September 2018 - AMSAT-BB - mailman.amsat.org

ANS-245 AMSAT News Service Weekly Bulletin
by Frank Karnauskas 02 Sep '18

02 Sep '18

AMSAT NEWS SERVICE ANS-245 The AMSAT News Service bulletins are a free, weekly news and information service of AMSAT North America, The Radio Amateur Satellite Corporation. ANS publishes news related to Amateur Radio in Space including reports on the activities of a worldwide group of Amateur Radio operators who share an active interest in designing, building, launching and communicating through analog and digital Amateur Radio satellites. The news feed on http://www.amsat.org publishes news of Amateur Radio in Space as soon as our volunteers can post it. Please send any amateur satellite news or reports to: ans-editor at amsat dot org. You can sign up for free e-mail delivery of the AMSAT News Service Bulletins via the ANS List; to join this list see: http://www.amsat.org/mailman/listinfo/ans In this edition: * DMR Station QRM's AO-92 Uplink * AMSAT Announces New Store on Zazzle * AMSAT Rover Award Updates * AO73/FUNcube-1 Entering a Further Period of Full Sunlight * VUCC Awards-Endorsements for August 2018 * 2018 ARRL/TAPR DCC Preliminary Schedule Announced * Interns Create Visualization of NASA Space-Ground Communications * AMSAT Board of Director Elections Corrected Ballots Due September 15, 2018 * Call for Volunteers, ANS Seeks Rotating Editors * Upcoming Satellite Operations * ARISS News * Satellite Shorts from All Over SB SAT @ AMSAT $ANS-245.01 ANS-245 AMSAT News Service Weekly Bulletins AMSAT News Service Bulletin 245.01 >From AMSAT HQ KENSINGTON, MD. September 2, 2018 To All RADIO AMATEURS BID: $ANS-245.01 DMR Station QRM's AO-92 Uplink On August 27th, AMSAT Vice President-Operations Drew Glasbrenner, KO4MA, noted: "Recently there has been a DMR signal QRM'ing the AO-92 uplink on 435.350 or close by. Hotspots, repeaters, terrestrial simplex (anything not satellite) should not be in 145.8-146.0 or 435-438 by international bandplan. Please QSY these radios ASAP. Please share to DMR, D-star, Fusion, P25 groups and similar, thank you!" For amateur operators in the U.S., FCC Part 97 has a bit to say about the way we should operate in the 145.8-146.0 and 435-438 MHz amateur satellite subbands. Regulations in many other countries are not as detailed as those established by the FCC on how we should operate on different frequencies and bands. This includes where hotspots and similar systems used for digital voice modes (i.e., DMR, D-Star, C4FM/Fusion) and other technologies like EchoLink and IRLP, should operate. Auxiliary stations are defined at 97.3(a)(7): "An amateur station, other than in a message forwarding system, that is transmitting communications point-to-point within a system of cooperating amateur stations." This definition includes "remote bases;" the nodes for systems like EchoLink and IRLP; and hotspots used for digital-voice modes like D- Star, DMR, and Fusion/C4FM (among others); as well as stations using these hotspots and nodes. Auxiliary stations are not allowed in the 145.8-146.0 and 435-438 MHz satellite subbands per 97.201(b) - among other subbands in the 2m and 70cm amateur bands. Repeaters are defined at 97.3(a)(40) as: "Repeater. An amateur station that simultaneously retransmits the transmission of another amateur station on a different channel or channels." Since most hotspots are operating on a single frequency, they would not qualify as a repeater. Even if the hotspot operates like a repeater as defined above, repeaters are not permitted to use 145.5-146.0 MHz and 435-438 MHz per 97.205(b). Beyond these two sections, Part 97 also has 97.101(a): "In all respects not specifically covered by FCC Rules each amateur station must be operated in accordance with good engineering and good amateur practice." Whether the hotspot is interfering with a satellite downlink in a particular area, or it is interfering with the satellite uplink affecting a much larger area, this would not be good amateur practice. In addition to subbands where hotspots are not permitted, 97.101(b) is also relevant: "Each station licensee and each control operator must cooperate in selecting transmitting channels and in making the most effective use of the amateur service frequencies. No frequency will be assigned for the exclusive use of any station." Frequencies used by satellites are usually incapable of being changed, and have been registered with a regulator like the FCC and the ITU. Hotspots are usually frequency-agile, and the frequencies used by those systems can be changed to avoid potential interference to satellites and