FM/AM-1200 S/A CAPABILITIES

FM/AM-1200 S/A CAPABILITIES

A prime feature of the FM/AM-1200S/A is the capability of testing both simplex and duplex communication equipment. Simplex operation is defined as any equipment that communicates in only one direction at a time on the same frequency, including ordinary transmit-receive or press-to-talk operation, voice operated carrier and other forms of manual or automatic switching from transmit to receive. Duplex operation is characteristic of any equipment which transmits on one frequency and receives on another frequency between two locations, such as mobile telephone systems and repeaters.

In receive mode, the FM/AM-1200S/A receiver monitors incoming signals received “off-the-air” or applied via direct cable connection through the front panel T/R Connector. In this mode, the FM/AM-1200S/A signal generator is inactive. In the generate mode, the FM/AM-1200S/A is capable of generating modulated or unmodulated carrier signals while the receiver circuits are simultaneously monitoring the generator.

In the duplex mode, the FM/AM-1200S/A has the capability of generating and receiving signals simultaneously. While the receiver section of the FM/AM-1200S/A is monitoring incoming signals transmitted by the UUT, the FM/AM-1200S/A duplex generator is simultaneously generating signals to stimulate the receiver section of the UUT. The frequency of the generated signal from the FM/AM-1200S/A can he offset up to ±49.99 MHz from the receiving frequency in 10 kHz steps. ‘Three methods of duplex testing are available using the FM/AM-1200S/A. They are:

Duplex Testing using separate Transmit/Receive Lines

Duplex Testing using one common Transmit/Receive Line “Off-the-air” Duplex testing

FM/AM-1200 S/A CAPABILITIES

A prime feature of the FM/AM-1200S/A is the capability of testing both simplex and duplex communication equipment. Simplex operation is defined as any equipment that communicates in only one direction at a time on the same frequency, including ordinary transmit-receive or press-to-talk operation, voice operated carrier and other forms of manual or automatic switching from transmit to receive. Duplex operation is characteristic of any equipment which transmits on one frequency and receives on another frequency between two locations, such as mobile telephone systems and repeaters.

In receive mode, the FM/AM-1200S/A receiver monitors incoming signals received “off-the-air” or applied via direct cable connection through the front panel T/R Connector. In this mode, the FM/AM-1200S/A signal generator is inactive. In the generate mode, the FM/AM-1200S/A is capable of generating modulated or unmodulated carrier signals while the receiver circuits are simultaneously monitoring the generator.

In the duplex mode, the FM/AM-1200S/A has the capability of generating and receiving signals simultaneously. While the receiver section of the FM/AM-1200S/A is monitoring incoming signals transmitted by the UUT, the FM/AM-1200S/A duplex generator is simultaneously generating signals to stimulate the receiver section of the UUT. The frequency of the generated signal from the FM/AM-1200S/A can he offset up to ±49.99 MHz from the receiving frequency in 10 kHz steps. ‘Three methods of duplex testing are available using the FM/AM-1200S/A. They are:

  • Duplex Testing using separate Transmit/Receive Lines
  • Duplex Testing using one common Transmit/Receive Line “Off-the-air” Duplex testing

FM/AM-1200S/A SPECIFICATIONS

RF SIGNAL GENERATOR

Frequency Range 250 kHz to 999.9999 MHz in 100 Hz increments
Frequency Accuracy ±5 Hz + Master Oscillator (S/Ns thru 4490 for FM/AM-1200S, S/Ns thru 1448 for FM/AM-1200A). See Master Oscillator for FM/AM-1200S S/N 4491 and after (S/N 1449 and after for FM/AM-1200A).
Residual FM <10 0 Hz RMS (300 Hz to 3 kHz Bandwidth)
Harmonics 2nd Harmonic <-30 dBc

3rd Harmonic <-45 dBc

Non-Harmonics & Spurious (at offset from selected frequency): ±10 kHz to ±1.5 MHz: <-30 dBc in band

±1.5 MHz to band end: <-55 dBc (If image <-35 dB)

RF Output Power -127 dBm to -20 dBm (10 dB steps with 11 dB range vernier into 50 ohms
RF Output Accuracy ±2.5 dB (±3 dB at frequencies >800 MHz and levels between -120 dBm and -127 dBm for FM/AM- 12005 thru S/N 7698 and FM/AM-1200A thru S/N 1676
Variable Generate When in the “locked” position, the generator is phased locked to the master oscillator. When switched from the “locked” position, the generator may be varied ±10 kHz.
Internal Modulation:
  Deviation Range 0 to 50 kHz (with 1 kHz tone)
  % AM Range 0 to 90% (with 1 kHz tone)
External Modulation:
Frequency Response FM: 2 Hz to 30 Hz (DC when in variable generate)

AM: 10 Hz to 10 kHz (30% maximum modulation above 5 kHz).

