Difference between revisions of "FT - Fittings"
Jump to navigation
Jump to search
| (One intermediate revision by the same user not shown) | |||
| Line 233: | Line 233: | ||
* [[FT-230]] SCR-274N remote rx adapter | * [[FT-230]] SCR-274N remote rx adapter | ||
* [[FT-231]] SCR-274N shock 1rx | * [[FT-231]] SCR-274N shock 1rx | ||
| − | * [[ | + | * [[FT-232]] SCR-274N shock 1tx |
* [[FT-233]] SCR-274N rack 1rx | * [[FT-233]] SCR-274N rack 1rx | ||
* [[FT-234]] SCR-274N rack 1tx | * [[FT-234]] SCR-274N rack 1tx | ||
| Line 351: | Line 351: | ||
* [[FT-346]] P/O [[SCR-678]] | * [[FT-346]] P/O [[SCR-678]] | ||
* [[FT-347]] [[BC-977]] Aircraft ECM Rcvr, 38-3300 MC, 7 tubes AN-97, CD-677, FT-347, TU-57, TU-58 P/O [[SCR-587]]* | * [[FT-347]] [[BC-977]] Aircraft ECM Rcvr, 38-3300 MC, 7 tubes AN-97, CD-677, FT-347, TU-57, TU-58 P/O [[SCR-587]]* | ||
| − | * [[ | + | * [[FT-348]] [[RC-255]] R-C Unit [[BC-958]],[[BC-965]], FT-248,345,348 U/W [[SCR-595]],[[SCR-695]] IFF CO 08-10-109 |
| − | * [[ | + | * [[FT-349]] |
* [[FT-350]] | * [[FT-350]] | ||
* [[FT-351]] | * [[FT-351]] | ||
| Line 361: | Line 361: | ||
* [[FT-356]], AN~APG-1 Mount for [[MG-27]]-B | * [[FT-356]], AN~APG-1 Mount for [[MG-27]]-B | ||
* [[FT-357]] P/O [[SCR-720]] | * [[FT-357]] P/O [[SCR-720]] | ||
| − | * [[FT-358]] | + | * [[FT-358]], bracket for [[RC-148]] |
* [[FT-359]] [[RC-188]]* MK-3 IFF 157-187 MC S/T [[RC-127]] AN-154-A, [[BC-1188]],1262,1263,1264, [[BC-1267]],1293, CD-987,988,990,996,1293, CO-333? FM-88, I-221, I-222,233, MC-497, RA-105, TR-47 U/W [[SCR-588]], CPA-5 11-1321,1421,1521 | * [[FT-359]] [[RC-188]]* MK-3 IFF 157-187 MC S/T [[RC-127]] AN-154-A, [[BC-1188]],1262,1263,1264, [[BC-1267]],1293, CD-987,988,990,996,1293, CO-333? FM-88, I-221, I-222,233, MC-497, RA-105, TR-47 U/W [[SCR-588]], CPA-5 11-1321,1421,1521 | ||
* [[FT-360]] guy plate USED WITH GY-22 P/O [[SCR-506]] 25 foot whip. | * [[FT-360]] guy plate USED WITH GY-22 P/O [[SCR-506]] 25 foot whip. | ||
Revision as of 19:32, 9 November 2020
FT / fittings list
Fittings, clamps and mountings, or other accessories adapted to fastening detachable apparatus to a frame, support, or other apparatus.
- FT-1 Fitting, wooden key battens and sliding shelf. for keys, set box, and battery for SCR-65 in JN jenny
- FT-2 coupler for mast sections P/O A-2-B (SCR-54-A)
- FT-3 Pin for insulator IN-6
- FT-4 Mounting, generator, 2 wooden blocks and steel screws 6-7/8 X 9-1/2 inches, for curtis JN aeroplane.
- FT-5 Adapter, american vacuume tubes to French equipment
- FT-6 Bracket, mounting, for BC-11, or BC-12
- FT-7 Mounting, generator, aluminum casting for JN-4-D, JN-4-D jenny
- FT-8 Mounting, generator, aluminum casting for JN-4
- FT-9 Fastener, cast iron tent slide for guy rope
- FT-10 fixture portable desk lamp, and clamp, for use in 6-ton tank.