other stations. And all of this is in addition to local bandplans, which may already have provisions for hotspots or simplex nodes. [ANS thanks Patrick Stoddard, WD9EWK, for the above information.] --------------------------------------------------------------------- AMSAT Announces New Store on Zazzle AMSAT is pleased to announce a new storefront on Zazzle. Currently, we have several products available with the AMSAT logo, including t- shirts, hooded sweatshirts, mugs, mousepads, and stickers. Colors and styles for each product are fully customizable. Even kids sizes and athletic wear are available through the customization options. Now you can outfit the whole family in AMSAT logo gear! 25% of the purchase price of each product goes towards Keeping Amateur Radio in Space. The storefront can be accessed at https://www.zazzle.com/amsat_gear Stay tuned as we add more products to the storefront over the coming days and weeks. [ANS thanks Paul Stoetzer the above information.] --------------------------------------------------------------------- AMSAT Rover Award Updates The AMSAT Rover award is granted to stations who achieve a combined 25 points using any combination of the roving achievements posted at: https://www.amsat.org/amsat-rover-award/ Since the last update in ANS-210, the following awards have been announced: Award Call Date Issued ------ ------- ----------- 028 K4FTP 30 Jul 2018 029 KB2YSI 15 Aug 2018 030 N3CRT 17 Aug 2018 031 N2WLS 19 Aug 2018 032 K2MTS 22 Aug 2018 [ANS thanks Bruce Paige, KK5DO, AMSAT Director Contests and Awards for the above information] --------------------------------------------------------------------- AO73/FUNcube-1 Entering a Further Period of Full Sunlight AO73/FUNcube-1 has been in space for almost five years and the original Sun Synchronous Orbit has now changed slightly such that the spacecraft will no longer be in eclipse for 35 mins every orbit. The eclipse period has already reduced and will again become zero on September 8, 2018. This means that our usual autonomous switching between transponder on in eclipse and high-power telemetry when in sunlight will no longer be effective! This schedule was originally planned to provide a very strong telemetry signal for schools to use during daylight hours and for amateur operation at night (and also at weekends and over holidays). We have already experienced a short period of full sunlight but this time it looks like the spacecraft will be in this situation for more than eight months until sometime in April next year. In addition to the additional thermal effect that will occur during this period, we also expect that the spin rate will increase. The reason for this effect is not yet fully understood but may be related to the amount of current flowing from the solar panels to the spacecraft bus being sufficient to cause a torque effect with the earth's magnetic field. We have therefore decided to have AO73/FUNcube-1 initially operate for alternate periods of one week in either safe or educational modes. This should enable us to evaluate whether the currents do affect the spin rate. Safe mode provides low power telemetry and education mode the usual high power telemetry. It will also enable an analysis to see whether the satellite becomes hotter or cooler in each mode. This will be a new experience for the spacecraft so the capture of the largest possible amount of telemetry remains an important tool for the team to have. We are very grateful to everyone who continues to upload the telemetry they have received to the Data Warehouse. It is invaluable. In addition to AO73/FUNcube-1, the FUNcube-2 transponder on UKube-1 remains operational and EO88/Nayif-1 continues to operate autonomously with the transponder on when in eclipse and high- power telemetry in sunlight. LAST MINUTE UPDATE: AO73 is now in safe mode (low power beacon only, no transponder). We have set this mode as the satellite is about to enter a period of continuous sunlight (for about 9 months). There is more information at https://funcube.org.uk/news/ The plan is to change to education mode (high power beacon) next Friday. [ANS thanks Jim, G3WGM and the FUNcube team for the above information.] --------------------------------------------------------------------- VUCC Awards-Endorsements for August 2018 CALL 01Aug 01Sep N8RO 1051 1060 WI7P 829 835 WA5KBH 728 738 W5RKN 606 634 N6UK 568 626 N9EAT 428 550 WD9EWK 476 485 KE4AL 429 467 AA8CH 316 351 NS3L 325 350 W7QL 300 350 FG8OJ 200 253 N3GS 198 226 KE8FZT 200 225 N3CRT New 200 AC9E New 150 WW8W 103 128 AD0HJ New 100 N7NEV New 100 W4AQT New 100 If you find errors or