Collins Mechanical filters

Collins Mechanical filters ... COLLINS MECHANICAL FILTERS This data listing should be read in conjunction with the WA3KEY filter ...
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COLLINS MECHANICAL FILTERS

I derived this data from an original posting to the Collins Reflector by Carles Kinsolving, Thursday 3 September 1998.

This file contains data on Collins Radio mechanical filters, taken from a photocopy of a Collins brochure supplied by Wally Chambers, K5OP.
Filters are divided into three categories: Symmetrical Bandpass, Single Sideband, and Voice Multiplex Sideband. The brochure gives their Newport Beach, California plant as a contact point for additional information (I doubt this plant still exists).

My notes indicate that someone once told me that the input impedance varies from 1 K ohm to 50 K ohms, depending on model. Some models apparently had output impedances that did not match input impedance. The devices ARE bilateral. The note also says that the bias magnet determines the filter noise characteristics. Therefore, avoid DC on windings; if absolutely necessary, the maximum DC current is 3 ma. (This conflicts with the 2 ma max. shown for the F455FB-21 mentioned below.)

There is an excellent series of articles on mechanical filters in the June, July, and August 1953 issues of QST. They are titled "Magnetostriction Devices and Mechanical Filters for Radio Frequencies", written by Walter Van B. Roberts, W2CHO.
See the end of this file for a description of the F455FB-21 filter intended for amateur use.
All filters are *standard* Collins filter types; special requirements were to be submitted to Collins when required.

The Collins Mechanical Filters, designed to meet the environmental requirements of MIL-STD specs, are contained in small, hermetically sealed brass cases finished with Type VI, Class 2 nickel plate in accordance with Federal Specification QQ-N-290. The Filters thus withstand humidity tests, corrosion resistance tests and operation at extreme altitudes. Interior construction is such that the Filters withstand vibration in accordance with MIL-STD-202A, Method 201A.(Three impact shocks of 15 G's magnitude applied in each direction perpendicular to the three principal axes for a total of 18 shocks!) Filters will meet general performance requirements over the temperature range of -40C to +85C with the following maximum allowable deviation limits from the specified +25C requirements:

Center Frequency............... 10PPM/degree C
Bandwidth...................... +/-5%
Peak-to-Valley Ratio........... 1 dB increase
Transfer Impedance............. +/- 10%

The brochure also mentions: Collins F455T-150 and F455W-150 Minifilters. Available in a cylindrical brass case less than 0.1 cubic inch in volume (1 1/2 inch long, 1/4 inch diameter) or a molded rectangular plastic case. Center frequency: 455 kHz nominal. Frequency response: bandwidth, 6 dB attenuation, 15 kHz nominal; bandwidth 60 dB attenuation, 30 kHz maximum. Source and load impedance: 70,000 ohms. Passband ripple: 2 dB maximum. Operating temperature range: -40 to + 85 degrees C.

CASE STYLES: I'll take a crack at this, but you really ought to look at something like the Surplus Sales of Nebraska catalog to see what they look like.
Bathtub style, with cover obviously soldered on. Rectangular, 3.12 long x 1.0 wide x 1.0 high. Two threaded studs and four solder lugs on one side. Studs 1.531 apart. Input lugs separated from output lugs by 3.0; each pin pair separated 0.486.

W - Cylindrical, flange at one end, solder lugs (hooks) at both ends. Cylinder 4 long, 3/4 diameter. Two lugs at flanged end, 3 lugs (1 ground) at other.

E - Bathtub style, 2 13/16 long x 15/16 wide x 1 high. Two guide pins, four contact pins (mates with socket). Guide pins 1.531 apart, contact pin pairs 2.375 apart, each pair of pins separated by 0.486.

F - Bathtub style, same dimensions as E type, but threaded studs and solder lugs instead of guide pins and contact pins.

H - Cylindrical, flange at one end, four solder lugs at the same end. 2 3/4 long, 0.775 diameter.

J - Cylindrical, no flange, pins on one end fit standard 9-pin tube socket. 2 3/4 long, 0.775 diameter.

