CONFID^fTIAL 
*  *USAINSCOM  Regulation  105-14 
DEPARTMENT  OF  TOE  ARMY 
UNITED  STATES  ARMY  INTELLIGENCE  AND  SECURITY  COMMAND 
Arlington  Hall  Station 
Arlington.  Virginia  2221? 
USAINSCOM  Regulation 
No.  105-14 
1  October  1981 
Communications- Electronics 
TACTICAL  DIRECTION  FINDING  (DF)  FLASH  AND  REPORT  COMMUNICATIONS  PROCEDURES  (U) 
The  word  "he"  when  used  in  this  publication  represents  both  the  male 
and  female  genders.   Any  exception  to  this  will  be  noted. 
Paragraph        Page 
SECTION   I   GENERAL 
Purpose      1  1 
Scope     2  1 
II   OBJECTIVES 
Standardization     3  2 
Approval  for  Deviation      4  2 
III   CONTINUOUS  WAVE  COMMUNICATIONS 
General    5  2 
Report  Circuit  Operation     6  4 
Flash  Circuit  Operation     7  12 
IV   OFF-LINE  TELEPRINTER  COMMUNICATIONS 
General     8  18 
Report  Circuit  Operation     9  19 
Flash  Circuit  Operation     10  21 
APPENDIX  A   Procedural  Signs  (PROSIGNs;      -  A-l 
APPENDIX  B   International  "Q"  and  "Z"  Operating 
Signals  Recommended  for  Use  as 
Supplemental  Material  to  USSID  103, 
Annex  F  
   -  B- 1 
SECTION  I 
GENERAL  (U) 
1.  (U)   PURPOSE.   This  regulation  provides  standard  criteria  for  communica- 
tions procedures  for  use  on  tactical  DF  nets.   Local  commanders  are  authorized 
to  publish  detailed  local  communi cat ions  procedures  in  the  form  of  standing 
operating  procedures,  provided  the  basic  instructions  outlined  herein  are  followed 
2.  (U)   SCOPE.   This  regulation  applies  to  all  US  Army  Intelligence  and  Security 
Command  (USAINSCOM)  organizations  and  units  engaged  in  or  responsible  for  DF  opera- 
tions.  Where  conflict  exists  with  other  documents  concerning  communications 
procedures,  the  instructions  contained  herein  will  apply  for  USAINSCOM  tactical  DF 
nets. 
*  This  regulation  supersedes  USAINSCOM  Regulation  105-14,  27  February  1974, 
including  change  1. 
CONF 
XTTTiTAT       CLASSIFIED  BY:      DOD  DIR  S5200.17    (M 
JN11AL     REVIEW  ON:      30  September  1937
UNCLASSIFIED 
1  October  1981 
USAINSCOM  Regulation 
No.  105-K 
SECTION  II 
OBJECTIVES  (U) 
3.  (U)  STANDARDIZATION.   Normally,  two  distinctly  separate  circuits  will  be 
used  for  DF  net  communications.   These  circuits  are  comoonly  referred  to  as 
"Flash"  and  "Report."  The  reason  for  separate  circuits  is  to  permit  uninter- 
rupted flash  operation.   The  report  circuit  is  used  for  bearing  reports  and 
administrative  traffic.   In  certain  instances  it  may  be  necessary  to  teopo- 
rarily  conduct  flash  and  report  operations  on  the  same  circuit  in  a  net  or  on 
individual  links  within  the  net.   These  deviations  are  discussed  further  in 
sections  III  and  IV. 
4.  (U)  APPROVAL  POR  DEVIATION.   To  maintain  standardization,  requests  for 
deviations  from  normal  operations  on  a  r^nnanent  basis  will  be  forwarded 
through  command  channels  to  this  Headquarters,  ATTN:   IAOPS-SEI,  for  approval. 
However,  in  time  of  emergency,  interim  approval  may  be  granted  by  the  local 
commander. 
SECTION  III 
CONTINUOUS  WAVE  COMMUNICATIONS  (U) 
5,   (U)  GENERAL. 
a.   (U)  Transmitting  Techniques. 
(1)  (U)  The  attainment  of  reliability,  security,  and  speed  depends  largel; 
on  the  operator.   It  is  essential  that  he  be  well  trained,  maintain  circuit 
discipline,  and  thoroughly  understands  his  responsibilities. 
