SPECIFICATIONS FOR THE RAMSEY FX-223
General:
Frequency Range: Any 20 MHz segment between 220 and 240
MHz
Tuning: Diode-programmable PLL synthesis 12 front
panel selected frequency pairs, easily
expandable by switches, microprocessors,
computers, etc.
Programming: 5 KHz steps with programmable offsets
Transmit Offset: Programmable: Simplex, +1.6, -1.6, Aux
Mode: NBFM
Packet (Data) Operation: All rates incl. 9600 baud . 5-pin DIN jack
(TXD, RXD, PTT, +12VDC, GND)
Packet RX Audio: Speaker, discriminator or true FSK
Power Requirement: 13.6V DC +/-10% (Negative ground)
Power Consumption: 1.0 A Transmit (for 5 watts RF output) 200
ma. (Receive, no signal)
Antenna Impedance: 50 ohms
Microphone Impedance: 600 ohms or high impedance
T-R switching: PIN diodes
PTT circuit: Solid State (for standard ICOM-type
speaker/mic connection)
Semiconductors: 10 IC's, 16 transistors, 24 diodes (plus
programming diodes)
Transmitter:
Final Power Output: 3-5 watts RF
Final Output Stage: MRF237 or equivalent
Modulation: True direct FM
Max frequency deviation: +/- 25 KHz, +/- 5 KHz NBFM
Modulation distortion: Less than 5%
Receiver:
Circuitry: Double-conversion superhet
First IF: 21.4 MHz
Second IF: 455 KHz
Sensitivity: 12 db. SINAD less than 0.35 uv
Selectivity: 7 KHz (-6db.), 15 KHz (-60db.)
Squelch sensitivity: Less than 0.25 uv
Audio output: More than 2.0 watts
Circuit access points: COR, PL tone input, FSK demod. +12V,
+8V, +5V, PLL programming.
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