K - Cylindrical, flange part-way up the side, three solder lugs on each end. 2 7/8 long, 0.775 diameter.

Y - Cylindrical, two solder lugs one end, three lugs (1 ground) on other end. 2 13/16 long, 7/16 diameter. Flat surface mounting bracket is 591-0613-002. Feedthru mounting bracket is 591-0615-002. Tube socket adapter (feedthru) is 591-0617-002.

Fc................. Center Frequency (kHz)
Type............... Collins filter model
Part Number........ Collins part number
Nom. B.W. ......... Nominal Bandwidth (kHz)
Max. B.W. ......... Maximum Bandwidth (kHz @ 60 dB)
Case Style ........ Type of case

SYMMETRICAL BANDPASS FILTERS:

Fc Type Part Number Nom. B.W. Max. B.W. Case Style ----- ----------- ------------ ---------- --------- ---------- 142 F142Y-15 526-9566-001 1.5 @ 6 dB 3.75 Y-3 200 F200A-10/30 526-9098-000 1.0 @ 6 dB 3.00 (Special 3.0 @ 6 dB 6.90 Dual) 200 F200L-10 526-9409-000 1.0 @ 6 dB 3.0 K (special) 200 F200L-10A 526-9520-001 1.0 @ 6 dB 3.0 K (special) 200 F200Y-23 526-9567-001 2.0 @ 3 dB 4.8 Y-2.8 200 F200Y-60 526-9487-000 6.0 @ 6 dB 13.0 Y (long) 205 F205Y-23 526-9568-001 2.0 @ 3 dB 4.8 Y-2.8 235 F235F-80R 526-9557-001 8.0 @ 3 dB 20.0 (@40dB) F 245.0 F245Q-1 526-9345-000 0.5 @ 3 dB 1.5 (@50dB) H (special) 245.5 F245Q-2 526-9346-000 0.5 @ 3 dB 1.5 (@50dB) H (special) 250 F250Q-1 526-9347-000 0.5 @ 3 dB 1.5 (@50dB) H (special) 250 F250Q-07 526-9484-000 0.7 @ 6 dB 2.5 H (special) 250 F250A-20 526-9012-00 2.0 @ 6 dB 4.3 C 250 F250C-27 526-9514-001 2.7 @ 6 dB 4.5 (@40dB) C 250 F250Z-3 526-9080-000 2.7 @ 6 dB 4.5 (@40dB) K (special) 250 F250X-4 526-9218-000 2.85 @ 3 dB 6.0 (@65dB) L-3 7/8 250 F250A-67 526-9039-000 6.7 @ 6 dB 14.0 C 250 F250F-80R 526-9558-001 8.0 @ 3 dB 20 (@40dB) F 250 F250A-85 526-9049-000 8.5 @ 6 dB 18.0 C 250 F250F-100 526-9410-000 10.0 @ 6 dB 20.0 (@40dB) F 265 F265F-80R 526-9559-001 8.0 @ 3 dB 20.0 (@40dB) F 300 F300K-05 526-9589-010 0.5 @ 6 dB 1.1 K 300 F300C-68 526-9477-00 6.5 @ 6 dB 10.8 C 300 F300X-68 526-93307-00 6.5 @ 6 dB 10.8 L (special) 450 F450Y-60 526-9643-010 6.0 @ 6 dB 26.0 Y 452 F452FA-21 526-9628-010 2.1 @ 6 dB 5.3 FA 453 F453Q-06 526-9627-010 0.7 @ 12 dB N/A Y-3 1/4 455 F455E-05 526-9321-00 0.5 @ 6 dB 2.5 E 455 F455F-05 526-9318-00 0.5 @ 6 dB 2.5 F 455 F455FA-05 526-9494-00 0.5 @ 6 dB 2.5 FA 455 F455H-05 526-9229-00 0.5 @ 3 dB 2.5 H 455 F455J-05 526-9154-00 0.5 @ 3 dB 2.5 J 455 F455K-05 526-9228-00 0.5 @ 3 dB 2.5 K 455 F455M-05 526-9614-010 0.54 @ 3 dB 3.4 M 455 F455Q-5 526-9367-00 0.5 @ 6 dB 2.5 L-2 29/32 455 F455Q-8 