Elecraft tech support suspects a bad KPA3A and has arranged for a module swap.
It is nice that you (me) can be so pleased even when you encounter a problem. Great company. Very 73 - Mike - K9JRI > On Aug 1, 2018, at 10:19 AM, Michael Blake <[email protected]> wrote: > > While on the air on 3710 SSB I receive audio reports that say my transmitted > audio is somewhat muffled or nasal. Making adjustments to mic gain, > compression levels, TX EQ seems to make no difference to this report. These > adjustments do change the sound of the audio but do not reduce the reports of > muffled or nasal characteristics. > > I normally run the KPA500 at 500 watts PEP output and the K3s is set to 18 > watts to achieve this output. > > This morning I suspected that this nasal sound might be related to running > the K3s at 18 watts as that uses both the 100 watt amplifier and the 12 watt > amplifier but in series at very low drive levels. As a test I cut off the > KPA500 and ran the K3s at 100 watts and the distortion was gone. As a second > test I dropped the drive to 11.9 watts which dropped off the 100 watt > amplifier module and runs the low power module at almost full power and the > audio was still clean with the KPA500 delivering about 300 watts PEP. > > Is this something that anyone else has observed? Are there any built in > tests or adjustments that might help this issue? I have run the transmitter > gain calibration at all three power levels with satisfactory results. > > Oh yes,…. The condition is the same using a dynamic mic (EV RE50), an > Electret Mic (MH4 & CM500) or mic audio from a USB connected computer (Blue > Yeti). > > Very 73 - Mike - K9JRI > > > > > > > > > > Michael Blake > [email protected] <mailto:[email protected]> > > > > > > ______________________________________________________________ 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 Message delivered to [email protected]