(2)  (U)   Adherence  to  prescribed  procedures  is  mandatory.   Unauthorized 
departures  or  deviations  from  prescribed  procedures  create  confusion,  reduce 
reliability,  and  tend  to  nullify  security  precautions. 
(3)  (U)  The  following  basic  rules  are  essential  to  transmission  security 
and  shall  be  strictly  enforced  on  all  DF  communications  circuits  within  the 
USAINSCOM. 
(a)  (U)  No  transmission  shall  be  made  which  has  not  been  authorized  by 
proper  authority. 
(b)  (U)  The  following  practices  are  specifically  forbidden: 
Violation  of  radio  silence. 
Unofficial  conversation  between  operators. 
Transmitting  without  permission. 
Excessive  tuning  and  testing. 
Transmitting  the  operator's  personal  sign  in  the  clear. 
UNCLASSIFIED
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1  October  1981  USAINSCOM  Regulation  105- U 
Unauthorized  use  of  plain  language. 
Use  of  other  than  authorized  procedures  signs  (PROSICNs)  and 
operating  signals. 
Use  of  oiher  than  author*  2*»d  r-l«*n  i*r.guage  in  place  of 
appllcahle  PROSICNs  or  operating  signals. 
Use  of  profane,  indecent,  or  obscene  language. 
Use  of  excessively  long  call-up. 
(c)   (U)  The  following  practices  are  to  be  avoided: 
Use  of  excessive  transmitting  power. 
Excessive  time  consumed  in  changing  frequency  or  adjusting 
equipment. 
Transmitting  at  speeds  beyond  the  capabilities  of  receiving 
operators. 
(A)   (U)  Each  character  will  be  transmitted  clearly  and  distinctly. 
(5)   (U)  Accuracy  in  transmission  is  far  more  important  than  speed 
especially  with  respect  to  flash  missions  and  bearing  reports.   The  difference 
in  time  required  to  transmit  a  message  at  12  words  per  minute  and  that  required 
to  transmit  the  same  message  at  18  words  per  minute  is  slight  when  the  length  of 
the  entire  transmission  is  considered.   The  time  saved  by  high  speed  transmission 
can  be  nullified  if  additional  time  is  required  for  repetitions. 
(6)   (U)  The  speed  of  transmission  will  be  governed  by  receiving  conditions 
and  the  capabilities  of  the  receiving  operator(s). 
(7)  (U)  When  deemed  advisable,  the  net  control  station  may  prescribe  the 
speed  of  transmission  on  a  circuit  and/or  the  qualification  of  the  operators  to 
be  employed  during  specific  periods.  However,  in  no  case  will  the  prescribed 
transmission  speed  exceed   18  words  per  minute. 
(8)  (U)  Speed  kevs  will  not  be  used  on  USAINSCOM  DF  circuits. 
b.  (U)  PROSICNs .  PROSIGNs  consist  of  one  or  more  letters  which  are  used 
to  facilitate  conmunica Lions  efficiency  by  conveying,  in  a  condensed  standard  form, 
certain  frequently  used  orders,  instructions,  requests  or  information.   The  PROSICNs 
listed  in  appendix  A  will  be  used  for  DF  communications  by  USAINSCOM  units. 
c.  (U)  Operating  Signals.   Operating  signals  consist  of  the  "Q"  and  "Z" 
codes.   These  codes  provide  a  rapid  and  efficient  means  of  transmitting  often  used 
directives  and  requests.   Annex  F,  USSID  103  contains  a  list  of  Special  Operating 
UNCLASSIFIED
CONFIi^JTIAL 
USAINSCOM  Regulation  105-14 
1  October  1981 
Signals  which  are  authorized  for  use  on  US  Army  DF  communications  circuits. 
Since  Annex  F,  US SID  103  contains  only  the  signals  which  are  unique  to  DF 
operations,  a  supplementary  li6t  of  authorized  international  signals  has  been 
included  as  appendix  B.   Theater  headquarters  may  authorize  the  use  of  addi- 
tional "Q"  and  "Z"  signals  from  Allied  Communication  Publication  131  (B)  by 
their  subordinate  units  as  required.   In  the  event  of  a  misunderstanding  in 
communications  signals,  unclassified  "Q"  and  "Z"  signals  will  not  be  used 
to  explain  or  modify  special  operating  signals  contained  in  Annex  F, 
USSID  103. 
