Hello Bill,

Its very unfortunate that a well intended kit that was assembled with
questionable quality parts, circuit and several other anomalies beyond
my comprehension, is in its present quandary. The principals it appears,
had good intentions and are to be commended for that. However, they have
no authority in North America. In fact the Border agencies of both our
countries are probably raising their eyebrows over the entire fiasco,
If not they soon will be. As I said earlier in my position As XO on
board ship I can’t afford to run afoul of the authorities so my bitx 40
and ubitx have been destroyed. Sad really, I will be looking at the kits
from QRP LABS. Or maybe I should purchase a good used FT817.
As an aside I had SIGINT techs look at the harmonic signature on the
Harris, Wolfsburg and Bendix King gear and found them to exceed
requirements by 30%, but of course again I’m comparing caviar to
peanuts. My wife chastises me for my attitude ergo I’m at sea for 6
months of the year. I’m trying to do better hi hi. It’s no wonder I’m
not allowed in the house before dark.

The sheer number of builders, the responses in this group, would suggest
that there is a strong need for a simple affordable all band QRP rig,
that is a fact, It will be interesting to see what happens in the next
while.

In the research I have done there are some kits available from China,
Russia and also Malaysia , they may be more in cost but perhaps ???


On a final observation you can buy all kinds of brands of test gear but
there are only certain brands that are deemed to be certification
instruments when operated by a certified knowledgeable technician, just
because you go out and buy a Rigol
doesnt mean that now you are instantly an industry expert.

Early day tomorrow, anchors aweigh at 0400

cheers and 73
WRS

Can anybody explain why I am not receiving Glenn's posts on this subject
but I am receiving the responses he receives, such as this from Colin.
Yet, if I go to the group page to view Colin's reply, I can step back
to find Glenn's post. Why should they not be appearing as emails, as
they had previously, since we moved to groups.io

Bill, VK7MX

the diode could be 1N540x a 3 amp device , as it is feared that diode
might blow faster than fuse (rule of MURPHY !!)
_._,_._,_

The filter components as designed are perfectly adequate once the relay and layout problems are addressed. Yes, there are likely improvements that can be made with optimization but they are fine as is.

I have removed the filter components from the uBitx and laid them out in a straight line on perf board. It is not pretty but that was not my intent..... I wanted to see how they perform. They perform superbly in this layout.

Photos of the board and the filter profiles are attached.

WA8TOD

My preferred solution:
    https://groups.io/g/BITX20/message/52904

The instructions for reverse polarity protecton on the uBitx WireUp page would be acceptable  
if they also showed a 3 Amp fuse in line with the +12v lead from the power supply.

 

A simple-minded solution that will likely work for the one or more that I'll be using "manually" will be a SPDT switch on the outside end of each filter.   Cut the loooong return traces, rewire existing relays as needed, tiny little perfboard off to the side to hold 3 or 4 switches (depending on how many bands I really care about) and wire the outputs with some coax back into the circuit.   Rewrite software if needed to activate desired relays after a bit of rewiring.   Done