AmateurRadio.com

Continuing with the important sections of NPRM (FCC 15-50) affecting the future of LF/MF assignments in the U.S.A. ...








174.
We also seek comment on the applicability of IEEE 1613-2009 – IEEE Standard Environmental and Testing Requirements for Communications Networking Devices Installed in Electric Power Substations ... ARRL claims that PLC systems complying with IEEE-1613 “would virtually guarantee that there would be no interaction between amateur stations and PLC systems,” and that compliance with the standard has been required by the Commission’s since 2002.  As background, the Commission’s rules require that PLC systems conform to engineering standards promulgated by the Commission and adhere to industry approved standards designed to enhance the use of PLC systems. Is compliance with this IEEE standard required by the Commission’s rules (i.e. is this an industry approved standard designed to enhance the use of PLC systems)? Would compliance of PLC systems with this standard facilitate the sharing of these bands between amateur stations and PLC systems? Are there PLC systems deployed that do not comply with this standard?
Would compliance with this standard obviate the need for amateur stations to maintain a specific separation distance from transmission lines?

175.
We recognize that the separation distance required for PLC systems and amateur stations to coexist will depend on the power at which the amateur stations are permitted to transmit. We propose that amateur stations in the 135.7-137.8 kHz band be limited to a maximum EIRP of 1 W, as is required by footnote RR 5.67A, and which we adopted in the WRC-07 R&O. Is this EIRP limit appropriate for facilitating sharing between PLC systems and amateur stations? For the 472-479 kHz band, we propose to adopt transmitted power limits consistent with RR 5.80A. Amateur stations will be limited to an EIRP of 1 W in the portion of Alaska within 800 km of the Russian Federation and will be permitted to transmit at up to 5 W EIRP elsewhere. Is this EIRP limit appropriate for PLC systems and amateur stations to share this band? Should amateur stations be required to reduce their EIRP below 5 W when close to transmission lines and at what distances? We seek comment on these proposals.

176.
We also seek comment on the practical application of a separation distance requirement, and, specifically, what resources and information amateur radio operators will need to comply with our rules. Amateur licensees will have to determine the location of transmission lines in their vicinity to determine if they are permitted to operate stations using these frequency bands. The amateur licensees will need to differentiate transmission lines from the electric distribution lines that connect distribution substations to customer or house wiring. High voltage transmission lines are typically attached to large steel towers that are easy to identity. However, lower voltage transmission lines are typically attached to wooden poles. Although the wooden poles used for transmission lines are usually taller than the wooden poles used for distribution lines, we recognize that distinguishing the two types may not always be straightforward. We seek comment on whether amateur licensees will be able to identify the transmission lines in their locality. If amateur licensees are not able to reliably identify transmission lines, should we require amateurs or ARRL to affirmatively verify the locations of transmission lines with utilities or UTC before an amateur station begins transmitting?

178.
Lastly, we seek comment on additional service and operational rules that would be appropriate for amateur operations in these bands. According to ARRL, the tallest antenna that should reasonably be considered for an amateur station is 200 feet, because antennas with greater heights would
be required to obtain prior FAA approval and have to comply with FAA painting and lighting requirements. We note that adopting a maximum antenna height for amateur stations in these bands will aid in sharing of the spectrum with PLC systems by limiting the number of transmission lines that would potentially be in direct line-of-sight of amateur station antennas. We seek comment on what maximum antenna height, if any, we should adopt for amateur stations in these bands. 

179.
We also invite comment on whether to adopt transmitter power limits for amateur stations, in addition to the EIRP limits we are proposing. If so, we seek comment on what the power limits should be. We observe that, in the 2002 Amateur Radio NPRM, the Commission proposed to limit the maximum transmitter power in the 135.7-137.8 kHz band to 100 W PEP because of the possible difficulty of measuring the EIRP of an amateur station in this frequency range. Also, in 1998, ARRL submitted data for the 135.7-137.8 kHz band showing that relatively short antennas can only produce ranges of EIRP that are well below the ITU’s 1 W EIRP limit (i.e., 10-40 mW for a 100 foot antenna and 1-4 mW for a 50 foot antenna) with a transmitter power output of 200 W PEP. The Commission did not consider either power limit at that time, because, as noted above, it decided not to adopt an allocation for amateur operations in this band. Given that we have adopted such an allocation in the WRC-07 R&O above, do either the 2002 Amateur Radio NPRM or ARRL’s 1998 study provide a basis for determining transmitter power limits now? Should these transmitter power limits vary depending on antenna height – e.g. we could allow a 200 W PEP limit for antenna heights not exceeding 30.5 meters while permitting only 100 W PEP for taller antennas. Should the transmitter power limits differ between the 135.7-137.8 kHz band and the 472-479 kHz bands?

