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?
Low power
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- Posts: 399
- Joined: 30 Dec 2021, 22:54
Re: Low power
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
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
Chris DL6SEZ, JN48XL near Ulm, Southern Germany
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- Posts: 49
- Joined: 31 Dec 2021, 00:51
- Location: Esposende - Portugal
Re: Low power
I noticed one is getting hot.
Will get some replacements to put.
Thank you for the help.
Will get some replacements to put.
Thank you for the help.
"There are three sorts of people: those who are alive, those who are dead, and those who are at sea"
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- Posts: 49
- Joined: 31 Dec 2021, 00:51
- Location: Esposende - Portugal
Re: Low power
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.
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.
"There are three sorts of people: those who are alive, those who are dead, and those who are at sea"
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