Adjust ALC in Data A mode, with KX3

[David Douglass-2]

Hi,

I've just re-acquired a KX3, and have been trying it on JT65.

As per recommendations I have been trying to use Data A mode, but trying to adjust the drive level is a nightmare, and getting the required 4-5 bars of ALC has been near impossible. If I switch to USB mode, I can set the drive levels without issue using the mic gain, and adjusting the sound are levels.

I would have assumed that setting drive levels would be the same in USB mode as it was in Data A mode. Is this not the case or do I having something else going on.

Apologies as I appreciate the subject of JT65 has been covered extensively in the past, but I can't figure out why I seem to be able to set things up in USB mode easily, but can't in Data A.

Cheers

David, vk2nu

Sent from my iPad
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[Don Wilhelm]

David,

The most likely problem is that you have too much output from the sound
card.

Try putting a 10 dB attenuator in the cable between the soundcard and
the KX3 MIC input - 100k in series with 10k from the KX3 end of that
resistor to the shield should do nicely.

The KX3 has an audio protection mechanism that kicks in if there is too
much audio, and that makes the MIC level an unreasonable value.

73,
Don W3FPR

On 12/10/2016 6:00 AM, David Douglass wrote:
> Hi,
>
> I've just re-acquired a KX3, and have been trying it on JT65.
>
> As per recommendations I have been trying to use Data A mode, but trying to adjust the drive level is a nightmare, and getting the required 4-5 bars of ALC has been near impossible. If I switch to USB mode, I can set the drive levels without issue using the mic gain, and adjusting the sound are levels.
>
> I would have assumed that setting drive levels would be the same in USB mode as it was in Data A mode. Is this not the case or do I having something else going on.
>
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[James Bennett]

David,

I use my KX3 to run WSPR, JT65, and JT9, using DATA-A. It does take a bit of trial and error, but once you find the “golden settings” between the KX3 and your sound card, things will be fine. I use a Tascam US-125M sound card; its output controls are set to about the 1:00 mark. With them like that, the KX3 gives me 4-5 bars of alc indication when set to about number 9.

Keep trying and you’ll get it going!

Jim / W6JHB

> On   Saturday, Dec 10, 2016, at  Saturday, 7:03 AM, Don Wilhelm <[hidden email]> wrote:
>
> David,
>
> The most likely problem is that you have too much output from the sound card.
>
> Try putting a 10 dB attenuator in the cable between the soundcard and the KX3 MIC input - 100k in series with 10k from the KX3 end of that resistor to the shield should do nicely.
>
> The KX3 has an audio protection mechanism that kicks in if there is too much audio, and that makes the MIC level an unreasonable value.
>
> 73,
> Don W3FPR
>
> On 12/10/2016 6:00 AM, David Douglass wrote:
>> Hi,
>>
>> I've just re-acquired a KX3, and have been trying it on JT65.
>>
>> As per recommendations I have been trying to use Data A mode, but trying to adjust the drive level is a nightmare, and getting the required 4-5 bars of ALC has been near impossible. If I switch to USB mode, I can set the drive levels without issue using the mic gain, and adjusting the sound are levels.
>>
>> I would have assumed that setting drive levels would be the same in USB mode as it was in Data A mode. Is this not the case or do I having something else going on.
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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