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

Beacon Keyer Module Beacon Timestamp
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. 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

5MHz Beacons
Design and construction of the 5MHz beacons GB3RAL, GB3WES and GB3ORK
This article was first published in Radio Communication June/July 2005

HFBCN02.ASM PIC Code for driving the 5MHz beacons GB3WES and 'ORK
Includes the code for reading NMEA data from various GPS modules.

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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