Articles https://vhf.nz/ en Prohibiting illegal use of two way radios https://vhf.nz/node/537 <span property="dc:title" class="field field--name-title field--type-string field--label-hidden">Prohibiting illegal use of two way radios</span> <span rel="sioc:has_creator" class="field field--name-uid field--type-entity-reference field--label-hidden"><a title="View user profile." href="/users/zl2hd" lang="" about="/users/zl2hd" typeof="schema:Person" property="schema:name" datatype="" class="username">ZL2HD</a></span> <span property="dc:date dc:created" datatype="xsd:dateTime" class="field field--name-created field--type-created field--label-hidden">Thu, 08/02/2018 - 17:08</span> <div class="field field--name-taxonomy-vocabulary-1 field--type-entity-reference field--label-above field--entity-reference-target-type-taxonomy-term clearfix"> <div class="field__label">WVHFG Categories</div> <div class="field__items"> <div class="field__item"><a href="/categories/articles" hreflang="en">Articles</a></div> </div> </div> <div property="content:encoded" class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>Prohibiting illegal use of two way radios</p> <p>The RSM Compliance team are working on a Prohibition Notice to limit the import and illegal use of a range of low end two way radios. </p> <p>There are a variety of these radios on the market, like Baofeng, Pofung and Woxun for example. They allow users to programme their own frequency from the front panel or via a USB cable.  Although designed for the Amateur Radio Operator, these radios in the wrong hands have been attributed to malicious calls on police, forestry and rail frequencies.</p> <p>The import of Amateur two way radios locked to the Amateur bands won’t be affected by this new Notice.</p> <p>(From <a href="http://rsm.cmail20.com/t/ViewEmail/r/F2F0BD4323D2D6402540EF23F30FEDED">http://rsm.cmail20.com/t/ViewEmail/r/F2F0BD4323D2D6402540EF23F30FEDED</a>)</p> </div> Thu, 02 Aug 2018 05:08:17 +0000 ZL2HD 537 at https://vhf.nz Digital Television Update https://vhf.nz/node/494 <span class="field field--name-title field--type-string field--label-hidden">Digital Television Update</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><a title="View user profile." href="/user/1" lang="" about="/user/1" typeof="schema:Person" property="schema:name" datatype="" class="username">VHFAdmin</a></span> <span class="field field--name-created field--type-created field--label-hidden">Mon, 12/12/2016 - 23:18</span> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>Radio Spectrum Management has granted a short-term licence, number 256129, for additional tests of Digital Amateur Television transmissions from our Mt Belmont site.</p> <p>The first transmissions will consist of an un-modulated carrier on 506 MHz during testing of the modified transmitting antenna. The dates and times of these tests will be notified on this website.</p> </div> <div class="field field--name-taxonomy-vocabulary-1 field--type-entity-reference field--label-above field--entity-reference-target-type-taxonomy-term clearfix"> <div class="field__label">WVHFG Categories</div> <div class="field__items"> <div class="field__item"><a href="/categories/articles" hreflang="en">Articles</a></div> <div class="field__item"><a href="/categories/news" hreflang="en">News</a></div> <div class="field__item"><a href="/categories/projects" hreflang="en">Projects</a></div> </div> </div> Mon, 12 Dec 2016 10:18:51 +0000 VHFAdmin 494 at https://vhf.nz Digital Television tests - Bulletin No 11 https://vhf.nz/datv11 <span class="field field--name-title field--type-string field--label-hidden">Digital Television tests - Bulletin No 11</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><a title="View user profile." href="/user/1" lang="" about="/user/1" typeof="schema:Person" property="schema:name" datatype="" class="username">VHFAdmin</a></span> <span class="field field--name-created field--type-created field--label-hidden">Sun, 07/12/2015 - 11:41</span> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>A further series of mobile field strength test runs along Stratton Street has been performed, and a report is being prepared for consideration by the interested parties.