
Originally Posted by
Buford T. Justice
Is the V1 the most sensitive because of internal electronics or antenna horn design? My money is placed on horn design. Another words (though not possible) if I were to stick the V1 antenna design on the STi, the STi would become the "most sensitive." Most people see it as "most sensitive" as being "best depth." Most sensitive could mean above average depth detection with the best wide angle off-axis coverage. I feel the term, most sensitive, is NOT being used correctly.
If and when someone can crack into the units and officially measure the noise floor, S/N ratio, on both units by-passing the antennas, I'll consider both even.
Part of the answer is due to the horn design. Valentine holds the patent for a fast flared microwave horn with optimal wave guides. See:
US Patent 4878061: Broadband wide flare ridged microwave horn antenna
Other parts of the answer include which part of the microwave spectrum the radar horn is optimally tuned for, and how big or how flared the radar horn is. And yet still other parts of the answer concern whether the radar horn is manually tuned or electronically tuned, and whether either microwave diode or microstrip sensors are used within the radar horn. Yet other parts of the answer include how clean the reference signals are from the local oscillators and how well noise is dealt with within the shielded local oscillator circuitry. And finally, it also depends on each manufacturer's patents for particular local oscillator designs and how good the circuitry is at detecting harmonics of the local oscillators, and how good the patented digital signal processing circuits and processing algorithms are.
Jimbonzzz (the undisputed "Professor"), please jump in and verify if everything I have said is correct or if I have left anything out.
But in other words, there is a LOT more to how good a RD is than just the size and design of the radar horn itself, and it also depends on the design approach used by each manufacturer. Some may start with the local oscillator and microstrip (if used instead of diodes) electronics first and then work their way out to the final horn design based on what is desirable and upon size limitations imposed by the artistic designers who have already created the overall RD case size and appearance, whereas other manufacturers might start with the horn design first. While the horn design is important, it isn't nearly as important as it was 20 years ago when what could be done with electronics to process the received radar signals was incredibly more limited.
The STi is a completely different animal compared to the V1. The STi uses two radar horns, both of which are folded designs which prevent local oscillator signals from leaking out through the horns, making the STi completely undetectable to RDDs well into the foreseeable future. Quite frankly I am shocked that Belscort has been able to achieve the sensitivity numbers which they have, considering that the horn designs are anything but conventional.
That's my two cents worth!
Oops, I forgot to mention, the speaker on the STi features a plug at the ends of its wires rather than the speaker's wires being soldered directly to the circuit board as on the V9XX and RX-XX models. I guess that Bel finally has figured out that the speakers do indeed blow prematurely due to poor quality control in China?
Best regards to all,
--Michael
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