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Next Month in Silicon Chip LTspice - simulating and testing circuits, part 2 Next month in part two of our SPICE tutorial, held over from this issue due to space constraints, we describe how to build a basic simulation of a relay in LTspice. We then make the relay model more realistic by adding a few extra features. El Cheapo Modules, part 8: GPS modules We describe two common GPS modules, their features and how to interface them to an Arduino or Micromite. Survey of Radio Telescopes Silicon Chip has had a number of articles on radio telescopes, the most recent being on China's gigantic new telescope, in the October 2016 issue. Now Dr. David Maddison takes a look at radio telescopes around the world, from the relatively small to the extremely large which use the techniques aperture synthesis and interferometry. Using a DDS Module for AM Radio IF Alignment In this article, we present updated software and slight tweaks to the hardware of the Micromite BackPack Touchsreen DDS Signal Generator described in the April issue. These changes make it a cinch to align the IF stage of a transistor or valve-based superheretodyne AM radio. Rohde & Schwarz RTB2004 DSO Review We take a look at this latest offering from R&S which combines a 10-bit ADC and 10.1-inch capacitive touchscreen along with either two or four channels in a compact bench-top unit. Note: these features are prepared or are in preparation for publication and barring unforeseen circumstances, will be in the next issue. The August 2017 issue is due on sale in newsagents by Thursday July 27th. Expect postal delivery of subscription copies in Australia between July 27th and August 10th. Advertising Index Altronics.................................. 68-71 Dave Thompson......................... 103 Digi-Key Electronics....................... 3 Electronex.................................... 15 element14...................................... 7 Emona Instruments.................... IBC Hare & Forbes.......................... OBC Jaycar............................... IFC,49-56 Keith Rippon Kit Assembly......... 103 Laservision................................... 14 LD Electronics............................ 103 LEDsales.................................... 103 Master Instruments...................... 11 Mastercut Technologies................ 12 Microchip Technology............... 5, 39 Mouser Electronics......................... 9 Ocean Controls.............................. 8 PCB Cart................................... 13 Sesame Electronics................... 103 SC Online Shop......................... 101 SC Radio & Hobbies DVD............ 76 Silicon Chip Binders..................... 81 Silicon Chip Wallchart.................. 31 Tronixlabs................................... 103 Vintage Radio Repairs............... 103 Notes & Errata Improved Tweeter Horn for the Majestic Loudspeaker, September 2014: Fig.3 on page 89 has a misprint in theSC printed edition, which shows a distance of 377mm between the front of the lower panel of the speaker and the end of the hyperbolic horn panel. It should read 37mm instead. The online version of this article shows the correct dimension. Spring Reverberation Unit, April 2017: if using the DC supply option with CON6 (the barrel connector), it's necessary to either omit CON5 and solder a short length of wire between its two outer mounting holes (without shorting to the centre), or alternatively, fit a 3-way connector for CON5 and connect a wire link across its two outer terminals. 6GHz+ RF Prescaler project, May 2017: As published, this project does not have an output impedance of 75W; it is 300W. This can be fixed by substituting 0W resistors for the 100W resistors and 75W resistors for the 300W resistors. WARNING! SILICON CHIP magazine regularly describes projects which employ a mains power supply or produce high voltage. All such projects should be considered dangerous or even lethal if not used safely. Readers are warned that high voltage wiring should be carried out according to the instructions in the articles. When working on these projects use extreme care to ensure that you do not accidentally come into contact with mains AC voltages or high voltage DC. If you are not confident about working with projects employing mains voltages or other high voltages, you are advised not to attempt work on them. Silicon Chip Publications Pty Ltd disclaims any liability for damages should anyone be killed or injured while working on a project or circuit described in any issue of SILICON CHIP magazine. Devices or circuits described in SILICON CHIP may be covered by patents. SILICON CHIP disclaims any liability for the infringement of such patents by the manufacturing or selling of any such equipment. SILICON CHIP also disclaims any liability for projects which are used in such a way as to infringe relevant government regulations and by-laws. Advertisers are warned that they are responsible for the content of all advertisements and that they must conform to the Competition & Consumer Act 2010 or as subsequently amended and to any governmental regulations which are applicable. 104  Silicon Chip siliconchip.com.au