WD8BXS
alter Hase
 Offline
Posts: 286
|
 |
Solved! Trouble with Bias
« on: 29. November 2018, 15:38:00 »
|
|
I have a new Ver 7 on the bench. The Bias will not change with the bias setting.
The voltage going to the Mosfets is changing, but the bias current does not.
I changed the finals, but no change is the result.
Scratching my head!!
Any ideas as to what I am missing??
de Chuck WD8BXS
|
| « Last Edit: 30. November 2018, 22:33:25 by WD8BXS » |
 Logged
|
Thanks,
De WD8BXS vy 73
|
|
|
|
|
WD8BXS
alter Hase
Offline
Posts: 286
|
|
Re:Another NEW Issue - Trouble with Bias
« Reply #2 on: 29. November 2018, 21:38:02 »
|
|
Power supply Transformer?
These are the same finals I have always used from RF Parts.
|
|
Logged
|
Thanks,
De WD8BXS vy 73
|
|
|
WD8BXS
alter Hase
Offline
Posts: 286
|
|
Re:Another NEW Issue - Trouble with Bias
« Reply #3 on: 29. November 2018, 23:02:55 »
|
|
12 volts at the Drain.
4.5 volts at the Gate with Ptt pressed.
no change in bias current.
Do you suggest I put the 3k resistor in the bias circuit to get more bias voltage??
Thanks,
Chuck
|
|
Logged
|
Thanks,
De WD8BXS vy 73
|
|
|
|
|
WD8BXS
alter Hase
Offline
Posts: 286
|
|
Re:Another NEW Issue - Trouble with Bias
« Reply #5 on: 30. November 2018, 22:32:59 »
|
|
Installed another set of Finals, no joy!!
Started re-soldering components and it started working!
A great mystery hihi
Thanks, Chuck
|
|
Logged
|
Thanks,
De WD8BXS vy 73
|
|
|
|
|
Author
...
