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The stock assembled unit had been flawless.? Now when I try to operate sequencing 2 bands, the controller resets each time it finishes the first band - yes I see the sign-on message flash on the LCD.? Unit has a single BS170.? Until today, it had reset flawlessly, well until the middle of the eclipse - then it took a couple hours off before resetting itself.?

The power supply seems capable of outputting 1 amp or more under regulation - but this homebrew supply was built by another ham - so I have not ruled it out.? Still, I can't see a small current draw causing such action.?

Curious if anyone else has experienced this?? I do plan on building a power supply to replace this one.? I haven't yet inserted a current meter to monitor what is happening.? It had worked for countless hours before this new experience.?

73 Curt WB8YYY

Yep, I had the exact same problem. Better filtering on the power supply fixed it . The cap filtering suggested in the previous post fixed it, I used electrolytics

Tips highly appreciated - I may need them.?

Perhaps also this thing uses more current than I think?? I can't find documented the current of the 3S nor the GPS.? Also i realize it varies with PA bias ... and the backlight setting.? I had wired mine to allow backlight adjustment - but never changed it.? Now that I reduce the backlight, the 3S is working flawless again.? As I see no regulation inside the 3S -- likely (to my surprise) I was up against the stops of this so called 1 amp supply - either with current under regulation or its manners when feeding a lot of current.?

I plan to build a better 5 volt supply -- with sufficient capacitance.? I had this homebrew (from another ham, now SK) open briefly - I did not count the uF's -- but there may not be quite enough.? It has a couple TO-whatever regulators bolted to the case (one for 5 volts and one for 12 volts) that likely aren't up to modern standards.?

I have enjoyed some cool radiation with 100 to 300 mW with this nifty transmitter.? Thanks again.?

Curt WB8YYY

Daniel

There is so much space in the 3S case I am thinking to build a PS as you describe -- curious how many uF of filtering you are using, in addition to the 2 small caps to keep the regulator stable??

I am thrilled with the 80 to 10 meter spots running barefoot - so 5 volt regulation inside is a good thing.? I may build a small PA only for 160m use - as my vertical isn't that efficient.?

Curt