K3 ALC Behavior When Using WSJT-X

[k2te]

I recently had to install a soundcard dongle when my internal card went
TU.  When operating WSJT-X, I notice that the ALC runs the 4-bar
solid/5th-bar flicker normal operation during the transmit cycle.  At the
end of the cycle it jumps to 6 or 7 bars before the receive cycle starts.
 This does not seem to affect the K3 when running barefoot; however, when
using the KPA500, the output spikes almost to 700W at times before the
switchover.

Any suggestions where to point the finger?

73 de Ed

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[Dave wo2x]

I went through a similar problem with a friend who is running an Icom 7700.

Set the power out on the K3 to 10 watts. Key up in RTTY and verify 10 watts out. Now lower the USB data out on the K3 and then click tune in WSJT-X. You want to adjust the USB data out to where the radio just reaches 10 watts out. Any higher and you risk experiencing ALC overshoot and a distorted WSJT-X signal.

On my friend’s Icom this was the point right before the ALC started to give any indication.

Sorry I do not have a K3. Others may chime in and offer advice but this will ensure you are not overdriving.

Dave wo2x

Sent from my waxed string and tin cans.

> On Apr 23, 2020, at 8:17 PM, [hidden email] wrote:
>
> I recently had to install a soundcard dongle when my internal card went
> TU.  When operating WSJT-X, I notice that the ALC runs the 4-bar
> solid/5th-bar flicker normal operation during the transmit cycle.  At the
> end of the cycle it jumps to 6 or 7 bars before the receive cycle starts.
> This does not seem to affect the K3 when running barefoot; however, when
> using the KPA500, the output spikes almost to 700W at times before the
> switchover.
>
> Any suggestions where to point the finger?
>
> 73 de Ed
>
> ____________________________________________________________
> Sponsored by https://www.newser.com/?utm_source=part&utm_medium=uol&utm_campaign=rss_taglines_more
>
> House Approves $484B More for Small Businesses, Testing
> http://thirdpartyoffers.juno.com/TGL3141/5ea22f78512af2f787461st01vuc1
> 50K Students to Get Tablets, Broadband
> http://thirdpartyoffers.juno.com/TGL3141/5ea22f787390f2f787461st01vuc2
> Tests Suggest 1 in 5 NYC Residents Had Virus
> http://thirdpartyoffers.juno.com/TGL3141/5ea22f7895f142f787461st01vuc3
> ______________________________________________________________
> 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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