Tuesday, 19 December 2017

JT65B data mode receiving GB3VHF beacon

I am using SDR console and a FubCube Pro+ dongle.
I am also using virtual audio cable to feed my sdr audio direct to the WSJT software

To decode the JT65B, tune the carrier to obtain a tone of 1500Hz with the receiver set to USB, and the dial frequency reading 144.4285. The JT65 will then be tuned in correctly.

Start up WSJT software, you will see 3 windows open
Take note of this DOS screen with the audio settings, note audio cable out (device 3) and Microsoft sound mapper output (device 4)


In the main screen, click on Setup and then Options, you can fill in your call sign and locator details.
But pay close attention to Audio IN and Audio Out change to 3 and 4, in this example, or where your virtual audio cable is set. When using a real radio and real cables, use the normal in and out sound card.

Next set your mode click on mode and choose JT65B

Now to start listening to the SDR click on MONITOR, you will see the last of the 3 screens below start to receive a signal, you may need to turn your volume down.

Check receive noise is not in the red (high or low) after a minute or so you should start getting the text decoded for GB3VHF and its locator JO01EH

The monitor screen above shows a nice solid line when GB3VHF is transmitting its JT65B text.
The scattered image is the CW / Morse identity.
GB3VHF does a minute of each type of signal.

You are now set up to receive JT65 and its time to start looking for moon bounce signals.

73

James M0JFP




Wednesday, 13 December 2017

Ran USA Ham radio exam last night

We ran a Technician and General session at the Chertsey volunteer centre last night.
Well done to Neil who passed both exams.

Neil has been issued KI7TAP

If you are interested in taking your FCC / USA ham radio exams please do get in contact with us
@chertseyrc or chertseyradioclub@hotmail.com

Thursday, 7 December 2017

GB17YOTA Youth on the air 6Th Staines Scouts and some satellite A0-91 contacts



Started the day with a couple of AO-91 satellites passes worked several stations you can hear our attempts here:

https://dl.dropbox.com/s/0zjd15k6qf9c9hi/New%20Recording-8.m4a?dl=0

https://dl.dropbox.com/s/i87eu3bmur92qq8/New%20Recording-10.m4a?dl=0

Some CW thanks to Echelford ARS

14.17 GM0BZS 53 Rx / 57 Tx 7.180 MHz
14.23 MM0MOB (?) 41 Rx 7.180 signal lost before full confirmation

AO-91 First pass:
F1RHS
UR3CTB
F6HRO

AO-91 Second pass
MU0FAL
M0NMP
UR3CTB








Sunday, 19 November 2017

Friday, 17 November 2017

Back to Scouts on Friday to finish off the Communicators badges



We did Morse code and Phonetics, we also looked at various countries call signs, how radio's worked an some Q-Codes.  Laptop was used to allow the Scouts to listen via WEBSDR to various stations and log their 25 contacts.


Simple Morse code buzzer made from a micro switch, buzzer and battery, cased in tobacco tin.
Parts available from Maplins and per typical Hams Bob M6FLT and James M0JFP built them on a Pub Table the night before.

Wednesday, 15 November 2017

Getting heard on the AMSAT ALL FOX leaderboard and seeing your data getting used



You can check your position and ensure your data has been uploaded by visiting:

http://www.amsat.org/tlm/leaderboard.php?id=0&db=FOXDB

How to go about decoding telemetry from the FOX satellite (AO-85)


Fox Telemetry Decoder

The Fox Telemetry Decoder is being released to demodulate, store and analyze telemetry data from AMSAT’s Fox series of Cube Sats. We hope that you will also upload the telemetry you receive to the AMSAT server so that it can be used by other Amateur Scientists and our research partners, whose experiments fly with the Fox satellites.
FoxTelem is experimental. We are sure it can be improved. Please provide feedback and suggestions
Fox-1 satellites include two telemetry formats:
  • Slow Speed, also called Data Under Voice (DUV) is 200 bps FSK data sent at the same time as the transponder audio. Whenever the transmitter is on, data is being sent. This happens during beacons and during live QSOs.
  • High Speed is 9600 bps FSK sent instead of the transponder. This is used for data intensive experiments such as the Virginia Tech Camera and the University of Iowa HERCI experiment. This is only active when commanded from the ground. You can recognize High Speed because it sounds like an old school computer modem.
  • FoxTelem will receive and store both formats assuming you can feed it audio that does not have the frequencies below 200 Hz filtered.  For High Speed, the audio must also extend to include the full 9600bps bandwidth of the FM signal.  For both modes this is best achieved from a Software Defined Radio or from the 9600 bps packet port of some radios.  See the user guide for more details.
You can download the software from their website: https://www.amsat.org/foxtelem-software-for-windows-mac-linux/

I used my FunCube Pro-Plus dongle, as the software will recognise it and tune it automatically.
You can opt to feed sound using a virtual cable from another SDR or radio of choice.

here are a few screen shots of what James (M0JFP) was able to get from AO-85




Tuesday, 14 November 2017

MISSION ZERO: James M0JFP helps get Raspberry Pi code sent to ISS



Chertsey radio code club has submitted: https://trinket.io/python/9e5345d5cd 
this simple piece of code displays the names of the children, displays a simple picture, displays the temperature and then another hot / cold picture.

Its heading tot he space station in December and will be run for 30 seconds in space.

Now that's fantastic!