>> third tab "right channel" all buttons are clear unchecked.
>>>>>>>>
>>>>>>>> David Moes
>>>>>>>> VE3DVY, VE3SD
>>>>>>>>
>>>>>>>> On 11/22/2014 17:15, James Bennett wrote:
>>>>>>>>> I?ve been using cocoaModem on my iMac for PSK31 QSO?s. Also, I use
>>>> WSJT-X for JT65 and JT9. Recently downloaded FLDIGI v 3.22.01 and gave
>>>> it a try. It works, but?..
>>>>>>>>>
>>>>>>>>> When I transmit, I get absolutely no indication of RF being sent.
>>>>>>>>> The
>>>> K3 goes into transmit mode, but I get no ALC action on the K3 meter. I
>>>> know I?m getting RF out because (1) my KPA500 (in standby mode) is
>>>> showing 30 watts, and (2) I?ve had several QSO?s on PSK31. If I bring
>>>> up cocoaModem and transmit, I get the ALC action that I?m used to
>>>> seeing: the fifth bar flickering. Same thing with WSJT-X. But for some
>>>> reason, when I transmit with FLDIGI - nada, zip, zero indication.
>>>>>>>>>
>>>>>>>>> Is this ?normal?? If so, how would one ever set audio levels w/o
>>>>>>>>> having
>>>> any indication of audio actually flowing? What do I have set wrong?
>>>>>>>>>
>>>>>>>>> Thanks, Jim / W6JHB
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>
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