Don't power Thyristors fire only at the mains period and also have a needed, adequate, low bandwidth [relative to 1 - 40MHz]? Also transformed supplies at the local level don't use power regulation to alter phase loading , at least not here,afaik. I can see load controllers having some nearby effect, but they don't seem natural candidates for Hum, in themselves, in the wider picture. Easy to pick up LF power leakages and these have caused some identified Hum over the years, along with loose transformer windings/laminations. Switching power supplies fall into the local category, and they also could contribute to hum via load imbalances as they cause reactive loads at night. These technologies are not new and been on my suspect list for years, but they are variable in their loading- and hum is very constant in my area.
On Dec 9, 3:00 pm, Vic <[email protected]> wrote: > Trev - It all comes down to a piece of electronics called a Thyristor > - In the case of the Hum, a Power Thyristor. As more electronics are > mounted on the poles drawing their power from the lines, more and more > thyristors are in operation as electronic equipment requires DC power. > Hence, the Hum phenomena is becoming more and more widespread. > > It really comes down to incompetence on the part of the electricity > utilities and mega-salesmanship on the part of vendors of this stuff. > > There are safe alternatives, there are cheaper alternatives. There are > also alternatives that are far more technologically stable and that > are upgradeable as technology advances without the need for additional > equipment. The equipment that has been installed and is being > installed right now results in communications speeds over the power > lines that are 8 years out-of-date and cannot give any additional > speed witohut being ripped out and replaced. > -- You received this message because you are subscribed to the Google Groups "Hum Sufferers" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/hum-sufferers?hl=en.
