But I think that SDRs that digitize at the VFO frequency itself (I believe
this is generally called "direct sampling" on RX and "direct digital
synthesis" on TX?) can get away with a single channel, since there's no
mixer to cause the "you mix A and B and get both A + B and A - B even
though you
Mike,
I think you're right that SDRs that digitize at a zero IF (like the KX3)
need I and Q channels to distinguish the AF sidebands. That is, if the
radio mixes 7030.4 kHz down to a sidetone of 0.4 kHz, it also catches
signals at 7029.6 kHz.
And I think that SDRs that digitize at a non-zero and
Jerome,
This answer is for generic SDRs, since I don't have a KX3.
An SDR always must use both I and Q, even for CW. I and Q are two
streams of samples of the same signal. One of many advantages to i/q
sampling is the ADC's can run slower (cheaper). In the extreme and
ignoring the
On receive, if you only mix the RF signal with only the I phase of the VFO,
you receive both sidebands, and you can't observe them separately. On
transmit, you have the same problem in reverse -- you transmit both
sidebands, and you can't control them separately.
For modes with a single sideband
Hello,
Although I have asked some of these questions on another forum, here I have
expanded on them a bit.
When the KX3 transmits a CW-signal, are both I and Q used?
If so, why would that be necessary?
(My guess is only the I is needed.)
Same questions too for a SSB-signal.
But, for any
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