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Re: Only noise when connected to the antenna #v6


 

Jonathan? KM4CFT

Mixed thoughts about this.? Your asking for support of something that is not a real uBITX so
we have no idea how close it is to the original design.? But...it is fashioned after the uBITX design
and thus might be supported here.?

The BITX and later versions of iBITX are almost modular in design.? That is not apparent unless
you understand how each section works.? I would start with the block diagram that has been
published several times on this forum.? That provides signal flow for tracing.? The voltage charts
that have also been published here could be used to troubleshoot a particular section once
you have found where the signal stops.?

Some may complain that your one-off is taking away from profitability of the HF Signals product.
Others may note that your are just proving that the overall design is repeatable, and that Farhan
has put the uBITX V.x designs into open-source or public domain so that anybody can copy it.

Arv? K7HKL
_._


On Thu, Feb 27, 2020 at 2:53 PM Jonathan Kayne, KM4CFT <jzkmath@...> wrote:
Hi all,
I recently soldered up what was basically a copy of the uBitx V6. I used the schematics and pictures of the board to essentially create a copy of the uBitx v6 in KiCad. I found a few problems during this process but I could not figure out why receive isn't working. The odd thing is that when I connect the system to an RF function generator and insert an AM signal, it comes right through. The moment I hook it up to an antenna, I get nothing but noise.
Now I know people were saying I should have done it Manhattan Style. Yes I could have but I wanted to learn RF PCB design.?
I do get the beeps when I turn the encoder, but no tone when I try to adjust frequency or BFO.

I also wanted to share a link to the project, so that maybe someone here could look over my PCB designs. perhaps I missed something. Also, I put jumpers between each section so it is a modular construction (just on a PCB)

Here is a link to my project:?
I have the KiCad files there so please take a look at it.

Wondering if there is any tests I can do to ensure signals are doing what they should? There is little to no information about how to do any real tests on the modules, so quite lost. I have access to a full RF lab with Spectrum Analyzers, frequency counters, network analyzers, etc.

Thanks,
-Jonathan Kayne, KM4CFT

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