Friday, 21 July 2017

Chertsey Radio Club Summer Raffle

Draw will be held on August 31st 2017


Chertsey Radio club is holding its summer raffle with a couple of great prizes to give away.

Retevis have kindly sponsored us with a RT-82 Dual band radio and programming cable

The RSGB have also kindly donated a couple of books as prizes

We also have a years subscription to AMSAT-UK up for grabs (Donated by Chertsey radio Club)

Money raised will help purchase a simple Business UK license for National Autistic society, following on from Project Thomas, see this link , we can now make this a UK wide project and support People on the Autistic Spectrum, by allowing them to use radios as a form of communication, monitoring and helping them gain some independence.

All other Money will be donated to Cancer research UK for the fantastic work they do and the help and support several members of the club and our friends have had in the last few years.

Click on the donate button below to buy your ticket £1 **Thank you**

Thursday, 20 July 2017

ISS SSTV 00:58 UK celebrating 20 years of ARISS

Live from the shack of James Preece M0JFP
Second UK pass of ISS SSTV

Tim Peake **Hooray**

ISS SSTV (23:23 UK) 20th anniversary ARISS

Happy to report live from the shack of James Preece M0JFP, we have SSTV images decoded from the International space station again...

Wednesday, 19 July 2017

Virtual buildathon is back

Chertsey Radio Club Buildathon 2017

Diplexer for 144 & 430 Mhz

  Welcome to the Chertsey Radio Club second buildathon.  This project, though   simple, does present some constructional challenges. The kit contains mainly surface mount components (known as SMD's), which are extremely small and easily lost or incorrectly identified.  Below is a list of essential items you will need to build the kit.

A clear well lit work area
18-25w soldering iron with fine or needle tip.
60/40  Resin cored electronics solder for SMA connectors
Surface Mount Device Solder (Available Online)
Blue Tac or White Tac to fix the PCB  in place when soldering
A pair of fine tweezers to hold SMD's
A good magnifying glass or jewellers loop
Set of Helping Hands or small clamp  (when soldering SMA connector)
Multimeter to check continuity

  Surface mount solder is essential. It will be extremely difficult to build this kit without it.  It is a grey paste, usually supplied in a syringe and contains a mix of powdered 60/40 lead solder mixed with a sticky flux. The advantage of this will quickly become apparent as the SMD contact pads on the PCB are not big enough to work with solder wire. This way the solder can be applied in advance, and will only require a touch from the iron for the component to take.

 The diplexer is rated with a peak power handling of 10w.  It is ideal for use for use    with small yagi type antennas and for satellite work.  

Notice the board in the middle of the picture....
Kits ready to be shipped out

Here are the first 10 Kits ready to be shipped out.

Macro shots of the SMA connectors

Macro of the tiny inductor compared to a UK 5P coin !

Marco of the PC Board.

Another macro of the Inductor next to a UK 5 Pence coin.

Sunday, 16 July 2017

Setting up raspberry pi 3 and QSSTV latest 9.2.4 GB8SSD special update / ARISS 20 anniversary

You need an external usb sound card

Next set up alsa mixer and increase the microphone gain!

In a command line window type:
Sudo alsamixer

Press the F6 key to select sound card

Choose the usb sound card using up and down arrow keys and press enter.

Use arrow right key to select Mic, use up arrow to increase to about 52.

Press escape key to return to command line

To install QSSTV type:

sudo apt-get install g++ libfftw3-dev qt5-default libpulse-dev
sudo apt-get install hamlib-dev libasound-dev  libv4l-dev
sudo apt-get install libopenjp2-7 libopenjp2-7-dev

Next download and install QSSTV

mkdir downloads
cd downloads
tar -xvzf qsstv_9.2.4.tar.gz
cd qsstv_9.2.4
sudo make install

You can now run the program by typing qsstv at the prompt of a terminal session, or make a short cut on your desktop.

Click on configuration

Click on sound and copy the above settings
Input and output set to your usb sound card.
Set the sound to alsa.
Plug an external microphone into the sound card. Turn up your radio and watch your pictures get decoded.
Space station is 145.800 fm
However 14.230 upper side band is more regular broadcast.
You can also hold the microphone near a sstv recording or YouTube video.

Have fun let me know how you get on!