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Thank you jiripolivka for the reply, although I didn't quite understand the remark about using the available connector.
My RF module ( ) has 50 Ohm RF output to which I connect (through 50 ohm microstrip line) my quarter wave wire antenna - directly soldering to the PCB pad. Normally these...
Hi,
I am working on a small project involving wireless communication using short range RF modules.
I am considering selling products based on that project. From the legal standpoint, as a manufacturer, I am obligated to ensure my product complies with regulatory requirements concerning...
I'm using PIC16LF1503 and PIC16LF1517 (voltage range of the MCUs is 1.8V - 3.6V), for both the problem is the same . Both ports are set as digital outputs. The software is not definately a problem. The problem is hardware. The attached figure (from PIC16LF1517 datasheet page 332 **broken link...
For bicolor red/green LED, in this circuit, ideally I could have 15 mA current for R = 87 ohm (in case of a red LED and Vled=1.7V). But all I can get is about 2.5 mA. Why? Because when I set one pin HIGH and the other LOW, the HIGH state is not 3V and the LOW state is not 0V (in my case HIGH is...
Hi
I want to drive a two lead bicolor LED with a MCU. The circuit ( simplified
schematic ) runs at 3V, max. sourced/sunk current by output pins is 25 mA . My problem is low driving current. Theoretically, Output High Voltage on MCU pin equals supply voltage 3V, Output Low Voltage equals...
These measurements are according to ETSI 300 220 Harmonized European Standard ( https://www.etsi.org/deliver/etsi_en/300200_300299/30022001/02.04.01_60/en_30022001v020401p.pdf ) . Table on page 41 shows spurious domain emission limits. According to the table, the limit between 470 MHz and 862...
Hi
There is an RF module ( **broken link removed** ). The module's datasheet on page 8 clearly states that it complies with ETSI regulatory requirements. On manufacturer's site there are also measurement reports (RFM69W-869 ETSI Testreport), based on which I have certain doubts if it is...
Hi
Some pic microcontrollers (in my case pic16LF1503) - when MCLR is enabled - have MCLR pin internally connected to Vdd through a weak pull-up. My question is: Does it mean that I do not have to use external pull-up resistor to tie up MCLR pin to Vdd? I've been searching for a definite answer...
I corrected the pcb design ( ). I have one more question. If antenna "sees" ground plane even if it is under components and traces (a least influence of top layer traces and components is neglible ) can I use Vdd Power pour plane on top layer. Will it have significant effect on rf performance?
Thank you biff44. I didn't really notice this spacing problem. Now I made the center contact 33 mils away from the ground plane pour ( ). About this air gap, will 40 mils do fine ( smd sma has it about 40 mils)?
Well, I could but it would complicate my project a lot because of some enclosure size and mounting constraints. I'd like to use straight sma if disadvantages of that kind of placement aren't significant.
Hi
I'm designing a two-layer pcb with an RF module on it ( ). I'm connecting the module to an antenna (1/4 wave dipole) using an sma connector (https://www.tme.eu/en/details/sma-13/sma-smb-smc-connectors/# ) and a 50 ohm microstrip line. My frequency of operation is 868 MHz. I'd like to...
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