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255
~.ight L. Beatty, 19309$140Original only3 MHz1 watt, c.\'1., N-1RegenerativeLong wire with
counterpoise6 x 14 x 8" (radio only)17# 14 oz. (79# 5 oz.complete) *
Radio: 17# 14 oz.Equip. case: 11# 11 oz.Antenna equi~: S# 12 oz.8attery with case: 44#
'rest purposes
*Conunents:
SF - 1930
Principal use:
Designed by:Number produced:Price:Hodels:Frequency:Transmitter:Receiver:Antenna:
Dimensions:Weight:
1936 1937 1938 1939 1940 1941 1947 1948
o-m
SX
I-----~Sy t-----!,SXAf-----j-lS F
SJI--------ISPF
t---'--------l T I------~
I--.---------.j S
~---~ M f--------.j
~;~~~~!~:(:N:Aj:95G-2497 5 7)
~ :O1~... ..
'1930 1931 1932 1933 1934 1935
FIXEDBASE
MOBILE
PORTABLE
SEMIPORTABLE
Appendix I
Forest Service Radio Models-Photos, Diagrams, and Data
Chronological Development of Forest Service Radio Sets, by Type and Function
Hf Types
100 meters (2.9-3.5 MHz)
56. Milton Calloway, John Robertson,Charles Kern, and John Hertz, groupdiscussion with the author at theAerial Fire Depot, Missoula, Mont.,May 1978.
54. Forest Service, Telecommunications,vol. 3, p. 45. The Study Group wasequally complimentary to the entirecommunications organization of theForest Service.
55. Fred Link, telephone interviewwith the author in Denver, Colo.,26 January 1979.
57. The radio function was realined inthe Washington Office in 1980-81 underthe Computer Technology and Telecommunications Staff--at first renamed RadioManagement, then changed back to Communications and Electronics, and finallyRadio and Electronics--with some shiftin responsibilities. There is a basisfor some concern over the potential formisjudgment. Radio for the Fireline recounts many of the problems associatedwith past administrative decisions of alike nature. It is hoped that this history will provide a more thorough understanding of the relationship of telecommunications planning to other ForestService programs, as well as point outa priceless legacy, and a future, whichllwarrants no apology."
53. [D. S,J Nordwall, "Memorandum forthe Record--Radio Laboratory Inspection," 24 March 1947, app., Gaylord A.Knight Collection; F. V. Horton,"Memorandum," 19 May 1946, NationalArchives and Records Service, Seattle,Wash., Box B4266; Harold K. Lawson,interview with the author in KingCity, Ore., May 1978; and W. FrederickBiggerstaff, interview with the authorin Saratoga, Calif., January 1978.
52. Harold K. Steen, The U.S. ForestService: A History (Seattle: universityof Washington Press, 1976), p. 133.
47. Forest Service, Telecommunications,
vo. 3, pp. 5, 6.
48. Forest Service, Telecommunications,vol. 3, p. 7.
49. Forest Service, Telecommunications,vol. 3, pp. 67, 68.
50. Forest Service, Telecommunications,vol. 3, pp. 5, 6.
51. Forest Service, Telecommunications,vol. 3, p. 5.
42. Edward W. Schultz [Deputy Chief,Forest Service, for AdministrationJto Regional Foresters, 5 Ausust 1970,Gaylord A. Knight Collection. Memoincludes roster and agenda.
45. T. R. Hensley, "New Technologyand Its possible Applications," [n. d..J ,typed draft for Telecommunications Study,p. 2, Gaylord A. Knight Collection.
44. Hawkes, lIFinancing, II p. 2.
43. L. E. Hawkes, "Financing a ForestService Telecommunications System,lI20 May 1971, typed rough draft forTelecommunications Study, Gaylord A.Knight Collection.
46. U.S. Department of Agriculture,Forest Service, A study of ForestService Telecommunications, 4 vols.(Washington, D.C.: Government PrintingOffice, 1972).
254
Leader), Valfer, William P. Kennedy,and Miles R. Hall, all of psw;Jack F. Carter, R-5; Karl W. Spelman,R-4; Bill Morton and Tommy R. Hensleyof the Electronics Center; Chester A.Shields, Director, and Lewis E. Hawkes,Administrative Management, N'ashingtonOffice, and Merle s. Lowden, Director,Fire Control, Washington Office.Hawkes had come in from R-3. Otherswere added as the study progressed.
