The internal attenuator is only rated for short term usage in cases of over drive or high reflected power. Any hw modification forcing it on will risk damage to the input attenuator components.
73, Eric elecraft.com _..._ > On Aug 24, 2019, at 3:21 PM, Andy Durbin <[email protected]> wrote: > > "I believe that additional attenuation might be helpful if you can implement > it without upsetting the RX path, although on most bands 2 or 3 dB extra > attenuation wouldn't matter." > > Both the KPA500 and KPA1500 have built in drive attenuators (3 dB for KAT500, > KPA1500 unknown) but there seems to be no serial command to activate them > (only control is internal for over-drive protection). It would seem to be a > fairly simple firmware change to allow the user to activate the attenuator > but that would remove a layer of protection from accidental over-drive. > > Anyone willing to make a (minor?) hardware mod could activate the built in > drive attenuator without impacting the RX signal path. > > Like Wes, I'm not surprised he KPA1500 is sensitive to load. I am surprised > that sensitivity is still seen when the load is matched by the internal tuner. > > 73, > Andy, k3wyc > > ______________________________________________________________ > 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] ______________________________________________________________ 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]