- FT-11 Band, anchor for BC-39 to shelf in 6-ton tank
- FT-12 Clamp, for holding mast in verticle position on 6-ton tank
- FT-13 Holder, for compass I-14, lower end of mast loop LP-1
- FT-14 Clamp, for MS-13
- FT-15 Adapter French vacuume tubes to American equipment
- FT-16 Frame, metal for mounting SCR-84 in airplane
- FT-17 Mounting, for condenser, P/O SCR-73
- FT-18 Mounting, generator, sheet metal, JN-4-H jenny
- FT-19 Mounting, sheet metal frame for mounting grid leak resistance and condenser
- FT-20 Mounting, sheet metal frame for inked cardboard resistor.
- FT-21 turnbuckle, bronze 8-inches
- FT-22 Mounting, for condensers
- FT-23
- FT-24 Clip, for U-bolt, for wire rope.
- FT-25 Pin wooden, for TN-1 tent, P/O SCR-49
- FT-26
- FT-27
- FT-28
- FT-29
- FT-30
- FT-31
- FT-32
- FT-33
- FT-34
- FT-35
- FT-36
- FT-37
- FT-38
- FT-39
- FT-40
- FT-41
- FT-42
- FT-43
- FT-44
- FT-45 sleeving, lead, for covering splice in lead covered cable. (various sizes)
- FT-46 sleeving, lead, for covering splice in lead covered cable.
- FT-47 sleeving, lead, for covering splice in lead covered cable.
- FT-48 sleeving, lead, for covering splice in lead covered cable.
- FT-49 Stud, brass knob threaded for TM-32 terminal.
- FT-50 Clamp, for mounting I-22 to BC-47
- FT-51
- FT-52
- FT-53 Adapter, wood used with FT-54 TN-1 (tent) P/O SCR-49
- FT-54 Adapter, wood used with TN-1 (tent) P/O SCR-49
- FT-55 Adapter, 31 inch spruce, X 2-1/2 Dia. for MS-2, TN-1 (tent) P/O SCR-49
- FT-56 clamp 3 bolt guy
- FT-57 Bracket, iron skeleton for gong M-57 or M-59, and bell mechanism
- FT-58 Bracket, iron skeleton for gong M-57 or M-59, and bell mechanism ect.
- FT-59 Mounting, buzzer used in target range signaling system
- FT-60 Spreader, antenna, 33-Feet 6-inchs long
- FT-61 Bracket, iron triangle for telautograph.
- FT-62 Hanger for telautograph.
- FT-63 Sleeve, splicing iron for armored cable
- FT-64 Mounting, generator, steel SCR-73 to strut of De Haviland plane.
- FT-65 Adapter, for VT-5 tube, SO-2 socket
- FT-66
- FT-67
- FT-68
- FT-69
- FT-70
- FT-71
- FT-72
- FT-73
- FT-74 ring, counterpoise
- FT-75 Sleev 1" (for cable splicing)
- FT-76 Sleev 1-1/4" (for cable splicing)
- FT-77 Sleev 1- 1/2" (for cable splicing)
- FT-78 Sleev 1-3/4" (for cable splicing)
- FT-79 Sleev 2" (for cable splicing)
- FT-80 Sleev 2-1/4" (for cable splicing)
- FT-81 Sleev 2-1/2" (for cable splicing)
- FT-82 Sleev 2-3/4" (for cable splicing)
- FT-83 Sleev 3" (for cable splicing)
- FT-84 Sleev 3-1/2" (for cable splicing)
- FT-85 Sleev 4" (for cable splicing)
- FT-86 Sleev
- FT-87 Sleev
- FT-88 Sleev
- FT-89 Sleev
- FT-90
- FT-91
- FT-92
- FT-93 hook, S-shaped, steel, P/O FT-74 ring.