6.  (U)  REPORT  CIRCUIT  OPERATION. 
VTTAY
CONFIDENTIAL 
1  October  1981 
USAINSCOM  Regulation  105-!^ 
b.   (U)  Assumption  of  Net  Control  Functions, 
d.   (U)  Calling. 
(1)  (U)  All  transmissions  on  the  report  circuit  shall  be  preceded  by  call- 
signs.   Callsigns  are  initiated  by  unit  Communications  and  Electronics  Operating 
Instructions  (CEOI) . 
(2)  (U)  When  contacting  outstations  the  control  station  may  initiate  a  single 
call  to  individual  stations,  a  multiple  call  to  selected  stations,  or  a  net  call. 
In  any  case,  outstations  shall  reply  in  the  order  prescribed. 
(3)  (U)  Only  the  radio  station  callsigns  assigned  by  the  appropriate  command 
shall  be  used  in  calling  and  answering. 
(a)  (U)  Single  call:   RY423  DE  BF645  K. 
(b)  (U)  Multiple  call:   A6AEI  BL72P  J2PYN  DE  BF645  K  (NOTE:   Stations  shall 
answer  in  the  order  called.) 
CONI^E^ 
NT"    L
UN  CLASS!  f-"ltu 
USAINSCOM  Regulation  105-14  1  October  19S1 
(c)   (U)   Collective  call  (K4945  represents  the  "net"  callslgn): 
To  ell  addressees:   K4945  DE  BF645  K  (NOTE:   Stations  shall  answer 
in  alphabetical  and  numerical  order,  or  In  an  order  designated.) 
Exempting  one  station:   K4945  XMT  3TWD2  DE  BF645  K. 
(4)  (U)   Under  difficult  operating  conditions,  the  callsigns  may  be  trans- 
mitted twice.   For  example:   K4945  K4945  DE  BF645  BF645  K. 
(5)  (U)   Before  transmitting,  an  operator  shall  listen  to  the  activity  on 
the  circuit  to  ascertain  that  his  transmission  will  not  cause  harmful  inter- 
ference to  transmission  already  in  progress.   If  such  interference  is  likely,  the 
operator  shall  wait  until  the  first  break  in  transmission  before  keying. 
e.   (U)   Answering. 
(1)  (U)   In  answering  a  preliminary  call,  stations  shall  transmit  the  identi- 
fication of  the  calling  station,  the  PROSIGN  DE,  the  answering  station,  and 
appropriate  PROSIGNs,  e.g.,  K,  AS,  AR,  etc.   After  initial  contact  has  been  estab- 
lished and  when  no  confusion  may  result,  station  may  answer  without  the  identification 
of  the  calling  station. 
(a)  (U)   Complete  answer:   BF  645  DE  BJ2PE  K. 
(b)  (U)   Abbreviated  answer:   DE  BJ2PE  K. 
(2)  (U)   When  answering  or  receiptinp  in  response  to  a  collective  or  multiple    , 
call,  stations  shall  answer  or  receipt  in  alphabetical  and  numerical  order  or  in  ar. 
order  designated.   If  desired,  net  control  may  specify  a  fixed  order  other  than 
alphabetical  and  numerical  for  answering  a  collective  call. 
(3)  (U)   If  any  station  fails  to  answer  in  proper  sequence  when  a  multiple  or 
collective  call  is  employed,  the  next  station  in  sequence  answers  after  5  seconds. 
The  station  which  fails  to  answer  in  proper  order  must  wait  until  all  other  stations 
have  answered  or  have  had  time  to  answer. 
(4)  (U)   When  a  station  has  failed  to  answer  in  sequence,  then  fails  to  answer 
within  5  seconds  after  all  other  stations  have  had  time  to  answer, the  calling 
station  shall  initiate  a  separate  call  to  contact  the  station. 
(5)  (U)   When  any  station  included  in  a  collective  or  multiple  call  is  specific- 
ally directed  to  answer,  no  other  station  included  in  that  call  may  answer  until 
instructed  to  do  so. 
