Andy

RF junky who escaped from a rehab facility

[Andy @KB7ZUT]

Me: Just one more QSO, please. Mic Cable: I think you have had enough, sir… #hamradio

[Andy @KB7ZUT]

Can you spot the totally missing solder joint on my Siglent power supply encoder ground? It has been slowly driving me insane for the last couple of months. Me: Just increase by 50mV please. PS: how about going all the way to the 32V limit in one step…

[Andy @KB7ZUT]

@MehdiHacks @rdavies6 Nice piece of kit. The documentation looks excellent. Love to hear how the cumbersome (or not) software is on a real project.

[Andy @KB7ZUT]

@g7soz Some PCBs go through a washing process depending on the flux used during reflow. But there are many components in radios (trimmer pots, speakers, DIP switches, etc…) where this is not a good idea. Especially sensitive stuff inside the RF shielding cans. Maybe as a last resort.

[Andy @KB7ZUT]

@cqcqcqdx Working link: https://t.co/2kGtLHCtns

[Andy @KB7ZUT]

@ElectronicsbyJH Cool gear, but the cost to join the Bird clubhouse is a little too steep. I’ll be in the 10+ year old RigExpert cult for now. Too many other lab toys in the queue…

[Andy @KB7ZUT]

@rocketgobrrrrr 👀RTC Battery Backwards? Maybe this ESP-32 that can travel back in time😎

[Andy @KB7ZUT]

@MehdiHacks How many spectrum analyzers do you need? Me: Green.

[Andy @KB7ZUT]

@MehdiHacks @SignalHound 👀👀👀 think of all the potential customers out there running Mac hardware…

[Andy @KB7ZUT]

@rdavies6 @OH8STN @rdavies6 thanks for posting the link to the article. Polar modulation is interesting indeed. The higher efficiency comes at higher complexity because the class D and E power amps are not very broad band and need to be resonated on every band (if not every frequency).

[Andy @KB7ZUT]

@WB4IUY Yikes! I think I would have a peek 🫣 inside to see if it worth the bother. “Wet” would be a definite show stopper for me and would probably cause me to find a new friend.

[Andy @KB7ZUT]

@erickdahan @erickdahan here is my concept of the PD filter. Very likely a bit of overkill, but without knowing the supply and the actual load a bit of a guessimation...

[Andy @KB7ZUT]

@erickdahan And it would look something like this. Let me see if I can come up with some rough estimates on component values.

[Andy @KB7ZUT]

@erickdahan The problem is the power bricks are switch mode supplies and the cheap ones can be very noisy. Not good for RF or Audio circuits.

[Andy @KB7ZUT]

@erickdahan It really depends on the USB-C supply / power brick you are using and how clean the output is. The PD triggers just asks the supply / brick for a certain voltage output. Typically 5V, 9V, 15V, and 20V. 12V sometimes (12v was optional in the PD 2 spec).

[Andy @KB7ZUT]

@erickdahan No! You need more solder!😉

[Andy @KB7ZUT]

@DJIGlobal @Odd_Jayy @alexlindsay this made me think of you. Hope you’re having fun at the fruit co.

[Andy @KB7ZUT]

@erickdahan Erick, the oscillator circuit doesn’t look right at all. You need to have positive feedback for the oscillator circuit to continue oscillating. It looks like the AI drew some form of a tuned circuit with an emitter follower using an NPN transistor.

[Andy @KB7ZUT]

@ibelings wicked! can you put something in the frame so I can pull the dimensions off of it? Also I wonder what the SMT component is on the active element. I would assume the pattern looks something like hemisphere.