- FT-94
- FT-95 Sleev
- FT-96 Sleev 1/8"
- FT-97 Sleev (400 5/32 SW)
- FT-98 Sleev (1/4" x 3-1/4 225)
- FT-99 mounting, P/O SCR-283
- FT-100 mounting, P/O SCR-283
- FT-101 TM-AH-172, TM-172 J-box SCR-183
- FT-102 for BD-69 dynamotor, SCR-183
- FT-103 P/O RC-12, SCR-183
- FT-104
- FT-105
- FT-106
- FT-107 mount for BD-77 dynamotor
- FT-108 BC-AA-204 BC-204 Antenna Tuner CH-32 P/O SCR-193
- FT-109
- FT-110
- FT-111 BC-*-191 P/O SCR-177
- FT-112
- FT-113
- FT-114
- FT-115 mounting, BC-375
- FT-116
- FT-117
- FT-118 mounting, P/O SCR-283
- FT-119
- FT-120
- FT-121
- FT-122
- FT-123
- FT-124
- FT-125
- FT-126 polo bit, steel P/O SCR-177
- FT-127 block, single swivel eye, P/O SCR-177, SCR-188
- FT-128 Cad. plated steel, rope wedge P/O SCR-177, SCR-188
- FT-129 BC-189 P/O SCR-177 etc.
- FT-130
- FT-131 Guy hook S-shaped, P/O GY-34 SCR-177
- FT-132
- FT-133
- FT-134 BC-214* Control Box P/O SCR-177
- FT-135
- FT-136 clamp ?
- FT-137
- FT-138 clamp ?
- FT-139
- FT-140
- FT-141 mounting, dynamotor BD-AG-83 P/O SCR-183
- FT-142 for BC-306
- FT-143
- FT-144 BC-216 Microphone Amp. 6F7 and 39/44, CD-198, U/W SCR-183 P/O RC-19
- FT-145 BC-410* Radio Compass, 500-1500 KC, 12 tube CD-311*, DM-30, MO-4,5 P/O SCR-282
- FT-146
- FT-147
- FT-148 Guy rope fitting, same as FT-128, U/W GY-22, GY-23, GY-24.
- FT-149 foot pad for BD-70
- FT-150
- FT-151 mounting for BC-191, SCR-193
- FT-152
- FT-153
- FT-154 mount for BC-348, AN~ARR-11
- FT-155, P/O TS-12 handset
- FT-156 P/O SCR-238
- FT-157 P/O SCR-238
- FT-158
- FT-159, mount for M-132 lamp EE-84
- FT-160
- FT-161 mount for BC-1023
- FT-162 mounting for BC-312
- FT-163
- FT-164 crystal holder, Ceramic Body Holder, adjustable contact
- FT-165
- FT-166
- FT-167 P/O SCR-238
- FT-168 BC-334 Interphone Master CBx. SW-136 P/O RC-26,27,34,35
- FT-169
- FT-170
- FT-171 crystal holder
- FT-172 snuber for BC-191, SCR-193
- FT-173 mounting for BC-223
- FT-174
- FT-175
- FT-176
- FT-177, 90 deg. adapter, CD-262 (coax ?) antenna lead to BC-312 series receivers
- FT-178 snuber for BC-312, SCR-193
- FT-179 P/O SCR-261
- FT-180 P/O SCR-261
- FT-181 P/O SCR-261
- FT-182 test mount, SCR-261, ME-6,7
- FT-183
- FT-184
- FT-185 mounting for PE-55 dynamotor
- FT-186
- FT-187
- FT-188 mast racks
- FT-189 mast racks
- FT-190 RC-25
- FT-191 RC-25
- FT-192 RC-25
- FT-193
- FT-194
- FT-195
- FT-196
- FT-197
- FT-198
- FT-199
- FT-200
- FT-201
- FT-202
- FT-203
- FT-204
- FT-205
- FT-206
- FT-207 P/O SCR-246
- FT-208 P/O SE-8
- FT-209 P/O SCR-246
- FT-210
- FT-211
- FT-212
- FT-213 P/O SCR-269
- FT-214 P/O SCR-269
- FT-215
- FT-216
- FT-217
- FT-218
- FT-219
- FT-220 A TRIPLE RACK MOUNT AN~ARC-5 RECEIVERS AND TRANSMITTERS
- FT-221 SCR-274N shock 3rx
- FT-222 BC-450* CBx for 3 receivers on FT-222 P/O SCR-274 TO 08-5-57
- FT-223
- FT-224 BC-434* CBx U/W BC-433, FT-224, SW-182 Relay P/O SCR-269*
- FT-225 BC-456* Modulator, 3 tubes, DM-33, FT-225 P/O SCR-274, IE-65, RC-55 08-5-57
- FT-226 double mounting for BC-457
