HF Signals has rolled out the new (r4) version of the PCBs.
Here are the changes:
1. A new, low distortion audio amplifier made from discrete
transistors. This is one is optimized for head-phones and
connecting to PCs for digital modes. It does work with the
small speakers as well. Builders with the earlier versions can
try this audio amplifier as an outboard amplifier.
2. The audio thump issue during T/R switching has been
3. At 28 Mhz, the output is about 4 watts. (this involves a
single capacitor change from the
4. I have included some 'jump' points to add interesting
stuff like CW filters to the board. There are a large number
of test points to help you debug and understand the board.
The bad news is that we had to bump up the price of the
board by 20 dollars. We fought long and hard to keep the price
down. My personal ambition was to keep the price inside (or
at) $100. This is price rise has to do with three things : The
recent changes in the Indian import duty and sales tax; Our
own increasing costs to preorder the parts. Lastly, we also
increased our payout to those who wind the coils, assemble and
test the boards. They were working at the same rate for the
last two years. It was about time.
The new boards cost $129 USD with shipping. $139 USB with
The good news is that from now on, these boards will be
available on order. The waiting queue is gone.
On a personal note, I am happy with the new audio. It is so
much sweeter and cleaner on the headphones. Far less fatigue
after hours of CW work. I am also using the FT8 extensively, I
have bagged almost twenty countries, testing the new firmware.