Cw 100r updating
It is also a good idea to fit two antiparallel diodes (like 1N4148) at position of D4 to prevent preamp input from overvoltage.
There are some discussions about IM3 problems using antiparallel diodes.
An assembly of these two components would only weaken the sensitivity of the receiver.
The two pins of P6 could be extended with a few centimeters of wire and mounted in the housing so that later on you could easily reprogram the bootloader without having to disassemble half of the machine. Those who had already performed this mod, remove the wires, please.
PIN diode switching often produces spurious TX signals and distorted TX signals.
As a result, the quiescent current consumption in "off" mode has now fallen to less than 1u A. ) The following changes are necessary: Here are the required pictures If you have old UI board (rev.But we do have more than a few destroyed BFR93A in our German Project group at mc HFs where antiparallel diodes are left out. There is a design error in the SWR measuring bridge.