526-9393-00 0.5 @ 6 dB 2.5 J 455 F455Y-05 526-9521-001 0.5 @ 6 dB 3.0 Y (long) 455 F455FB-05 526-9530-001 0.54 @ 3 dB 3.1 FA 455 F455F-08 526-9085-00 0.8 @ 6 dB 2.0 F 455 F455FA-08 526-9446-00 0.8 @ 6 dB 4.0 FA 455 F455J-08 526-9090-00 0.8 @ 6 dB 2.6 J 455 F455F-085 526-9610-010 0.850 @ 6 dB 4.5 F 455 F455E-15 526-9370-00 1.5 @ 6 dB 3.5 E 455 F455E-15S 526-9571-010 1.5 @ 6 dB 18.0 E 455 F455F-15 526-9227-00 1.5 @ 6 dB 3.5 F 455 F455FA-15 526-9495-00 1.5 @ 6 dB 3.5 FA 455 F455H-15 526-9170-00 1.5 @ 6 dB 3.5 H 455 F455J-15 526-9155-00 1.5 @ 6 dB 3.5 J 455 F455K-15 526-9168-00 1.5 @ 6 dB 3.5 K 455 F455Q-6 526-9379-00 1.5 @ 6 dB 3.5 J (short) 455 F455Y-15F 526-9638-010 1.5 @ 6 dB 3.5 Y 455 F455NL-20 526-9562-001 2.2 @ 6 dB 11.5 K (special) 455 F455Q-2 526-9309-00 2.0 @ 6 dB 5.6 Y 455 F455E-21 526-9322-00 2.1 @ 6 dB 5.3 E 455 F455F-21 526-9323-00 2.1 @ 6 dB 5.3 F 455 F455FA-21 526-9427-00 2.1 @ 6 dB 5.3 FA 455 F455FC-21 526-9564-001 2.0 @ 6 dB 7.5 (@50dB) FA 455 F455H-21 526-9313-00 2.1 @ 6 dB 5.3 H 455 F455J-21 526-9156-00 2.1 @ 6 dB 5.3 J 455 F455K-21 526-9317-00 2.1 @ 6 dB 5.3 K 455 F455N-20 526-9163-00 2.1 @ 6 dB 5.3 K (special) 455 F455Y-21 526-9337-00 2.1 @ 6 dB 5.3 Y 455 F455FA-27 526-9500-00 2.9 @ 6 dB 6.5 FA 455 F455E-31 526-9074-00 3.1 @ 6 dB 6.5 E 455 F455F-31 526-9075-00 3.1 @ 6 dB 6.5 F 455 F455FA-31 526-9496-00 3.1 @ 6 dB 6.5 FA 455 F455H-31 526-9093-00 3.1 @ 6 dB 6.5 H 455 F455J-31 526-9089-00 3.1 @ 6 dB 6.5 J 455 F455K-31 526-9338-00 3.1 @ 6 dB 6.5 K 455 F455Q-7 526-9380-00 3.1 @ 6 dB 6.5 J 455 F455Y-31 526-9338-00 3.1 @ 6 dB 6.5 Y (See F455K-31 -- is this Collins typo?) 455 F455E-40 526-9324-00 4.0 @ 6 dB 8.5 E 455 F455F-40 526-9325-00 4.0 @ 6 dB 8.5 F 455 F455FA-40 526-9497-00 4.0 @ 6 dB 8.5 FA 455 F455H-40 526-9326-00 4.0 @ 6 dB 8.5 H 455 F455J-40 526-9327-00 4.0 @ 6 dB 8.5 J 455 F455K-40 526-9303-00 4.0 @ 6 dB 8.5 K 455 F455N-40 526-9160-00 4.0 @ 6 dB 8.5 K (special) 455 F455Y-40 526-9339-00 4.0 @ 6 dB 8.5 Y 455 F455Y-40F 526-9639-010 4.0 @ 6 dB 8.5 Y 455 F455E-60 526-9084-00 6.0 @ 6 dB 12.6 E 455 F455F-60 526-9087-00 6.0 @ 6 dB 12.6 F 455 F455FA-60 526-9498-00 6.0 @ 6 dB 12.6 FA 455 F455FC-60 526-9522-001 6.0 @ 6 dB 25.9 FA 455 F455H-60 526-9094-00 6.0 @ 6 dB 12.6 H 455 F455J-60 526-9091-00 6.0 @ 6 dB 12.6 J 455 F455K-60 526-9159-00 6.0 @ 6 dB 12.6 K 455 F455Y-60 526-9340-00 6.0 @ 6 dB 12.6 Y 455 F455E-80 526-9332-00 8.0 @ 6 dB 18.5 E 455 F455E-80S 526-9569-010 8.0 @ 6 dB 20.0 E 455 F455F-80 526-9331-00 8.0 @ 6 dB 18.5 F 455 F455H-80 526-9330-00 8.0 @ 