Gates Radio Company FM- 20B User manual

INSTRUCTION BOOK
FOR
FM- 20B 20 KW
Fri BRO.JJC_.ST TR.NSMITTER
6/22/61
I .B. # 888 0619 001 G1tiS .1.,-LD I 0 C 112.
Quincy, Illinois

INDEX
o
Specifications
Description
Installation
Unpacking & Reaying for Operation
Theory of Operation
Initial OPerating & Tune- Up Procedure
Matching Into the àmplifier Grid Circuit
Neutralization
1. Driver
2. àmplifier
3. àutomatic Recycle Operation
4. General Information
5. Remote Control Facilities
6. Resetting Overload Relays By Remote
Connections for Using Gates RDC-10C Relaote
Control Unit
1. Studio Unit RDC-10C
2. Remote Controlling the Gates FM- 20
Maintenance
Parts List
'dM -o tkpnal Instruction Books
800 0184 002 Front View
800 0202 001 Rear View
Drawings:
ieM9 001
813 6243 001
,».-35515
hap- 34983 Sheet # 1 only
P-34980 Sheet # 1 only
,F-34982 Sheet # 1 only
.P- 3517O Shoot # 1 only
826 7807 001
826 7887 001
B-67314
B-65503
- M-6023
11-5675
M-6095
Page
1-2
1
4
5
7
9
12
13
14
15
16
17
Control 18
18
19
19
20
1-12
Recycling Unit
Amplifier ( FM)
Exciter ( FM)
ge/,,P,2 00i
B-65555
842 3313 001
D-23127
837 9748 001
842 3276 001
852 5797 001
6/2 2/61
-1-
Fm - 20B

SPECIFIC-TIONS FOR FM- 20B
o
Power Output:
Frequency Range:
R.F. Output Impedance:
Output Fitting:
Type of Oscillr:
Frequency Stability:
Type of Modulation:
Modulation Capabilities:
;iudio Input Impedance:
Audio Input Level:
Frequency Response:
Distortion at 100% Modulation:
Noise:
Harmonic 1;.ttenuation:
Power Input:
20 KW
88 - 108 Mes.
50.0 ohms
3-1/8" En Flange
Direct crystal controlled
+ 0.001%
Phase Shift eiploying pulse
techniques.
+100 KC (+ 75 KC considered 100%
7odulation)
600 ohms
For 100% modulation - + 10 dbm,
+2 db.
Within 1 db of standard 75
microsecond pre- emphasis curve,
or flat + 1 db, 50 to 15,000
cycles, - Whichever is desired
(specified).
1% or less -
0.5% or less
1% or less -
50 to 100 cps.
- 100 to 10 KC
10KC - 15 KC
65 db below 100% modulation ( FM)
50 db below equivalent 100%
(AN) modulation.
;it least 80 db ( ratio of any
single harmonic to c1:2rier).
115 V., 50/60 s ips,
500W. demand.
1 phase,
230 V., 50/60 cps, 1 phase
grounded and neutral 5KV.:i
demand
230 V., 50/60 cps, 3 phase
35 KW consumption at 20KW level
6/2 2/61 - 1-
FM-20B

o
o
Tube Coupleuent:
6
1
- 6;1116
- 12X7
3 - 6J6
2 - 0.2
2 - 6146
1 - 7025
Silicen Rectifier Complement:
2 - S5019
2 - 66-3206
16 - 1N2071
152 - 50KN7
Maximum kltitude:
Maximum A_ubient:
Si z e:
Weight:
2 - 4-400A
1 - 6360
1 - 611q,5
1 - 6080
2 - 4CX10,000D
3 - 6201
7500 feet
45 °C
Width - 84" ( less end bells)
87" ( with end bells)
Depth - 36-1/2"
Height - 78"
2600 lbs. ( approx.) net.
3200 lbs. ( approx.) packed.
6/22/61 - 2-
FM-20B