</p> <p>An inspection of the BQ32 sheet of the Topo50 map series shows that some receive locations on Stratton Street are line-of-sight from Belmont and are heavily obstructed from transmitters using the adjacent 494 to 502 MHz and 510 to 518 MHz bands, potentially resulting in reception in these bands having an unfavourable signal-to-noise ratio, caused by any out-of-band radiation of the DATV transmitter.</p> <p>Readers of Q-Bit have noted the extreme measures that we have taken, so far, in the DATV exciter, up-conversion mixer, power amplifiers, output filters and corrosion-free transmitting antennas, to ensure minimal out-of-band radiation.</p> <p>Non-interference with adjacent-channel services has been a condition of past DATV licences and will be a condition of future DATV licences</p> </div> <div class="field field--name-taxonomy-vocabulary-1 field--type-entity-reference field--label-above field--entity-reference-target-type-taxonomy-term clearfix"> <div class="field__label">WVHFG Categories</div> <div class="field__items"> <div class="field__item"><a href="/categories/articles" hreflang="en">Articles</a></div> <div class="field__item"><a href="/categories/news" hreflang="en">News</a></div> <div class="field__item"><a href="/categories/projects" hreflang="en">Projects</a></div> </div> </div> Sat, 11 Jul 2015 23:41:14 +0000 VHFAdmin 474 at https://vhf.nz Accurate Transmitting Antenna Locations Using Global Positioning System (GPS) Satellites https://vhf.nz/gps <span class="field field--name-title field--type-string field--label-hidden">Accurate Transmitting Antenna Locations Using Global Positioning System (GPS) Satellites</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><a title="View user profile." href="/user/74" lang="" about="/user/74" typeof="schema:Person" property="schema:name" datatype="" class="username">ZL2TAR</a></span> <span class="field field--name-created field--type-created field--label-hidden">Sat, 06/20/2015 - 09:13</span> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"></div> <div class="field field--name-taxonomy-vocabulary-1 field--type-entity-reference field--label-above field--entity-reference-target-type-taxonomy-term clearfix"> <div class="field__label">WVHFG Categories</div> <div class="field__items"> <div class="field__item"><a href="/categories/articles" hreflang="en">Articles</a></div> </div> </div> Fri, 19 Jun 2015 21:13:51 +0000 ZL2TAR 469 at https://vhf.nz Tactical Amateur Radio Digital Internet Solution https://vhf.nz/node/466 <span property="dc:title" class="field field--name-title field--type-string field--label-hidden">Tactical Amateur Radio Digital Internet Solution</span> <span rel="sioc:has_creator" class="field field--name-uid field--type-entity-reference field--label-hidden"><a title="View user profile." href="/user/8" lang="" about="/user/8" typeof="schema:Person" property="schema:name" datatype="" class="username">ZL4JY</a></span> <span property="dc:date dc:created" datatype="xsd:dateTime" class="field field--name-created field--type-created field--label-hidden">Tue, 04/07/2015 - 05:15</span> <div class="field field--name-taxonomy-vocabulary-1 field--type-entity-reference field--label-above field--entity-reference-target-type-taxonomy-term clearfix"> <div class="field__label">WVHFG Categories</div> <div class="field__items"> <div class="field__item"><a href="/categories/arec" hreflang="en">AREC</a></div> <div class="field__item"><a href="/categories/articles" hreflang="en">Articles</a></div> <div class="field__item"><a href="/categories/projects" hreflang="en">Projects</a></div> </div> </div> <div property="content:encoded" class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p><strong>Using the Spark free WiFi zones for Internet access</strong></p> <p>Need a digital radio hotspot for an AREC operation, a demonstration at a branch meeting, or something like the recent VHF Convention?