Il 09/mar/2019 17:16, "iz oos via Groups.Io" <and2oosiz2=[email protected]> ha scritto:
Thanks Arv, I will try it! I had installed under Linux via wine so following your hints I can start with it!
Il 09/mar/2019 15:46, "Arv Evans" <arvid.evans@...> ha scritto:
Iz Oos
Using LTSpice is not all that difficult (I learned it and I'm not that brilliant).
There are two parts to learn.? First is the schematic editor that is intuitive once you know some basic select-and-place moves.? After you have the schematic complete you would select voltage sources and measuring points.? The rest is mostly automatic when you select "RUN" mode.
Start with a small circuit segment to get a feel for how it works and then build on that experience.? In a few hours you will be an expert.
LTSpice is FREE and will run on Windows or any version of Linux with Wine installed.??
What about adding a capacitor (like a 180pf or maybe a higher value) in parallel with r83? Would it increase the 10m power output without decreasing the output in the other bands (I wish I knew how to use LTspice)?
Il 02/mar/2019 11:47, "iz oos via Groups.Io" <and2oosiz2=gmail.com@...o> ha scritto:
I replaced the cap at the emitter of Q90 with a 470pf instead of the 0.1nF. In the meanwhile I replaced the bifilar antenna wire with a short coax. Output power on 40 marginally diminished from 15 to 12.5w about. The power on higher bands marginally increased from nearly 2w to nearly 2.5w. But the 'instability' issue with full throttle noise on SSB on 10m has disappeared and I can also not attenuate the Vogad output. Overall I am happy with this one component replacement.
Il 01/mar/2019 08:40, "iz oos via Groups.Io" <and2oosiz2=gmail.com@...o> ha scritto:
Thanks for all the replies. According to the old schematics of my ver. 3 ubitx C81 should be 0.1nF, so I will see what changes with a 470pf as suggested by Farhan.
Il 28/feb/2019 23:58, "ajparent1/KB1GMX" <kb1gmx@...> ha scritto:
BITX V5 as distriibuted.? I believe its part of the Zip file on github. Here is a copy attached.
As far as power amp there were no changes and is the same for emitter cap (c81) on Q90 going back to V3.
