Activity for leroy105‭

Type	On...	Excerpt	Status	Date
Answer	—	A: Why are posts that users clearly approve of being closed? Definently agree. This original post hits a whole punch of EE topics. Sure, if the OP was an expert in consumer microwaves and WiFi theory and RF and FCC Compliance - they could write an epic post like the Lundin example. If they had background knowledge, I seriously doubt they would be posting th... (more)	—	about 3 years ago
Answer	—	A: Why 3.3V instead of 3V? Actually I think this is a really good question. It's kind of more historical though I guess (and I don't know the historical answer either, but from building products perspective I think this is probably the reason/s). 75V DC is a cut-off value for safety testing on products (OSHA / UL requi... (more)	—	about 3 years ago
Answer	—	A: Filter RF Harmonics With Additional PI Network We got a copy of the hardware and took a first crack using a lowpass Chebyshev filter at 950MHz (radio transmits up to 930MHz). On the first pass, we got a .2dBm drop on the fundamental [margin of error in our test chamber] and a 12db drop on the most severe harmonic. I don't know if the Chebys... (more)	—	about 3 years ago
Question	—	Filter RF Harmonics With Additional PI Network I have a 900MHz radio with a reference design matching network. The radio feeds to a PCB antenna (PCB antenna hasn't been verified with a VNA, and may not be a great match; this is a project to now fix this system). There are over the limit harmonics from the 6th harmonic (5,400MHZ) to (8,100MHz... (more)	—	about 3 years ago
Question	—	ESD USB Shield Connection & Filtering I have a handheld ARM Cortex M based device, which has a USB input port. The product is battery powered and there is no metal chassis. We are going through CE testing, and are having ESD issues at 4kV contact to the USB shield with reproducibility under IEC 61000-4-2. On the data lines of th... (more)	—	over 3 years ago