</p> <p>Telecom, now Spark, operate a network of more than 1,000 WiFi access points conveniently located on many public telephone call boxes around the country.  The commercial terms of the service are essentially free WiFi for Spark on-account mobile customers subject to a 1GB limit per day for up to five devices per account.</p> <p>At VHF Convention this year we needed a good internet connection for demonstrations of DMR and P25 STSP repeaters connected to their respective DMR MARC and Quantar Site Connect international networks.</p> <p><img alt="" src="/files/DMR%20P25.jpg" /> </p> <p>The connection method described here would also work for a D-STAR™ hotspot (D-STAR is a registered trademark of Icom Incorporated).  We explored various options for Internet access including a 4G cellular, an unlicensed 5.8GHz spur from the local Branch 69 DMR repeater site, or an unlicensed hop from my own QTH, but the phone box connection quickly presented itself as the ideal solution.</p> <p>I’m calling this the tactical amateur radio digital internet solution or TARDIS for short.</p> <p>Making an Internet connection to a public WiFi access point is easy, you just fire up your laptop or tablet and connect right?  While it is easy to connect mobile devices to a WiFi access points it turns out to be a bit harder to find a decent standalone WiFi client mode solution for providing Internet access at an RJ45 Ethernet interface.  This mode is not offered on typical domestic WiFi routers although certain WiFi routers can be loaded with the free DD-WRT third party GPL licensed firmware to do this. </p> <p>My preferred approach to unlicensed wireless is the Ubiquiti Networks range of high-end consumer grade hardware and for this job the Bullet M2 was the go to solution.  The M2 was coupled with a 1m x 0.75m 2.4GHz 23dBi grid left over from a past linking project (unlicensed point to point links these days are best done on 5.8GHz because of the high levels of interference present on the 2.4 GHz band).  The antenna was mounted inside beaming out an upper floor window as show in this image from Steve ZL2KG.</p> <p><img alt="" src="/files/WCC.jpg" /></p> <p>For VHF Convention 2015 at Waikanae this grid, mounted on a surveyor’s tripod with vice grips, gave an excellent received signal level of -47dBm at the venue over the slightly obstructed path distance of 150m to the Spark public call box on the corner of Ngaio Road and SH1 as shown in this Google Street Veiw image.</p> <p><img alt="" src="/files/spark%20wifi_0.jpg" /></p> <p>The next challenge in establishing such a link is managing the connection arrangements put in place by the WiFi access point operator.  The usual drill is connect to the access point and establish your credentials via a web page before being permitted free access.  With Spark this involves entering your mobile number and receiving a code via text on your mobile phone.  The access points tracks who is authenticated via the hardware MAC address of the mobile device’s WiFi chipset.</p> <p>After initial path alignment the Ubiquity M2 was configured to operate only with the SSID of the Spark network.  The router mode of the M2 was used with DHCP and NAT enabled so that multiple LAN clients could receive the client, gateway, and DNS IP addresses via DHCP while the Ubiquiti received a single WAN IP address from Spark.  The web credential authentication process can be done from a LAN client with a browser or the MAC clone feature of the Ubiquiti devices used to copy the MAC address of an already authenticated mobile device.</p> <p>The resulting performance was excellent.  The WiFi over-the-air speed was 65Mbps while the measured Internet throughput was about 20Mbps down and 10Mbps up.  The round trip ping stability in milliseconds from the ZL4DMR DMR STSP repeater working throught the TARDIS is shown in this graph captured from the ZL-TRBO DMR network bridge, horizontal axis divisions are hours.</p> <p><img alt="" src="/files/rount%20trip_0.jpg" /></p> <p>Special thanks to Jeff ZL2JG, Jeff ZL4JS, and Steve ZL2KG for their practical help with this project.