(6)  (U)   When  a  station  hpars  a  call  without  being  certain  for  whorr.  the  call 
is  intended,  the  station  shall  not  answer  until  the  call  has  been  repeated  and 
understood. 
(7)  (13)   When  a  station  is  called  but  is  uncertain  of  the  callsign  of  the 
UNCLASSIFIED
CONFIDENTIAL 
1  October  1981 
USAINSCOM  Regulation  105-H 
calling  station,  it  shall  answer  immediately  by  transmitting  the  PROSIGN  AA, 
followed  by  DE,  and  its  own  callsign. 
(8)   (U)  When  an  answer  cannot  be  obtained  from  a  station  called,  messages 
may,  in  case  of  emergency,  be  transmitted  blind  at  the  discretion  of  the  local 
commander.   Each  message  shall  be  transmitted  twice,  with  PROSIGN  IMI  separating 
the  first  and  second  transmissions.   Subsequent  efforts  shall  be  made  to  obtain 
a  receipt. 
f.   (U)  Authentication. 
(1)   (U)  Experience  has  shown  that  communications  intrusion  and  deception 
are  not  uncommon  in  radio  net  operations.   For  this  reason,  the  importance  of 
utilizing  authentication  procedures  cannot  be  overemphasized.   The  authentication 
system  described  below  shall  be  used  on  ail  USAINSCOM  DF  communications  circuits 
for  establishing  the  authenticity  of  transmissions  considered  suspect. 
CONFIDENTIAL
1  October  1981 
CONra^NTIAL 
USAINSCOM  Regulation  104-14 
h.   (U)   Signal  Strength  and  Readability. 
(1)  (U)   A  station  assumes  that  it  has  a  readability  of  "good"  unless 
otherwise  notified.   Signal  strength  and  readability  reports  will  not  be  ex- 
changed unless  communications  are  unsatisfactory. 
(2)  (U)   Readability  is  the  ease  with  which  the  incoming  signal  can  be 
received.   This  depends  on  the  relative  strength  of  the  desired  signal  as  opposed 
to  the  undesired  signals  (interference,  static,  etc)  and  on  the  capabilities  of 
the  receiving  operator.   Readability  is  indicated  by  means  of  an  appropriate 
operating  signal  (ORK)  followed  by  a  numeral.   The  meaning  of  the  numeral  is  as 
follows: 
1  -  Bad 
2  -  Poor 
3  -  Fair 
U  -  Good 
5  -  Excellent 
(3)  (U)   The  use  of  signal  strength  reports  will  be  limited  to  those 
occasions  in  which  the  actual  signal  strength  rather  than  readability  is  a 
determining  factor.   Signal  strength  reports  are  particularly  applicable  when 
changes  have  been  made  in  equipment,  power,  or  locations,  or  other  conditions 
make  a  test  report  on  signal  strength  desirable.   Signal  strength  is  indicated 
by  means  of  an  appropriate  operating  signal  (QSA)  followed  by  a  numeral.   The 
meaning  of  the  numeral  is  as  follows: 
1  -  Scarcely  perceptible 
2  -  Weak 
3  -  Fairly  good 
A  -  Good 
5  -  Very  good 
(4)  (U)   During  periods  of  poor  readability  the  operator  may  request  to 
have  "words  sent  twice"  by  using  the  operating  signal  QSZ. 
(5)  (U)   When  it  is  necessary  for  a  station  to  initiate  test  signals, 
either  for  the  adjustment  of  a  transmitter  before  making  a  call  or  for  the  adjust 
ment  of  a  receiver,  these  sienals  will  consist  of  not  more  than  three  series  of 
of  3Vs  followed  by  a  10-second  dash  and  the  callsign  of  the  station. 
rn\n?m 
TAT
CONFLyCNTIAL 
■FjpL 
USAINSCOM  Regulation  104- 14 
1  October  1961 
Example:      BT  VW  VW  VW 
DE  BF645  AR 
(10-second  dash) 
i.   (U)   Time  Used  In  DF  Communi cations. 
(1)  (U)   Greenwich  Mean  Time  (ZULU)  will  be  used  in  all  DF  net  operations. 
Time  will  be  recorded  to  the  nearest  minute. 
