re: " What happened to RF chokes and bypass capacitors, which when the correct component values and specifications are used (value, current handling and voltage rating), will work better and cost muc
Don, The 64,000 dollar question: After adding the preamp, what is the 'effective' sensitivity compared to station receiver? For instance, using the Coastal Navigator DF receivers (that exhibit a very
Last night I noted a drifting birdie sweeping up and down the 160 meter band. To make a long story short, I recently installed one of these to archive some VHS tapes: https://www.amazon.com/HDML-Clo
FB Don. The Coastal Navigator is late 1960's tech, using Germanium transistors and the 'usual' tuned ferrite loopstick (characteristic for gear of that vintage) in conjunction with a telescopic whip
Great demo, Don. Pattern looks like what I get with the Coastal Navigator. Having the ability on-the-fly to determine the unique direction is a godsend, as you have no doubt experienced in your DFing
kd4e For my purposes, I need it demodulated with an "envelope detector", this means in AM mode. SSB is too narrow to really do noise sources justice. Thanks. 73 de AA5CT Jim . . On Thursday, February
kd4e, To my trained ear that sounds like a power line arc. Also, given your description of how broad-banded it is. Also, noise blankers in most rigs work on low rep-rate, narrow impulse noise (like a
In the "olde days", Jim, we would tune across the band and note any similar buzzes at xx kHz apart IF indeed we could find any more 'buzzes'. With powerline arcs, the spectra is continuous, there ar
Dave, When one only really need *one number* (the spacing between the carriers that one is observing ) we've actually taken a bit of a step back. The question to be asked when observing un-ID'd spect
Don, What is the distance between station antenna and the offending noise maker? Google maps has a quick, handy distance measuring tool once in the map, using the satellite view even. I have a noise
re: "I need to move to the country, with a hill between me and all cities, or ..." Or, look at what Horizontal Waller Flag can do. N4IS Jose Carlos has a good YT video on what the transmit antenna, t
Don, A decade or more back I built a 10m dipole for use up on the roof to find a noise in the neighborhood. Maybe it was two decades back! And it worked well for getting a bearing to go out searching
Sure thing, Mac. BTW, I had to view this several times to get full impact of what Jose was saying and showing, but, it is a good showing of what the Horz Waller Flag can do to (manmade power line) no
Mac, Here is a presentation they put together awhile back: https://www.kkn.net/dayton2011/N4ISWallerFlag.pdf Particular attention has to be paid to the xmission line used between the two 'flags' and
Radio built-in to the wall; sniff for the LO to find it ... 73, de AA5CT Jim . . Any RFI sleuths in the Lockport IL area? Interesting problem... Lockport family says mysterious voices, music come fr
Author: "EDWARDS, EDDIE J via RFI" <rfi@contesting.com>
Date: Mon, 24 Feb 2020 14:26:58 +0000
An electrician friend of mine told me the ARC-fault breakers are now required in National Electric Code 2020. He said it's a disaster for the customers and a big money maker for the electricians. It'
When I (personally) redid my kitchen three years ago I installed two new circuits that have AFCI breakers. I have had no issues with them tripping. I operate HF, CW and run about 200 watts. TomW3TA A
Isn't the main purpose to prevent getting shocked, particularly where there is a potential for a wet area? I have had GFI outlets and breakers for years and never a problem with tripping, when they w
Scott, Thanks. I did not know there was a difference Tony Ordinary ground fault interrupters do that. Some of them are sensitive to RF, too. Arc fault interrupters, in addition, are supposed to detec