Hi Hal, The numbers themselves have meaning to the DACs inside the K3, but in terms of actual units I don't know. The key thing is that as those values are increased, the drive levels from the TX DACs are increased, though I don't know if the relationship is a linear one.
The gains of the LPA and PA stage transistors fall off at higher frequencies, so one might expect TX Gain parameters on those bands to be somewhat higher than on the low bands. However, if two immediately adjacent bands have very different TX gain parameter values, the likelihood is that something is amiss in one of the filters (either BPF or LPF) and the associated relays that select the filters. 73, Mike, K8CN ________________________________ From: dyno lab <dyno...@comcast.net> Sent: Tuesday, March 5, 2024 11:19 AM To: Michael Carter <mike.car...@unh.edu>; Michael Carter via Elecraft <elecraft@mailman.qth.net> Subject: Re: [Elecraft] K3/100 TX problem on 20m [You don't often get email from dyno...@comcast.net. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] CAUTION: This email originated from outside of the University System. Do not click links or open attachments unless you recognize the sender and know the content is safe. Do the TX gain parameter numbers have meaning such as dB or are they just relative numbers ? 73, Hal W7YNC > On 03/05/2024 6:35 AM PST Michael Carter via Elecraft > <elecraft@mailman.qth.net> wrote: > > > Hi Paul, > > Could you please post the TX gain parameters > recorded by the K3 Utility at the 50 watt level > for all bands? > > If there is a significant difference in those gain > parameter values between adjacent bands (say > 30 and 17 meters) and the value on the 20 > meter band, that may be an additional clue. > > The bandpass filter bank may be at issue here > since you've checked the appropriate LPF. > If there's a problem with the relay contacts > on the relevant BPF or LPF section, that may > also reduce the TX signal level and force > an elevated TX Gain parameter value for that > band. > > Keith, WE6R has a checklist of steps to > try when diagnosing low TX output power. > I recall he said to contact supp...@elecraft.com > for that document. > > 73, > Mike, K8CN > ______________________________________________________________ > Elecraft mailing list > Home: > https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmailman%2Flistinfo%2Felecraft&data=05%7C02%7Cmike.carter%40unh.edu%7C819ad4896e5c4ba83bad08dc3d302780%7Cd6241893512d46dc8d2bbe47e25f5666%7C0%7C0%7C638452524255589277%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=eyHE0pZxH1RpTxfILI5NkjJ9%2FIRShoLMBS1eUQch7g0%3D&reserved=0<http://mailman.qth.net/mailman/listinfo/elecraft> > Help: > https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmmfaq.htm&data=05%7C02%7Cmike.carter%40unh.edu%7C819ad4896e5c4ba83bad08dc3d302780%7Cd6241893512d46dc8d2bbe47e25f5666%7C0%7C0%7C638452524255599937%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=ozOJqh7OFhA1gx3GIw1f%2FV97eeYPypoWmsHCcYTgDqU%3D&reserved=0<http://mailman.qth.net/mmfaq.htm> > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: > https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net%2F&data=05%7C02%7Cmike.carter%40unh.edu%7C819ad4896e5c4ba83bad08dc3d302780%7Cd6241893512d46dc8d2bbe47e25f5666%7C0%7C0%7C638452524255606140%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=5FOFS4Ml1hDX630X%2BGsrfxZAuMD4mN7DpOcrEL9Qy2M%3D&reserved=0<http://www.qsl.net/> > Please help support this email list: > https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net%2Fdonate.html&data=05%7C02%7Cmike.carter%40unh.edu%7C819ad4896e5c4ba83bad08dc3d302780%7Cd6241893512d46dc8d2bbe47e25f5666%7C0%7C0%7C638452524255610908%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=p03sSEuCZI0sLthx6LTBr14T7Xm4582hA0enkk8coBE%3D&reserved=0<http://www.qsl.net/donate.html> > Message delivered to dyno...@comcast.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
