High Frequency Test Facility HFTF Activity Update

1
High Frequency Test Facility (HFTF) Activity
Update
JOINT INTEROPERABILITY TEST COMMAND (JITC)
Joseph Schulte
HFTF Action Officer
17 January 2002
2
AGENDA

• JITC Mission
• Summary of 2001 HFTF Test Efforts
• 2001 JITC HFTF Certifications
• MIL-STD-188-110B/141B Issues Submitted to
  Center for Military Standards
• Future Planned Tests
• 100TH Anniversary Long-Haul HF Transmissions
  
• JITC POC/Web Page Information
• Questions/Comments

3
JITC MISSION

• To support the DoDs C4I goals by providing test,
  evaluation, assessment, and certification
  services for the Joint Services,
  Commander-in-Chiefs (CINCs), Joint Task Forces
  (JTFs), Military Services, Agencies, allies, and
  private industry. To provide technical expertise
  to CINCs/Services/Agencies requests for
  assistance.
• DoD Directive 4630.5, DoD Instruction 4630.8, and
  Chairman Joint Chief of Staff (CJCS) Instruction
  6212.01B that outline the basic interoperability
  and standards conformance requirements and
  identifies the JITC as DISAs test center for
  certification of such requirements.

4
JITC MISSION

INDIAN HEAD, MD
CIVILIAN MILITARY CONTRACTOR TOTAL
48 42 92
182
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2001 HF TESTING SUMMARY
STANDARDS CONFORMANCE INTEROPERABILITY TESTS

6
2001 HF TESTING SUMMARY

• GENERAL TEST SUPPORT
• SCOPE Command Modernization
  1) Responsible Test Organization for Air Force
• 2) Supports Global HF Connectivity
• 3) 14 SCOPE Command Stations
• 4) Centralized control of Remote
  Sites from Andrews AFB

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2001 HF TESTING SUMMARY
SCOPE COMMAND WORLDWIDE LOCATIONS

Elmendorf
Croughton
Iceland
Sigonella
Offutt
Andrews
West Coast
Lajes
Yokota
Puerto Rico
Guam
Hawaii
Ascension
Diego Garcia
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2001 HF TESTING SUMMARY

GENERAL TEST SUPPORT (continued) Test
Technology Development Demonstration
1) JITC SCOPE Command Installation
2) DEMONSTRATIONS a) HF
E-Mail Demonstrations (NMSU, FEMA,
Rockwell, Civil Air Patrol)
b) High Speed Modems (above 2400 bps)
c) 3rd Generation ALE, which was
not available prior to
completion of project on 31 December 2001
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2001 HF TESTING SUMMARY
TTDD
JITC Radio Facility
Demonstration Systems
(New Mexico State University)
Modem
JITC SCOPE Command 3-Level Station with TX RX
HF Radios
PC
Modem
Radio
(Civil Air Patrol)
PC
PC
Modem
Radio
Radio Path
(FEMA)
Mail Server
PC
Modem
Radio
(Rockwell Collins, IA)
IP Router
PC
Modem
Radio
Internet
Control and Terminal System
PC
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2001 JITC CERTIFICATIONS

STANDARDS CONFORMANCE INTEROPERABILITY
CERTIFICATIONS
The AN/ARC-220 is also in-process of being
MIL-STD-188-148A tested.
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MIL-STD-188-110B/141B ISSUES
ISSUE 1 Does not appear consideration has been
given in MIL-STD-188-110B for Performance
Requirements of Modems embedded within HF radios.

Typical Modem Performance Test Configuration
Baseband HF Simulator
MODEM
BERT
MODEM
BERT
Performance Test Configuration for embedded Modem
within HF Radio
RF
Baseband HF Simulator
HF-80 Radio
Embedded MODEM Under Test
BERT
MODEM
Radio
BERT
Path
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MIL-STD-188-110B/141B ISSUES

ISSUE 1(continued) Data from manufacturers and
at JITC indicates that the added noise from the
up/down frequency conversion is between 0.5 to 2
dB, depending on the radio IF BW characteristics
and phase noise.
13

MIL-STD-188-110B/141B ISSUES

ISSUE 2 39-Tone Performance Requirements have
NEVER been fully met by any Manufacturer of HF
Modems. Most difficult requirements at 2400 bps
data Rate.
Sample Data from 39-Tone Performance Tests
?
?
?
?
?
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MIL-STD-188-110B/141B ISSUES
ISSUE 3 The required data rates for an HF
Modem to comply with MIL-STD-188-110B are
somewhat ambiguous a. Table 1 in
paragraph 4.1 indicates and HF Modem (3kHz
Channel) should operate at data rates 75-4800 bps
(PSK) and ? 150 bps (FSK). b.
Paragraph 4.2 states all data modems shall comply
with applicable requirements of paragraphs 4.2.1
through 4.2.6. c. Paragraph 4.2.1
indicates all data Modems shall operate at
signaling and modulation rates 50 and multiples
of 75 up to 9600 bps.

