The Bell Hill Microwave Beacons
70MHz Telemetry Beacon sending PSK31
1296MHz Experimental beacon With I/Q Upconverter and low frequency DDS with quadrature outputs
New Direct Upconversion data mode modulator for GB3SCS
Using the weak signal WSJT modes on Beacons
PIC code, coding details, modulation techniqes, keyer designs
An Overview of MGM sources used on beacons and what changes will be needed for
new generations WSJT modes that use Gaussian shaped frequency shift modulation
Self Contained Beacon Driver with integral GPS receiver and Fractional-N
synthesizer. Includes an optional driver amplifer for V/UHF.
Dual Function 503kHz beacon Runs 24/7 from G4JNT QTH
The Next Generation of Amateur Beacons for the 21st centuary
How we can use modern technology to make beacons more useful, add versatility and ease
the approval / licensing issues.
Powerpont presentation, first given at the RSGB HF Convention October 2006 .
Updated for the Flight Refuelling ARS Talk, December 2007
Adding a timestamp to beacon transmissions to allow automatic QSLing and
verification of reception.
Supporting software BCTMSTMP.ZIP
The G4JNT Programmable Beacon Keyer
Beacon keyer with Audio tone output. This one [KEYER4]
generates a pre-programmed CW message that is user-programmable via a COM port interface of either polarity and a chirp
waveform for testing and setting up links. An audio tone from a manual key input with one of eight user selectable tones
with CW keying shaped using a raised-cosine ramp for a smooth sound and no keyclicks.
AudioKeyerCode.zip Source code for the PIC 12F617 device is included so users can
customise their own version
An alternative version KEYER3 dispenses with the CW and replaces this with a sequence of three tones at
frequencies of 494, 523 and 587Hz sent repeatedly at roughly 1/3 second intervals. The manual keying tone is fixed and
the chirp has a wider bandwidth, going from 350 to 2750Hz
Another alternative, DirectKeyer replaces the CW Beacon Keyer with on/off output, but using the same PCB and PIC type.
Direct CW TTL output or, with the addition of an extra FET and a bit of board modification, On/off switching. The same CW
message functionality and programming as the AudioKeyer
PCBs and a programmed PIC are available.
If you want the non-CW version with sequential tones, or the Direct Keyer, or a mixture, please send me your requirements as a separate
email message at the time of ordering.
There doesn't appear to be any way for a message to be attached to the Paypal order :
Use the PayPal Button for UK ORDERS only
The mess with Brexit and VAT on overseas order changing make delivery overseas a bit hit-and-miss at the moment.
For all Non-Uk purchases please contact me for a price and delivery.
DTMF Remote Controller
DTMF Remote control over a telephone line.
This article was first published in Radio Communication in August 2001
Design and construction of the 5MHz beacons GB3RAL, GB3WES and GB3ORK
This article was first published in Radio Communication June/July 2005
PIC Code for driving the 5MHz beacons
GB3WES and 'ORK
Includes the code for reading NMEA data from various GPS
PCBCN - For controlling a timed personal beacon using a PC. Specifiy the timing repeat interval, offset from the hour in minutes and seconds and the Tx duration in seconds. At the right time, the DTR and RTS lines of the requested COM port will repeatedly activate a beacon transmitter for the duration.
No Bells, No whistles, just a simple timer. Stand-alone executable and VB6 Source code.
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