The ?BITX is an understandable radio and, hence, can also be a learning
experience. The complexity is kept to a minimum so you can always repair
and make changes if you so desire.
The ?BITX has a carefully thought-out operator interface. The tuning
knob features many?menu options available with a simple?push on the tuning knob.
From RIT, to dual VFOs, to the keyer, and many other features are all
accessible from the tuning knob by simply pushing on it. There are
intelligent defaults everywhere (these are easily overridden). Example :
below 10 MHz, it auto-selects LSB and vice versa. To operate CW, you
just press the morse key.
Architecture The ?BITX uses upconversion to the first
IF of 45 MHz. This eliminates the need for a large number of band pass
filters, keeping the design simple and virtually image free. The roofing
filter at 45 MHz is 15 KHz wide. The signal is then down-converted to
12 MHz where a low ripple SSB filter with 8 crystals is used to provide a
sparkling audio.
The transmitter has push-pull PA using two IRF510s for a clean output.
The low cost IRF510s are simple and inexpensive to replace should the
need ever arise.
Receiver :
Sensitivity: a 0.2uv signal is clearly audible
Selectivity: 2.4 KHz, ?low ripple SSB filter with 8 crystals
RIT (Receiver Incremental Tuning)
Continuous coverage from 500 KHz to 30 MHz
Sideband selection
Detent-less encoder tuning. Tunes with larger step rates when tuned quickly
On Mon, Mar 2, 2020 at 12:57 AM <publique@...> wrote:
Hello ! This is a very dummy question, but I can't really find the information... I would like to know what is the RX sensitivity of the ubitx ? I'm planning to use it (among other things) in my sailboat to receive weather forecast, but how good is the reception compared to a SDR (RTL-SDR, or even the more HF-oriented SDRPlay RSPDx), or to a HF transceiver from big brands ?
