radio

Hello, A week ago I bought an old volvo cr 905 headunit. But I am encountering a weird issue. When I play cassettes or cds the radio works flawlessly. But when I play FM radio it works but not good. The first 5 minutes the fm works good but after that it starts to stutter and lowering volume...

I'm trying to launch a high-altitude balloon later this Spring or Summer, and made a board for telemetry and other data to be sent back to my ground station. It is based around the Seeed Studio XIAO ESP32-S3 Sense, as it's really cheap and makes it easy to integrate a camera Images will be...

Does wood attenuate radio waves? If so is there a formula for calculating the amount of attenuation of radio waves will experience when passing through a piece of wood at a givern thickness?

Hi all, I’m working on a small FM transmitter project using a Raspberry Pi 3 and the fm_transmitter library by markondej (GitHub link: https://github.com/markondej/fm_transmitter). It uses a GPIO pin to output a square wave FM signal directly. The output is around 3.3V and can only safely...

Hi everyone, I’m facing issues with my nRF52 BLE design due to a solder mask thickness change and grounding approach. I’d appreciate expert guidance on retuning the Pi filter, recalculating impedance, and resolving grounding concerns. Issues Faced: Solder Mask Thickness Change: Ref NRF52 DK...

I have used my small loop antenna (which has a main loop and a coupling loop that can be tuned using a variable capacitor) with an AM radio receiver to receive MW broadcasts. However, the small loop antenna which was made by me was not working properly but when I connected a ferrite rod loop...

Hi! I am a newbie in R/C industry. Currently I am building custom rc controller along with rc car using flysky, specifically FS RM003 and FS-ia6b. Controller will be programmed using Arduino. There are lots of issues like: can those modules work with each other for rc car. If yes, how to bind...

Hello everyone, heres an quick overview of what the design does: the Si4703 radio tuner receives signals from the FM frequency band. Those signals will then get amplified by the PAM8008 module to output audio from the speakers. The current board stackup is sig/gnd/gnd/sig. Some additional...

I'm making a dog health and activity monitor with 2 Micro:Bits. I found out that the radio range is only 70 metres, and I need to make it about 5-6 KM. I was wondering whether I could connect a loop antenna to the Micro:Bit. If so, how would I do that? Could I use an amplifier of some sort? I'll...

Hello everyone, I had recently purchased a Technics SA-5360 Stereo amp tuner from eBay. This was after a long break since 2019 I took from my vintage electronics hobby. I used to mainly collect and restore tube based tuners and amps, but recently it has become quite expensive I noticed...

I'm planning to buy a spectrum analyzer (Signal Hound) or may be some different like Rigol/Siglent. I want to know if my understanding are correct, like how its going to help me. I mostly work on 433Mhz, 915Mhz and 2.4Ghz frequncy based modules, while development I'm not sure if radio was...

hey guys i,m new to this forum and Lt spice I am planning on building a FM bug using hardware, i am trying to simulate this circuit using LTspice In simulation i am replacing the microphone with a voltage source of 10mV and 2kHz then removing 68k resistor. simulation file is attched.Kindly...

Help! I have been pulling my hair out trying to find the root cause of this inference. any Avionics techs in this forum? This system is 24vdc Aircraft radio The Situation I currently have two resistive based instruments that deflect when radio is keyed. I have determined RFI is coming from...

So I purchased this : (HanRongDa HDR-831) HanRongDa HDR-831 It's working great but the practical range is about 15 meters. I'm looking to upgrade this. The thing is, I know very little about radio frequencies and antennas. Can something like this work ? Ebay Amplifier The device I purchased...

My attempt: One thing that confuses is that alfa3 is negative even though in my computations i should get a positive value, can you guys check if i did everything right? My attempt: Here i have the same problem as before, the alfa3 is negative. Can you guys check this one also?

I've built an AM tube transmitter. I don't have much experience in electronics. Can you please verify this circuit and tell me if it would work or how can I improve its performance? It uses an Armstrong oscillator to make the carrier frequency.

Hi, I have a project that i would like to complete. i need to activate an LED light outdoors, whenever a designated vehicle comes within 200-300metres of the LED light. i was thinking of using a simple 12v FM radio transmitter on the vehicle. the LED would have an FM radio reciever tuned to...

If you build a long range wireless energy transfer device, why can't you use a lower frequency than the microwave range to transfer energy? Why does it have to be microwaves? Why not say 10 megahertz?

Hi all, I have a 807 vacuum tube and I want to make a CW RF amplifier with it. I am thinking of using transistors in pre amplifier and 807 as final power amp. I have only one tube so I cannot make push pull amp. First of all I need to know if it will be possible to make such RF amplifier. If...

First of all, i want to listen in my house, you can forget a car. It has been in the warehouse for a long time. Yesterday i tried it. Although I haven't connected an antenna yet, it still works. Because of it has 10-12 cm antenna plug cable probably. As it stands, FM is listened almost...