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Recent content by abomin3v3l

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    2.4GHz WiFi module causing interference on 433MHz RF receiver module

    Hi FvM. What kind of filter do you mean?
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    2.4GHz WiFi module causing interference on 433MHz RF receiver module

    I have a prototype board which has two RF modules on it, a 2.4GHz Wifi module (ESP-01) and a low cost 433.92MHz RF receiver module (Wenshing RWS-371F-6). My 433MHz transmitter (a remote control) sends data encoded in manchester to be decoded by the receiver, this part is working well. The data...
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    Cheap RF 433.92MHz design, PCB track antenna, values of capacitors

    I will buy this meter https://www.amazon.com/KNACRO-Precision-Inductance-Capacitance-Accuracy/dp/B06XSD9VN1/ref=mp_s_a_1_2?keywords=LC+meter&qid=1552429075&s=gateway&sr=8-2
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    Cheap RF 433.92MHz design, PCB track antenna, values of capacitors

    I'm going to produce new prototypes on next weeks, and I'll produce 3 versions of the transmitter board: - Rev. B = original prototype with little modifications, but same antenna shape. - Rec. C = new layout with curved/wiggle shape of antenna - Rec. D = new layout with straight shape of...
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    Cheap RF 433.92MHz design, PCB track antenna, values of capacitors

    Hi Brian. Have you seen post # 21? I saw on google, for that LCR meter the range of capacitance is from 25pF to above. Or maybe the minimum scale is 25pF, I do not have sure. Do you think I shold try to prototype the two drawings of antennas from post # 21 or do you think that prototyping the...
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    Cheap RF 433.92MHz design, PCB track antenna, values of capacitors

    The datasheet shows that pin 3 of RF receiver is a linear output. I was monitoring this signal with the oscilloscope today, and the results are attached. Now, I think I can measure the transmitter strenght through this signal.
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    Cheap RF 433.92MHz design, PCB track antenna, values of capacitors

    Brian. I connected a capacitor from colletor to ground. New schematic is attached. I have some doubts: (1) What shape of antenna of the of the pictures is better? curved or straight? Or do you recommend to try both? (2) Do I need to place ground plane (red) where the components of the RF...
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    Cheap RF 433.92MHz design, PCB track antenna, values of capacitors

    Now looking at your schematic, I don't know what to do, because the circuit is a little different. Your schematic have a 3pF in parallel with the antenna. Mine schematic have C4 (470pF), one side of it is connected to the antenna but the other pin is connected to GND. I'm not understanding how...
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    Cheap RF 433.92MHz design, PCB track antenna, values of capacitors

    Brian, thanks for your help. What do you want to mean with "open loop"? I think I understood what you said about 'flood fill' with ground. I can use a 'polygon pour' at the red/top layer of the PCB to have a lower impedance between the ground of the amplifier circuit and the ground connection of...
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    Cheap RF 433.92MHz design, PCB track antenna, values of capacitors

    I'm attaching some pictures: the current schematic (best results until now), Rev.A layout (current), and two possible future layouts Rev.B and C. On next weeks I'll be producing a new prototype PCB panel from boards of other project and I can include 2 or 3 different layouts for that...
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    Cheap RF 433.92MHz design, PCB track antenna, values of capacitors

    I will try the twist capacitor next week. There's an university in my city, I can visit them, I think they have a RF/communications lab with some special equipments, maybe they have a device that can measure the inductance. What is the kind of special equipment that makes that measurements...
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    Cheap RF 433.92MHz design, PCB track antenna, values of capacitors

    With 120R and C2/C3 = 3.3pF the circuit does not work. Until the previous post, the best results were with R3 = 120R, C2 = 1pF and C3 = 1.5pF. So I only changed R3 to 100R and got a little better result, but this improvement can be only an impression, I will keep R3 as 120R, C2 = 1pF, C3 = 1.5pF...
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    Cheap RF 433.92MHz design, PCB track antenna, values of capacitors

    In my own schematic and PCB, original values were: R1 = 47K, R3 = 150 Ohms 1%, C2 and C3 = 1pF As suggested by BratheRad, I decreased R1 from 47K to 22K, decreased R3 from 150 Ohms 1% to 120 Ohms 1%, C2 = 1pF (no change) and increased C3 from 1pF to 1.5pF. With these modifications, I got...
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    Cheap RF 433.92MHz design, PCB track antenna, values of capacitors

    The circuit of RF and the antenna length/drawing were copied from a commercial board of a garage opener, this is why I didn't supplied its inductance value, and also I don't know how to measure it. On original circuit, "RF-TX" signal (R1) was driven by a 0-12V digital signal, and in my circuit...
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    Cheap RF 433.92MHz design, PCB track antenna, values of capacitors

    Hi. I'm doing a RF remote control project using a PCB with microcontroller and with simple onboard antenna layout as transmitter and a 433.92MHz receiver RWS-371F-6 model. Here is the datasheet of the receiver: https://www.es.co.th/Schemetic/PDF/RWS-371F-6.PDF I don't have knowledge about RF...
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