SSp*
HKL, 1932See SP
4 1/2 watts
257
Smokechasers, firescouts, and trail crews
It used a slightlymodified circuit ofSP-1930 (see diagram)
W. Foy Squibb, 1931104$503 MHz1 1/4 watts, c.w., AM,
VFO (set and lock)Regenerative, simplexDry batteries75' Center loaded(see text)5# 9 oz. - 12# complete6 x 7 x 7"
Type p*
I Portable'
Receiver:Power:Antenna:
*Comments:
Designed by:Number produced:Price:FrequencyTransmitter:
Weight:Dimensions:
Principal use:(NA:95G-274971)
Type SP
'Semiportable' Sp·
Lookouts and other temporary locations
Harold K. Lawson, 1931500$1463 MHz1 watt, voice-c.w., AM, VFORegenerative, simplexDry batteries135'/75' Center loaded (see text)20# net, 55# w/batteries9 x 10 X 13 11
Both sets used modified circuit of SP-1930 (see diagram)Type SSP had higher first cost, but lower operating cost
Designed by:Number produced:PriceFrequencyTransmitter:Receiver:Power:Antenna:Weight:Dimensions:
Principal use:
*Comments:
(NA: 95G-274968)
I.-
,ffi'ij!....'c~
~ C" ~
,
-o~ ) ~.,. .., ." ~c
(National Archives:Record Group 95G-262848)
IDeo"'" ""'3" J"" .. "'0DttJ'9"Ca D. 0 L ~t!Cll(,
OJ.1 'or,!" J#"'.C~
COMBINED PORTABLE TRANSMITTER-RECEIVER
256
Schematic Diagram, SP-1930
259
O~s-ign4d byWF. S,?v/bbO~c. /9.:1 / R~yJsv:d.9-27·!l2
/0-K-/59 ",..rll
SCH£MAT/C IJ/AG'RAM
USES PORTABLE RADIO
CI!1
1>/\ 11 <>J;>j \ R8 _::: 00
f- c"," c> a
SCHEMATIC OIAGRAMUS"S $1' IUD/OPHONE
T~
r-1. l g [~r-@ [ M1-,
SJ g~_~J2
~i?' 1\1 0 ;:::nvnIdSP~
~~I~
RJ
J3
258
----------------------
261
. " .
PrOPHONE
u. s ror,sIS~o'I(,t!',..
•
-----'. 00 •
".
" •
.., e ... •
.... . "
" "
~~n l II L~~O leTCJ
~< a~
~zp= ~ RI CI/' 1I ~FC/~
~Iz0
~r----'
~ ~ R. c'r-=
'T 1i.J f ~ )/ rTrI H.
-<:)0
iC'?lr TI T?
l C9 r ;);C 2 01~ OJ ~gO
~g'? ;r; ClO TCIIjg ~ ~
~ H-- ~
IClZ~< .. , ~j;-•
A+ fl RAO/4~ 4S c·l/~ A-/J·e .,. 6'" '44
Type M, Model D
Type M, Nodel C
Schematic Diagram, Type PF
(Forest Service photos, History Section)
(Forest Service photo, History Section)
Type PF
Sometimes advertised as "Portable Fireman"PF Kitbox included heavy-duty batteries
Smokechasers and work crews
Harold K. Lawson/W. Foy Squibb, 1933450$60-$75:> MHz2 1/4 watts, voice-c.w., AM, xtalsRegenerative, simplexDry batteriesCenter loaded, half wave (see text)14-15#4 x 5 x 16"
'Portable Fone'*
*Cornrnents
Principal use:
Designed by:Number produced:Price:Frequency:Transmitter:Receiver:Power:Antenna:\'1eight:Dimensions:
260
W. S. Claypool, 19348Band 82 (RadioLaboratory staff)2300 kHz and 4600 kHz200 watts, 2 channelxtal, voice, AM,simplexHamrnurlund Comet ProGas Engine alternatorl'larine l-1arconiUnknmVll24 x 24 x 12" each
'Boat'
Ship to shore
For use onForest Service patrolboats in Region 10 onlyNo schematic diagramavailable
• 0
\
100 0 ' ~·t---E
00 • - -.
Type B*
Frequency:Transmitter:
Type B
(NA: 95G 305779)
Designed by:Number produced:Hodels:
Principal use:
*Conunents
Receiver:Power:Antenna:Weight:Dimensions:
.. " _".""' K...-ot.
T'YP( ""~PI1ON[
~~~-
., " h" ,. 10
~.
" ~",-J "LT"0
~~ 2" t) "" "
" If':: g,.._.8; -;;:;:-"~,n ':'..'.\'
"to:=:.-.J~',',
"
'~I( ~ •"" 1! I" '" ':::."
IP'":-..,
"
¥* ~ ,;;;;.
I--t-I~ :0:~~
~
~." ,'r.-.0'" ~
~,~.. I--"
l r-:
Type M-~Iodel B
(Forest Service photo, History Section)Schematic Diagram, Type ~I-Model B
______===----------'.,..__263_J
Central station for fire crews and supervisor' 5 headquarters
Model A (2 units) Serial Numbers 1-96
Model B (1 unit) Serial Numbers 97-152
Model C (1 unit) Serial Numbers 154-180
Model D (1 unit) Serial Numbers 181-210
'Medium power'
Harold K. Lawson, 19332lD$290A, B, C. (Belleville), D (Claypool)3 MHz20 watts nominal, voice-c.w., AM, push-to-talk, xtalHammurland Comet Pro and other commercial types; latermodels Forest Service superheterodyne110 volts (a.c.) or gas engine generatorHalf-wave, single wire feeder75-200# depending on model10 x 14 x 22" (transmitter only)
PowerAntenna:\,eightDimensions:
Schematic Diagram, Type M-Model A
Principal use:
*Conunents
Type 1-1*
262
Designed by:Number produced:Price:Models:Frequency:Transmitter:Receiver:
265
._." ,.--1ft.·, ... ~.":-
~ 1 Cl{U.'''I~· 0' ..... (t1l~".1
fOREST .\.t1l\I(.l
TYPE SPF RADIOPHONE"'OOll "I>.
pn...~o ~ cor &. L:rl........ n, •
FIG.2.62
..