Modulation Sensitivity FM: .1 VRMS/kHz (-0 to +30%)

AM: .01 VRMS/% (-O to +30%)

Distortion (at 1 kHz sine) FM: <1% to 20 kHz deviation

<10% to 60% modulation

Input impedance 10K Ohms nominal

Duplex Generator

Frequency Range ±49.99 MHz from receive frequency in 10 kHz steps
Frequency Resolution 2.5 kHz
Frequency Accuracy (See Master Oscillator)
Output Level:
  DUPLEX Port (FM/AM-1200A)

-60 dBm ±1O dB fixed level into 50 ohm

  DUPLEX HIGH (FM/AM-1200S)

-15 dBm into 50 ohms ±10 dB

  DUPLEX LOW -40 dBm into 50 ohms I -25 dB ±5 dB below DUPLEX HIGH at the same frequency)
Input Protection 0.25 WATT (maximum without damage)
T/R Port (FM/AM-1200A) -80 dBm ±10 dB fixed level (FM/AM-1200S) -85 dBm ±10 dB fixed level

Receive/Monitor

Frequency Range 10 kHz TO 999.9999 MHz IN 100 Hz increments
Sensitivity 2 µV typical (1 MHz to 1000 MHz FM narrow)
Selectivity (at 3 dB)
MODE RECEIVER

BANDWIDTH

AUDIO

BANDWIDTH

FM WIDE 200 kHz 80 kHz
FM MID 200 kHz 8 kHz
FM NAR 15 kHz 8 kHz
SSB 6 kHz 8 kHz
AM NAR 6 kHz 8 kHz
AM NORM 15 kHz 8 kHz
Adjacent Channel Rejection
RECEIVER

BANDWIDTH

GREATER THAN

40 dB DOWN

200 kHz ±300 kHz
15 kHz ±27 kHz
6 kHz ±15 kHz
Impedence 600 Ohms
Output Level (Into an open circuit):

FM: 60 mVRMS/l kHz (nominal)

AM: 5 mVRMS/% (nominal)

Receiver Antenna Input Protection 0.25 watt (maximum without damage)

Power Meter

Range 0 to 15 and 0 to 150 WATTS peak or average responding
Accuracy 1 to 600 MHz ±7% of reading of full scale. 600 to 1000 MHz ±20% of reading ±3% of full scale
Input Power 50 WATTS continuous

>50 to 150 WATTS, one minute “ON”, five minute: “OFF”

Frequency Error Meter

RF Accuracy Master Oscillator ±3% of full scale
RF Ranges ±10 kHz, ±3 kHz, ±1 kHz, ±300 Hz,

±100 Hz, ±30 Hz full scale

Audio Counter:
  Frequency Range: 10 Hz to 12 kHz
  Accuracy: ±0.01% ±3% of full scale
  Ranges: ±300 Hz, ±30 Hz, ±t3 Hz full scale

Modulation Meter

FM Deviation:
  Accuracy ±5% of reading

±3% of full scale for a 1 kHz tone

  Ranges: 2 kHz, 20 kHz, 60 kHz full scale
AM % Modulation
  Accuracy ±5% of reading

±3% of full scale for a 1 kHz tone

  Ranges 60%, 200% full scale

SINAD/Distortion Meter

SINAD 3 to 20 dB at 1 kHz
  Accuracy ±1 dB at 12 dB SINAD
Distortion Range 0 to 20% at 1 kHz
  Accuracy ±1% at 10% distortion
Input Level 0.25 VRMS to 2 VRMS (10 VRMS maximum
Impedence 10K 0hm Nominal

Function Generator

Functions SINE, SQUARE, RAMP, TRIANGLE, DTMF, TONE SEQ and DCS
Tone Accuracy:
  Fixed (Same as Master Oscillator)
  Variable ±0.01%
Tone Distortion (at 2.5 VRMS output)
  Fixed <0.5%
  Variable (SINE) <2% (10 Hz to 100 Hz)

<0.7% typical (100 Hz to 30 Hz)

Tone Output Level Variable to 2.5 VRMS minimum, either tone into 150 Ohm load
Frequency Range (Variable) 10 Hz to 30 kHz in 0.1 Hz increments
DTMF Encode:
  Deviation 3.5 kHz Fixed (±500 Hz)
  Mark Time 50 mSec Minimum
  Space Time 50 mSec Minimum
DTMF Decode (Optional) See Digital Voltmeter

Oscilloscope

Display Size 2 inches X 2.5 inches
Vertical Bandwidth DC to 1 MHz (at 3 dB Bandwidth)
External Vertical Input Ranges 10 mV, 100 mV, 1 V, 10 V per division
Horizontal Sweep Rate FM/AM-1200A- 10 mSec, 1 mSec, 100 µSec, 10 µSec, 1 µsec per division

FM/AM-1200S – 10 mSec, 1 mSec, 100 µSec, 10 µSec per division

Master Oscillator

Standard TCXO (Thru FM/AM-1200A S/N 1499, thru FM/AM-1200S S/N 5411):
  Stability 0.5 PPM (0.50° C)
  Aging 1 PPM per year
Standard TCXO (FM/AM-1200A S/N 1500 and on, Option 1 thru FM/AM-1200A S/N 149 FM/AM-1200S S/N 5412 and on. Option 1 thru FM/AM-1200S S/N 5411):
  Stability 0.2 PPM (0.50° C)
  Aging 0.5 PPM per year
Optional Oven Oscillator (Option 2):
  Stability 0.05 PPM (0.50° C)
  Aging 0.25 PPM per year

General Characteristics

Temperature Range 0 to 50º C

Power Requirements

Line 105 to 130/210 to 260 VAC

50 to 400 Hz at 60 WATTS typical

Ext. DC 12 to 30 VDC nominal, 3.5 AMPS at 12 V typical, 1.5 AMPS at 28 V typical

1 thought on “FM/AM-1200 S/A CAPABILITIES”

  1. Im Looking for a replacement Mic and antenna for my old ifr 1200.
    I thought maybe you could help.
    thanks
    john

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