Littmann 4000 vs 3200
- Nov 04, 2018 · “One of Flex’s newest models, the Flex-6600, includes 7th Order Contest Band Bandpass Filters and dual Analog to Digital Converters. Which means that, using this radio, one can listen on one band while transmitting on another.
- An order of magnitude improvement in transition width is demonstrated for an elliptic ﬁlter compared to an optimized transmission response for an individual thin-ﬁlm ﬁlter. Index Terms— All-pass ﬁlters, bandpass ﬁlters, dielectric res- onator ﬁlters, gratings, lattice ﬁlters, optical ﬁlters, optical wave- guide ﬁlters.
- The "mini-board" variation of the concept would place the bandpass circuitry for each channel (frequency) onto a small plug-in PCB board. Depending upon the type and order of bandpass filter used, the number of components on the mini-board may be quite small, maybe a couple capacitors, a resistor or two, an inductor, etc., having the optimal