II ..'.v
w 0 ...
"
BATTERY CAf!LE.
, qed- ~"'60
l Green. a· 135J l!.rown_ A·4. ~lve~B~,~I.ck.A-
: life I
o , 0 0 011 " 11). I
AMr ~_ or '.llch SWINvmber••re um. a.5 ,nownin di-gr....
II
II
L_ TVNINe _
CAPIiCIlW:
Schematic Diagram, Type SPF-Model AA
'Semiportable Fone'
W. S. Claypool and Laboratory staff, 1935-361200$140A,AA,AB(or BA) ,AO,AE,AF3MHz2 1/4 watts, voice-cow.,AM, xtalSuperheterodyne, simplexDry batteriesHalf-wave--off-centeror end-fed21# wilt. wt. battery,60# w/Kitbox6 1/2 x 9 x 14 1/2"Fire crews and emergencylookoutsPF modified with superheterodyne receiver
Model A Serial Numbers 1-264Model AA Serial Numbers 265-480Model AB Serial Numbers 481-743Model AO Serial Numbers 744-903Model AE Serial Numbers 904-966Model AF Serial Numbers 967-1200A number of additional SPF setswere produced by industry forthe military during World War II(see text)
Type SPF*
*Comments:
Dimensions:Principal use:
vleight:
Receiver:Power:Antenna:
Number produced:Price:Models:Frequency:Transmitter:
Designed by:
Forest Service SPF radio, Model AA(Serial No. 310), front panel
6) .,
264
Type SPF radio installed in carryingbOXi speaker, mike, and headset inhinged section on top.
Type B2
(Forest Service photos, History Section)
267
'N T
10 _lUlU_...." .on"
--_ .. _--- ,------,
SECTION
i
- - - - ~
RECEivER
-
l)YHAMOTOP.
,.
L j
':'" TRANSMITTER powER SUPPLY
FIG. Z,6Z
TRANS~tTTER SECTION
r _"':':'0;;;_0:-::.- -..,- -- ----,, ', : ~_,Jlf'A""'''''~, ,, I,I .,, ', ', 'I ', 'I '~-
Schematic Diagram, Type I-Model A
batteries
AM, xtalw/standby
D
_... ,
Type 1*
A, B, C (Belleville)3 ~rnz, two channel9 1/2 watts, voice-c.w.Superheterodyne, simplex6-volt storage batteryHalf wave, fed off center66# w/accessories, including17 1/2 x 19 1/4 x 12 1/4"
Fire camps and temporary bases
Intermediate in power between SPF and M sets
'Intermediate power'
Radio Laboratory staff, 1937
52$280
'f;
0 • d
•, JI
Ii •
• ~
• ~/j ",
;
(Forest Service photo, History section)
*Comments
Principal use:
Designed by:Number produced:Prince:Models:Frequency:Transmitter:Receiver:Power:Antenna:Weight:Dimensions:
266
...
. .. _ J
MOBILE.ANT UNIT
"~ pol •
U 5 OEPT 01 AGIlICULTUf'!E
FQRES T SERvICE
DRAWING No. 847
269
TYPE t MOBILE RADIOPHONEMODEL 8
SEOI'.l.l 1010 r 28t----==--:."'-=,,~,,=--_.----
SPOKANE RADIO co., INC.SPOl(ilN£ - "'ASH - II S II
'"[-0 (
. ,
CIO l)
CAkE VI[W 0'Pl)1iII'[111 SOCl(U
" 100'00. - ~ -t';.~. ~i'" ~r;
",0
,T...._
_J • ....,.
J; lOTj ...
."'"'
.."':~.
...
c __
Schematic Diagram, Type K (Type I-Mobile)
'Karl
Mobile
(Forest Service photos, History Section)
Type K*
Originally designated Type I-mobile (A and B)Type KA ('Kar-Airplane') was for airplane use
Radio Laboratory staff, 1937
63$270A, B, AA, AB*3 MHz9 1/2 watts, voice, Ml, xtalMotorola Police Cruiser (AA-AB), pushbutton6-volt car batteryRod type on tuning boxFour packages
Principal use:
*Conunents:
•
Designed by:Number produced:Price:Models:Frequency:Transmitter:Receiver:Power:Antenna:Dimensions:
268
271
o
I,·...·
o S
~rWI"
...'·'0
o I 0 0 I 0IZ II 10 I • 7o I 0 0 1 0IZ3456
Reor ... 11 .. 0' "4,r, 1 ... Itch.
Hlllftb.,. or, ••• o••1'10."I" dlo,,.M.
T
SERVICE
S
u.s FOREST
TYPE
• I 7..... -h."
ULHI ... HtGH f1UQUEHCY TR ...HSCEIVU
ow••o~C"CKI,D IVL,W.
-t:l.r
DATI, 1-1-17
0""'WN • Y..i:.!.!..-
SPOKA!'£ RADIO CO. INC.1I1'I"IT ... VI..
