INTERCHANGEABLE FEED FAMILIES

Seavey Engineering supplies complete sets of high-performance feed systems for large reflectors. These systems typically consist of a multiplicity of interchangeable feeds. Each feed is custom-configured with its own RF chain. The chain may include BIT provisions, filters, LNAs and downconverters. Feeds may also have complex polarization capabilities, such as remote 4-state dual-port switching. In these systems, all feeds are pre-focussed and aligned and have precision common mounting interfaces. Most systems are specified to operate over the full range of frequencies from VHF to Ka-band.

Here are a few typical systems and a list of the Model Numbers of the feeds in each family:

System A is a set of small, lightweight segmented parabolic reflectors with a common F/D ratio and diameters ranging from 2- to 8-feet. Feeds are receive-only and terminate in SMA RF ports.
Frequency, GHz Polarization Feed Model No.
1.5 - 2.0
 Dual Linear ESA-22X/T12
1.50 - 2.50
 Dual Circular ESA-22CX
2.40 - 3.40
 Dual Linear ESA-33/1T12
3.40 - 4.20
 Remote 4-state ESR-40CX/S1
7.10 - 8.40
 Dual Linear ESA-77-2T
10.70 - 13.3
 Dual Linear ESA-1111/T5
12.60 - 15.2
 Dual Linear ESA-1212-2/15T
17.50 - 22.0
 Dual Circular ESA-1818C-2/1T
17.50 - 22.0
 Dual Linear ESA-1818-2/1T

pg104a
Model ESA-1111/T5

pg104b
Model QRA-1020
pg104c
Model QRA-1020C
System B is a fixed site 24-foot parabolic reflector mounted to a precision tracking pedestal. Feeds are receive-only and include all RF components.
Frequency, GHz Polarization Feed Model No.
1.00 - 2.00
 Dual Linear QRA-1020
1.00 - 2.00
 Dual Circular QRA-1020C
1.50 - 2.50
 Dual Linear ESA-22X/STRB
1.50 - 2.50
 Dual Circular ESA-22CX/STRB
2.00 - 4.00
 Dual Circular QRA-2040
2.00 - 4.00
 Dual Circular QRA-2040C
2.40 - 3.40
 Dual Linear ESA-33B/STRB
2.40 - 3.40
 Dual Circular ESA-33BC/STRB
3.40 - 4.20
 Remote 4-state ESR-40CX/STRB
4.00 - 8.00
 Dual Linear QRA-4080
4.00 - 8.00
 Dual Circular QRA-4080C
7.10 - 8.40
 Dual Linear ESA-77-2
7.10 - 8.40
 Dual Circular ESA-77C-22/STRB
8.00 - 12.0
 Dual Linear ESA-88-2/12STR
8.00 - 12.0
 Dual Circular ESA-88C-2/12STR
10.70 - 13.3
 Dual Linear ESA-1111-2/STRB
10.70 - 13.3
 Dual Circular ESA-1111C-2/STRB
12.00 - 18.0
 Dual Circular ESA-1212C/18-STRB
12.60 - 15.2
 Dual Linear ESA-1212/15-STRB
12.60 - 15.2
 Dual Circular ESA-1212C-2/15-STRB
17.50 - 22.0
 Dual Linear ESA-1818-2/STRB
17.50 - 22.0
 Dual Circular ESA-1818C-2/STRB1

pg104d
Model QRA-2040
pg104e
Model ESA-88C-2/12STR
pg104f
Model ESA-1212-2/15-STRB

System C is a fixed site radome-enclosed 60-foot parabolic reflector mounted to a precision pedistal. Feeds provide for transmit capability of several KW average power. All feeds are dual-polarized and remotely switch from dual linear to dual circular.
Frequency, GHz Polarization Feed Model No.
0.20 - 0.50 Remote linear/circular 9162-800-7
0.5 - 2.00 Remote linear/circular 9783-800-1
1.90 - 2.70 Remote linear/circular QRA-2040-1
2.70 - 3.85 Remote linear/circular ESR-33C-3/R
3.95 - 5.85 Remote linear/circular ESR-44C-3/R
5.85 - 8.2 Remote linear/circular ESR-66C-3/R
8.20 - 12.4 Remote linear/circular ESR-88C-3/R
12.40 - 18.0 Remote linear/circular ESR-1212C-3/R

Model QRA-2040-1

Model ESR-33C-3/R

System E (Model AO14-2618L) is a small, portable 14-inch offset reflector with a set of high cross-polarization feeds. All interchangeable feeds have high gain LNA's.
Frequency, GHz Polarization Feed Model No.
2.60 - 3.95 Linear 9851-810
3.95 - 5.85 Linear 9851-820
5.85 - 8.20 Linear 9851-830
8.20 - 12.4 Linear 9851-840
12.40 - 18.0 Linear 9851-850

Model ESR-88C-3/R

Model ESR-1212C-3/R


Model QRA-1020/D


Model ESA-44C-2/2D


Model ESA-77C-2/DN


Model CAF-1111-2/1D

Model ESA-22X/D


Model QRA-4080/D


Model ESA-88/12D
 System D is a transportable, trailer-mounted 20-foot parabolic reflector mounted to a precision tracking pedestal. Feeds are receive-only and include all RF components. Above 12 GHz, all feeds are specially designed to under-illuminate the reflector so that the main beam does not narrow excessively.
Frequency, GHz Polarization Feed Model No.
1.00 - 2.00 Dual Linear QRA-1020/D
1.50 - 2.50 Dual Linear ESA-22X/D
1.50 - 2.50 Dual Circular ESA-22CX/D
2.40 - 3.40 Dual Linear ESA-33B/D
2.40 - 3.40 Dual Circular ESA-33BC/D
3.40 - 4.20 Dual Linear ESA-44-2/2D
3.40 - 4.20 Dual Circular ESA-44C-2/2D
4.00 - 8.00 Dual Linear QRA-4080/D
7.10 - 8.40 Dual Linear ESA-77-2/DN
7.10 - 8.40 Dual Circular ESA-77C-2/DN
8.00 - 12.0 Dual Linear ESA-88/12D
10.70 - 13.3 Dual Linear CAF-1111-2/1D
10.70 - 13.3 Dual Circular CAF-1111C-2/1D
12.00 18.0 Dual Linear CAF-1212-2/18D
12.60 - 15.2 Dual Linear CAF-1212-2/1D
12.60 - 15.2 Dual Circular CAF-1212C-2/1D
17.50 - 22.0 Dual Linear CAF-1818-2/1D
17.50 - 22.0 Dual Circular CAF-1818C-2/1D