omissions. please contact me off-list at <mycall>@<mycall>.com and I'll revise the announcement. This list was developed by comparing the ARRL .pdf listings for August 1, 2018 and September 1, 2018. It's a visual comparison so omissions are possible. Apologies if your call was not mentioned. Thanks to all those who are roving to grids that are rarely on the birds. They are doing most of the work! [ANS thanks Ron, W5RKN for the above information.] --------------------------------------------------------------------- 2018 ARRL/TAPR DCC Preliminary Schedule Announced Saturday Night Banquet Towards A 21st Century Understanding of Earth's Upper Atmosphere: The Value of Radio Based Amateur-Scientist Partnerships by Dr. Philip J. Erickson, W1PJE, Assistant director & head of MIT's Atmospheric and Geospace Sciences group at Haystack Observatory. https://www.tapr.org/dcc#banquet Sunday Morning Seminar The Citizen Weather Station Project by Nathaniel A. Frissell, Ph.D., Assistant Research Professor, Center for Solar-Terrestrial Research, New Jersey Institute of Technology, W2NAF. https://www.tapr.org/dcc#seminar The complete Technical & Introductory Forum Tracks schedule can be viewed at https://tinyurl.com/2018-DCC-Schedule DCC Online Registration is at: https://www.tapr.org/dccregistration.php [ANS thanks Mark, WB9QZB for the above information.] --------------------------------------------------------------------- Interns Create Visualization of NASA Space-Ground Communications For the first time ever, people worldwide can get an inside look into what it takes to enable communications for nearly 40 NASA missions, thanks to a small team of college students. NASA's Near Earth Network (NEN) leverages more than 15 antennas across the globe to provide a downlink for critical space and Earth science data collected by the agency's satellites. A new web-based app called NEN Now shows, in real time, simulations of the complicated maneuvers these antennas undergo to link with passing satellites, following them from horizon to horizon as the data streams to the ground. "NEN Now opens a window to the public, sharing live updates about which of NASA's spacecraft are communicating with the Near Earth Network," said Barbara Adde, director of policy and strategic communications for the Space Communications and Navigation (SCaN) program office at NASA Headquarters. "Curious about what NASA is studying? You can click on a link and find out what research that spacecraft is collecting data for and sending down to Earth right at that moment." Not only will NEN Now help the public understand space-to-ground communications systems, but the tool will help technical and project managers monitor the status of the network in detail, providing information such as the actual position of the antennas' dishes. At SCaN's request, Goddard modeled NEN Now after a similar app, called DSN Now, built by NASA's Jet Propulsion Laboratory in Pasadena, California, for the Deep Space Network (DSN). The DSN provides communications services for missions in deep space and is managed by JPL. Ryan Turner, a ground system manager, had an idea to efficiently and effectively develop the NEN app at Goddard by leveraging the skills of college students and utilizing experienced engineers to provide guidance. "We started with three interns, who worked with the public engagement team, NEN engineers and the GMSEC to lay out a prototype," Turner said. GMSEC is the Goddard Mission Services Evolution Center, which creates data system solutions across multiple projects and disciplines. "It gave everyone a sense of what would be possible if we created an operational version of the system." Naje Fields was one of the first interns on the project in summer 2015. "Our biggest challenge for the prototype phase was to figure out how to get the data from the real-time status server at [NASA's Wallops Flight Facility in Virginia] to Goddard and into our app," she said. She and her partners, Kierra Harrison and Wallace Phillips, used a number of networking and security techniques to make it happen. The prototype might have been ambitious for three college interns to complete over the course of 10 weeks, but it was very well- received, allowing Turner to establish a year-round program and to take on more interns in the following summers. Those groups have worked on multiple projects, including adding commercial ground stations to NEN Now, implementing a NEN Now mobile app, designing the Space Network (SN) Now for Goddard's other communications network, and developing a 3D interface for NEN Now. Both NEN Now and DSN Now have been