• "'K.... I. w....K
R, 10,000 - 01'1191
"2 100,000- of<l'"
R,s .. -otu"
C1 16 - "'M'd
C Z 250 - "'''''d.
C3 pOI7&- ""d.
C.. .004 - ""d.
. C a .00/75-"'fd.
C •.0& 400 yon
T" 0.2"'2'
72- 0142.8
Schematic Diagram, Type S
Interior vie\oJ,Type S
(Forest Service photo,History Section)
Smokechasers, scouts and fire chiefs; occasionallywith moving vehicles
Offset transmitter-receiver frequenciesModel B added separate transmitter tuning control and
slightly more powerOften criticized for spurious signals
Type S*
'Superregenerative'
Harold K. Lawson, 1935781$47A, B*30-40 MHz1/10 watt, voice, AM self-excited oscillator, simplex,transceiverSuperregenerative, tunableDry batteries14' 7" half wave wire or rod type7 x 6 x 11"9# w/batteries
'''llT ,.SPOI"'AtlE PloCH":' CO II.
Principal use:
*Conunents:
(Forest Service photos, History section)
•
Receiver:Power:Antenna:Dimensions:Iqeight:
Designed by:Number produced:Price:Models:Frequency:Transmitter:
'; =:=::::- :~:;VICE
_ ==;:: -;_ ,2CE1\f~:;
5473
" OFFTRANS. REC
? _.l.:lti'
270
Vhf Types
10 MeIers (30-40 MHz)
1
273
::::~;]I'L:o'!'_..-,-,T
V ~ Ot:p..~u ... t ... , 01 "GI\'C.VLTVl'I!:
FO~E5T SERvICE
TYPE T RAOIOPHON~'-'OD!l {.ll.
r.o~ .... e· ..... , '-H .. !O C" l" ,CAll 'v"'" ·~HI
'.
" .~rrR-
0'.,
r------------------~
: T'L :, .,_, II ("j; ~-:'r'---r, I'~' '4 I,' ,
~ , li\ I....P=1-8· "'--f-J-~rv~ IJ rc.f I
~fi' ." 'W :
~1·1r.n~·~0~0~,:~.1.:~-.~~~~~~ i!
:':i:~~';';:~ o~; iI.. .'lfT,~ II ,--" 7!
I uc-, lr,:·~"==t====~U:: '.. or, 'if1" ,L C~C.CL_______ ~
FIG c.62-AlIad10 lidl*.
.~. ,
r r;..1...."'.--,
,.".
I------------~
~ f~./'~·~'"""~·-.:.,.~~r- .......... 'v •••..•
AJ ~.,,"
Schematic Diagram, Type T
J
(Forest Service photos, History Section)
Type T*
'Ten meters'
..
Lookouts and semi-permanent locations
W. Foy Squibb, 1935Numbers included with T-D$130TH-TL; CA, CB, CC30-40 MHz2 1/4 watts, voice, ~1, standby, master oscillatorNational SW-3i superregenerativeDry batteriesHalf wave doublet22 x 15 x 19"29# including batteries and antenna
Spurious signals in receiver led to TH-TL for theseparation of transmitter-receiver channels, thusH is High and L is Low frequency
Model CC operated simplex; CA and CB duplexProvisions to connect to telephone lineRequired 2 frequency assignments for each National ForestNo relationship to Type T-Model D
. iL
'==-t
Principal use:
-~
*Comments:
Designed by:Number produced:Price:~Iodels :Frequency:Transmitter:Receiver:Power:Antenna:Dimensions:Weight:
272
r-!
275
.."
US O[P.... lI.TIoI['lT Of ""lllCULTUR(
FOREST SERVICE
TYPE A RADIOPHONEMODEL A
_6.CKO ~v:.., APPROVEO.(lllJ,WN ISV DL S l),l,Tf .... UQ 4,le37
III
iL~.~.'~"~"~"~~~=LI "IL __ .!!".E~~ _
RECEIVER
fRi-----------,I
,-'OJ (,090 .. 6 -- - 1
I II II '''''1I II ~tTJb--U--..Lh II " II e. II .. '-'" ,- II II II 11~'" ~I go ..... ' l
I ,. ..L~:~:2C·O~~EG[N.OSC~
W)iQR - GENERHOR a rlliER
- -RL I
IIIIIIII
I
Ir l
- 1\ iJ I1-1-
Vl Q!>,C>
FIG.2625CHEflAATIC DIAGRAM
VT 104,C>~[C[IV(;l '&'UOIQ A.MPLlfIER
-;:l Qt ••, :0 t.
