The G4JNT Programmable Beacon Keyer
Beacon keyer
with Audio tone output. This one [KEYER5] 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
If a blank CW message is
entered, the message sent is replaced with a sequence of three tones at
frequencies of 494, 523 and 587Hz sent repeatedly at roughly 1/3 second
intervals.
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. CW message functionality and
programming is the same as the AudioKeyer
A PCB with a programmed chip
mounted is available for £25 each. You
supply and fit the rest of the components, most of which can be obtained free
of charge from the UK Microwave Group Chip bank (for members of UKuWG).
Keyer modules can be purchased fully built, (and even pre-programmed with a
message of your choice if required) for £35.
Prices are for
Contact me at this email address for
your requirements, overseas orders, pricing for bulk and special requirements etc.
IF USING PAYPAL F/F DON'T FORGET TO INCLUDE YOUR DELIVERY ADDRESS !!!!!.
These prices include an element for
donation to SCRBG to support the Bell Hill Beacons,
PREVIOUS DESIGNS
CW Beacon Keyer with on/off output
12F629 PIC based beacon module
offering CW messages, Programmable pauses, Tx/Rx control.
The module can be re-programmed over an RS232 link so a PIC programmer isn't
needed to alter the message data.
User
Manual for standard and analogue input versions
New QRSS (SlowCW) Option now available PIC Code for both is included within the archive
Beacon Keyer with Analogue Input
Using a 12F675 PIC with
internal A/D converter. A voltage in the range 0 - 5V is measured and can be
sent back in the CW message in a number of different formats offering
user-defined accuracies and complexity. The reading can be embedded anywhere
within the CW message and can be sent at any speed.
Use, for example, to allow a beacon to transmit its own measured RF power as a
user confidence check.
Full
Archive Of User Manual (standard and analogue versions) and Programming
instructions - with PIC Code Circuit diagram and PCB for DIYers
This module or its PCB is no
longer supplied, but the audio keyer hardware above can be programmed to do the
same as this beacon keyer, and has a few enhancements (like selection of either
polarity serial lead for programming). The DirectKeyer option. See appendix A of Beacon keyer
with Audio tone output. Contact the email shown
for details.
Time Stamped Message Keyer
A completely new beacon keyer using a 16F628A PIC, has the same functionality
as the standard keyer but also generates a cryptologically
secure time-stamp. This is appended to the message as a three character triad,
a pronounceable 'pseudo word', so that listeners will be able to prove they
heard the signal at a particular point in time. A sort of Electronic QSL
Full details of the Time Stamp
Algorithm. BeaconTimeStamp.pdf
Module description. KeyerTimecode.pdf
Support Software and PIC code for DIY builders. TmStmpCode.zip