Little people invading?

Seen a lot of radio stuff with 433Mhz written on it recently. I have a clock with temperature display and a remote transducer with the said mark. So I got my uv-3r out and had a scan around and found it’s burp on 433.920Mhz but if I go up 5khz and open squelch I get an almost constant stream of chirps and burps. Further investigation found http://en.wikipedia.org/wiki/LPD433 , http://en.wikipedia.org/wiki/Low-power_communication_device  and http://en.wikipedia.org/wiki/Remote_keyless_system. Low and behold my car keys give out a buzz near there.

As well as that we have http://ukhas.org.uk/general:beginners_guide_to_high_altitude_ballooning doing some cool stuff on 434.075Mhz, http://ukhas.org.uk/guides:tracking_guide. They have their own protocol http://ukhas.org.uk/communication:protocol looks simpler than APRS and works ok, this is the sort of thing we could all be doing if not for http://licensing.ofcom.org.uk/binaries/spectrum/amateur-radio/guidance-for-licensees/samplelicence07.pdf section 9(3)

9(3) Without prejudice to Clause 1 of this Licence, the Licensee shall not establish or use the Radio Equipment in any Aircraft or other Airborne Vehicle.

We could make use of this simpler protocol on HF? For direction finding as that is the only way we can beacon other than 144.800Mhz without NOV (notice of variation)

I also noticed we were turfed out of parts of 70cm for the Olympics. 70cm is a nice big band in a prime part of the spectrum and we have it on a secondary basis, if we don’t use it others have the right to do so.

If you a Foundation Licence see table A in the licence, it’s your highest and biggest apart from 10Ghz. So cherish it.

Balloons in uk?

http://ukhas.org.uk/
they are using a FSK signal on licence free 434.075Mhz in 70cm Amateur radio band, but you can't put an Amateur transmitter in one. not sure why we are limited in this way?

could you hang a becone or video transmitter under a tethered baloon or kite as http://ukhas.org.uk/communication:licence_exempt states

Video: 2.400 – 2.4835 GHz 10 mW EIRP (Effective Isotropic Radiated Power) 20 MHz Bandwidth

can be used?

lots of cool stuff and you can view live on google maps at http://spacenear.us/tracker/

PCB-guide

I design PCB's for a living but I still like to learn, check out this site-
http://www.frontdoor.biz/HowToPCB/HowToPCB.html
as people always ask how you start.
15years in electronics in my case.

Where should I get on……?

This is a big question for Radio Ham’s looking at a new band or home. Being new to HF TX short wave listening I’m an old hand at but that was at a different QTH. I looked on the web to help me with this question. I discovered http://www.voacap.com/coverage.html , I think was written originally as a tool for VOA (Voice Of America) a broadcast station. But this online tool can give you some idea of your HF coverage although the map is a little small. Give it a go it’s free.

Going for a more detailed option there is http://www.cplus.org/rmw/rmonline.html an online version of the radio mobile package by ve2dbe see here http://www.cplus.org/rmw/english1.html . For the online version you will need a login and a good read of the documentation but it can give you an idea of good portable sites and links to your best buddy at the radio club.

Got a screen shot of the 2M range from my favourite site Billy in Llantrisant.

so I missed the date

it was in 2011 but amazing any way!

http://www.trackuino.org/

http://www.trackuino.org/
had to post when I found and you can follow real time on the map.
http://aprs.fi/?call=K6RPT-11
a balloon on a mission.
build your own from http://code.google.com/p/trackuino/

UV-3R trick!

If you want to use it as a scanner and are worried you may touch the TX button on a frequency you are not licenced for. The trick is to set the repeater shift to 39.99Mhz on vhf or 69.99Mhz on uhf and the software will stop you transmitting outside the band.( 136-174 MHz and 400-470 MHz)

Also the volume button opens the squelch if you hold it down. Seen this one here http://www.uv3r.com/images/UV_3R_CheatSheet.pdf

they sell them at http://www.uv3r.com/Index.html not where I got mine, so can’t vouch for them.

seen some very brightly coloured ones on e-bay as well.
by the way I set this up on the VFO's for UHF and VHF and got in a real knot when I had to QSY from my stored repeater channel.

pipes callcq map

http://pipes.yahoo.com/pipes/pipe.run?_id=8f305e9fb12845891d03f3cf366454e2
some reason it gives me an odd loaction?

spot of DIY

one of those things we all need now and again.
http://vk5ajl.com/projects/SWRMeter.php
knowing the principals full well from my days in a radio job, so I had a go.
work you know but with one error swap names of FWR and REV meeasure port.
to this:

With matched terminations on the output ports,

1. A portion of the wave traveling from port 1 (input) to port 4 (output) is

coupled to port 3 (forward coupled), but not to port 2.

2. A portion of the reflected wave traveling from port 4 to port 1 is coupled

to port 2, but not port 3.

3. A portion of the wave incident on port 2 to port 3 is coupled to port 4, but

not port 1; and a portion of the wave incident on port 3 is coupled to port 1, but not

port 4.

 

thought I had a total miss-match with 50R load but did a few tests and googleing and got it right.

The reflected voltage is r times the incident voltage.  Since power is proportional to the square of the voltage, the reflected power, Prefl is (5/7)2 x 4 W = 2.04 W

and the power to the antenna = 4 W  - Prefl = 1.96 W

when I work out how to add gerber plot files I will

and a picture of my work.

how to get your own QrCode badge.
use http://imagecharteditor.appspot.com/ and copy paste away
and

Bob's your aunties cat??
works with Zebra apps J2ME
see more at https://developers.google.com/chart/image/docs/making_charts
graphs charts so on.