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So, for the time it takes the hardware to figure out what
frequency you are at you maybe out of compliance until the filter
On 8/13/2018 1:17 AM, Tom, wb6b wrote:
I wan't to build a filter I can use with the uBITX. However, I
don't want to build a filter that is strictly tied to the uBITX.
So I'm building a standalone Low Pass Filter box that will work as
an add on filter for the uBITX as well as become a general purpose
piece of Ham equipment I can use over and over for other needs.
It uses an Arduino to measure the frequency you're transmitting on
and select any individual or combination of filters you like. The
proposed design uses a set of filters and a relay switch board;
such as to ones by QRP Labs. But, the Sketch code should be easy
enough to modify for whatever you like.
The controller can show he selected filter with LEDs or with an
optional LCD display, and show the transmit frequency as well.
I'll need to order parts and build mine to finalize the design.
However, I built and tested a prototype with a signal generator.
I'm releasing the preliminary design to everyone now because it is
complete enough for people to try out on their own filter designs.
It makes using outboard filters really easy, and I think people
will like it. I welcome feedback on improvements people make while
building their own "Auto Filters" with the controller.
The code for the controller is here: https://github.com/mountaintom/TX_Auto_Filter