.. , ..... ( .....n.s .... f'"
L EXCITER UNIT----------
r~---eru~vy~,--~~"11"' ---fl;.----..,I,.....}- " - ~ I I I I I
Ij:-':I' "It..:: I I ,III II)- ;,;;. b. II "
II t--i~ I;;y .1 =l' II: 'I ,?'I'·'~:~l''"1== II
I., "i"l I Ir;:~~"~Ptt.4' CO'L I
II : I~I P~ II I 'd'''' ,."C'_ 'm
o di'I TlttJotS ....T II ,I. .~~. I I P I I :~. ~ II ... e· ..· e· u 'o;""'T I I ~ Q So T u I I @;- II I I ; ~ I I I $<i~<i I I" II .... ,~'''' .". I I l;r I I II II II ~IL ':::'~~~:;:'I~__ J I ~. ~J L... I~
TRANSMITTER ,~+--
Advertised 5-mile range in unshielded airplaneCould be used with moving vehicles
Air to ground
'Airplane'
Radio Laboratory staff, 193650$26030-40 ~lliz, w/second channel 160-425 kHz3 1/2 watts, voice, AH, xtal push-to-talkRegenerative, w/tuning6-volt battery13' half wave doublet25#, or 40# w/dynamotor18 x 13 x 10 1/2"
(Forest Service photo, History Section)
Type A*
*Cornments
Principal use:
Designed by:Number produced:Price:Frequency:Transmitter:Receiver:Power:Antenna:Weight:Dimensions:
274
Designed by:Number designed:Price:Models:Frequency:Transmitter:Receiver:Power:Antenna:Dimensions:Weight
Principal use:
*Conunents:
276
(Forest Service photo, History Section)
Type U*
'UHF'
Logan Belleville, 1936200$400A30-40 MHz20 watts, voice, ~1, simplexNational superregenerative110 volts (a.c.)Constructed at locations4'9" x 19" x 12"300# (shipping weight)
Central station, fixed base
Speaker on standby, transmitter turned on by lifting handset
from era.dIeNo relationship to U-R/U-T series
Schematic Diagram, t-lodulator and Switching Panel, Type U
277
Type SV*
(Forest S"ervice photo, History Section, 15472)
279
Radio Laboratory staff, 1937-38330$6130-40 ~IHz
1 watt, voice, AM, simplex, self-oscillatingSuperregenerativeDry batteriesThree-quarter wave, single wire6 x 10 x 5" or 12 x 12 x 7" overall18#
Nhere extreme portability was not essential
Independent transmitter/receiver sections
'.
*Comments:
'Superregenerative Variable' Frequency
Principal use:
Designed by:Number produced:Price:Frequency:TransmitterReceiver:Power:Antenna:Dimensions:Weight:
278
Schematic Diagram, RF unit, Type U
281
'f-
1 Ir
-- !
Logan H. Belleville, 1938
Lookouts
630$250D, DA, DB, DE, DF30-40 MHz2 watts, voice, AM, pushto-talk, simplex, xtal osc.Superheterodyne, silentstandbyDry batteriesUSFS Type J or RSMC coaxialskirt dipole7x17x7"30# in shipping case,including batteries
No relationship to earliertype T
Incorporated a calling bell
'.'t r !
Receiver:
Type T-Model D*
Power:Antenna:
Principaluse:
Designed by:Numberproduced:
Price:Models:Frequency:Transmitter:
'Ten meter'
Dimensions:Weight:
*Corrunents:
•,••\1! ~ ~
I ', ~
Schematic Diagram, Type T-Hodel DB
(Forest Service photo, History Section)
c.
SLIf'AL N. $1' J frI sv.10
... """ ofTflIAN&-M.C¥._..
flQ"'f I
~o ~•
flQur. 2
• • • ·(0 0)· •
® (. :O:.j• • E , ·1:- :1
~ • • © • • 0
•
L ..f'\L'
.......nwe-MCV...-
DRAWING NO. 881
.~-lOClOOO""I··"'s• 6 _ 10ClCll0.... •. PC rr• 7 • UIXIClO.... t. 1.:: rr• • _ 100 _'1 ~ . lJlC'l-laeac:l:l421tl-laoo.~
t ) - laeoo 1141'1't , - 1110. CI6OlI6T , • 01:1..... 1'2:LU628peeJl .... o.to'" , )0 ....IPC-l , "1.40" oIooa:. - Q)'fO CI-UIPC-l , -'- ....... _ lIl'!O tl_UkU..,. 'l..IlI - J"H "",p.1,. _11_u...,. .....,_,_ .., elld!:.tep-l.. J.d: _ h&1.., U2""'ro'U-I~"""",p"TlUJId• ..AJC'I'. lioou...... rod..-..l Uli,J·C· IIU","", _ G_U'&1 1-)-'"
Type SV-Hodel A
TI ... ttl "" '"
SPOKAHE RADIO CO., INC.WO.OO'T.
II'OIIIAHl, .AIH. ,/.~. A.~ .•,..LL..L... OO.t.4J.ZI.JL-
~'" !'f.J)a
~...lJoI'"I"""""""""Ll·I1IDW_"'U1......·""It..,....
U. S. DEPARTMENT OF AGRICULrIJREFOREST SERVICE TYPE SV RADIOPHONE
-.E •
• ......,hh ot<>d or puu """ .cc....,'I .. Ie Mu.\Alnod In SpoUn.o,......1t\oIh... Ill. ;)pot..~. I\odlo to., t"e., _foel.o.... of IIlh H\.
