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Waveguide Rotary Switches
Rotary Switches

Standard Designs

Waveguide
Size
Freq'y
Range
(GHz)
Isolation
min
(dB)
Insertion
Loss
max
(dB)
VSWR
Max
Power Rating Voltage Operated Electrical
Peak Average Nominal Current
@25°C
Switching time ms
UK 153 IEC
RETMA
typ max
WG8 R22
WR430
1.7-2.6 100 0.01 1.04:1 6MW 8kW 3A 260 400
WG10 R32
WR284
2.6-3.95 100 0.01 1.04:1 3MW 4kW 3A 260 400
WG11a R40
WR229
3.3-4.9 100 0.01 1.04:1 2MW 4kW 3A 160 200
WG12 R48
WR187
3.95-5.85 100 0.01 1.04:1 1MW 4kW 3A 150 200
WG14 R70
WR137
5.85-8.2 100 0.01 1.04:1 500kW 4kW 2A 100 150
WG15 R84
WR112
7.05-10.0 100 0.01 1.04:1 350kW 4kW 2A 100 150
WG16 R100
WR90
8.2-12.4 100 0.01 1.05:1 300kW 3kW 2A 53 100
WG17 R120
WR75
10.0-15.0 100 0.01 1.05:1 300kW 3.5kW 2A 60 100
WG18 R140
WR62
12.4-18.0 100 0.01 1.05:1 125kW 3kW 2A 50 100
WG20 R220
WR42
18.0-26.5 85 0.02 1.05:1 50kW 0.8kW 2A 45 75
WG22 R320
WR28
26.5-40.0 85 0.03 1.06:1 25kW 0.4kW 2A 45 75
WG23 R400
WR22
33.0-50.0 60 0.05 1.1:1 15kW 0.2kW 2A 45 75
WG26 R740
WR12
60.0-90.0 85 0.02 1.1:1 15kW 0.2kW 2A 45 75

Light Weight Designs

Waveguide
Size
Freq'y
Range
(GHz)
Isolation
min
(dB)
Insertion
Loss
max
(dB)
VSWR
Max
Power Rating Voltage Operated Electrical
(DC Voltage = 28V±10%)
Peak Average Nominal Current
@25°C
Switching time ms
UK 153 IEC
RETMA
typ max
WG14 R70
WR137
5.85-8.2 90 0.02 1.04:1 500kW 4kW 4A 60 100
WG15 R84
WR112
7.05-10.0 85 0.02 1.04:1 350kW 4kW 2A 100 150
WG16 R100
WR90
8.2-12.4 80 0.03 1.05:1 300kW 3kW 1A
2A
95
65
130
90
WG17 R120
WR75
10.0-15.0 85 0.03 1.05:1 300kW 3kW 1A
2A
95
65
130
90
WG18 R140
WR62
12.4-18.0 85 0.03 1.06:1 125kW 2kW 1A
2A
55
35
100
60
WG25 R620
WR15
50.0-75.0 80 0.15 1.1:1 10kW 0.1kW 2A 40 50

Type Numbering

A switch is specified either by a MESL alpha-numeric part number or by a numeric one which is cross-referred to a customer specification. A MESL part number has the following format:

16-42EDS/P/O/C/D
 
16WAVEGUIDE SIZE
The British Standard numbering of waveguide sizes is used. A conversion table to other designations and frequency is provided.
42SWITCH CONFIGURATION
The switch configuration is dictated by the number of ports incorporated in the switch stator and the number of channels through the switch rotor. The most common switch is the 4 port - 2 channel type (42). This is also known as a 'transfer' or DPDT switch. A 4 port - 2 channel can be configured as a 3 port - 2 channel (32) or SPDT switch by terminating one of the ports.
EFLANGES
The switches can accommodate any appropriate series of flange. The two standard series of flanges supplied by MESL are:- 'N' Series -- British mating flange with UNC threads. 'E' Series -- European 154-IEC mating flanges with metric threads.
DSACTUATOR MECHANISM
(1) A manual switch has no designation.
(2) An electrically driven switch has one of the following designations.
(a) LATCHING SWITCHES. These use either, two solenoids, or a brushless motor and the letters 'DS' and 'BM' are used, respectively.
(b) FAIL SAFE SWITCHES. These use a single solenoid and the designating letters are 'FS'. The 'FS' holding current is typically 300mA.
(c) LARGE ROTOR SWITCHES. These are switches for waveguide sizes 11A and larger. They employ two solenoids in conjunction with a 'Geneva Mechanism'. They are denoted by the letter 'B' and have the same drive circuit as a 'DS' switch.
P

POSITION INDICATION
'P' A simple tell-back facility, using a maximum of three micro-switches can be provided to indicate the position of the switch. This option is incorporated in a Fail Safe Switch and is not specified separately.

OMANUAL OVERRIDE
'O' All electrically operated, latching, switches can be fitted with a means of setting the switch by hand to one of its positions .This option is never fitted to the Fail Safe Switches.
CCIRCUIT INTERRUPT
'C' Electrically operated switches require a voltage pulse to change their state. This should be long enough to drive the switch firmly to the next home position and then be removed. If only a constant power source can be provided, or as a safety precaution, the fitting of this internal option ensures that the drive voltage will be removed when the home position has been reached. This option is incorporated in a Fail Safe Switch and is not specified separately.
DDIODE PROTECTION
'D' This option provides for the fitting of diodes across the drive motor supply lines to suppress the back e.m.f. generated. It is fitted automatically if the Circuit Interrupt option is selected and in those circumstances it does not need to be specified.
-PRESSURISATION
This is considered a special option and there is no designation letter. A low pressure of between 2 and 5 p.s.i. can easily be provided. It may be possible to give special consideration for a higher pressure to permit the switch to be operated at a higher peak power level than those specified for the waveguide size.
-KEYLOCK
This is considered a special option and there is no designation letter. For security or safety purposes this option will allow the switch to be manually locked in any position. The status of the lock can be monitored by circuitry in this option.

Waveguide Frequency Range and Designation

Frequency Range (GHz) Waveguide Designations
UK Standard European
153-IEC
USA
RETMA
1.14 - 1.73 WG 6 R14 WR 650
1.45 - 2.20 WG 7 R 18 WR 510
1.72 - 2.61 WG 8 R 22 WR 430
2.60 - 3.95 WG 10 R 32 WR 284
3.22 - 4.90 WG 11A R 40 WR 229
3.94 - 5.99 WG 12 R 48 WR 187
4.64 - 7.05 WG 13 R 58 WR 159
5.38 - 8.17 WG 14 R 70 WR 137
6.57 - 9.99 WG 15 R 84 WR 112
8.20 - 12.5 WG 16 R 100 WR 90
9.84 - 15.0 WG 17 R 120 WR 75
11.9 - 18.0 WG 18 R 140 WR 62
14.5 - 22.0 WG 19 R 180 WR 51
17.6 - 26.7 WG 20 R 220 WR 42
21.7 - 33.0 WG 21 R 260 WR 34
26.4 - 40.0 WG 22 R 320 WR 28
32.9 - 50.1 WG 23 R 400 WR 22
39.2 - 59.6 WG 24 R 500 WR 19
49.8 - 75.8 WG 25 R 620 WR 15
Registered Office:
MESL Microwave Limited, Lochend Industrial Estate, Newbridge, Edinburgh, EH28 8LP, Scotland
Tel: 0131 333 2000 | Fax: 0131 333 3607 | Registered in Scotland Number: SC074001