(2)  (U)   On  request  only,  time  signals  will  be  sent  by  net  control,  via 
the  report  circuit. 
(3)  (U)   The  time  signal  transmission  will  consist  of  a  call,  the  operating 
signal  ZUA,  and  the  ZULU  time  transmitted  twice.  The  numerals  indicating  the 
time  will  be  followed  by  a  5-second  dash  terminating  exactly  at  the  time  indicated 
For  example:   K4945  DE  BF645  ZUA  1845  1MI  1845  (5-second  dash)  AR. 
7.   (U)   FLASH  CIRCUIT  OPERATION. 
r«AX[i?m^TTAT,
CONFI 
USAINSCOM  Regulation  10A-H 
:mp$ JTIAL 
1  October  1981 
(b)  (U)   Frequency  group. 
(c)  (0)  Callsign  group. 
(d)  (U)  Preliminary  tracking  group 
CONTINUAL
confj^€ntia^ 
USAINSCOH  Regulation  104- 14 
1  October  1981 
normal  flash  except  that  the  tracking  is  not  transmitted  and  the  tip-off  is 
terminated  immediately  following  the  repetition  of  the  mission  data.   It  is 
the  responsibility  of  the  tip-off  station  to  record  all  available  data  on  the 
desired  transmission  and  furnish  the  information  to  net  control,  if  requested 
g.    (U)  Alert  Brevity  Groups 
(1) 
Section  IV 
OFF-LINE  TELEPRINTER  COMMUNICATIONS  (U) 
8.  (U)   GENERAL.   Off-line  teleprinter  communications  provide  for  reliability 
and  speed  of  transmission. 
a.  (U)   Communications  Procedures.   Flash  and  report  circuits  are  utilized. 
However,  the  communications  procedures  used  will  depend  on  the  facilities  avail- 
able within  each  net. 
b.  (U)   Circuit  Discipline.   Circuit  discipline  and  security  practices 
applicable  to  other  USAINSCOM  DF  communication  circuits  apply  to  off-line  communi- 
cations. 
nnxrom 
B^fn 
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tONFJpfNTIAL 
USAINSCOM  Regulation  105-14 
(2) 
1  October  1981 
f.   (U)   Printing  Accuracy  and  Testing  Procedures,   The  use  of  a  printing 
accuracy  report  is  applicable  when  changes  have  been  made  in  equipment,  power, 
locations,. -or  other  conditions.   Printing  accuracy  is  indicated  by  means  of  an 
appropriate  operating  signal  (ZBZ)  followed  by  a  numeral.   The  meaning  of  the 
numeral  is  as  follows: 
1  -  Totally  corrupt. 
2  -  Very  corrupt. 
3  -  Partly  corrupt  rendering  traffic  unacceptable. 
A  -  Occasionally  corrupt  but  traffic  acceptable. 
5  -  Perfect,  no  corruption. 
When  it  is  necessary  for  a  station  to  transmit  a  test  for  repair  or  adjustment  of 
equipment,  the  test  will  be  sent  as  follows: 
DE  DCR12  TESTING  BT 
RYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRY 
RYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRY 
ir%f\'*.TTr\ 
TTTIT  A  V
UNCLASSIFIED 
1   Octoberl981  USAINSCOM  Regulation    105- U 
RYRYRYKYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRyRYRYKYRYRYRYRYFYRYRYRYRy 
THE  QUTCK  BROWK  FOX  JUMPS   OVER  THE  LAZY   DOC'S  BACK 
THE  QUICK  BROWN   FOX  JUMPS   OVER  THE  LAZY  DOC'S  BACK 
BT   INT  ZBZ   K 
g.   (U)   Time  Signals.   Time  signals  will  be  sent  by  NCS  via  the  report 
circuit  upon  request  only. 
10-   (U)   FLASH  CIRCUIT  OPERATION. 
a.  (U)   Description.   The  flash  circuit  will  normally  be  a  "send  only" 
circuit  utilized  by  net  control,  alternate  net  control  or  be  designated  flashing 
stations,  and  will  normally  be  reserved  exclusively  for  the  transmission  of 
flashes. 
* 
b.  (U)   Operation.   Operation  of  the  flash  circuit  will  be  in  accordance 
with  the  procedures  applicable  to  &:   operations;  however,  the  flash  heading 
need  only  be  sent  once. 
