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Cash in your surplus gear. Advertise it here in SILICON CHIP
WANTED
WANTED: EARLY HIFIs, AMPLIFIERS,
Speakers, Turntables, Valves, Books,
Quad, Leak, Pye, Lowther, Ortofon,
SME, Western Electric, Altec, Marantz,
McIntosh, Tannoy, Goodmans, Wharfe
dale, radio and wireless. Collector/
Hobbyist will pay cash. (07) 5471 1062.
johnmurt<at>highprofile.com.au
ELECTRONIC & LED Business for
Sale. Owner Going Overseas. Many
SMD Parts and LED Parts. Contact
Tony at tony<at>phoslighting.net or 61
417111500 or 86 1343556690.
KEEP YOUR COPIES OF
SILICON CHIP
AS GOOD AS THE DAY
THEY WERE BORN!
PCBs MADE, ONE OR MANY. Any
format, hobbyists welcome. Sesame
Electronics Phone 0434 781 191.
sesame<at>sesame.com.au
www.sesame.com.au
ONLY
95
$
1P6LUS
p&p
FOR SALE
LEDs, BRAND NAME and generic
LEDs. Heatsinks, fans, LED drivers,
power supplies, LED ribbon, kits,
components, hardware, EL wire. www.
ledsales.com.au
tronixlabs.com - Australia’s best value
for hobbyist and enthusiast electronics
from adafruit, DFRobot, Freetronics,
Raspberry Pi, Genuino and more, with
same-day shipping.
PCBs & Micros: SILICON CHIP Publications can supply PCBs, programmed
microcontrollers and other specialised
parts for all recent projects and some not
so recent projects. Visit our Online Shop
at www.siliconchip.com.au for details.
PCB MANUFACTURE: single to multi
layer. Bare board tested. One-offs to
any quantity. 48 hour service. Artwork
design. Excellent prices. Check out our
specials: www.ldelectronics.com.au
KIT ASSEMBLY & REPAIR
KEITH RIPPON KIT ASSEMBLY &
REPAIR:
* Australia & New Zealand;
* Small production runs.
Phone Keith 0409 662 794.
keith.rippon<at>gmail.com
VINTAGE RADIO REPAIRS: electrical mechanical fitter with 36 years ex
perience and extensive knowledge of
valve and transistor radios. Professional
and reliable repairs. All workmanship
A superb-looking
SILICON CHIP
binder will keep
your magazines in
pristine condition.
* Holds up to 14 issues
* Heavy duty vinyl
* Easy wire inserts
ORDER NOW AT
www.siliconchip.com.au/shop
guaranteed. $10 inspection fee plus
charges for parts and labour as required.
Labour fees $35 p/h. Pensioner discounts available on application. Contact
Alan on 0425 122 415 or email bigal
radioshack<at>gmail.com
DAVE THOMPSON (the Serviceman
from SILICON CHIP) is available to help
you with kit assembly, project troubleshooting, general electronics and
custom design work. No job too small.
Based in Christchurch, NZ but service
available Australia/NZ wide. Phone
NZ (+64 3) 366 6588 or email dave<at>
davethompson.co.nz
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Ask SILICON CHIP
. . . continued from page 102
that can simulate sending specific
coordinates to your mobile phone
within that cage? This would allow
me to go to any location to find Pokemons. Failing that do you know of any
smart phones that allow you to write
(hack) coordinates directly to the GPS
receiver chip? (O. W., via email.)
• We think your proposition would
siliconchip.com.au
be exceedingly difficult. As you may
know, a GPS receiver computes its
position and therefore its coordinates
after receiving the time and position
signals from a constellation of satellites. It needs to receive signal from
at least three satellites to compute its
2-dimensional position and at least
four to compute is 3D position (ie,
including altitude).
Most modern receivers even look
at the relative phase of the received
signals for more precise positioning.
There are lots of websites which give
a good explanation of how the Global
Positioning System (GPS) works.
So to trick the GPS receiver in the
way you suggest, you would need a
generator which could produce four
separate time and position signals.
And then of course, you would need
the phone and its “trick GPS signal
generator” to be in a Faraday cage. Just
as an aside, a microwave oven would
be ideal for this task – just make sure
. . . continued on page 104
October 2016 103
