QRPGuys Pacificon KD1JV, Руководство пользователя

Страница: 1 / 19

Page 1 of 19 pacificon_assy_041621.pdf
The KD1JV Pacificon
A DSB/CW transceiver for 40 meters.
Featuring: Wide tuning range digital VFO with 5 digit LED readout.
Direct Conversion receiver
~5 watt CW/PEP transmitter
The CalQRP club wanted a simple transceiver with voice capability for a Pacificon build-a-thon. The
goal was to have a QSO party using the project at the end of the build-a-thon.
The other two design goals were low cost, reasonably simple design and hopefully most can build
it in under two hours. DSB was chosen since it's a lot simpler to implement then a SSB transceiver
and is somewhat more effective than AM.
Conventional wisdom says two DSB stations can't talk to each other if both use a Direct
Conversion receiver. This is not true.
What is true is that the two stations need to match each other's frequency exactly. Or at least
really close. As the center frequency of one or the other (or both) stations start to drift apart, the
beat note of each side band starts to separate, with annoying results.
The problem with minimalist DSB designs is that they often used an Analog VFO of questionable
stability. So, keeping two home brew DSB stations on the same frequency was frustrating, hence
the bad rap.
By using the inexpensive Si5351 clock chip for the VFO and the various additional functions a
microprocessor adds, The Pacificon becomes a practical DSB rig.
The firmware is written with the Arduino IDE. The MEGA328P processor comes with the bootloader
installed, making it compatible with the UNO board for reprogramming. The Arduino sketch is
available to tinker with.
A Baofeng UV3R, (not UV3R+), single plug microphone is required for voice operation. These are
available on ebay for $5 to $10 depending on who you buy from and how long you want to wait
for it.