6 dB 18.5 H 455 F455J-80 526-9329-00 8.0 @ 6 dB 18.5 J 455 F455K-80 526-9328-00 8.0 @ 6 dB 18.5 K 455 F455N-80 526-9161-00 8.0 @ 6 dB 18.5 K (special) 455 F455Y-80 526-9341-00 8.0 @ 6 dB 18.5 Y 455 F455E-120 526-9336-00 12.0 @ 6 dB 23.0 E 455 F455F-120 526-9173-00 12.0 @ 6 dB 23.0 F 455 F455FA-120 526-9563-001 12.0 @ 6 dB 30.0 FA 455 F455H-120 526-9171-00 12.0 @ 6 dB 23.0 H 455 F455J-120 526-9333-00 12.0 @ 6 dB 23.0 J 455 F455K-120 526-9316-00 12.0 @ 6 dB 23.0 K 455 F455Y-120 526-9342-00 12.0 @ 6 dB 23.0 Y 455 F455YA-120A 526-9489-001 12.0 @ 6 dB 30.0 Y 455 F455YA-120B 526-9629-010 12.0 @ 6 dB 30.0 Y 455 F455T-150 526-9649-010 15.0 @ 6 dB 30.0 T 455 F455W-150 526-9642-010 15.0 @ 6 dB 30.0 W 455 F455E-160 526-9320-00 16.0 @ 6 dB 27.5 E 455 F455F-160 526-9335-00 16.0 @ 6 dB 27.5 F 455 F455H-160 526-9314-00 16.0 @ 6 dB 27.5 H 455 F455J-160 526-9334-00 16.0 @ 6 dB 27.5 J 455 F455K-160 526-9315-00 16.0 @ 6 dB 27.5 K 455 F455N-160 526-9162-00 16.0 @ 6 dB 38.0 K (special) 455 F455Y-160 526-9343-00 16.0 @ 6 dB 27.5 Y 455 F455Y-330 526-9607-010 33.0 @ 6 dB 60.0 Y 455 F455E-350 526-9371-00 35.0 @ 6 dB 62.0 E 455 F455F-350 526-9180-00 35.0 @ 6 dB 62.0 F 455 F455H-350 526-9302-00 35.0 @ 6 dB 62.0 H 455 F455J-350 526-9300-00 35.0 @ 6 dB 62.0 J 455 F455K-350 526-9186-00 35.0 @ 6 dB 62.0 K 455 F455Y-350 526-9344-00 35.0 @ 6 dB 62.0 Y 455 F455Y-350A 526-9582-010 35.0 @ 6 dB 60.0 Y 455 F455Q-3 526-9310-00 40.0 @ 6 dB 140.0 Y 455.7 F455Q-05 526-9305-00 0.5 @ 6 dB 2.1 H, J, or K 500 F500Y-01S 526-9556-001 0.15 @ 2 dB 8.0 (@40dB) Y 500 F500B-08 526-9007-00 0.8 @ 6 dB 3.5 E 500 F500Y-08CW 526-9588-010 0.8 @ 3 dB 3.0 Y 500 F500B-14 526-9030-00 1.4 @ 6 dB 3.8 E 500 F500F-14 526-9215-00 1.4 @ 6 dB 3.5 F 500 F500B-31 526-9008-00 3.1 @ 6 dB 7.5 E 500 F500F-31 526-9408-00 2.2 @ 3 dB 8.0 F 500 F500Y-31 526-9426-00 3.1 @ 6 dB 8.0 Y 500 F500Y-31S 526-9453-00 3.1 @ 6 dB 8.0 Y 500 F500B-60 526-9009-00 6.0 @ 6 dB 14.0 E 500 F500F-60 526-9319-00 6.0 @ 6 dB 19.0 F 500 F500M-60 526-9621-010 6.0 @ 6 dB 14.0 M 500 F500Y-60 526-9378-00 6.0 @ 6 dB 13.2 Y 500 F500Y-70 526-9421-00 7.0 @ 6 dB 19.0 Y (flange) 500 F500Y-80F 526-9646-010 8.0 @ 3 dB 20.0 Y (special) 500 F500E-94 526-9472-00 9.4 @ 6 dB 19.0 E 500 F500F-94 526-9216-00 9.4 @ 6 dB 19.0 F 500 F500Y-94S 526-9468-00 9.4 @ 6 dB 19.0 Y 500 F500Y-120 526-9575-00 12.0 @ 6 dB 26.0 Y 500 F500M1-60 526-9617-010 6.0 @ 3 dB 14.0 M (may be F500MI-60; faded print) 500 F500Y-500 526-9418-00 50.0 @ 6 dB 86.0 Y 501 F501Y-05F 526-9647-010 0.5 @ 6 dB 5.5 Y (special)