incorporated into a larger app called SCaN Now. An additional application for SCaN's third network, the Space Network, is also being created by this intern team, rounding out the real-time status display capability for all three of SCaN's communications networks. NEN Now is now available to the public at: SCaN Now https://scan-now.gsfc.nasa.gov NeN Now https://scan-now.gsfc.nasa.gov/nen NeN Home https://www.nasa.gov/directorates/heo/scan/services/networks/nen DSN Now https://eyes.nasa.gov/dsn/dsn.html DSN Home https://deepspace.jpl.nasa.gov/ [ANS thanks NASA for the above information] --------------------------------------------------------------------- AMSAT Board of Director Elections Corrected Ballots Due September 15, 2018 Corrected ballots were mailed and members should have received them. The new ballots, labeled "CORRECTED BALLOT 7/20/2018" are printed on yellow-colored cardstock. Using the Yellow Ballots, please vote for no more than three of the 2018 candidates: Tom Clark, K3IO Mark Hammond, N8MH Scott Harvey, KA7FVV Bruce Paige, KK5DO Peter Portanova, W2JV Candidate biographies can be viewed at: https://www.amsat.org/bios2018/ The Directors positions will go to the three candidates receiving the highest number of votes. In addition, there will be two alternate members chosen, based on the next highest number of votes received. Ballots must be received at the AMSAT office by September 15, 2018 in order to be counted. Those sent outside North America were sent via air mail. If you have not received your ballot package in a reasonable time for your location, please contact the AMSAT office. Completed ballots should be returned as promptly as possible, and those from outside North America preferably by air mail. [ANS thanks AMSAT for the above information.] --------------------------------------------------------------------- Call for Volunteers, ANS Seeks Rotating Editors The AMSAT News Service (ANS) is seeking volunteers to serve as rotating editors for its weekly newsletter. Editors work on a rotating schedule, each taking a different turn editing a specific week's newsletter as scheduled by the ANS Editor in Chief. Editors support each other by seeking and reporting to the Editor of the week, information and resources of interest to the AMSAT community. The number of newsletters assigned will be dependent upon the number of available editors at any given time. The average editor can expect to spend, on average, 4-5 hours for each newsletter, dependent on available material. Prospective editors are required to be AMSAT members in good standing and have a genuine interest in satellite operation and an understanding of AMSAT's mission. Former editing experience is a plus but not required. If interested, please submit an inquiry, including your contact information to ans-editor at amsat.com. [ANS thanks the ANS editors for the above information] --------------------------------------------------------------------- Upcoming Satellite Operations as of 8/29/2018 + DM56, DM57, DM58, DM59 - September 1-3, 2018 Ron, AD0DX, is heading out again. This time, he will be operating in DM56, DM57, DM58, and DM59. Updates will be posted on Twitter, publicly viewable at https://twitter.com/ad0dx. + Next weekend, (9/8 and 9/9) is the Boxboro (Mass) ham radio convention, the biggest in New England. There will be an AMSAT booth there, and in addition, the Nashua Area Radio Society will be holding an exposition for young people, which will include a big satellite station. Please listen for special event station N1T or club call N1FD during both days, and possibly testing on Friday, and be nice if there are newbies trying for their first contact! In addition, the AMSAT forum will take place all Sunday morning and will include demos of satellite contacts using a handheld and an HT. Please try for QSOs with on FM satellites Sunday morning from Bob Hayes KB1SWZ (not known if he will use a special event call sign). KE4AL, please post on the the AMSAT web site if you can! Thanks all! 73, Burns Fisher, WB1FJ AMSAT Fox-1 Flight Software Member, Nashua Area Radio Society + AMSAT-EA Special Event - AM1SAT - September 10-17, 2018 As part of the IV RadioHam Fair IberRadio 2018 activities, AMSAT- EA members, using the special event call sign AM1SAT, will be activating 14 grid squares across Spain from September 10th to September 17th. AMSAT-EA is offering an AM1SAT Special Award in two categories: SILVER and GOLD. More information, to include rules and log submission instructions, is available on QRZ: https://www.qrz.com/db/am1sat Northern Michigan (EN76, EN85, EN86) - September 15-18, 