As I mentioned in a post a few days ago, I am at the very beginning of being able to operate on 160 and 80Ms. (To date, I have only operated on 10, 15 and 20M.) I have been doing a lot of reading, pr
My rig (FT-dx5000) is located on a desk. Immediately under the desk is my computer, and just above the rig is a shelf on which sits 2 flat-screen monitors. One of the points made in Low-Band DXing is
You can build many excellent line filters for the cost of one of anything from DXE, etc. I build mine into the older style USA made outlet strips using standard ferrite rods, and AC rated disc caps w
The W7NQN line filter is a differential-mode filter. You need a filter that is designed for common-mode filtering. _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw?
This is from the web page advertisement: -- Compare this with a Brand "C" filter which only handles common-mode interference problems. The NQN AC power-line filters are optimized for common-mode and
Dear Topbanders, I use an ICE Model 475-3 AC Line filter in the shack. It provides inductive isolation, overvoltage control, capacitive decoupling and interference control of both common mode and dif
White papers: http://docs.commscope.com/Public/Coax101.pdf Although the test frequency and method is not described, this shows the difference between Quad shield and single foil and braid is 7 dB bef
I don't like diff mode only filters because they have diff mode to common mode conversion due to component tolerance. I don't see a fuse in the NQN filter and it us rated for only 7 amps. To be used
I'd take that question to the seller for an explanation. The filter may be intended to quiet a particular noisy device, like a PC. It only needs to be rated for the current drawn if it's on the custo
Differential mode filtering goes inside the outlet strip and ferrites on the outside take care of common mode on my filters. Ferrites can be externally added to any DM only filter. Carl KM1H ________
Hi guys Let me share what I've done about reducing noise in the Shack, not all station has this kind of configuration, you may not need it. 1- Tom is 100% right about common mode noise. I killed all
While this does exist at frequencies below where skin depth in shields occurs, the "magnetic field thing" is a very common myth, or misconception, with radio frequency signals. A monitor with low fr
Hi Jose, You had no problem hearing my 5W signal in the "Summer Stew" and you were the farthest contact made during my limited operating time. Some loud signals could not hear me at all so I figured
This report on RFI mitigation may be of interest to folks here: http://edocs.nps.edu/npspubs/scholarly/TR/2007/NPS-EC-07-002.pdf. It was done at the Naval Post Graduate School and almost appears to h
Thanks for the link, John. This is an excellent study that should be read by anyone plagued by noise. Not a single mention of a clamp on ferrite ring however, as this study has to do mainly with powe
John, is the companion document on reducing noise internally at a site also available? (It's mentioned in the document) Thanks, Bob Poverty is the worst form of violence Mohandas Gandhi _____________