180.
In response to the WRC-07 NPRM, commenters addressed a number of steps that could facilitate amateur use of the 135.7-137.8 kHz band. Amateur operator John H. Davis (Davis) proposed that no amateur station should be automatically controlled to ensure that the amateur operator is able to quickly terminate transmissions if necessary. Davis also suggested that it may be appropriate to also prohibit software-driven modes that determine their own operating frequency without human intervention.
Should we adopt Davis’s suggestions? ARRL’s states that there is no rationale for limiting the occupied bandwidth in the 135.7-137.8 kHz band to less than the full 2.1 kilohertz, and that a stricter limit would not be conducive to experimentation with narrowband data emission modes in the future. Should we adopt any bandwidth limitation for either of the frequency bands? In the WRC-07 NPRM, the Commission requested comment on whether it should limit operating privileges in the 135.7-137.8 kHz band, e.g., to Amateur Extra Class licensees. None of the commenters believe that such a restriction would better facilitate Amateur/PLC sharing of the band. In particular, we note that ARRL states that it would be consistent with Commission policy to make this frequency band available to Amateur Extra, Advanced, and General Class licensees. Should we limit operating privileges for these bands in accordance with ARRL’s statement? Should we propose to authorize CW (international Morse code telegraphy), RTTY (narrow-band direct-printing telegraphy), and data emissions throughout the 630 and 2200 meter bands as we did for our 2200 meter band proposal in 2002? We also seek comment on amending Section 97.3 by adding definitions for the terms effective radiated power, isotropically radiated power, and LF.

181.
Other Allocated Uses. Other radio services use the 135.7-137.8 kHz band. In the U.S. Table, the 130-160 kHz band is allocated to the fixed service (FS) and maritime mobile service (MMS) on a primary basis for Federal and non-Federal use ... The 126.7-141.7 kHz band is also used to track tagged salmon in the Pacific watershed. We seek comment on whether we need
to adopt exclusion zones or use other methods to protect these Federal uses of the band. Should we delete the unused non-Federal allocations from this band? To be consistent with the International Table, we also propose to require that amateur fixed stations operating in the 2200 meter band not cause harmful interference to stations in the FS and MMS that are authorized by other nations and require that these amateur stations take any and all corrective action, if harmful interference is reported to us. We seek comment on these proposals.

It would appear that the nature of enquiry is extensive but it is the next step needed before the LF / MF bands will become a reality in the U.S.

Following publication of the NPRM in the Federal Register (see daily updates here to see when it appears), stakeholders will have 60 days to make comments. Comments can be written or posted via their online comment page once it is opened. A thirty-day reply-to-comments period then ensues.

One source that I have read indicates that there is usually about 12-18 months before NPRM publication and rule enactment, should there be no major stumbling blocks. Whenever the final decision to implement comes will depend on how the enquiry proceeds.

I would urge all those interested in seeing these band become a reality to file comments when the opportunity becomes available, following the Federal Register posting. Comments could include your opinions on power levels, methods of stating / measuring power levels, restrictions on operating near power transmission lines, modes allowed, etc. It is particularly important for U.S. experimental stations to file a detailed report on their operations, including accurate descriptions of antenna systems and transmitter details. As well, I would urge Canadian amateurs that have had experience operating on either of these two bands, to file comments regarding your experiences, with particular emphasis on the lack of interference caused to PLC signals and the lack of interference caused by PLC signals to your own operation. Rest assured that U.S. power authorities will be putting their resources ($$) into one last lobby for as many restrictions as possible and it is not in our interest for the NPRM comments to be one-sided in their favor.

Lets all hope for a swift outcome to something that has been taking far too long.
Steve McDonald, VE7SL, is a regular contributor to AmateurRadio.com and writes from British Columbia, Canada. Contact him at [email protected].

Hello, LHS listeners! In this episode we have a very special treat in store for you all. We have a personal talk with Dr. Christian Jacobs, though I suspect he'd be upset that we labeled him doctor. He's a Ph.D., done a great deal of work with fluid dynamics, and he also happens to be a ham radio operator. He programs using Python and he's written PyQSO, a great lightweight logging application. We talk to him about all these things and much, much more. Please enjoy.

73 de The LHS Guys

Russ Woodman, K5TUX, co-hosts the Linux in the Ham Shack podcast which is available for download in both MP3 and OGG audio format. Contact him at [email protected].

Sixbox 6m AM rig – a simple design

Several years ago I designed and built a derivative of my 2m Fredbox but for 6m AM. The same basic design would easily translate to a 10m version.  Both bands could be useful for cross-town natters, especially when both 10m and 6m behave like VHF bands, which is in the quieter sun years and at night on 10m. The Sixbox is simple and certainly capable of further development.

Treat the design as a starting point. A 10m version of the RX has copied transatlantic USA AM stations well, but this is NOT a rig for DX use. It is better suited to cross-town/inter-village natters.

