DIY kits 70W SSB linear HF Power Amplifier For YAESU FT-817 KX3
Hi, this is one of those Chinese kits that came with no instructions. I have found some help on the internet but I can't seem to work out how to wind the transformers and inductors. This is a link to...
View ArticleBluetooth Signal Jammer?
Hi, I am a newbie to this forum so please be gentle. My neighbours are causing an absolute nuisance with their loud "urban" music. It's driving me absolutely crazy. I have exhausted all avenues to...
View ArticleBFSK Baseband Constellation
What should the constellation diagram for a BFSK Baseband signal look like ? I was expecting to see 2 points overlapping to 1 point on the real (or in phase, I ) axis, with a modulus of 1. However...
View ArticleParkes large hyperbolic radio antenna
Does anyone know the sensitivity of the Parkes radio antenna and the units?
View Articleoops.... here's why you need to familiarize yourself with how RF devices...
https://www.dailywire.com/news/46996/people-small-ohio-town-couldnt-open-their-cars-or-ashe-schow yes, you are allowed to home-build RF devices for testing and learning, but be aware that the RF does...
View ArticleFM TRANSMITTER WITHOUT A TRIMMER CAPACITOR
Good day genius. Please I have been working on a project now but had being handicapped because there is no trimmer capacitor (variable capacitor: 5pf-100pf) at my end. All attempt to secure some had...
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Class E amp in LTspice
Hi All: I spent a few hours tweaking this using common parts to about 90% efficiency. It can do more power out with a > 36V supply. No AM modulation , yet.
View ArticleObject Identification Help: Likely part of an old Military Radio
Hello everyone. Hopefully this is the right place to post this, I've been asking all over the internet for help identifying this object I have pictures of and this place seems like an active place to...
View Articlefm-am transmitter/receiver
Hello, I am wondering how to superimpose a square wave input signal onto a fm carrier signal?
View ArticleWhat is the pinouts for this module?
I specially need those 4 pins togather on one aide of this module.
View Article4 port Wilkinson combiner / splitter question
I am sad to say my maths are far below the required to work out inductance and capacitance values for a 4 port Wilkinson combiner based on this YouTube video linked below. I successfully made a 3 port...
View ArticleWide Band Antenna for 100MHz-6GHz Hand-held Spectrum Analyzer
I have purchased a secondhand Anritsu hand-held spectrum analyzer that covers the range from 100MHz up to 6GHz. The intended use is to take background EMI readings over that entire frequency spectrum...
View ArticleCat6 connectors worked but Cat 5e connectors did not for a Cat 6 cable that...
I described this issue here https://www.electro-tech-online.com/threads/cat6-cable-failure.155687/ where I found that my Cat 6 buriable, waterproof cable (about 230' long) had been severed by a rodent....
View ArticleDetails of EV1527 Protocol
Looking for someone who can answer questions regarding the elusive EV1527 protocol as used in 433 MHz UHF remote controls. Sample question: If I understand correctly, the transmitter 20-bit ID is...
View Article125kHz RFID Reader and Huge Field Antenna
Hello everyone Link I'm working this circuit for a weeks. But i can't seem to understand full details and it's working since i'm almost newbie to Radio Communications. So i have few questions on this...
View ArticleI am getting wrong parity bits from RFID tag
Hello everyone! I am working on a project making RFID reader by myself. I follow this circuit and check the output using oscilloscope. Data must have a framed like this. But i am getting wrong parity...
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Huge Area RFID Reader
Hello everyone I'm trying to make a RFID reader with diameter of 1.5 meters. So far i managed to work 125kHz RFID reader with 12 cm diameters. But yesterday i tried coil antenna with 35cm diameter and...
View ArticleIMPEDANCE MATCHING IN RF ON PCB BOARD USING HELICAL ANTENNA
Hello everyone I am working on this board in which I have to achieve 50 OHM impedance matching using the helical type of antenna and receiver as LIZARD IC but I am unable to get the desired value even...
View ArticleGenerating The 27Mhz sine Wave form
Does any one have idea how to generate the waveform as shown in the attached image i need a signal of 27Mhz which on for 100 microseconds and off for 900 microsecnods.Thanks
View Article27.12 MHZ Crystal
Helo All how to generate a 27.12 Mhz sine wave from a xtal oscillitor .I have to design this Using only 3 volts battery as i have to use this to design a small prototype of threaphy device for healing...
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