FCC’s Noise Floor ‘Study’?




It seems like the FCC's recent interest in doing an in depth study of the growing RF spectrum noise floor has taken a new twist.



The FCC's apparent lack of real action in gathering the data needed to make serious inroads into RF noise pollution has drawn the attention of the ARRL, which voiced their concerns in a recent ARRL Letter as well as in their formal response to the FCC.

In response to the FCC's Public Notice (ET Docket No. 17-340) Spectrum Management proposals.

The ARRL "took the opportunity to strongly urge the FCC to reinstate a 2016 TAC noise floor study, which, ARRL asserted, apparently was terminated before it even got started." It would seem that the proposed in-depth study never even happened and the term 'noise' has morphed into an 'interference' issue!

The FCC's paper proposed a number of guiding 'principles' in going forward with spectrum management policies, loosely based on the concept that more emphasis on eliminating 'interference' should be placed on receivers along with continued development of transmitter spectral purity and that with increased spectrum crowding, users will simply have to expect and accept certain, as yet unspecified, levels of interference!

It sounds suspiciously as if the FCC has decided that the source of any noise / interference problems have become too large to control and have passed the buck to equipment manufacturers in order to solve the growing problem for users!

“Indeed, it is difficult to imagine how the Commission can now…suggest the adoption of specific spectrum management principles, incorporating such concepts as receiver immunity, HCTs [harm claim thresholds], and interference temperature determinations without having…a firm grasp on ambient noise levels in basic RF environments and geographical areas,” the League told the FCC.

In their series of guiding principles relating to 'interference realities', the FCC has issued a number of broad, somewhat ambiguous statements, that might be interpreted in any number of odd ways ...

"Principle #1 -- Harmful interference is affected by the characteristics of both a transmitting service and a nearby receiving service in frequency, space or time;

Principle #2 – All [radio] services should plan for non-harmful interference from signals that are nearby in frequency, space or time, both now and for any changes that occur in the future;

Principle #3 – Even under ideal conditions, the electromagnetic environment is unpredictable. Operators should expect and plan for occasional service degradation or interruption. The Commission should not base its rules on exceptional events;

Principle #4 – Receivers are responsible for mitigating interference outside their assigned channels;

Principle #5 – Systems are expected to use techniques at all layers of the stack to mitigate degradation from interference;

Principle #6 – Transmitters are responsible for minimizing the amount of their transmitted energy that appears outside their assigned frequencies and licensed areas;

Principle #7 – Services under FCC jurisdiction are expected to disclose the relevant standards, guidelines and operating characteristics of their systems to the Commission if they expect protection from harmful interference;"

The ARRL response argued that:

“Requiring better performance from receivers or RF-susceptible devices is a valid, reasonable, and long overdue requirement,” ARRL said, “but the major goal of doing so should be to prevent instances of interference ..."

Specifically they argue that amateurs are unique users and able to recognize harmful interference beyond their control and should not be subjected to the same restrictions (ie. get ready to accept new levels of yet undefined interference levels) as commercial users.

"ARRL argued, however, that the Amateur Service should not be subject to receiver immunity standards, because licensees employ a wide range of propagation, emissions, bandwidths, power levels, receivers, and antennas, making any receiver performance standards arbitrary and compromising the Service’s experimental nature. They also are able to differentiate between interference from nearby spurious or out-of-band signals and that caused by receiver deficiencies. The HCT concept does not fit the Amateur Service particularly well, either, the League said; any interference hams suffer from each other is resolved cooperatively. Brute-force overload also occurs occasionally but is resolved by licensees without FCC intervention."

The ARRL seems somewhat forgetful when it comes to several long-standing complaints of inappropriate amateur-generated interference and bad behaviours which have been ignored for far too long ... problems well beyond 'cooperative resolution' by affected amateurs.

Although the ARRL does agree with many of the FCC's proposals, they doggedly insist that the FCC's apparent quashing of their original noise data investigations is critical to going forward:

“That, in ARRL’s view, is a big mistake,” the League contended. “No system of spectrum management incorporating [harm claim thresholds] and receiver immunity levels can be accurately implemented” without the noise study data.

“That study is more important now than ever before,” ARRL concluded, “and it is increasingly urgent as a prerequisite for any new spectrum management policies.”

With Washington's drastic cutbacks in FCC field-office investigators and overall budget trimming, it seems that the FCC is still relentlessly driven to eradicate all forms of illegal (pirate) broadcasting. It's a pity that they don't display the same zeal for dealing with the illegal imports and distribution of the offshore equipment that is quickly killing our ability to hear anything on the ham bands ... without selling-off and moving to several acres in the country.
Steve McDonald, VE7SL, is a regular contributor to AmateurRadio.com and writes from British Columbia, Canada. Contact him at [email protected].

4 Responses to “FCC’s Noise Floor ‘Study’?”

  • Ed K7HFU:

    I see the FCC’s answer as this:

    If your neighbor is throwing a wild party at 0200hrs then it is your problem and it is your responsibility to put in ear plugs.

    The pirate radio stations are an easy target, something the FCC can work on with little effort and claim high profile success. Even though the stations bother very few people and actually have a substantial following in some areas.

    The FCC has no desire to pursue the real problem until it affects the Big Boys.

  • Goody K3NG:

    Pirate radio station enforcement is a top priority with the FCC currently because it supports the “law and order” sentiment within the federal government right now. It gives the appearance of a no-nonsense agency getting things done. It’s an uncomplicated issue that obtuse voters can understand, unlike complex issues like Net Neutrality or the radio frequency noise floor. If we want any example of how the FCC will deal with this, we only have to look to the recent past with BPL. There were some blatant abuses of the process and outright denial of technical information and science, which the FCC never acknowledged or resolved. We were just lucky that market forces took out BPL.

  • ve7sl Steve:

    Spot-on comments and Ed, your analogy is perfect. The FCC nor Canada’s equivalent has no interest in amateur radio for a number of reasons but thankfully ours is not being driven by political motives. The FCC’s obsession with pirates is really weird.

  • Greg VE3FAX:

    The FCC are seemingly making it the receivers/listeners problem when we all know it is the Plasma TVs , switch mode power supplies, illegally imported junk. The idea that they still prefer not to control the devices that are spewing ditigal hash that has effectively rendered the ENTIRE RF spectrum
    almost useless, tells us they have no desire to curtail the problem.
    It’s not just Hams but AM broadcast stations that are also losing listeners due to high noise levels. Rather than address the cause, they simply move to FM or apply for higher power- they know its a lost battle.

    The end game is simple- make the spectrum useless for public “free” use, and sell it off for controlled, encryptied “pay to listen” services.

    With the now blatant censoring and removal of “conservative oriented” groups from social networks, and in Canada, the half a billion dollar slush fund recently provide for “private news agencies” who agree to “co-operate favourably” with the Leftist Liberal Truedau government, the idea of having acess to freely communicate any “unapproved” ideas or information is coming to an end.

    “Social Complaince Scores” for all your communication behaviour IS Coming to the New Socialist West.
    I will let you read about what “social credit scores” in communist China does to those who have “offensive” ideas or thoughts….and it was designed by Google!

    So you think the FCC really cares about a low noise radio spectrum for Hams, SWLs or “pirate” broadcasters? The sooner the spectrum is deemed useless for public use, it will be sold, digitized and encrypted- end of story.
    Check back in 15 years and see if you can call me a “conspiracy nut”,
    – if your allowed.

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