SINGLE SIDEBAND FILTERS:

Fc Type Part Number Sideband Nom. B.W. Case Style ----- ----------- ------------ -------- ------------ ------------ 220 F220Z-30 526-9580-010 lower 3.0 @ 6 dB Y3 250 F250Z-4 526-9130-00 upper 2.85 @ 3 dB C 250 F250Z-4 526-9130-021 upper 2.90 @ 3 dB C 250 F250Z-4 526-9130-031 upper 3.40 @ 3 dB C 250 F250Z-5 526-9131-00 lower 2.85 @ 3 dB C 300 F300Z-4 526-9312-00 upper 2.65 @ 2.5 dB L (special) 300 F300Z-5 526-9311-00 lower 2.65 @ 2.5 dB L (special) 300 F300Z-6 526-9363-00 upper 5.65 @ 2.5 dB L (special) 300 F300Z-7 526-9362-00 lower 5.65 @ 2.5 dB L (special) 300 F300Z-8 526-9416-00 upper 2.55 @ 3 dB L (special) 300 F300Z-9 526-9417-00 lower 2.55 @ 3 dB L (special) 300 F300Z-10 526-9428-00 upper 2.7 @ 1.5 dB L (special) 300 F300Z-11 526-9429-00 lower 2.7 @ 1.5 dB L (special) 450 F450Z-1F 526-9634-010 upper 2.45 @ 2.0 dB Y (2 3/4) 455 F455Z-1 526-9095-00 upper 2.7 @ 3 dB H 455 F455Z-2 526-9096-00 lower 2.7 @ 3 dB H 455 F455Z-4 526-9364-00 upper 2.7 @ 3 dB Y (long) 455 F455Z-4 526-9364-011 upper 2.7 @ 3 dB F 455 F455Z-4 526-9364-021 upper 2.6 @ 3 dB Y (long) 455 F455Z-4 526-9364-031 upper 3.4 @ 3 dB Y (long) 455 F455Z-4 526-9364-041 upper 2.7 @ 3 dB E 455 F455Z-5 526-9365-00 lower 2.7 @ 3 dB Y (long) 455 F455Z-5 526-9365-011 lower 2.7 @ 3 dB F 455 F455Z-5 526-9365-021 lower 3.4 @ 3 dB Y (long) 455 F455Z-5 526-9365-031 lower 3.1 @ 3 dB Y (long) 455 F455Z-5 526-9365-041 lower 2.7 @ 3 dB E 455 F455Z-5B 526-9578-010 lower 2.7 @ 3 dB Y (long) 455 F455Z-6 526-9368-00 upper 1.7 @ 3 dB Y (long) 455 F455Z-10 526-9445-00 upper 3.3 @ 3 dB Y 455 F455Z-12 526-9486-00 upper 1.2 @ 3 dB Y 455 F455Z-14 526-9527-001 upper 5.46 @ 3 dB F 455 F455Z-15 526-9528-001 lower 5.46 @ 3 dB F 455 F455Z-16 526-9605-010 upper 1.7 @ 3 dB FA 455 F455Z-16 526-9605-020 upper 1.7 @ 3 dB FA (special) 455 F455Z-17 526-9606-010 lower 1.7 @ 3 dB FA 455 F455Z-17 526-9606-020 lower 1.7 @ 3 dB FA (special) 455 F455Z-18L 526-9625-010 lower 1.7 @ 3 dB Y (long) 455 F455Z-19F 526-9630-010 lower 2.8 @ 2 dB Y (long) 455 F455Z-20F 526-9640-010 lower 2.1 @ 2 dB Y (long) 455 F455Z-21F 526-9641-010 upper 2.1 @ 2 dB Y (long) 455 F455Z-22F 526-9648-010 upper 2.8 @ 1.5 dB Y (special) 455 F455Z-23F 526-9586-010 lower 2.8 @ 1.5 dB Y (long) 500 F500Z-4 526-9377-00 upper 2.7 @ 3 dB Y 500 F500Z-4C 526-9579-010 upper 3.0 @ 3 dB Y 500 F500Z-5 526-9376-00 lower 2.7 @ 3 dB Y 500 F500Z-6 526-9412-00 upper 2.75 @ 1.5 dB Y 500 F500Z-7 526-9413-00 lower 2.75 @ 1.5 dB Y 500 F500Z-8 526-9414-00 upper 2.4 @ 3 dB Y 500 F500Z-9 526-9415-00 lower 2.4 @ 3 dB Y 500 F500Z-10 526-9420-00 upper 3.2 @ 3 dB Y (flanged) 500 F500Z-11 526-9419-00 lower 3.2 @ 3 dB Y (flanged) 500 F500Z-12 526-9422-00 upper 2.75 @ 3 dB Y 500 F500Z-13 526-9423-00 lower 2.75 @ 3 dB Y 500 F500Z-14 526-9424-00 upper 2.4 @ 4 dB Y 500 F500Z-15 526-9425-00 lower 2.4 @ 4 dB Y 500 F500Z-16 526-9481-00 upper 8.0 @ 3 dB Y 500 F500Z-17 526-9480-00 lower 8.0 @ 3 dB Y 500 F500Z-18F 526-9644-010 upper 3.0 @ 3 dB Y (special) 500 F500Z-19F 526-9645-010 lower 3.0 @ 3 dB Y (special)