</p> <p>- John, ZL4JY</p> </div> Mon, 06 Apr 2015 17:15:54 +0000 ZL4JY 466 at https://vhf.nz Dick Greenbank, ZL2TGQ. 1943-08-21 to 2015-01-08 https://vhf.nz/zl2tgq <span class="field field--name-title field--type-string field--label-hidden">Dick Greenbank, ZL2TGQ. 1943-08-21 to 2015-01-08</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/6" typeof="schema:Person" property="schema:name" datatype="">SK-ZL2TGQ</span></span> <span class="field field--name-created field--type-created field--label-hidden">Thu, 02/19/2015 - 00:27</span> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p><img alt="Dick Greenbank ZL2TGQ" src="/files/images/large_ZL2TGQ.jpg" />Dick was educated at Stratford Technical High School, Taranaki, then joined the Royal New Zealand Air Force at Blenheim as a Boy Entrant. Later after two years study at the RNZAF Electrical and Wireless School, Wigram, Christchurch, coupled with service at Defence Main Signal Centre, Wellington, he graduated RNZAF Communications Fitter. In addition he sat several civilian exams and gained First-Class Certificate in Radiotechnology, Radio Technicians Certificate, Registration as a Radio Serviceman, and Registration as a Radio-Electronics Serviceman.</p> <p>He continued study by correspondence toward NZ Certificate in Engineering but this lapsed with the growth in other interests, including the fun and antics of a group of young radio amateurs. This informal gang later formed the Wellington VHF Group. He was licensed ZL2TGQ on 15 July 1966. He was fond of relating the story of his first contact, which was made from the Defence radio station in Messines Road, Karori, using the ground-to- air radio equipment. The contact was with Anthony ZL2AZJ, also in Messines Road, a distance of about 400m. Definitely not VHF DX!</p> <p>After 8 years service in the RNZAF Dick joined AWA NZ Ltd and after 1 year as branch manager, Napier, he was appointed Divisional Manager for the Marine and Communications divisions, based in Wellington. In this role he led the commercial development of AWA in land mobile and ground-to-air radio communications. He joined the newly-established Wellington VHF Group on his return from Napier.</p> <p>Dick took on evening-class study in marketing at Victoria University, along with 1-year study in Introductory Japanese. At the completion of 8 years in radio and electronics with AWA, he joined ZIP Holdings as sales manager for consumer durable products. This involved marketing of high-volume appliances, kitchen-ware, and solar heating. Later he made the move to join Progeni Systems, N.Z.’s original own computer company as Marketing Manager. Two highlights were as Director of Polycorp, the company responsible for Poly, New Zealand’s own schools computer, and Progeni International, developing the market overseas for computer-based training software.</p> <p>Later, Dick and Dianne owned two private companies for a number of years, involving the development and sales of training and educational software, and the distribution and engineering of touchscreen systems.</p> <p>Dick was a member of the Newlands Progressive Association for some years, and served on the Board of Governors, and later the Board of Trustees, (after the introduction of “Tomorrows Schools”, of Newlands College for 7 years.</p> <p>Dick has held many elected (and co-opted) positions within the VHF Group, including:</p> <ul> <li>Committee member 2001-2002</li> <li>Secretary 2002 — 2007</li> <li>President May 2009 to October 2010</li> </ul> <p>His leadership, managerial and inter-personal skills and drive have resulted in many successful projects:</p> <ul> <li><a href="http://www.vhf.org.nz/NationalSystemAward">Creator/designer of the National System Award (NSA).</a></li> <li>Management of NSA 2002, 2004, and 2009.