Re: bitx40 display flashes and audio clicks when powered on.
|
Guys thanks for all the input. I'm going to be doing some more troubleshooting tonight and we shall see what we come up with. I've ordered some irf510's just I case but I am highly suspecting that is the issue.? I'll post here what I find. 73's KE0AJP
On Feb 15, 2017 4:42 PM, "John Backo via Groups.Io" <iam74= [email protected]> wrote: Regarding the IRF510:
There is no power on the gate on RX, but there is power on the drain, whether the connected
PA is to the to the Vcc source or another power source (though it is possible to have a second,
switched source for PA).
This sounds like a classic avalanche situation. Since he is feeding the rig with 1.5A max,
it is probably shutting down the regulator in that supply. That resets and begins the cycle
all over again with each TX power-up. First, set RV1 to zero volts on the gate on transmit.
If it still happens (which it probably will) then the IRF510 is bad and should be replaced.
Note that when this is done, start the TX alignment with RV1 at the zero level. You may also
have to adjust R136.
As above, the display problem is probably a contrast adjustment since RX appears to be ok.
john
AD5YE
|