VOICE MULTIPLEX SIDEBAND FILTERS:

Note: All these filters are lower sideband, case style L.

Fc Type Part Number Nom. B.W.
----- ----------- ------------ ------------
64 F64Z-7 526-9396-000 2.9 @ 1.5 dB 68 F68Z-7 526-9397-000 2.9 @ 1.5 dB 72 F72Z-7 526-9398-000 2.9 @ 1.5 dB 76 F76Z-7 526-9399-000 2.9 @ 1.5 dB 80 F80Z-7 526-9400-000 2.9 @ 1.5 dB 84 F84Z-7 526-9401-000 2.9 @ 1.5 dB 88 F88Z-7 526-9402-000 2.9 @ 1.5 dB 92 F92Z-7 526-9403-000 2.9 @ 1.5 dB 96 F96Z-7 526-9404-000 2.9 @ 1.5 dB 100 F100Z-7 526-9405-000 2.9 @ 1.5 dB 104 F104Z-7 526-9406-000 2.9 @ 1.5 dB 108 F108Z-7 526-9407-000 2.9 @ 1.5 dB 64 F64Z-7A 526-9631-010 2.4 @ 0.25 dB 68 F68Z-7A 526-9631-020 2.4 @ 0.25 dB 72 F72Z-7A 526-9631-030 2.4 @ 0.25 dB 76 F76Z-7A 526-9631-040 2.4 @ 0.25 dB 80 F80Z-7A 526-9631-050 2.4 @ 0.25 dB 84 F84Z-7A 526-9631-060 2.4 @ 0.25 dB 88 F88Z-7A 526-9631-070 2.4 @ 0.25 dB 92 F92Z-7A 526-9631-080 2.4 @ 0.25 dB 96 F96Z-7A 526-9631-090 2.4 @ 0.25 dB 100 F100Z-7A 526-9631-100 2.4 @ 0.25 dB 104 F104Z-7A 526-9631-110 2.4 @ 0.25 dB 108 F108Z-7A 526-9631-120 2.4 @ 0.25 dB 64 F64Z-7B 526-9631-130 3.1 @ 0.5 dB 68 F68Z-7B 526-9631-140 3.1 @ 0.5 dB 72 F72Z-7B 526-9631-150 3.1 @ 0.5 dB 76 F76Z-7B 526-9631-160 3.1 @ 0.5 dB 80 F80Z-7B 526-9631-170 3.1 @ 0.5 dB 84 F84Z-7B 526-9631-180 3.1 @ 0.5 dB 88 F88Z-7B 526-9631-190 3.1 @ 0.5 dB 92 F92Z-7B 526-9631-200 3.1 @ 0.5 dB 96 F96Z-7B 526-9631-210 3.1 @ 0.5 dB 100 F100Z-7B 526-9631-220 3.1 @ 0.5 dB 104 F104Z-7B 526-9631-230 3.1 @ 0.5 dB 108 F108Z-7B 526-9631-240 3.1 @ 0.5 dB 64 F64Z-7C 526-9631-250 2.9 @ 1.0 dB 68 F68Z-7C 526-9631-260 2.9 @ 1.0 dB 72 F72Z-7C 526-9631-270 2.9 @ 1.0 dB 76 F76Z-7C 526-9631-280 2.9 @ 1.0 dB 80 