UNCLASSIFIED
UNCLASSIFIED 
USAINSCOM  Regulation  105-14  1  October  1981 
Appendix  A 
PR0S2GKS  (U) 
PROSIGNs  listed  below  will  be  used  for  DF  CW  communications  by  units  of  the 
command.  A  line  over  two  or  wore  letters  indicates  that  overscored  letters 
are  to  be  transmitted  as  a  single  character. 
a.  (U)  AA  (unknown  station).  AA  Is  used  in  lieu  of  a  callsign  when 
establishing  communications  with  a  station  whose  callsign  16  not  known  or  is 
not  recognized. 
b.   (U)   AA  (all  after)  and  AB  (all  before).   These  PROSIGNs  arc  used 
after  IMI  and  certain  operating  signals  to  identify  a  portion  of  a  message. 
c.  (U)   AR   (end  of  transmission).   This  PROSICN  means  "this  Is  the  end 
of  my  transmission  to  you  and  no  response  is  required  or  expected." 
d.  (U)   AS   (wait). 
(1)  (U)  AS,  made  during  a  transmission  and  without  an  ending  sign, 
Indicates  a  short  pause. 
(2)  (U)  AS  followed  by  AR  means  "you  are  to  wait"  or  "I  am  obliged  to 
wait,"  as  applicable. 
(3)  A  station  having  received  AS  will  wait  for  K  before  transmitting 
unless  in  the  meantime  the  station  has  a  high  precedence  message  to  transmit  or 
It  appears  to  have  been  overlooked. 
e;   (U)   B  (more  to  follow). 
<il)   (U)   In  the  final  instructions,  B  rean*  "mo-e  to  follow." 
(2)  (U)   In  the  final  instruction,  B  followed  by  a  callsign  means  "more 
to  follow  to  the  station  Indicated." 
(3)  During  a  transmission,  B  followed  by  a  numeral  means  "more  to  follow: 
total  number  of  groups  transmitted  thus  far  is  as  indicated." 
f.  (U)  BK  (Break-in  signal).  BK  is  used  to  break  the  transmission  of 
another  station  in  the  net. 
g.  (U)   BT  (long  break).   BT  Is  used  to  indicate  the  separation  between 
the  test  and  other  portions  of  a  message. 
h.   (U)   CT  (alert  signal).   CT  immediately  preceding  a  transmission,  serve: 
as  an  alert  or  starting  signal. 
UNCLASSIFIED  A1
on 
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1  October  1981  USAINSCOM  Regulation  105-14 
i.   (U)   DE  (from).   DE  Is  used  only  In  the  call-up  and  means  "this 
transmission  Is  from  the  station  whose  designation  follows." 
J.   (U)   EEEEEEEE  (error). 
(1)  (U)   To  correct  an  error,  a  succession  of  eight  or  more  Es  is 
transmitted  and  means  "an  error  in  transmission  has  Just  been  made."  In 
correcting  errors,  the  error  sign  will  be  followed  by  the  last  group,  pROSICK 
or  operating  signal  correctly  sent.   The  operator  then  continues  with  correct 
version.   (The  phrase,  "eight  or  more  Es"  is  intended  to  facilitate  standardized 
operations  and  shall  not  be  construed  to  permit  transmission  of  an  excessive 
number  of  Es.    Operators  should  restrict  the  number  of  Es  to  a  range  of  8  to 
12.) 
(2)  (U)   To  cancel  a  transmission  while  in  progress,  a  succession  of 
eight  or  ©ore  Es  followed  by  the  PROSIGN  AR  means  "this  transmission  is  in  error; 
disregard  it." 
1c   (U)   HM  (emergency  silence).   Emergency  silence  may  be  imposed  or 
lifted  by  a  station  only  when  authorized  by  competent  authority.   The  trar^rissi 
which  imposes  emergency  silence,  lifts  emergency  silence,  or  calls  a  station  during 
a  period  of  emergency  silence. 
(1)  (U)   Stations  do  not  answer  or  receipt  for  a  transmission  imposing 
emergency  silence  (provided  the  authentication  is  correct).   Thereafter,  the  im- 
posed radio  silence  will  be  strictly  observed  unless  otherwise  directed  by 
competent  authority. 
