Ken, Tnx for the info. I received a couple replies to this and I learned something new today. Mine are just GFI's. Tony Tony: We are not talking about GFCIs (Ground Fault Circuit Interruptors). We ar
Matt Yes, cheap unfiltered wall warts can act as mixersAnd produce mix products depending on their Switching frequencies Multiple turns 6 or more on the input and output type of the wall warts with
MattThe rectifier in these unfiltered wall warts makeExcellent doublers as well as producing the Products based and their switching frequenciesMikeWB6DJI Matt Yes, cheap unfiltered wall warts can ac
to: Matt NQ6N Maybe a better test to check PA functionality which includes bias and that bothpush-pull devices are serviceable (rather than what amounts to a "design verification test" measuring noi
re: "What is best practice to keep RF out of audio and Mic lines? 160 through 10 meters." Joe, IN a nutshell (and for starters): a) stay out of the near field of the antenna. b) operate into a 'balan
Author: "EDWARDS, EDDIE J via RFI" <rfi@contesting.com>
Date: Wed, 4 Mar 2020 19:25:28 +0000
--Original Message-- From: RFI On Behalf Of Gary K9GS Snow is not an issue with LED streetlights since they do dissipate quite a bit of heat as David pointed out. Snow, however, is an issue with LED
The problem with ROHS is it seems to be one factor that fosters growth of tin whiskers and dendrites. Lead in solder prevented that. NASA produced a good resource paper on the subject titled Basic
Author: David Klinect via RFI <rfi@contesting.com>
Date: Mon, 23 Mar 2020 19:13:23 +0000
I have searched and found this question asked several places, but have not seen a real definitive answer.............what is a good inverter to buy to put in a vehicle that produces almost no measura
Author: David Klinect via RFI <rfi@contesting.com>
Date: Mon, 23 Mar 2020 19:44:23 +0000
Yes, good questions. Looking in the range of 1,000 watts and, yes, 12 VDC to 120 VAC (60 Hz). Thanks, Dave KA8MHW This is an EXTERNAL email. STOP. THINK before you CLICK links or OPEN attachments. If
Author: David Klinect via RFI <rfi@contesting.com>
Date: Tue, 24 Mar 2020 11:33:02 +0000
Thanks, Jim. Not looking at any specific ham band..............would prefer that It be EMI-Free on all (or as much as possible) of the HF range. Always appreciate your insights into these matters....
Author: David Klinect via RFI <rfi@contesting.com>
Date: Tue, 24 Mar 2020 17:13:27 +0000
Thank you! Will add that to my list of ones to learn more aboutI suspect they make similar ones with higher power ratings. Dave KA8MHW I know you're looking for a 1 kW unit, but I have the following
Author: David Klinect via RFI <rfi@contesting.com>
Date: Tue, 24 Mar 2020 20:18:28 +0000
Thank you, Don............more good ideas to investigate! Dave KA8MHW This is an EXTERNAL email. STOP. THINK before you CLICK links or OPEN attachments. If suspicious please click the 'Report to Inci
On the Ofcom website there is a picture of the spectrum analyzer and an expanded image of the bulb (240V 60W) if one choose to open the picture in a new browser tab. https://www.ofcom.org.uk/about-of
Author: David Klinect via RFI <rfi@contesting.com>
Date: Wed, 1 Apr 2020 13:23:20 +0000
Getting back to my "EMI from inverters" question, I was able to lay my hands on two Sensata Technologies Dimensions units (a 1200 watt and a 3000 watt) and, with both units, the only EMI radiating fr
One may, if interested, check the OFCOM website link I posted earlier and note that picture posted is indeed an incandescent bulb. I still have questions related to how the device produced EMI in the
No wonder OFCOM had no further info or speculation; They were dumbfounded by the phenom. Maybe this is why (in part) modern bulbs above 25W have been Argon filled (as well as using a compact, coiled
Stimulus generalization; the LED types aren't the ones (bulbs) that gave OFCOM the problem. You're going to be figuratively shocked when you finally realize its really a tungsten filament lamp (with
The answer, Lloyd, appears to be definitively "no". I think the phenom had the OFCOM boys stumped. The link by Ed Hare lead to more links that shed light on the physics (but, you will have to get you
Fortunately, those are not the lamp style the German researchers found troublesome. An up and down filament does not compare to the many up and down filament of the bulbs that interfered. Also, a key
re: "I went out today to track down a noise source, which on the HF bands appears to be coming from the east. " Scott, I give you even money odds that you found ANOTHER noise source on VHF, and not t