</li> <li>Instigator/leader &amp; Project Manager for the Taupo National System repeater station at Maroanui. (Joint effort with Taupo Branch)</li> <li>Instigator/leader of the Ngaio Reservoir 955 repeater project</li> <li>Instigator of the $10k donation support for KiwiSAT</li> <li>Active in the creation of our Digital Amateur TV strategy and standards</li> <li>Managed the DATV component purchase</li> <li>Active in responses to MED re, 806-960MHz band re-planning, scoping study on Digital Dividend</li> <li>Organiser of 2005 and 2007 VHF Conventions</li> <li>Sponsor of several VHF Conventions</li> <li><a href="http://www.vhf.org.nz/publicserviceevents">Active in public service events, organiser of Bike-the-Trail 2010, 2011, 2012, 2013</a></li> <li>Lead the design &amp; re-built the Group web-site after the move to the content management system (CMS)</li> <li>Frequent contributor of policy and technical articles to Q-Bit</li> <li>Technical, managerial and operational support behind many other projects not mentioned here.</li> </ul> <p>In recognition of meritorious service to Amateur Radio and to the Wellington VHF Group, Dick was elected Life Member in October 2010.</p> <p>In late 2010 amateur radio occupancy at Kordia sites was under threat. This would affect individual branch repeaters as well as the National System. Kordia proposed increased co-location fees that were beyond the means of NZART. Council failed to provide a positive solution and the matter was referred to individual owners to make the best arrangements with Kordia that they could, if any were possible. The then current co-location arrangements with Kordia were due to expire in June 2011.</p> <p>In an attempt to solve this dilemma, Dick, along with repeater trustees and other interested Amateurs, led the formation of the Amateur Repeater Trustees Association (ARTANZ). This association was incorporated on 22 November 2010.</p> <p>ARTANZ set to work and developed a sponsorship proposal that was submitted to Kordia in April 2011. The support information featured strongly the social contribution by amateur radio people. The outcome was that an agreement was reached with Kordia for free co-location at 12 Kordia sites, for a new duration of 5 years. Kordia recorded the work done by ARTANZ in achieving the agreement by including a clause in the agreement stating that the agreement was “based on the proposal from ARTANZ 4 April 2011”. This current 5-year agreement is due to expire in June 2016.</p> </div> <div class="field field--name-taxonomy-vocabulary-1 field--type-entity-reference field--label-above field--entity-reference-target-type-taxonomy-term clearfix"> <div class="field__label">WVHFG Categories</div> <div class="field__items"> <div class="field__item"><a href="/categories/articles" hreflang="en">Articles</a></div> </div> </div> Wed, 18 Feb 2015 11:27:14 +0000 SK-ZL2TGQ 462 at https://vhf.nz Duplexer Overhaul for 7075 https://vhf.nz/node/456 <span property="dc:title" class="field field--name-title field--type-string field--label-hidden">Duplexer Overhaul for 7075</span> <span rel="sioc:has_creator" class="field field--name-uid field--type-entity-reference field--label-hidden"><a title="View user profile." href="/user/8" lang="" about="/user/8" typeof="schema:Person" property="schema:name" datatype="" class="username">ZL4JY</a></span> <span property="dc:date dc:created" datatype="xsd:dateTime" class="field field--name-created field--type-created field--label-hidden">Sat, 11/22/2014 - 21:12</span> <div class="field field--name-taxonomy-vocabulary-1 field--type-entity-reference field--label-above field--entity-reference-target-type-taxonomy-term clearfix"> <div class="field__label">WVHFG Categories</div> <div class="field__items"> <div class="field__item"><a href="/categories/articles" hreflang="en">Articles</a></div> <div class="field__item"><a href="/categories/news" hreflang="en">News</a></div> </div> </div> <div property="content:encoded" class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>For more than 25 years, first analog then P25, the 147.075 MHz (+600 kHz split) repeater has covered the north of Wellington, New Zealand.  The original machine was a home made crystal controlled 10W design by Peter ZL2ARW but the site now features a 100W capable Motorola Quantar.</p> <p>With the increase in usage due to the growing interest in P25, the migration from the prototype P25 network based around an AstroTAC comparator in Hawaii, to the new system known as Quantar Site Connect linking Australia, Germany, and the USA to NZ, the shortcomings of the old Wacom WP 639 duplexer have become apparent.  