(2)  (U)   HM  transmitted  three  times  means  "cease  radio  transmission  immedi- 
ately.  Silence  will  be  maintained  until  directed  to  resume," 
(a)   (U)  Example  cf  NCS  imposing  emergency  alienee  on  the  flash  circuits: 
CT  CT  HM  HM  ZNB3  EM  V  AR 
(bT"  (U)   Example  of  NCS  imposing  emergency  silence  on  a  report  circuit 
vhoae  collective  callsign  is  X4945: 
K4945  K4945  DE  BF645  HM  KM  HM  ZNB3  EN  J  AR 
(3)  (U)   HM  transmitted  three  times  and  preceded  by  ZUG  (negative)  means 
"emergency  ailence  is  lifted;   resume  normal  operations." 
(a)   (U)   Example  NCS  lifting  emergency  silence  on  a  report  circuit  whose 
collective  callsign  is  K4945: 
K4945  KA945  DE  BF645  ZUG  HM  HM  HM  2NB3  EO  C 
A- 2 
UNCLASSIFIED
UNCLASSIFIED 
USAINSCOM  Regulation  105-K  *  October  1981 
IMI  ZUC   KM  HM  KM  ZNB3  EO  C  K 
NOTE:   Upon  resuming  normal  operations,  each  station  will,  in  turn,  contact 
net  control  and  provide  proper  authentication. 
(b)   (U)   Example  of  NCS  lifting  emergency  silence  on  the  flash  circuit: 
CT  CT  ZUG  HM  HM  HM  ZKB3  EP  S  IMI  ZUG  HM  HM  HM  7NB3  EP  S  AR 
1.   (U)   II  (separative  sign).   This  PROSIGN,  written  as  a  hyphen,  is  trans- 
mitted to  preclude  error  in  group  separation  by  the  receiving  operator. 
m.   (U)   IMI  (repeat).   IMI  means  "repeat,  or  I  am  going  to  repeat,  a 
message  or  portions  of  a  message  as  indicated." 
(1)  (U)   IMI  without  identification  data  means  "repeat  the  indicated 
portion  of  your  transmission." 
(2)  (U)   IMI  followed  by  identification  data  means  "repeat  the  Indicated 
message  of  your  transmission." 
(3)  (U)   IMI  sent  between  the  first  and  second  transmission  of  a  message 
means  "I  am  going  to  repeat  this  message." 
(A)   (U)   IMI  cannot  be  used  to  obtain  a  repetition  of  a  message  or  a 
portion  thereof  for  which  a  receipt  has  been  given.   A  procedural  message,  con- 
taining an  operating  signal,  will  be  used  for  this  purpose. 
(5)   (U)   IMI  shall  not  be  used  to  correct  an  error  in  transmission. 
n.   (U)   INT  (interrogatory). 
(1)  (U)   INT  preceding  operating  signals  or  other  PROSIGNs  indicates  that 
the  transmission  is  in  the  form  of  a  question. 
(2)  (I))   INT  preceding  a  portion  of  a  message  means  "is  my  reception  of 
this  correct?" 
(3)  (U)   INT  cannot  be  used  to  question  any  part  of  a  message  for  which 
a  receipt  has  been  given.   A  procedural  message,  containing  an  operating  signal 
will  be  used  for  this  purpose. 
o.   (U)   IX   (execute  to  follow).   The  uses  of  the  "execute  to  follow"  and 
"execute"  PROSIGNs  are  explained  in  paragraph  7e(4),  Section  III. 
p.   (U)   K  (Invitation  to  transmit).   K  means  "this  is  the  end  of  my  trans- 
mission to  you  and  a  response  is  necessary." 
q.   (U)   R  (received). 
UNCLASSIFIED 
A- 3
UNULAbbl.    -U   ;   
1  October  1981  U3AINSC0M  Regulation  105-U 
(1)  (U)   R  preceded  by  INT  means  "have  you  received  ay  last  transmission?" 
(2)  (U)   R  means  "I  have  received  your  last  transmission." 
(3)  (U)  R  preceded  by  IK?  and  followed  by  identification  data  means 
"have  you  received  the  message  indicated?" 
