[aprssig] Fwd: The end of daytime HF?

Ev Tupis w2ev at yahoo.com
Fri May 4 06:21:39 EDT 2018

 A right is a right only when exercised. If someone hits your car and you leave the financial outcome up to an insurance company, then you will get a settlement that is in the best interests of the insurance company.  If you choose to involve your own lawyer, you get action that is tailored to your best interests.

The same holds true for Part 15.  As a licensed operator...if you choose to put up with interference then you have given away your power to the FCC "enforcement department".  If you choose to rely on the FCC, they will act in their best interests as defined by the political climate of the moment.

What's left?

(1) Personally sue manufacturers and installers.  Imagine the impact of tens-of-thousands of lawsuits (which is all we can do...imagine...because #2 is a more realistic outcome).

(2) Take the "old man on the porch" approach and simply complain to anyone who will listen.  We will feel better by telling others that we are in-the-right and by thinking someone will take up our cause ... until people stop listening and make fun of us.

(2a) Adopt operating modes that are (or will be) designed to be used in a noisy environment; or start complaining about them, too. Lol.

Ev, W2EV

    On Thursday, May 3, 2018, 10:22:19 PM EDT, Robert Bruninga <bruninga at usna.edu> wrote:  
 I don't want to be an alarmist, but we need the Hams with the proper knowledge to get involved in this disturbing news.

The National Electric Code now requires electronics on every module of a solar array communicating  via signalling on the DC power lines to assure EACH pair of panels can shut down independently.  This is to make all possible faults never allow more than 80 volts anywhere in the system.  This is effective 1 Jan 2019

This is the nail in the coffin of simple DC series string arrays which are the quietest systems and almost demands microinverters or optimizers on every panel.  Refer to the QST article a few years ago about how disastrous optimizers are to RFI and HF operations with modules all over the roof..

Here is the Solar news:
https://solarbuildermag.com/ bos/nec-2017-module-level- solar-system-shutdown/

Also, what is going to happen to an array that has signaling all over it in the near field of HF?

Although you can avoid it by going solar before then, you may have problems when your neighbors go later.

I hate  to be an alarmist but we all know what happens when ham radio and commercial systems are incompatible and even though Ham radio might be in the right, we are only 1 in 600 and no one is going to side with us.

We took on broadband over power and squelched that dumb idea, but now this has the potential for equal demise of Ham radio.  It should be fixable, but we also know that there is high competition in the solar market and the modules that are made the cheapest  will be popular and will likely not be adequately filtered.

Sorry for posting to the APRS group but it is the only HAM email reflector I subscribe to besides AMSAT..

If nothing else, we need to find out what systems are terrible emitters and nip them in the bud.  Maybe all it takes is driving by solar systems you see and turing on your AM radio on a weak signal channel and seeing if the background noise peaks near that home.  But also it has individual peaks, so it might also be nice to tune around too find the max and then check the range.  I find the noise can go hundreds of feet along the power lines....

You cant miss  em... just sounds like a 60 Hz buzz on all the harmonics of the inverter switching frequency.


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