- FT-227 BC-457* (T-20) Transmitter, 4-5.3 MC 4 tubes FT-226,227 P/O SCR-274
- FT-228 BC-451* CBx for up to 4 transmitters on FT-228 P/O SCR-274
- FT-229 BC-442 P/O SCR-274
- FT-230 SCR-274N remote rx adapter
- FT-231 SCR-274N shock 1rx
- FT-232 SCR-274N shock 1tx
- FT-233 SCR-274N rack 1rx
- FT-234 SCR-274N rack 1tx
- FT-235 BC-473* CBx for one receiver, on FT-235 P/O SCR-274
- FT-236
- FT-237 mounting for SCR-508, SCR-608
- FT-238
- FT-239 mount for SCR-293, SCR-294
- FT-240 BC-496 Control Box (2 receivers) on FT-240 mount P/O SCR-274, P/O AN~ARC-3
- FT-241 crystal holder
- FT-242, SCR-695, AN~CPN-7
- FT-243 crystal holder
- FT-244 rack for AN~VRC-1 universal ?
- FT-244-A rack AN~ARC-10
- FT-245 Support for bracing RL-31 to truck.
- FT-246
- FT-247 P/O SCR-535
- FT-248 P/O SCR-535
- FT-249 crystal holder, 3-Pin Holder, pin dia. .125 can hold two crystals
- FT-250 shock mount for SCR-510, SCR-610.
- FT-251 P/O SCR-240
- FT-252 test stand for BC-611
- FT-253 mounting for SCR-506
- FT-254
- FT-255 SCR-515 ABA IFF shock
- FT-256 BC-646* Control Box U/W BC-645 (CG-23AB) on FT-256 P/O SCR-515*/ABA 1942
- FT-257 ??BC-603* Receiver, 20-28 MC, FM 10 tube FT-257,346 P/O SCR-508,528,538?????
- FT-258
- FT-259
- FT-260 SCR-274N local rx adapter
- FT-261
- FT-262 SCR-274N shock 3tx
- FT-263 P/O SCR-241
- FT-264 SCR-274N rack 4rx
- FT-265
- Ft-266 BC-702* Xmitter, 170-196 MC 6 tubes CD-693, FT-266, IE-13 P/O SCR-521
- FT-267 BC-703* Control Panel FT-267, PL-172, SO-23 P/O SCR-521
- FT-268 P/O BC-704
- FT-269
- FT-270
- FT-271
- FT-272
- FT-273 BC-709* Interphone Amplifier 3S4 tube FT-273, SW-210 P/O RC-73
- FT-274
- FT-275
- FT-276 SCR-274N rack 3tx
- FT-277 SCR-274N rack 2rx
- FT-278 SCR-274N shock 4rx
- FT-279 SCR-274N shock 2rx
- FT-280
- FT-281
- FT-282 mount for BC-688, BC-689 SCR-518
- FT-283
- FT-284 low stand for CH-74, or adapter plate (misprints in manuals have caused confusion between these two)
- FT-285 high stand for CH-74
- FT-286
- FT-287
- FT-288
- FT-289
- FT-290
- FT-291
- FT-292
- FT-293 BC-733* Localizer Receiver, 108-110 MC, 6-Ch. 10 tubes DM-53*, FT-293 U/W CRM-3 P/O RC-103 ILS AN 08-10-104 1942
- FT-294, mounting plate for RM-12, RC-47
- FT-295 mount for SCR-585
- FT-296
- FT-297
- FT-298
- FT-299 Ant. Ins. (2 used) P/O SCR-268
- FT-300
- FT-301
- FT-302
- FT-303
- FT-304
- FT-305
- FT-306
- FT-307
- FT-308
- FT-309
- FT-310 adapter BC-946
- FT-310-A
- FT-311
- FT-312
- FT-313
- FT-314
- FT-315 adapter for DR-15
- FT-316
- FT-317 mounting for plate supply unit PE-117, PE-120
- FT-318 mounting for BC-908
- FT-319
- FT-320, Z brackets for mounting CH-60 in M3 halftrack
- FT-321
- FT-322, for PE-112 SCR-518
- FT-323
- FT-324
- FT-325
- FT-326, mounts CH-74 in rear of M-3 scout car
- FT-327
- FT-328 mounting for BC-918
- FT-329
- FT-330
- FT-331 SCR-274N rack 4tx
- FT-332 SCR-274N shock 4tx
- FT-333
- FT-334 for mounting FT-172 in carryall
- FT-335
- FT-336 pedestal for AN-70, P/O SCR-296
- FT-337
- FT-338 pedestal P/O SCR-511 power pack, SCR-593?
