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> Micro control specialties 220 mhz MR4 kendecom receiver
Micro control specialties 220 mhz MR4 kendecom receiver
ARR PRE AMP / PL DECODER / RX FREQ 222.38 MHZ
* 7 large helical resonators for outstanding overload performance
* Double conversion with 21.4 MHz first IF for 120 DB image rejection
* 12-pole crystal and ceramic IF filter
* Automatic fast / slow squelch virtually eliminates squelch tail
* Squelch hysteresis follows fading signals
* Shielded oscillator / multiplier chain
* Metering circuits for signal strength, peak deviation, and discrimination
* Silver mica and mylar capacitors hold peak performance over temperature
* Provision for internal CTCSS decoder
The MR4 R is also packed with operational features like our famous MCS squelch circuit that is often called "The Best There Is." Now we have added automatic fast/slow squelch to lock in on weak signals and virtually eliminate squelch tails on strong signals. Full metering provisions for signal strength, deviation, and discrimination are included as are line and local speaker audio outputs.
Compare the MR4 specs with those of any other receiver - there is no Competition!
.25-.35 uv (typ.) for 12DB SINAD
-6DB at + 6.5KHz -105DB at + 15KHz -125DB at +25KHz
* Spurious and Image Response
-85DB Spurious -125DB Image
* Overload / De-sense 75,000 uv + 600KHz (VHF)
* Inter-modulation -80DB (EIA method)
21.4MHz first 455KHz second
8-pole crystal at 21.4MHZ 4-pole ceramic at 455KHz (optional 9-pole ceramic)
* First Oscillator Stability
+.0005% (-10 to +60C) + .0002% with optional oven
Schmitt trigger with 6DB hysteresis
.1-.15 uv, automatic switch to fast mode with signals greater than 10uV
1.5W into 4ohms (local) 0.4Vrms,1000ohms (line / repeat)
50Kohms squelch - 100ohms local audio
0-1mA, 2300ohms for each function
open collector, selectable active high or factory set active low
13VDC nominal (11-14VDC limit)
180ma squelched 200ma nominal un-squelched 250ma with full audio output
136-151MHz Fx = (Fo-21.4MHz)
2 151-174MHz Fx = (Fo-21.4MHz)
3 216-250MHz Fx = (Fo-21.4MHz)
4 420-512MHz Fx = (Fo-21.4MHz)
8 Parallel resonant, third overtone, resistance 30ohms max. 12pF load capacity, HC-25/U case
* Physical (modular version)
5" x 7.25" x 2.5" enclosure w/feed-thru capacitors & UHF connector
19" x 5.25" rack panel, 5" deep includes meters, controls, and speaker
