7

Fun setup! I have many of the same components and need to try them out myself, but here's a general outline. (Plenty of this may be review for you, but I'm including it for others who may not be as familiar with your equipment.) The antenna A miniwhip (see also this article and this PDF) is an active antenna taken to the extreme: it uses a tiny conductor ...


6

A quadrature mixer contains two signal paths, I and Q. For a sinusoidal input into the mixer, the outputs will be in quadrature. It's this property that allows a quadrature mixer to distinguish between frequencies above and below the LO. Discarding one of the I or Q components still works as a mixer, but input frequencies above and below the LO become ...


5

Yes. You're looking for a transverter that will take RF from one source (your radio) and treat it as if it were an IF stage into another system. Here is an example. Obviously, you'll need to take care that you have operating privileges at the output of the transverter, including making sure spurious emissions are appropriately suppressed, etc.


4

IQ imbalance causes a spur at the mirror image frequency:-( If your LO is at 7.050 MHz a signal at 7.040 MHz will show up as an image spur at 7.060 MHz and a signal at 7.060 MHz will show up as a spur at 7.040 MHz. IQ imbalance is caused by various imperfections in the hardware. I and Q are obtained from mixing the input RF signal with two versions of a LO ...


2

Both systems work. One problem with the common connection is that, if you screw up your transmit switching somehow, there is the potential to send your transceiver's Tx output into the transverter's Rx output, and that might fry something. (But probably not if the levels are really low.) There's probably also an extra relay in the circuit that could slow ...


2

You don't usually produce microwave frequencies using frequency-doubling diodes (or any other nonlinear component) like that, that's why you can't find an "easy" circuit to do that. Anyways, sure, any sufficiently robust semiconductor (all of which have nonlinear I/O curves) can do that. I'd frankly just go to e.g. mouser.com click through the ...


1

You won't be able to, basically you'd have to redesign the whole radio. For example even if you somehow increased the frequency, there would be filters that follow that would cut down the signal. Everything is tuned and matched for a certain frequency range. There are other options but not for the Baofeng.


1

As I understand it, I need to set the "shift" setting under the "Radio" tab in SDRSharp to -120 MHz, which is -120,000,000. Is this the only setting that I need to change in SDRSharp? I'm not familiar with SDR# in particular, but it makes sense that that would be the only setting you need to change. If you don't change that setting, it doesn't mean ...


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