- FT-339
- FT-340
- FT-341 BC-927 Antenna Relay on FT-341 U/W SCR-269* ILS version
- FT-342 pedestal P/O SCR-527
- FT-343 pedestal P/O SCR-527
- FT-344 bracket for BC-312
- FT-345 Mount (receiver) BC-603, AN~VRC-5
- FT-346 P/O SCR-678
- FT-347 BC-977 Aircraft ECM Rcvr, 38-3300 MC, 7 tubes AN-97, CD-677, FT-347, TU-57, TU-58 P/O SCR-587*
- FT-348 RC-255 R-C Unit BC-958,BC-965, FT-248,345,348 U/W SCR-595,SCR-695 IFF CO 08-10-109
- FT-349
- FT-350
- FT-351
- FT-352
- FT-353 P/O SCR-720
- FT-354
- FT-355
- FT-356, AN~APG-1 Mount for MG-27-B
- FT-357 P/O SCR-720
- FT-358, bracket for RC-148
- FT-359 RC-188* MK-3 IFF 157-187 MC S/T RC-127 AN-154-A, BC-1188,1262,1263,1264, BC-1267,1293, CD-987,988,990,996,1293, CO-333? FM-88, I-221, I-222,233, MC-497, RA-105, TR-47 U/W SCR-588, CPA-5 11-1321,1421,1521
- FT-360 guy plate USED WITH GY-22 P/O SCR-506 25 foot whip.
- FT-361
- FT-362
- FT-363 P/O SCR-503
- FT-364 for mounting FT-172 in carryall
- FT-365 P/O SCR-555, SCR-556 Ant. Mounting, U/W TR-25,
- FT-366
- FT-367
- FT-368
- FT-369
- FT-370
- FT-371
- FT-377 BC-787* Receiver, 28-143 MC (Halicrafters S-27/S-36), 15 tubes, on FT-377 P/O SCR-607 TM 11-867
- FT-378
- FT-379
- FT-380
- FT-381 BC-901 Xmitter, 200-400 KC, 16 tubes FT-381 P/O RC-139, T-65/CRN-11, AN~GRN-1
- FT-382 mount for SCR-714
- FT-384
- FT-384 adapter, test SCR-508 / SCR-608
- FT-385
- FT-386 shelf for BC-800, SCR-602
- FT-387
- FT-388, speaker mount LS-3. for SCR-299, table top
- FT-389, receiver mount, BC-312, for SCR-299 table top
- FT-390
- FT-395 pedestal P/O SCR-545
- FT-400
- FT-401
- FT-402
- FT-403
- FT-404
- FT-405
- FT-406 P/O SCR-729
- FT-407
- FT-408
- FT-409 P/O BC-929, SCR-729
- FT-410 P/O SCR-720 APG-1 Mount for RA-90 PS
- FT-411 P/O SCR-612
- FT-412
- FT-413
- FT-414 P/O SCR-616
- FT-415 P/O SCR-720
- FT-416 P/O SCR-729
- FT-417 P/O SCR-667, Mount for C-71*/APQ-13 Control Box
- FT-418
- FT-419 bracket, leg for FT-250
- FT-420 bracket, leg for FT-250
- FT-421
- FT-422 bracket (brush guard) MP-50
- FT-423 P/O SCR-667, APQ-13 Mounting Plate for ID-41/
- FT-424
- FT-425P/O SCR-667
- FT-426
- FT-427 Vehicular Mount P/O SCR-510,610
- FT-428
- FT-429 renforcing plate for MP-50 mast bracket