2018 Chris, AA8CH is heading back to northern Michigan and Drummond Island as follows: September 15: EN76, EN85 September 16: EN85, EN86 September 17: EN85, EN86 September 18: EN76, EN85 Anyone who missed Chris from N8R in July and/or needs any of these grids can send me an email (see QRZ) and he'll keep you in the loop for expected passes. [ANS thanks Robert, KE4AL for the above information.] --------------------------------------------------------------------- ARISS News + Upcoming ARISS Contact Schedule as of 2018-08-07 18:00 UTC Integrierte Gesamtschule Osterholz-Scharmbeck, Osterholz - Scharmbeck, Germany and Gymnasium Soltau, Soltau, Germany, direct via DN3HB and DN5ABG. The ISS callsign is presently scheduled to be DPØISS. The scheduled astronaut is Alexander Gerst KF5ONO. Watch for new contact time. Study Hall, Lucknow, Uttar Pradesh, India, telebridge via K6DUE. The ISS callsign is presently scheduled to be NA1SS. The scheduled astronaut is Serena Aunon-Chancellor KG5TMT. Contact is a go for: Wed 2018-09-05 08:05:53 UTC 33 deg. Mendez Fundamental Intermediate School, Santa Ana, CA, direct via AA6TB. The ISS callsign is presently scheduled to be NA1SS. The scheduled astronaut is Ricky Arnold KE5DAU. Contact is a go for: Thu 2018-09-06 16:49:52 UTC 81 deg. + Completed ARISS Contacts About Gagarin from Space conducted A Session of Radio-Love Communication with students and aspirants in G. Kursk. Russia, direct via RV3DR. The ISS callsign was RSØISS and the scheduled astronaut was Oleg Artemyev. The contact was successful at 2018-08-25 08:19 UTC. Congratulations to the students and Oleg! [ANS thanks Charles, AJ9N for the above information.] --------------------------------------------------------------------- Satellite Shorts From All Over + The AMSAT Office will be closed through September 4th. It will reopen on Wednesday, September 5th. [ANS thanks Martha Saragovitz for the above information.] + The Symposium Schedule for the 2018 AMSAT-NA 36th Annual Space Symposium and General meeting has been published and can be viewed at: https://www.amsat.org/symposium-schedule/ [ANS thanks Robert, KE4AL for the above information.] + ARRL Youth Satellite Operators get News Coverage Three youthful members of the Montgomery Amateur Radio Club were recognized by the Montgomery Advertiser as avid amateur radio satellite operators. Bryant Rascoll, 14, recently received the 2018 Bill Pasternak Memorial Radio Newsline "Young Ham of the Year. Warren Whitby, 16, received this year's ARRL "Alabama Outstanding Youth Ham Award" in Huntsville. Marissa Robledo, 11, was been named first runner up for the Alabama Outstanding Youth Ham Award. The complete news story can be read at https://tinyurl.com/three-youth. [ANS thanks JoAnne, K9JKM for the above information.] + New Distance Record FalconSat-3 Claimed A new @AMSAT distance record is claimed via the FalconSat-3 digipeater: 2,955 km. W8LR in EM79tm <> KB6LTY in DM14jl on 26-Aug-2018 at 00:47 UTC. [ANS thanks W8LR for the above information.] + Petition to save WWV/WWVH The National Institute of Standards and Technology (NIST) has eliminated funding for the continued operation of time/frequency standard stations WWV and WWVH in its Fiscal Year 2019 budget. WWVB, on 60 kHz, which provides time data for so-called "atomic clocks," would continue to be funded. One petition started on the White House's "We the People" petition site calls for restoration of funding for these two radio stations. It needs at least 100,000 electronic signatures by mid-September to generate a response from the White House. The petition can be found at: <https://petitions.whitehouse.gov/petition/maintain-funding-nist- stations-wwv-wwvh> (As of now, needs just over 90,000 more signatures by September 15) [ANS thanks CQ Magazine for the above information.] --------------------------------------------------------------------- /EX In addition to regular membership, AMSAT offers membership in the President's Club. Members of the President's Club, as sustaining donors to AMSAT Project Funds, will be eligible to receive addi- tional benefits. Application forms are available from the AMSAT Office. Primary and secondary school students are eligible for membership at one-half the standard yearly rate. Post-secondary school students enrolled in at least half time status shall be eligible for the stu- dent rate for a maximum of 6 post-secondary years in this status. Contact Martha at the AMSAT Office for additional student membership information. 73 and Remember to help keep Amateur Radio in space, This week's ANS Editor, Frank Karnauskas, N1UW n1uw at amsat dot org