F80Z-7C 526-9631-290 2.9 @ 1.0 dB 84 F84Z-7C 526-9631-300 2.9 @ 1.0 dB 88 F88Z-7C 526-9631-310 2.9 @ 1.0 dB 92 F92Z-7C 526-9631-320 2.9 @ 1.0 dB 96 F96Z-7C 526-9631-330 2.9 @ 1.0 dB 100 F100Z-7C 526-9631-340 2.9 @ 1.0 dB 104 F104Z-7C 526-9631-350 2.9 @ 1.0 dB 108 F108Z-7C 526-9631-360 2.9 @ 1.0 dB 64 F64Z-8A 526-9454-000 2.4 @ 0.5 dB 68 F68Z-8A 526-9455-000 2.4 @ 0.5 dB 72 F72Z-8A 526-9456-000 2.4 @ 0.5 dB 76 F76Z-8A 526-9457-000 2.4 @ 0.5 dB 80 F80Z-8A 526-9458-000 2.4 @ 0.5 dB 84 F84Z-8A 526-9459-000 2.4 @ 0.5 dB 88 F88Z-8A 526-9460-000 2.4 @ 0.5 dB 92 F92Z-8A 526-9461-000 2.4 @ 0.5 dB 96 F96Z-8A 526-9462-000 2.4 @ 0.5 dB 100 F100Z-8A 526-9463-000 2.4 @ 0.5 dB 104 F104Z-8A 526-9464-000 2.4 @ 0.5 dB 108 F108Z-8A 526-9465-000 2.4 @ 0.5 dB 64 F64Z-12 526-9632-010 3.1 @ 0.5 dB 68 F68Z-12 526-9632-020 3.1 @ 0.5 dB 72 F72Z-12 526-9632-030 3.1 @ 0.5 dB 76 F76Z-12 526-9632-040 3.1 @ 0.5 dB 80 F80Z-12 526-9632-050 3.1 @ 0.5 dB 84 F84Z-12 526-9632-060 3.1 @ 0.5 dB 88 F88Z-12 526-9632-070 3.1 @ 0.5 dB 92 F92Z-12 526-9632-080 3.1 @ 0.5 dB 96 F96Z-12 526-9632-090 3.1 @ 0.5 dB 100 F100Z-12 526-9632-100 3.1 @ 0.5 dB 104 F104Z-12 526-9632-104 3.1 @ 0.5 dB (typo? 110?) 108 F108Z-12 526-9632-108 3.1 @ 0.5 dB (typo? 120?) 64 F64Z-14 526-9633-010 3.1 @ 0.7 dB 68 F68Z-14 526-9633-020 3.1 @ 0.7 dB 72 F72Z-14 526-9633-030 3.1 @ 0.7 dB 76 F76Z-14 526-9633-040 3.1 @ 0.7 dB 80 F80Z-14 526-9633-050 3.1 @ 0.7 dB 84 F84Z-14 526-9633-060 3.1 @ 0.7 dB 88 F88Z-14 526-9633-070 3.1 @ 0.7 dB 92 F92Z-14 526-9633-080 3.1 @ 0.7 dB 96 F96Z-14 526-9633-090 3.1 @ 0.7 dB 100 F100Z-14 526-9633-100 3.1 @ 0.7 dB 104 F104Z-14 526-9633-110 3.1 @ 0.7 dB 108 F108Z-14 526-9633-120 3.1 @ 0.7 3B