See https://sites.google.com/site/g3xbmqrp3/vuhf/sixbox .

Roger Lapthorn, G3XBM, is a regular contributor to AmateurRadio.com and writes from Cambridge, England.

With the release this week of NPRM (FCC 15-50), U.S. amateurs have moved one small-step closer to seeing the 2200m and 630m bands become a thing of reality.

The NPRM seeks input on a number of questions that rulemakers are still pondering when it comes to implementation of the new bands. Stakeholders are requested to submit comments on a number of issues addressed in the document and have 60 days to do so once the document has been published in the Federal Register which is updated daily.

Following submission of comments, a number of options still remain open for FCC rulemakers and I rather suspect, from the vast scope of the NPRM's inquiry, that the process could drag on for some length of time yet. Take solace in the fact that the NPRM is indeed a necessary step in the right direction and shows that the proposals are moving forward, finally!

The major focus of the NPRM appears to be centered around determining appropriate levels of power and the viability of amateurs coexisting on the frequencies shared with Power Line Carrier (PLC) systems. Indeed the major stumbling block, at least as far as 2200m is concerned, has always been the strong objection from power authorities that amateur signals will interfere with their control signals. PLC interference as well as possible interference to the Maritime Mobile Service (MMS) is also cited as a concern for the 630m proposal. One might argue that lumping these two bands together in a single NPRM is the best way to go while others might say that chance of success would be much better by treating them separately ... time will eventually tell.

Getting into more detail, the NPRM commentary specifically affecting our LF/MF interests, address the following critical points (and present stumbling blocks):

167.
Service Rules for the 135.7-137.8 kHz and 472-479 kHz bands. We are proposing service rules for the amateur service in the 135.7-137.8 kHz and 472-479 kHz bands with the principal goal of enabling sharing of this spectrum among licensed amateur stations and unlicensed PLC systems.
As the demand for radio spectrum has continued to increase, we have sought to make more efficient use of spectrum by providing for sharing of frequency bands for multiple purposes.While we recognize the importance of PLC systems to the functioning of the electric power grid, we also believe that there are benefits to providing amateurs access to these bands, including providing amateurs with new opportunities for experimentation. Moreover PLC systems and the expected amateur use of these bands have characteristics which make coexistence possible. PLC systems are limited to use on transmissions lines and, consequently, are not present in most residential neighborhoods where amateur licensees live.
The amateur service is expected to use the band mainly for experimental purposes and not for routine and widespread communications activities common in other bands. These attributes give us confidence that,
along with appropriate technical rules, amateur stations can harmoniously operate on the same frequency bands as PLC systems.

168.
The cornerstone of the technical rules we are proposing is physical separation between amateur stations and the transmission lines upon which PLC systems may be present. We propose that amateur stations be permitted to operate in these bands when separated from transmission lines by a specified distance. Such a separation, in conjunction with limits on the amateur stations’ transmitted EIRP and antenna heights, will enable PLC systems and amateur stations to coexist in these bands. In addition, we propose to limit amateur stations to operations at fixed locations only to ensure that this separation distance can be maintained reliably. We seek comment on this overall framework.

169.
In order to develop the necessary and appropriate service rules to meet our goal of providing for the coexistence of amateur services and PLC systems in these bands, we seek detailed comment on the technical characteristics of both the PLC systems and the amateur stations. This information will allow us to set an appropriate separation distance. Although the Commission in the WRC-07 NPRM inquired into the technical rules and methods that would assure coexistence, commenters provided little in the way of concrete information. ARRL submitted a technical analysis based on an NTIA technical report supporting an assertion that PLC systems in the 135.7-137.8 KHz band will be sufficiently protected from amateur stations transmitting at an EIRP of 1 W with a separation distance of 1 km from the transmission lines carrying the PLC signals. However, this NTIA technical report is from 1985 and therefore may not account for any subsequent developments.

170.
To assist us in determining the optimal separation distance, we invite commenters to submit information on the technical characteristics of PLC systems that are currently being operated by utilities or likely to be deployed in the future. How tolerant are these PLC systems of signals received from other stations transmitting in the same band? What electric field strength at the location of a transmission line will cause a PLC system operating on that line to malfunction? What types of malfunctions would the electric power grid experience from electrical interference? How many PLC systems are currently operating in the 2200 and 630 Meter bands? Can these existing PLC systems be modified and could new PLC systems be designed to operate in other portions of the 9-490 kHz band, thus avoiding co-channel operation with amateur services? At what power do these PLC systems operate and how long are the transmission lines over which they send signals? At what voltage level do the transmission lines upon which these PLC systems are deployed operate and how does the PLC systems’ tolerance of other signals depend on the voltage level? What electric field strengths are produced in the vicinity of transmission lines by the PLC signals travelling over the transmission lines?