TYPE SV PARTS LIST
c: 1 _ L6 -Z. $pMlo.l a-.r1.Wl4c: 2 001 .rd. at_ C-D 1....sD1C ) (0) at•. d.. e.D ll-,rr,c: 4 0015 atOll. -.1_ e-Zl l"'~UC 5 .. 22 .". IIpeo1al -.-rllnlc: • - .CG:l2'5 at4. 1l1_ e-D ~sn~C 7 - .0lII atoll, 1l1c:a C-lI l"'~C • _ .OW' .d. Ill". C.D 1I..~C, _ .0001 -rd. ai.. c-o ~-5n
QO - .CXlOl N'lI. 111 c-o 5....~CU - .0001 .rd. Ill C-D sa-mCl1 ••0001 ald. U. r..o sa-snell ...~ .rd. WI) t. kllor}' "'00C14 - ." ..... XJO , ••Uo.,. "'''''0• 1 - 7loOOO _', i I. UIC "-112-1.lIOCOoh-.,I'.1l'lC1IT_1• ) - UlOOOO _', 'u.lJC 1l_1:'8• 4 - 100000 _. t '. lie: lIt-i
Schematic Diagram,
~A:A'
.. PI,:"
280
283
'.,
, ,
,0 '" c.
Mobile
'Kar UHF'
Converted to semiportable for lookout use and designatedU-R/U-T
Effective squelch and essentially free of ignitioninterference
No relationship to earlier type U
Logan M. 8elleville, 1940575$270R-A; T-A, T-AA, T2; A, 8 in Type U30-40 MHz9 watts, voice, AM, simplex, xtal controlledTunable w/single xtal standby6-volt vehicle batteryQuarter-wave whipHoused in several units (see figure 74 and text)
*Cornments:
Type KU*
Principal use:
Designed by:Number produced:Price:Models:Frequency:Transmitter:Receiver:Power:Antenna:Dimensions:
Type U-R/U-T*(Forest Service photos, History Section)
,.,..---..... t
~
II $ llItMn.rr 0# ~TIM
rOMST Sf:tMCI:
'f}1'#*,/U~
.........--~ .."
IlDS
Specifications varied bymodel
Relay repeater stationsUsed extensively in AWS
programSome use in lookout towersas a receiver
470RA, RB, ROt RF, RG, R-DR,
R-D6T, R-D2T, TRT-F7,R-RS-1630-40MHz
R~dio Laboratory staff,1939-40
~u.,A- c_l-..~~ _l ",.f" ....,./~' ~.,..,.,..!-:JoH>
...."'" "., _J'lJ ._u.
*Comments:
IRelay Repeater Station'
Frequency:
Principaluse:
Numberproduced:
~lodels:
Designed by:
Type RRS*
~-----------------
@. S<.Y"'" ow" pI./r c~""'" "'''''~''·U_I\of _11 (;'/t¥'
••• IJIK__'.f>I-_ A-,"¥ ..,If~ K~ k. _ y-.d
G .~()3(; ""'-'" c , Ao I""",) QU _,,.., ......~ D.,.."."."""
'''J
282
Schematic Diagram, Type RRS Receiver
'ti~~~(Forest Service photo, History Section)
285
..", ._ .0' _.".·.·.'·0
liIOOIEl ..
....__.
......_....,............ """-----.......,_. __ .. _-\I 5 QlN.1l1.,n 01 """'Cu.''''
rORUT S(ltY!G(
TYPE KU-R RECEIVER
00'•• I' C.CMIIC.U' IT " ••~0"'1 .0-11-11.......-...
~V.......
... ..P\..IFIER UNIT
FIG. 2.62
iso........
...........u
UNITTUNIN8
! 'Hffi) I~'I ~
~,prl Iii ;~I • 1,"
•
Schematic Drawing, Type KU-R, Model A, Receiver
.~----
1
.•.
"WI ...lllO ..........KUT-a·I.-'
u ~ «""III'fC'" Of "CiI'!CUI.."'J't(fO"[ST SUtVIC[
TYPE KU-T RADIOPHONEooilIiL •
T......ITTlIlll KeltON
TIUMIMITTtlll 'OWlIt'U~Y
FIG. 2.62
r-------------,
.-
'.'A-------+-.fl
to ._.."...-
~...... _-_.-
_.,-
-
-."""lit
Schematic Drawing, Type KU-T, Model A, Transmitter
284
l
..• .A.__
.......-
287
"'.. • ••,ItT.. ., a. .IlMCU..,.-fOllf." SUVIGl
TYN IX 1tAO.....-,.~-.!~..... •• e 1"."- .... _~~l:...:....:.:.: I '-A-I'-f
..-=-
" ••. 2.12
1!:8L.8 Q ' .
(!)0<! "
Schematic Drawing, Type SX-Model A
SJ was a condensed version of the SX (see figures 75, 76)SXA ("All for attachment) was an audio amplifier accessory
for semiportable use and added $45 to the price of the SXSX replaced type S; SXA replaced type SV
Portable/smoke jumpers
Radio Laboratory staff, 1940-41 (SX/SJ)800/22$70/not available30-40 MHz/34.22 MHz only1/4 watt, voice, AM, 3 xtals/l xtalSuperregenerativeDry batteries/6-l0 hrs. intermittant operationType J/rod type6# 14 oz. net/n.a.13 1/2 x 5 1/2 x 7"/n.a.
'Superregenerative Xtals/Smoke Jumper'
Type SX*/SJ*
Principal use:
Comments:
(NA: 95G-406995)
Designed by:Number produced:Price:Frequency:Transmitter:Receiver:Power:Antenna:Iveight:Dimensions:
286
289
---:::.:0:::'
-'--'1'iT
_ ._...