(A)   (U)   R  followed  by  identification  data  means  "I  have  received  the 
message  indicated." 
r.   (U)   XMT  (exempt).   XKT  means  "the  station  or  addressee  immediately 
following  is  exempted  from  the  collective  call  or  address." 
A-4 
UNCLASSIFIED
UNCLASSIFIED 
USAINSCOM  Regulation  105-U  1  October  1981 
Appendix  B 
INTERNATIONAL  "Q"  AND  "Z"  OPERATING  SIGNALS  RECOMMENDED 
FOR  USE  AS  SUPPLEMENT  TO  USSID  103,  ANNEX  F  (U) 
*QAP 
QRU 
QTR 
ZDB 
*ZKA 
ZTE 
QBM 
QRV 
QUC 
ZDE 
ZKJ 
ZTF 
QCB 
QRW 
ZAA 
2D? 
zkk 
ZTG 
*QCS 
*QRX 
ZAC 
ZDJ 
ZKL 
ZUA 
QDB  *QRZ  ZAD  ZDK  *ZKV  ZUB 
kQIF  QSA  ZAE  ZDM  ZNB  ZUC 
kQLH  QSB  ZAJ  ZDN  *ZNC  ZUD 
<QMH 
QSD 
ZAQ 
ZDO 
ZND 
ZUE 
QRA 
*QSI 
ZAX 
*ZDO 
ZNQ 
ZUG 
QRH  QSL  *ZAY  ZEC  ZOB  ZUH 
QRI  >QSN  ZBK  ZEH  ZOD  ZUJ 
QRK  QSO  ZBL  ZEK  ZOF  ZVF 
QRL  *QSV  ZBO  ZES  ZOG  ZWG 
QRM  *QSX  ZBP  ZEW  ZPC  ZVH 
QRNi-  *QSY  *ZBV  ZFH  *ZRE 
QRQ  QSZ  *ZBW  ZFI  *ZRJ 
QRS 
QTA 
*ZBX 
ZGF 
*ZRG 
QRT 
QTB 
ZDA 
ZGN 
ZTC 
*When  frequency  must  be  Indicated,  code  letters  will  be  used  (in  lieu  of  the 
actual  frequency) . 
UNCLASSIFIED 
B-]
1  October  1981 
CONFIM&TiAL 
USAINSCOM  Regulation  105-U 
The  proponent  of  this  regulation  la  the  Office  of  the  Deputy  Chief 
of  Staff  for  Operations.  Users  are  invited  to  aend  eonments  and 
suggested  Improvements  on  DA  Form  2028  (Recommended  Changes  to 
Publications  and  Blank  Forms)  to  this  headquarters,  ATTN:  IAOPS-SEI-R 
FOR  THE  COMMANDER: 
OFFICIAL: 
JAMES  W.  SHUFELT 
Colonel,  CS 
Chief  of  Staff 
rJ.  KRATKAK 
Administrative  Officer 
DISTRIBUTION: 
3  -  DCSPER 
8  -  DCSOPS 
2  -  DCSRM 
2  -  DCSLOG 
2  -  DCSSEC 
75  -  CDR,  USAICS,  Ft  Huachca,  A2 
3  -  CH,  USAINSCOM  Ln  Cp,  Ft  Meade,  MD 
1  -  C,  USA  INSCOM  LNO  PAC,  Ft  Shafter,  HI 
2  -  CDRT  USA  Fid  Sta  Homestead 
15  -  CDR,  USA  Fid  Sta  Augsburg 
3  -  CDRK  USA  Fid  Sta  Korea 
3  -  CDR, "USA  Fid  Sta  San  Antonio 
6  -  CDR,  USA  Fid  Sta  Okinawa 
6  -  CDR,  USA  Fid  Sta  Kunia 
6  -  CDR,  USA  Fid  Sta  Berlin 
1  -  CDR,  TUSLOC  Det  4 
1  -  CDR,  66th  KT  Gp 
1  -  CDR,  409th  ASA  Co 
2  -  CDR,  470th  MI  Cp,    Ft  Clayton,  Panama 
1  -  CDR,  501at  MI  Gp 
1  -  CDR,  502d  US  Bn 
1  -  CDR,  328th  ASA  Co 
CONFJPENT1AL