Poor receive sensitivity being the main complaint partly due to the temporary antenna in use and partly to increased duplexer insertion loss combined with lack of isolation.</p> <p>Recently the old duplexer was pulled and a refurbishment session was held, attending were Peter ZL3TC, Ray ZL2RAY, Jeff ZL2JG, and John ZL4JY.  At the same time another couple of duplexers appeared out of ZL4JY's secret stock for cleaning and evaluation, with the intention of choosing the best performing duplexer for 7075.  Of the candidates the pale blue (WP639) and yellow (DB4060) duplexers were completely stripped and cleaned.  The DB4060 was kindly donated by Mike ZL1BTB many years ago.  The and low pass tuning rod assemblies were swapped so that the rods would be moved from their previous settings so that the finger stock would sit on different part of the inner rod.  The high - low side swap fortunately gave slightly more exposed thread on one of the invar threaded rods that had been broken on the WP639 at some point in the past while a fractured UHF T piece was found and replaced.</p> <p><img alt="WP639" src="/files/WP639%20%28Small%29.JPG" /></p> <p><em>Original WP639</em></p> <p>The black duplexer is a WP629, designed for the 118 to 144 MHz band.  In most respects it is identical the WP639 and the original datasheet is here:<br /><a href="http://www.repeater-builder.com/wacom/wp639.pdf">http://www.repeater-builder.com/wacom/wp639.pdf</a></p> <p>Both use 125mm (5") cavities, 725mm (29") long for the low band unit and 625mm (25") long for the high band.  The reject frequency adjustment stubs are the same length on the outside but the inner section is about 50mm (2") shorter on the high frequency unit.  Lastly the RG-214 (Wacom 'modified' RG214) sections are 25mm (1") shorter for the higher band.</p> <p><img alt="" src="/files/WP639%20tuning%20rods%20%28Small%29.JPG" /></p> <p>To tune the WP629 to 2m the RG214 sections were swapped for the shorter length.</p> <p>After cleaning the WP629 and WP639 duplexers returned typically 1.5 to 1.8 dB pass insertion loss and typically 75 dB notches.  The pale blue WP639 was slightly better in terms of insertion loss than the black WP629 (0.1 to 0.2 dB) and had silver plated tuning rods compared to plain copper on the WP629.</p> <p>All tuning was done using an Agilent E5701A vector network analyser. </p> <p><img alt="WP629" src="/files/WP629%20%28Small%29.JPG" /></p> <p>But the winner on the day after cleaning was the yellow DB4060 duplexer with the larger cavities, 6 dB deeper notches, and 0.2 dB less insertion loss due to the larger 200mm (8") cavities:</p> <p><img alt="Ray and DP4062" src="/files/Ray%20and%20DP4062%20%28Small%29.JPG" /></p> <p><em>Ray starts work on the DB4060</em></p> <p><img alt="Inside the DP4062" src="/files/Inside%20DP4062%20%28Small%29.JPG" /></p> <p><em>Close up of the DB4060 tuning plunger</em></p> <p>Further details on this device can be found here:</p> <p><a href="http://www.dbspectra.com/specifications/DB4060.pdf">http://www.dbspectra.com/specifications/DB4060.pdf</a></p> <p><a href="http://repeater.n1bug.com/duplexerrefurb.shtml">http://repeater.n1bug.com/duplexerrefurb.shtml</a></p> <p>The article by N1BUG was very helpful, we removed all the old lubricant from the DB4060 and it was not replaced.  It was easier to hacksaw the knobs from the threaded rod and then slot the rods for screwdriver tuning rather than replace the knobs.</p> <p><img alt="" src="/files/Duplexer%20rack%20%28Small%29.JPG" /></p> <p><em>Duplexer rack with new DB4060 in place</em></p> <p>Next major work item at the site will be the rigging of the the new VHF and UHF antennas.