One thing I noticed when driving around with a PC+ USB spectrum analyzer to find a new QTH, was how much quieter neighborhoods with in ground utilities were from those with the old "poles and pigs" d
I think there are two issues: Is the core material (ferrite grade) the right choice for the job? Most commodity clamp ons sold at flea markets and on ebay aren't specified so may or may not provide t
An option is to not use MPPT panels which have the power delivery optimized at each panel with an RFI generator. I had two Sunpower installations (7.5kw & 10kw) on 3 inverters that did the MPPT optim
I'm not an attorney but have to wonder if class action litigation isn't a path for hams against known RFI. Especially when the FCC has noticed a company cited in an earlier post, which removes the ne
I agree a split system is the way to go, more $ but a lot more efficiency so if it runs a lot the payback is there. Plus they are super quiet inside and out with the compressor outside, which could b
I have found the "Battery Minder" products quiet and reliable. Not to be confused with Battery Tender which have had a high failure rate for me. The Minder brand uses a pulse charge float technology
Shouldn't cars be required by the FCC to conform to Class A or B limits? After all, they are a large collection of computers with some wheels attached. Something ARRL ought to pursue. It's not rock
A long list of ideas: On my amp 240AC I used a commercial line filter plus a multi turn green wire going thru a 240-31 core to keep rf out of the AC power grounds. (I assume the amp has it's separat
I've replaced over 120 lamps with the FEIT brand from Costco. Various fixtures. All worked. Only one has failed in last 8 months. No RFI. Usually there has been a power company rebate but haven't
Here is one to absolutely avoid - Philmore MW122A - 3 - 12 VDC 2 Amp Regulated Power Supply the load was 900ma and the case melted. AC switch also, couldn't it turn off. Headed for flames when caught
No data on Firman, but did do a teardown of the Harbor Freight Predator 3500 invertor unit and measured its electrical performance. It does meet specs and has some headroom on the DC side of the inve
Various pulse trains come and go on 80m. One has a PRF of exactly 50Hz, almost certainly OTHR. Another seems to have a lower rate, maybe 120Hz, I haven't measured it exactly. Today I had a multi tone
Another coax choice for 75 ohms is RG179, TFE + SCCS conductor + silver shield. Slightly less diameter than RG400. I've not had SCCS creep problems in dozens of QRO chokes I've made with 50 ohm SCCS
The "LEDS on a tape" are a good choice. A resistor and LED every couple of inches, cut off what you need with scissors. Sticky tape on the back. ebay & amazon. cheap. Grant KZ1W Looking for recommend
I think your bend radius number should be 30mm (1.18") one time per Hubner & Suhner not 0.175". About the same as RG142 50 ohm. Grant KZ1W On 2/19/2019 15:21 PM, John K9UWA wrote: What if the outside
This article is way above my pay grade, but does show that Si panels create RF noise. How much above the top frequency limit of 100Khz shown in the chart may or may not be a problem. However, put eno
The smaller #31 cores (1-1/8L x 1-1/8" dia Fair-Rite 2631101902) and 1/8" RG316 TFE coax can make a choke, but not the R of a 240 size. About 4k ohms 160, 6.5k 80m, 4k 40m with 10 turns (max that fit
My go to maintainer is by Battery Minder (NOT Battery Tender). I have 5x running 24/7 - two 24v units on a 48v 220A-H boom lift, 1x on shack backup 12v 220A-H, 1x 12v on a dump trailer 120A-H and 1x
A bit of experience re "solar is not a good investment". It depends on the price per KWH. When living in the Bay Area circa 2005, and a victim of PG&E and the Sacramento Bozos, peak rate could exceed
A couple of comments: I just bought ($25) a Marine DF, with BFO, 3 bands 0.15 to 5MHz, & VHF FM, has D battery as well as 12v. Optical sights, S meter, sense antenna as well! Pretty good RFI DF I thi