....
Logan M. Belleville, 1947
Srnokechasers and fire scouts
Related to type S only inmanner of use ("pll for FM)
Latter versions includedtelephone handset as partof carrying handle. A unitwith earphones and sensitive microphone was produced for communicationswith airplanes.
200+Not availableA-T2-R, B-2, C30-40 MHz200 mw, dual channel, FMSuperheterodyne, 1 channelDry batteries7' collapsible rod4 x 6 X 14 11
9# w/batteries
Handie-Talkie with kitbox
Type SF'
*Comments:
Designed by:Numberproduced:
Price:~Iodels :Frequency:Transmitter:Receiver:Power:Antenna:Dimensions:Weight:Principaluse:
.. ,"._ ..-._._, .....,. -,' ..
.•..I ~:.;.:
..-",
~...
,d"" - -m
"""" """"I",
Schematic Diagram, Type SF
Vhf lYpes- FM
(Forest Service photo, History Section)
HOTE
..f\. • OHMS
I( .J\. • 1000 OHMS
Ill.1'\.. I MEGOHMS
'...' (, :'£..":.1-,' ':; " T "r l.:::i~ :'J_' .... ::)£FOREST SERVICE
TYPE SXA RADIOPHONE ATTACHMENTMODEL A
FIG.2.62 '-01' TYPt: SX ',",OIOPHONt,MODEL L
J" .. N"- g.,. G.a c ~s~s RO,OIO LAB ~~WG
R[VISEO· ....Y22'41 CHECK-EO B'( EHS. SXA-A-21-AREVISED- APRIL b:41 00,1 L. MAR.21,1941
',:... --, r-103
1lIASc<L
R-ll, KA.
Rol2O.IIIA
reRMINAL2 VICW
A'•
A- S-
•
l_1=~~~~§~~ 5-12FRONT4 IIICW
288
P-li
Schematic Drawing, Type SXA-Model A
290
(Forest Service photo, History Section)
291
UD O~HOIlE
.Cl:l\ll. '""tOIl -':L A......,.,. __ "_I...... .., ........n f-II_"
n,n,".
t .. .. • .. .. • .. • •
n,
",.. W'~, rlh r#,.~ ~{, '#',C- r#, ~:t- ri. :C M, 'r-";t ~" ~.. "it~ ..S u FJr~ . " . rr '!U .. rr,·· =H'!Y' '•
.; a 1--'-_
.. I'~· . .~,~, 'J' ~~ I iF~ • '!!j;"' •'. ~'- 1,p. '. ii '~ I 'I!r !!-
~
- " - .'." ,..'~.-_. _. .. 0._ .•• .. ---.. --_..... .. ="',"-, .. " - -
n. .'~;Th
.. ".. ., no", -r:~ iiiLrlta: ~'~1: !+: .... ... ~.:- ,...ii, II"': 11,4
r::' . it ~II~ - ~ ~. 'F "" '" i'_" Ii'" ~ "::.". o...
:i';:'l .. {to I-W' ':--"- ~~,1';7 ... ,,,,",.- '",
- :~:
Irr .0. ... ..rr-j: "0
~.~ ,J. ,,!. o., . .. '0
~~'" 1: II
If- oe ". ... 'M ... ' .~. .n".. ',~
~ "-'M
w. ....n. ...
~'O"IIT UItYICl
0 .. TY~E Tf I
Schematic Diagram, Type TF-Model A, Receiver
2 antennas required for all sets to be used asautomatic repeaters
Main circuitry remotely located in magnesium castwea'therproof ene losure
Receiver only is pictured
Type TF*
Lookout FH
Lookouts
Radio Laboratory staff, 1947-48Not availableNot available30-40 HHz2 watts, 2 channel xtal, voice, FM, duplexSuperheterodyne single channelDry batteriesCoaxial or GP13 x 10 x 26" plus battery box60# w/control unit
Principal use:
*Comments
Designed by:Number produced:Price:Frequency:Transmitter:Receiver:Power:Antenna:Dimensions:\'ieight:
293
Type KF*
'Mobile FM'
Mobile
W. F. Biggerstaff, 1947-4810Not availableA-T2-R30-40 MHz25 watts, 2 channel, xtal, FMSuperheterodyne, 1 channel, xtal6-volt auto batteryMobile rod type16 1/2 x 8 1/2 x 15" circuitry3 x 4 1/2 x 2" controls60#
Current drain ... 12 amps on standby, 22 amps to transmitPhoto is of the first commercially produced model ofthis set. It is a RSMC-Type 1147
No photo of Lab prototype available
*Comments:
\'Ieight:
Designed by:Number produced:Price:Models:Frequency:Transmitter:Receiver:PO\ver:Antenna:Dimensions:
Principal use:
OIl.....O' H·t
04tt '-' .•,
••
"'
"'"'
"'
'00
"'
,ot
IO.
IO'
..
,.,
IO'
..
;;1< .!!!..
,.,I'
i""': " 't111~ 11il'~'I:~r ... ' 1\,,,.
i f--iicI-i:rI~j ....~,-.:. ...... la.t"" 1t••H
O~·~~I: "i'" »00 ,....~ . ,.0011\ 1t.1_1
·11', .
