On Fri, Feb 21, 2025 at 01:07 PM, Alan G4ZFQ wrote:
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Thank you for your reply!?
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That's what I thought, I'm assuming, there's no IF at all?
With very delicate work you might get IQ out independently but would need to be skilful and just end up with the same output as the QMX standard IQ out.
My current approach is not to get I/Q separately (although this might be a viable solution, too), but to 'tap' the analog RX signal (or IF, if available) and convert it to I/Q, using an independent SDR receiver. The I/Q mode as-is does not fit my requirements.
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I don't have a block diagram for the QMX and the receiver schematics are not an open book to me. So my question is: Is there any point in the cirquit where I can 'tap' the analog RX signal (using a buffer board in order not to draw power from that signal)?
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It's always possible to get the RX signal directly from the antenna input. That will work. However, I will have to cut that connection on TX in order not to fry my second receiver. The buffer board I intend to use, does have that ability. In that case I need a point on the circuit, where i can 'read' the RX/TX status. I will have to convert that signal to +12 V for the buffer board. Using CAT is not an option for this case, because it's to slow.
If you want a tap for the RX antenna it might be possible but to do that without affecting the QMX operation will need very careful consideration.
What you are asking has never been discussed here.
Great point to start a discussion! I would not have asked without studying the manual and searching this group first. Unfortunately I have not been able so far to get the necessary information - what, I admit, has to do with a lack of basic understanding of the inner workings of the QMX.
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Let's summarize my requirement: I'd like to have a second independent SDR-Receiver while QMX is in RX. I am very used to that feature and I don't want to miss that when working with the QMX. I will share my experience (solution?) here, I thing that might be interesting for other users, too.