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MIL-STD-188-110B/141B ISSUES

• ISSUE 4 In paragraph 5.3.2.3.7.2.1 of
  MIL-STD-188-110B where the PREAMBLE SEQUENCE
  (0,1,3,0,1,3,1,2,0,D1, D2, C1,C2,C3,0) is
  discussed, there is no automatic feature for
  selecting 0.0 second (no interleaver) mode of
  operation - only short and long interleaver
  modes.

Table XV. (MIL-STD-188-110B)
No Interleaver D1 D2 ?
? . . . . .
. . . . . ? ?
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MIL-STD-188-110B/141B ISSUES

ISSUE 5 Paragraph 4.2.6.2.5 in
MIL-STD-188-110B incorrectly states that clock
period shall have a 60 duty cycle. The duty
cycle should be 50.
ISSUE 6 Phase Noise requirement for fixed site
and transportable long-haul radio transmitters in
MIL-STD-188-141B of -155 dBc/Hz for frequencies
more than 5 of carrier frequency (Fo) is an
extreme requirement that needs to be carefully
reviewed.
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MIL-STD-188-110B/141B ISSUES
MIL-STD-188-141B Fixed Site Phase Noise Reqts

0
-30
-60
-75
dBc/Hz
-90
-120
-140
Cosited
-150
Cosited
-155
Fo 5
-100 Hz
Fo- 5
100 Hz
-100 kHz
100 kHz
Fo
Frequency
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MIL-STD-188-110B/141B ISSUES

ISSUE 6(continued) Two test measurement
configurations can be used to measure phase noise.
Test Configuration for phase noise ? -140 dBc/Hz
Agilent 70420A
Attenuation
HPIB
Radio Under Test
Phase Comparator
Baseband Analysis Hardware
?
Filter
AMP
Reference Signal Generator
RF
Output (in quadrature)
Personal Computer
HPIB
Control Voltage
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MIL-STD-188-110B/141B ISSUES
ISSUE 6 (continued) TEST CONFIGURATION for
PHASE NOISE ? -140 dBc/Hz ADVANTAGES
a. Automated system for measurement.
b. Repeatability. c. Frequency Offsets
easily measured across full HF
Band. DISADVANTAGES a. Cost
(gt80k). b. Measurement limited by phase
noise of Reference Signal Generator
(normally more than -140dBc/Hz.
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MIL-STD-188-110B/141B ISSUES

ISSUE 6 (continued)
Test Configuration for phase noise ? -140 dBc
Control Lines
Phase Shifter(/- 180)
Agilent 70420A
RF quadrature
Personal Computer
Phase Comparator
Power Splitter

?
Filter
AMP
Baseband Analysis Hardware
Delay Line (50 500) yields ?d (76 762 ns)
Calibration Source
Measurement range restricted to less than 1/(2
?d) , i.e., ?d 100ns, maximum offset frequency
measurement range is 5 MHz without sin(x)/x
response compensation.
Min. output 19dBm
Radio Under Test
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MIL-STD-188-110B/141B ISSUES
ISSUE 6(continued) TEST CONFIGURATION for
PHASE NOISE ? -140 dBc/Hz ADVANTAGES
a. Measurement capability to -170 dBc/Hz
approx. b. No Reference Signal
Generator required. DISADVANTAGES a.
Cost (gt60k) (Phase shifter required in lieu of
Reference Signal Generator). b.
Manual tuning required to obtain quadrature
signal. c. Measurement range limited to
1/(2?d) at a single test frequency,
which could prevent a continuous plot
of phase noise across HF band at the test
frequency.
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MIL-STD-188-110B/141B ISSUES

• ISSUE 6 (continued)
• 1) Is -155 dBc/Hz reasonable phase noise
  requirement?
• 2) What are reasonable phase noise criteria
  that are beneficial to user and not unreasonable
  to manufacturer?

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UPCOMING MIL-STD-188-110B/141B TESTS
FY02 Planned MIL-STD Tests
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Additional FY02 Test Support

• SCOPE Command a. RTO Support b.
  STANAG 5066 Test Procedures?
• JTRS Test Procedure Development a.
  MIL-STD-188-110B update. b. MIL-STD-188-141B
  update. c. MIL-STD-188-148A update. d.
  STANAG 4529 write. e. STANAG 4539 write.

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100th Anniversary of 1st Trans-Atlantic
Communication
On 12 December 1901, Mr. Guglielmo Marconi, was
first to demonstrate long-haul HF
communications. Mr. Marconi successfully
received the first over-the-air Trans-Atlantic
Communication (letter S), using a radio
receiver made of only 12 components and a kite
for
an antenna. The transmitter (a spark gap type)
was located in Cornwall, England, which was
approximately 3500 km from Mr. Marconis
location on the coast of New Foundland.
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JITC POC/Web Page Information

• Mr. Joe Schulte
• [phone]
• schultej_at_fhu.disa.mil
• Mr. Robin Moore
• [phone]
• moorer_at_fhu.disa.mil
• JITC HOTLINE
• 1-800-LET-JITC
• hotline_at_fhu.disa.mil

GLOBAL ALE Network Callsigns JTF, JTA, and JTC
JITCs Homepage http//jitc.fhu.disa.mil with
link to HFTF web page.
JITC HF Test Facility [phone] DSN 879-4268
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QUESTIONS

• Questions/
• Comments