Page 1 of 1
Low power
Posted: 10 Nov 2022, 16:01
by CT7ARQ
I have a second unit bought some time ago.
Yesterday I fired up and can only get 0.20, 0.25w powered by 13.8v.
I remember wen I assembled it gived me full power all bands around 5w
Could the transistors been blown?
Re: Low power
Posted: 10 Nov 2022, 17:05
by dl6sez
Hello OM,
if it first was 5W and now it is 0,25W or so, there should be a damage at one or more PA FETs.
Have you measured current consumption at TX?
Maybe one FET is getting very hot now.
It could also be a bad contact of the connectors between the two PCBs now...
73 de Chris
Re: Low power
Posted: 10 Nov 2022, 22:26
by CT7ARQ
I noticed one is getting hot.
Will get some replacements to put.
Thank you for the help.
Re: Low power
Posted: 14 Nov 2022, 22:44
by CT7ARQ
Problem solved on the second switch of transistors.
Checked an assortment os bs170 I have and chose 3 off them. Soldered and no power output , than Afther a coffee I realized that I had used a non protected iron, so I have damadge the transistors. Using a good iron station replaced again and now is all OK.
Bs170 are sensitive to ESD damage so be careful everyone.