I have been updating the VLNA preamplifier design with a
new PCB. Although it looks very similar to the original
VLNA23, which was later extended to cover 70cm, 13cm and
9cm (and a number of bands of interest in between) the new
PCB was designed just to cover 1240MHz to 1325MHz
(23cm) and 2300MHz to 2400MHz (13cm).
Among the changes, the gain at 23cm has been reduced
slightly, to aid stability and therefore to reduce the
need for some of the expensive RF absorber material.
The PCB solder resist is purple in order to readily
distinguish the new board from the previous versions. Also
it now uses 0805 size SMD components instead of 0603 (with
a couple of exceptions)
The new board is still under development, with a number of
first spin (VLNA C) boards already in use. User feedback
from these has led to some further, small changes, which
are going through evaluation at present (end of August).
I do not intend to produce kits or complete units, but
Gerbers and comprehensive component listing will be
available available, maybe on Github. For those who do not
wish to get boards made, I will have a very limited number
of PCBs available. The intention is to first publish the
revised VLNA in one of the amateur radio publications and
then include further instruction on here, together with
the existing designs.
My contact information is here.
This page last given TLC on the 31/08/23