MECHANICAL FILTER FOR AMATEUR USE: The following is quoted from a July 1963 Collins bulletin on the F455FB-21 filter.
Your F455FB-21 Mechanical Filter offers the same stability and steep-skirted selectivity characteristic of all Collins mechanical filters. It is a precision built component and should be treated with care. Do not apply excessive current through the transducer coils or subject the filter to excessive shock. Treat it as you would a vacuum tube or any piece of precision equipment.
Each filter has 20 db points measured and marked to insure proper crystal frequencies for SSB applications.

Specifications: F455FB-21 Mechanical Filter
Center Frequency................................. 455 kc. nom.
Frequency Response
Bandwidth, 6 db attenuation.................. 2.1 kc nom.
Bandwidth, 60 db attenuation................. 5.3 kc max.
Passband Response Variation...................... 3 db max.
Resonating Capacity.............................. 130 pf +/- 5 pf
DC Voltage: 300 VDC max. potential between terminals and ground.
Source and Load Impedance
Parallel Resonance........................... 50 K ohms min.
Series Resonance............................. 1,500 ohms max.

Recommended Operating Parameters:
Signal Input Voltage: 0 to 2 volts RMS. Direct Current: 2 ma max. Shunt feed is recommended to eliminate DC current and potential from transducer coils. Direct current should be shunted around the transducer coils through a 10 mh choke or a suitable resistor. In no case should more than 2 ma of DC be permitted to flow through the filter coils.

In order to obtain full advantage from the mechanical filter, use a common ground connection and effective shielding between the input and output. Keep the leads from the filter terminals as short and direct as possible. If these precautions are not observed, the signals normally rejected by the filter may bypass the filter through inductive or capacitive coupling.

Vacuum Tube Applications. When the filter is used in vacuum tube circuits, it should be tuned to parallel resonance within the range of 125 to 135 pf. This value will include tube, stray and wiring capacity. It may consist of a fixed capacitor of 82 to 100 pf, shunted by a variable capacitor with a range of 5-48 or any similar arrangement that will permit peaking the filter for maximum output at its center frequency. This will compensate for the inherent capacity existing in the circuit. Both input and output must be resonated. The F455FB-21 is internally terminated; therefore, a high resistance termination (100K ohms or more) is preferred. Mechanical filters are normally used interstage; when the filter is used in I.F. circuits, it essentially replaces an I.F. transformer.

Transistor Application. For low impedance applications the mechanical filter should be tuned to series resonance; for high impedance requirements parallel resonance should be employed.

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