171.
We likewise invite information on the technical characteristics of amateur stations that are likely to be deployed or have operated under experimental licenses in these two bands. What electric field strength generated by PLC systems operating on transmission lines would impede the operation of
amateur stations? A study conducted on a PLC system operating at 1 W at 152 kHz found that the PLC system generated an electric field strengths of 20 dbμV/m at 1 km. Would a signal with this field strength interfere with the operation of amateur stations? Given that high-voltage transmission lines generate a significant level of noise at this frequency range, how close to high-voltage transmission lines can amateur stations realistically operate? In recent years amateur stations have operated in these bands
under experimental licenses with most licenses permitting powers of between 1 to 20 watts ERP. How close did these amateur stations operate to transmission lines? Did any of these amateur stations receive
signals from PLC systems operating on transmission lines? Do the experiences of amateur stations and utilities in other countries and along the United States border with Canada yield any useful information?

172.
If we were to adopt our proposal to permit amateur operations only when separated by a specified distance from transmission lines, when a new transmission line is built close by an amateur station, the station either would have to relocate farther away from the transmission line or cease
operating. How should our rules address the potential for new transmission lines to be constructed closer than the specified distance to pre-existing amateur stations? We do not want to inhibit the ability of either PLC systems or amateur services to grow and expand without imposing unnecessary burdens on either. Is it possible for utilities to refrain from geographically expanding their PLC operations within the relatively small portion of the 9-490 kHz band that we are making available for amateur operations, and is this something utilities would do on their own accord, given the Part 15 status of PLC systems? Should our rules explicitly prohibit utilities from deploying new PLC systems in these bands?

....to be cont'd



Steve McDonald, VE7SL, is a regular contributor to AmateurRadio.com and writes from British Columbia, Canada. Contact him at [email protected].

In this episode, Martin M1MRB / W9ICQ is joined by Leslie Butterfield (G0CIB) and Matthew Nassau (2E0MTT) to discuss the latest Amateur / Ham Radio news. Colin M6BOY rounds up the news in brief, and this episodes feature is International Marconi Day.

• New Entry Level Licence for Germany?
• Ofcom Considers 10.475 and 47 GHz Bands for 5G
• Digital Activity Days RDRC
• Ham Radio Operator Flies Model Tricopter
• FUNcube-1 Transmitting Again
• Australian Balloon Circumnavigates the Globe
• New Award Scheme for Portable Operators
• Surprise Decrease in Australian Ham Licence Renewal Fees

Colin Butler, M6BOY, is the host of the ICQ Podcast, a weekly radio show about Amateur Radio. Contact him at [email protected].

In this episode, Martin M1MRB / W9ICQ is joined by Leslie Butterfield (G0CIB) and Matthew Nassau (2E0MTT) to discuss the latest Amateur / Ham Radio news. Colin M6BOY rounds up the news in brief, and this episodes feature is International Marconi Day.

• New Entry Level Licence for Germany?
• Ofcom Considers 10.475 and 47 GHz Bands for 5G
• Digital Activity Days RDRC
• Ham Radio Operator Flies Model Tricopter
• FUNcube-1 Transmitting Again
• Australian Balloon Circumnavigates the Globe
• New Award Scheme for Portable Operators
• Surprise Decrease in Australian Ham Licence Renewal Fees

Colin Butler, M6BOY, is the host of the ICQ Podcast, a weekly radio show about Amateur Radio. Contact him at [email protected].

Depending on the solar cycle, and how good it is, both 10m and 6m can behave quite differently. Sometimes 10m is a true HF band with good worldwide DX possibilities. In better years, even 6m can support F2 worldwide propagation. However, for a lot of the solar cycle both 10m and 6m behave like VHF bands.  This means Es can be an effective mode on both bands especially in the spring and summer months. Other modes like tropo can also be used on 10m and 6m. Both bands can be used for local natters on any mode.

At the moment we are in a transition period. On better days 10m is still good for worldwide DX but as time progresses, it will behave more and more like a VHF band with long periods of quiet. Especially as we move to more VHF conditions modes like WSPR become even more useful: short DX openings can be detected with WSPR.   Leaving a simple WSPR rig running can be so useful and take very little power.

As I have mentioned before, I have worked real 10m N-S DX (11000+ km) on QRP SSB even in the quietest of sunspot years. WSPR is considerably better than SSB, requiring far less power and can be used unattended running in the background. I tend to run 10m and 6m WSPR most days and monitor WSPRnet on a different PC in the lounge.  It takes just seconds to go into the shack and make any adjustments needed.  It means, whilst running WSPR, you can do other things.

Roger Lapthorn, G3XBM, is a regular contributor to AmateurRadio.com and writes from Cambridge, England.