Welcome
Username or Email:

Password:


Missing Code




[ ]
[ ]
Online
  • Guests: 23
  • Members: 0
  • Newest Member: omjtest
  • Most ever online: 396
    Guests: 396, Members: 0 on 12 Jan : 12:51
Members Birthdays:
One birthday today, congrats!
uzzors2k (35)


Next birthdays
03/29 GrantX (34)
03/30 Adam Horden (39)
03/30 Mr.Warwickshire (23)
Contact
If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.


Special Thanks To:
  • Aaron Holmes
  • Aaron Wheeler
  • Adam Horden
  • Alan Scrimgeour
  • Andre
  • Andrew Haynes
  • Anonymous000
  • asabase
  • Austin Weil
  • barney
  • Barry
  • Bert Hickman
  • Bill Kukowski
  • Blitzorn
  • Brandon Paradelas
  • Bruce Bowling
  • BubeeMike
  • Byong Park
  • Cesiumsponge
  • Chris F.
  • Chris Hooper
  • Corey Worthington
  • Derek Woodroffe
  • Dalus
  • Dan Strother
  • Daniel Davis
  • Daniel Uhrenholt
  • datasheetarchive
  • Dave Billington
  • Dave Marshall
  • David F.
  • Dennis Rogers
  • drelectrix
  • Dr. John Gudenas
  • Dr. Spark
  • E.TexasTesla
  • eastvoltresearch
  • Eirik Taylor
  • Erik Dyakov
  • Erlend^SE
  • Finn Hammer
  • Firebug24k
  • GalliumMan
  • Gary Peterson
  • George Slade
  • GhostNull
  • Gordon Mcknight
  • Graham Armitage
  • Grant
  • GreySoul
  • Henry H
  • IamSmooth
  • In memory of Leo Powning
  • Jacob Cash
  • James Howells
  • James Pawson
  • Jeff Greenfield
  • Jeff Thomas
  • Jesse Frost
  • Jim Mitchell
  • jlr134
  • Joe Mastroianni
  • John Forcina
  • John Oberg
  • John Willcutt
  • Jon Newcomb
  • klugesmith
  • Leslie Wright
  • Lutz Hoffman
  • Mads Barnkob
  • Martin King
  • Mats Karlsson
  • Matt Gibson
  • Matthew Guidry
  • mbd
  • Michael D'Angelo
  • Mikkel
  • mileswaldron
  • mister_rf
  • Neil Foster
  • Nick de Smith
  • Nick Soroka
  • nicklenorp
  • Nik
  • Norman Stanley
  • Patrick Coleman
  • Paul Brodie
  • Paul Jordan
  • Paul Montgomery
  • Ped
  • Peter Krogen
  • Peter Terren
  • PhilGood
  • Richard Feldman
  • Robert Bush
  • Royce Bailey
  • Scott Fusare
  • Scott Newman
  • smiffy
  • Stella
  • Steven Busic
  • Steve Conner
  • Steve Jones
  • Steve Ward
  • Sulaiman
  • Thomas Coyle
  • Thomas A. Wallace
  • Thomas W
  • Timo
  • Torch
  • Ulf Jonsson
  • vasil
  • Vaxian
  • vladi mazzilli
  • wastehl
  • Weston
  • William Kim
  • William N.
  • William Stehl
  • Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Forums
4hv.org :: Forums :: Electromagnetic Radiation
« Previous topic | Next topic »   

Signal Piggybacking

Move Thread LAN_403
ElectroMichel
Thu Jan 05 2017, 11:59AM
ElectroMichel Registered Member #61402 Joined: Mon Jan 02 2017, 05:13PM
Location:
Posts: 6
If metal is irradiated simultaneously with a high frequency ( 600 Hz) signal, and an ELF (0.5-100 Hz) signal, when will the ELF signal piggyback on the 600 Hz signal, and when wont it.
(meaning when will each signal affect the metals permeability separately and when will they effect together. the metals permeability is frequency dependent)
Back to top
Dr. Slack
Thu Jan 05 2017, 03:26PM
Dr. Slack Registered Member #72 Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
I suspect you're talking about Intermodulation Distortion.

Any incident magnetic field will cause a field in the material. High frequency fields will be attenuated by currents induced in the top layer of the material, the skin depth effect. As the frequency drops, the field penetrates further.

For low values of the field, the permeability will be constant, the B field in the material will vary linearly with the incident H field. For incident signals with two frequencies, the fields will vary with both, and for small signals, the response will be linear, and the effective permeability still constant. Even with two signals, neither will be 'affecting' the permeability.

With stronger signals, the magnetic response can become non-linear, and then you can regard the permeability as being altered, and effectively by whichever signal is stronger.

Look up 'passive intermodulation', a big problem in multi-band cellular antennae working at high power. The main problem is usually electrical, for instance partial contact between metals due to loose bolts or contaminated connectors, but ferrous components can also contribute. They tend not to be used intentionally, but a nearby steel fence can often be irradiated by the cell antenna and cause problems.
Back to top
Sulaiman
Thu Jan 05 2017, 05:27PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Magnetic Amplifier Link2
I imagine the elf signal driving the core, modulating the 600 Hz signal.
Back to top

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob

Go to:

Powered by e107 Forum System
 
Legal Information
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.