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Satellite operations next weekend
by Burns Fisher (AMSAT) 02 Sep '18

02 Sep '18

Hi, Next weekend, (9/8 and 9/9) is the Boxboro (Mass) ham radio convention, the biggest in New England. There will be an AMSAT booth there, and in addition, the Nashua Area Radio Society will be holding an exposition for young people, which will include a big satellite station. Please listen for special event station N1T or club call N1FD during both days, and possibly testing on Friday, and be nice if there are newbies trying for their first contact! In addition, the AMSAT forum will take place all Sunday morning and will include demos of satellite contacts using a handheld and an HT. Please try for QSOs with on FM satellites Sunday morning from Bob Hayes KB1SWZ (not known if he will use a special event call sign). KE4AL, please post on the the AMSAT web site if you can! Thanks all! 73, Burns Fisher, WB1FJ AMSAT Fox-1 Flight Software Member, Nashua Area Radio Society

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VUCC Awards-Endorsements for August 2018
by Ronald G. Parsons 01 Sep '18

01 Sep '18

Here are the endorsements and new VUCC Satellite Awards issued by the ARRL for the period August 1, 2018 through September 1, 2018. Congratulations to all those who made the list this month! CALL 01Aug 01Sep N8RO 1051 1060 WI7P 829 835 WA5KBH 728 738 W5RKN 606 634 N6UK 568 626 N9EAT 428 550 WD9EWK 476 485 KE4AL 429 467 AA8CH 316 351 NS3L 325 350 W7QL 300 350 FG8OJ 200 253 N3GS 198 226 KE8FZT 200 225 N3CRT New 200 AC9E New 150 WW8W 103 128 AD0HJ New 100 N7NEV New 100 W4AQT New 100 If you find errors or omissions. please contact me off-list at <mycall>@<mycall>.com and I'll revise the announcement. This list was developed by comparing the ARRL .pdf listings for August 1, 2018 and September 1, 2018. It's a visual comparison so omissions are possible. Apologies if your call was not mentioned. Thanks to all those who are roving to grids that are rarely on the birds. They are doing most of the work!

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2018 ARRL/TAPR DCC Call for Technical Papers & Presentations
by Mark Thompson 01 Sep '18

01 Sep '18

2018 ARRL/TAPR DCC (Digital Communications Conference) http://www.tapr.org/dcc September 14-16 Albuquerque, New Mexico Call for Technical Papers & Presentations at DCC The ARRL and TAPR DCC is an international forum for radio amateurs to meet, publish their work, and present new ideas and techniques. Presenters and attendees will have the opportunity to exchange ideas and learn about recent hardware and software advances, theories, experimental results, and practical applications. All digital topics are covered at the DCC including Digital Voice, Data & Video, SDR, DSP, Precise Timing, Spread Spectrum, Networking Tecnologies Mesh Networking. Technical papers are being solicited for presentation at the ARRL and TAPR Digital Communications Conference (DCC) and printed in the annual Conference Proceedings published by the ARRL. Presentation at the conference is not required for publication although authors who attend receive priority for a scheduling a presentation during the technical forums. If you would like to present a technical topic at the DCC and not submit a technical paper email the topic of your presentation to the TAPR Office at: taproffice(a)tapr.org Submission of technical papers for publication should be submitted ASAP to Maty Weinberg, ARRL 225 Main Street Newington, CT 06111 or via the Internet to maty(a)arrl.org More details about technical papers and guidelines for paper submissions are available at: http://www.tapr.org/dcc#dcccallforpapers

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Antenna design considerations
by Hans BX2ABT 01 Sep '18

01 Sep '18

I'm slowly working towards building my own cross yagis for my home setup. I started learning to use MMANA-GAL in order to model the antennas and also looking for materials to build them. I found 8 mm aluminium round tubing for the elements and 3/8" square tubing for the boom. The cross boom is going to be 2" fiberglass, so I don't necessarily have to choose for foremast installation. I decided to settle on loop fed array yagis (LFA) because they are directly fed with coax cable. First question: any reasons for not using LFAs for cross yagis? Second question: what is the sweet spot between number of elements, beam width and boom length (for both 2m and 70cm antennas)? A lot of elements means more gain, a narrower beam width, but also a longer boom and more careful tracking. I haven't got any experience with working sats and I wonder what is better: a couple of more dB gain, or a slightly wider beam and a more compact antenna? So far I modelled a 4-element and 5-element LFA for 2 meters. The 5-element has a 1 dB gain advantage over the 4-element one, a 3 dB better F/B ratio, but is 2 meters in boom length, so that is quite substantial. Any input appreciated. Cheers. --Hans (BX2ABT)

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