Questions tagged [ferrite]
The ferrite tag has no summary.
41 questions
2 votes
1 answer
81 views
Clearest way to measure ferrite choke effectiveness?
I have some snap-on ferrite chokes that are supposed to cut down on EMI, and I was wondering if there was any relatively direct way to measure — on the bench — whether they are effective or not. Is ...
- 7,567
3 votes
2 answers
228 views
3 ferrite rod antennas in close proximity
I want to control a trio of radio controlled clocks. DCF77 (77.5kHz), JJY (40kHz), and WWVB (60kHz). Suitable signals can be generated with a microcontroller or Raspberry Pi. I will use ferrite rod ...
- 159
6 votes
2 answers
379 views
Will 2 ferrite beads taped side by side perform the same as a single-piece binocular core?
I intend to make a beverage antenna and have quite a few spare ferrite beads of various mixes. If you look up binocular core ferrite on amazon you will see they are a single chunk piece of ferrite ...
- 61
6 votes
2 answers
1k views
Why do 9:1 ununs use type 2 material for the core?
I do not understand how a 9:1 unun wound on a T200-2 works. I understand the transformer voltage and current ratios. I have wound several toroid chokes and 49:1 ununs and know how they work. What is ...
user23405
2 votes
0 answers
106 views
trying to get a passive AM bar antenna to work
I pulled a nice big external AM ferrite bar antenna off a working stereo. 5.5" long. it has 4 wires coming off of it. red must be the main wire, because checking that with an LCR meter connected ...
- 31
2 votes
1 answer
904 views
What are these extra wires coming out of my ferrite rod antenna
From my understanding a ferrite rod antenna is simply a length of wire wrapped around a ferrite rod. A wire will sticks out of each side of the rod, one is ground and one is the main receiver. I ...
- 311
4 votes
1 answer
1k views
60kHz WWVB receiver help
I have built a large ferrite loopstick antenna based off this video. I live in Washington state and am trying to receive and decode WWVB. I can get my antenna to resonate at 60kHz with ~700 pF of ...
- 41
6 votes
4 answers
597 views
How to achieve highest Q-factor in inductors for 6-160m amateur bands?
When building filters for ham bands (direct sampling SDR frontend) - it is common to build filters using 2,6,10,12 material toroids. Are there any recent developments that offer lower losses / higher-...
0 votes
1 answer
171 views
Ferrites losses calculation
I am new on RF design. I would like to know more about ferrites. I am looking for information about how to calculate ferrite losses and saturation points for a given application. I also would like to ...
- 101
3 votes
1 answer
577 views
Using PVC coated solid-core wire for a small number of turns on toroid
I'm researching making my own 49:1 unun using an appropriate mix ferrite toroid and some reasonable gauge solid-core wire. (This is for an experimental HF end-fed antenna, though this detail probably ...
user21417
2 votes
1 answer
3k views
Core mix preferences for a balun (or unun) vs a choke
Was watching a YouTube video a little while ago and an engineer from Palomar engineers mentioned that using Mix #31 cores for balun construction wasn't ideal. He went on to mention that Mix 31 (or 43 ...
- 697
3 votes
1 answer
220 views
Ferrite choice for fan dipole
I am intending to build a two element fan dipole for 80 and 20m. How should I go about choosing a ferrite toroid and number of windings for the balun, to operate effectively over such a range of ...
- 255
1 vote
3 answers
268 views
Can ferrite rod antenna be made out of the choke?
I'm reading the instructions on preparing the ferrite rod antenna. If I understand it correctly it is matter of building an LC circuit. My question is: Can the ferrite rod antenna be built using a ...
- 111
5 votes
1 answer
1k views
How to meassure a ferrite using a VNA?
I want to measure a ferrite toroid using a VNA. I would like to classify it for a whole range of frequencies but if it's too complicated I'm OK to just pick one frequency. I have 3 questions actually: ...
- 391
3 votes
3 answers
1k views
Is this true about ferrite loop antennas?
There is an article on wikipedia about loop antennas. It shows like an AM radio's antenna with the ferrite rod and says this: This greater conductance channels thousands of times more magnetic power ...
- 454