NaP3 generates no signals of its own. What you see is what you feed it.
NaP3 is a spectrum display with some rig control and two sdrs aimed at rigs with an IF or I/Q output. It can be configured just as a panoramic
display, or used with its SDRs as extra receivers, or to provide tailored rig control functions.
The source code is extensively modified PowerSDR-IF and PowerSDR (copyright Flexradio Systems Inc).
It just needs a pair of quadrature signals, or I/Q. To get these the rig IF needs downconverting to baseband audio with hardware such as the
excellent LP Pan by N8LP (www.telepostinc.com/LP-PAN.html)
and then fed to a sound card. The FUNcube Dongle Pro Plus can also be
used which can convert VHF intermediate frequencies and has a USB connection. The Elecraft KX3, with its direct I/Q output can be directly
connected to a sound card
If your I/Q (audio) input pair are close to balance you should achieve up to 30dB of image rejection. NaP3 improves on this with a Wide Band
Image rejection routine that when optimised (see DSP/WBIR section) gives ~70dB of rejection.
40m at night in Europe with thunderstorm 100km away Top: 13k wide RTTY span. Bottom:
4k wide PSK span.
NaP3 displays the result with a maximum display width determined by the card sampling rate. A 192kHz device should allow 192kHz to be
viewed. Lower sampling rates will generate smaller maximum spans but it is possible to zoom in from *any* maximum span down to 1kHz
width, at any sample rate. Narrowband modes can be studied more closely by increasing resolution with the FFT bin control.
Two sdr receivers are available but the Sub rx is an identical clone of the Main rx with its frequency determined by an offset from the Main rx
frequency. For the sub rx to function, this offset must remain within the maximum display span, which is defined by the main audio sample
rate.
The rx passband width and position set at the rig are reflected in the display, with cw pitch also taken into account.
The entire display span can be recorded for later playback and during playback the sub rx can tune around the recorded spectrum.
Sixteen macros are available, and for K3 & KX3 owners, data decoder output. NaP3 will go into sleep and wake up with the computer and it
will display at 96, 120 and 144dpi (100, 125 and 150% in MS speak, also known as Smaller, Medium and Larger. Ha!).