</p> <p>- John, ZL4JY</p> </div> Sat, 22 Nov 2014 08:12:04 +0000 ZL4JY 456 at https://vhf.nz Digital Television tests - Bulletin No 10 https://vhf.nz/node/443 <span class="field field--name-title field--type-string field--label-hidden">Digital Television tests - Bulletin No 10</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/6" typeof="schema:Person" property="schema:name" datatype="">SK-ZL2TGQ</span></span> <span class="field field--name-created field--type-created field--label-hidden">Mon, 04/14/2014 - 11:21</span> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>Members of the DATV Project Team recently met with representatives of several Government agencies to<br /> discuss the final series of adjacent-channel spectrum compatibility tests.</p> <p>Following the extensive series of field tests that have been carried out, and laboratory simulations using an output filter<br /> consisting of a 6-pole cross-coupled bandpass filter plus a 6-notch filter, we expect a successful<br /> outcome from the tests.</p> <p>We are grateful to one of our corporate sponsors for the bandpass filter, and also to our member Steve ZL2ASF,<br /> for the notch filter.</p> <p>The baseband of the test transmission will consist of a pseudo-random bit-stream, as specified<br /> in ETSI document ETS 300 744.</p> </div> <div class="field field--name-taxonomy-vocabulary-1 field--type-entity-reference field--label-above field--entity-reference-target-type-taxonomy-term clearfix"> <div class="field__label">WVHFG Categories</div> <div class="field__items"> <div class="field__item"><a href="/categories/articles" hreflang="en">Articles</a></div> <div class="field__item"><a href="/categories/news" hreflang="en">News</a></div> <div class="field__item"><a href="/categories/projects" hreflang="en">Projects</a></div> </div> </div> Sun, 13 Apr 2014 23:21:50 +0000 SK-ZL2TGQ 443 at https://vhf.nz Digital Television Tests – Bulletin No 9 https://vhf.nz/node/418 <span class="field field--name-title field--type-string field--label-hidden">Digital Television Tests – Bulletin No 9</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/6" typeof="schema:Person" property="schema:name" datatype="">SK-ZL2TGQ</span></span> <span class="field field--name-created field--type-created field--label-hidden">Fri, 08/23/2013 - 08:59</span> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"></div> <div class="field field--name-taxonomy-vocabulary-1 field--type-entity-reference field--label-above field--entity-reference-target-type-taxonomy-term clearfix"> <div class="field__label">WVHFG Categories</div> <div class="field__items"> <div class="field__item"><a href="/categories/projects" hreflang="en">Projects</a></div> <div class="field__item"><a href="/categories/articles" hreflang="en">Articles</a></div> <div class="field__item"><a href="/categories/news" hreflang="en">News</a></div> </div> </div> Thu, 22 Aug 2013 20:59:18 +0000 SK-ZL2TGQ 418 at https://vhf.nz Digital Television Tests – Bulletin No.8 https://vhf.nz/node/407 <span class="field field--name-title field--type-string field--label-hidden">Digital Television Tests – Bulletin No.8</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/6" typeof="schema:Person" property="schema:name" datatype="">SK-ZL2TGQ</span></span> <span class="field field--name-created field--type-created field--label-hidden">Tue, 04/02/2013 - 14:49</span> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>The unmodulated CW carrier on 506 MHz has been turned off, on the completion of coverage testing. Our thanks go to everyone who provided a reception report.</p> <p>A prototype 2-way splitter, being one third of the 4-way drive splitter, has successfully passed all tests. A similar prototype, a 2-way combiner designed for higher power operation, is now under construction.</p> </div> <div class="field field--name-taxonomy-vocabulary-1 field--type-entity-reference field--label-above field--entity-reference-target-type-taxonomy-term clearfix"> <div class="field__label">WVHFG Categories</div> <div class="field__items"> <div class="field__item"><a href="/categories/projects" hreflang="en">Projects</a></div> <div class="field__item"><a href="/categories/articles" hreflang="en">Articles</a></div> <div class="field__item"><a href="/categories/news" hreflang="en">News</a></div> </div> </div> Tue, 02 Apr 2013 01:49:44 +0000 SK-ZL2TGQ 407 at https://vhf.nz