L;r .001 .,L• ,.• ~=• ". ,I'- " .. ·1· ...11....... 1\
....... ('HI,I\ It_'ll,.
~"i: n. lJM, ~: '"."G"~II" ;, ,"
;. It·,·,h .0011'
i::To1 ,II .,.
'"- "; :-.I:~ _II •~ !J~\ 1••11.1\ .-ll' ;;.- •.-;:,£~ ~o.IUt ~ ..
-. ,
j1,.104 ''!'fi IHI
!., ",..
C:'ifIl\"~'."'" L-.<>• it .? ." ,
~'; ·(;I~!.3 - J C·U)".OOf
:-JJ ~\. '.11'" "11'U::t:::~O.UIl ~n
~ lIt·1I ;; ~ . -C,o.,~ ,.,~" .. .., . i d• •..., ..",
~~~;§• II'~ :::
~.. ..11' II-II)
;:;;5.... O.UM ~.
~.~~)11·11
·101 .....~
h""'t:Ji ".,tl, 11·110
0.111".1,..
~...1I·ltl',..
.../~,''''I~',..J
-L.. i III·Ill, iIl·IOl
~": ~3 0.111 ~N- ~I~
I~. It·ll'l, Nail-.o. j~ ... o R Y.LKo' r: II-1O)
_ n ...
~ 'O"[ST"- .T. . N TYPE TF R• H" ~
" '" UANSMITrE:ft SE"j ".101 'HOI
C.1Of[" L~ ... 0 ....... , ."YD, ,"(uto IT .0<n,'
It
It
-o"•
!•
!•
··-~ !•
Schematic Diagram, Type TF-Model A, Transmitter
292
-
II
.. .,...:s.... r-+--+-::''/..-
..
..ito U...
..-
'J.1-------.------- ..-
~---~"1
•
..
295
,!-.:.-
------
.....
•
---'
Jr. 1"·!::.;,.....,.I"(1 ... "1<: .... = I <ri:t ~ ._
-.";'.... ,- "j 1!~-;,~~-- ....,::-
~~._-_O__+-, i!;~-;-{ lL.~t:~. t····_~.r-3. I ·U·::J1""';
J t..-------.L----- r-,,".•,-;:....=".=.."n;;-;..;;-;_==....-=-_==--... FIG. 2.62 rc_" SUVIGl
TY"- D nSf Mt_.
..•
..
Schematic Diagram, Test Set, Type D-Model A
Test Set, Type D
(Forest Service photo, History Section,15511)
H-f OS~con.. ASS YPIN VI(W
'IT-I
"'1.1'.2
",,' SAt T
"'
~t+.FA(CT.
I WVlolTR COR..
o PIN VIEW. . ,
"OMl A
~', ,
"
"
FIG.
• ,1,1,1 .Os" BATT
u S OE'AflTIII[NT Of AGRICULTUREFOREST SERVICE
TYPE A TEST SETDRAWN BY [M5 CHECKEO BY Hill
SEPt 28, 1939
IJ.H·f RECT. (froWVWTR COIL l' I
PIN Vl(W 0
'.. l6
SOCKET CONH£CTlOHSTYPE 30
BOTTOIII V.W
u·H-f O~CCOL ASS Y
PIN VIEW
COl. SOCKETT[RWlNAl VIEW
Schematic Diagram,Test Set, Type A-Model A
History Section)
294
Test Equipment
(Forest Service photo,Test Set, Type A
296
DRAWN BY G. B.C. USFS RADIO LAB. DRWG.CHECKED BY H.K.L. C-D-21-ADATE MAY 5.1940
Schematic Diagram, Heterodyne Frequency Heter, Type C-Hodel 0
297
Aircraft Warning System (Service)
American Radio Relay League
Boise Interagency Fire Center
alternating current
American Telephone and Telegraph Co.
continuous wave (used for transmitting signals in Morse code)
audiofrequency
long distance
Civilian Conservation Corps
amplitude modulation (the early form of radio broadcasting)
automatic frequency control
decibel (measure of sound level)
Blister Rust Control
frequency modulation (the later form of radio broadcasting)
Electrical Industries Association
Federal Communications Commission
Forest Products Laboratory
Gaylord A. Knight Collection
General Electric Co.
high frequency
Government Printing Office
hertz (unit of electromagnetic wave frequency; one cycle persecond)
intermediate frequency
Federal Telecommunications System
Government Services Administration
Appendix n
a.c.
af
a.Lc.
AM
ARRL
A. T . & T.
AWS
BIFC
BRC
CCC
c.w.
dB
Ox
EIA
FH
FCC
FPL
FTS
GAK
GE
GPO
GSA
hf
Hz
if
Abbreviations Used in Text and Reference Notes
- "', ...." -
ILB4
...... f
(I'
••
•
"
CI
• •
U. S. DEPARTMENT OF AGRICULTUREFOREST SERVICE
HETERODYNE FREQUENCY IoCE TE RTY"l C .. OOll 0
1-l -4-4-_-+- _
~
~C.
I.'nj~, C'.
/.1::---J' ,~ ~• \ j ~ T
'. = c:.r:~
.,