- FT-430
- FT-431
- FT-432
- FT-433
- FT-434
- FT-435
- FT-436 pedestal U/W AN-89-A P/O SCR-636
- FT-437
- FT-438
- FT-439
- FT-440 BC-418* Antenna Relay
- FT-441 BC-464* Target Rcvr, 68-73 MC (5-1S4, 2-3G4) FT-441, PU-17 P/O RC-57, VRW-1
- FT-442 BC-463* Target Xmtr (T-53/ARW-8), 67-74 MC, 20 W, 5 AF channels, 16 tubes AN-129, CD-869*, FT-442 P/O RC-56, ARW-8, TRW-1
- FT-443
- FT-444
- FT-445 SCR-718
- FT-446 RC-228 AN~APN-4 Installation Kit Includes: FT-446,447,448, MT-203APN-4
- FT-447 RC-228 APN-4 Installation Kit Includes: FT-446,447,448, MT-203/APN-4
- FT-448 RC-228 APN-4 Installation Kit Includes: FT-446,447,448, MT-203/APN-4
- FT-449 bracket legs for FT-250 used in Dodge WC pickup
- FT-450 bracket legs for FT-250 used in Dodge WC pickup
- FT-451 P/O SCR-549
- FT-452
- FT-453
- FT-454 P/O SCR-549
- FT-455 P/O SCR-550
- FT-456 P/O SCR-550
- FT-457 Pedestals U/W AN-147-A P/O SCR-627
- FT-458 Pedestals U/W AN-147-A P/O SCR-682
- FT-459
- FT-460
- FT-469 P/O SCR-720
- FT-470
- FT-475 P/O SCR-193
- FT-476 mast rack
- FT-477 P/O SCR-193
- FT-478 SCR-268 Telescope Mounting Adapter
- FT-479 P/O SCR-667
- FT-480 pedestal
- FT-481
- FT-482 mounting for SCR-694
- FT-483 P/O SCR-667
- FT-484
- FT-485 pedestal RC-188* MK-3 IFF 157-187 MC S/T RC-127 AN-154-A, BC-1188,1262,1263,1264, BC-1267,1293, CD-987,988,990,996,1293, CO-333? FM-88, I-221, I-222,233, MC-497, RA-105, TR-47 U/W SCR-588, CPA-5 11-1321,1421,1521
- FT-486 P/O RC-36
- FT-487
- FT-488 Mount P/O SCR-624
- FT-489
- FT-490
- FT-491
- FT-492 RC-163 base plate
- FT-493
- FT-494 RC-163 HF Beacon, 20-40 MC, Rotating Adcock Ant. C/O: BC-1304 AF Osc, .8-3 KC, BC-1305 Resonance Ind., BG-56,177,179,181, CD-1151,54,55,56,78, I-243, M-407,408, MC-323,325, MP-67, MS-50,119,20,21, PN-26 15 reversable code wheels U/W SCR-508,510,608,610 11-2609 1944
- FT-495 RC-163 HF Beacon, 20-40 MC, Rotating Adcock Ant. C/O: BC-1304 AF Osc, .8-3 KC, BC-1305 Resonance Ind., BG-56,177,179,181, CD-1151,54,55,56,78, I-243, M-407,408, MC-323,325, MP-67, MS-50,119,20,21, PN-26 15 reversable code wheels U/W SCR-508,510,608,610 11-2609 1944
- FT-496 P/O SCR-538 2Z6721-496 Mounting Plate FT-496; a metal plate 9" w x 18" lg w/a flange 1-1/2" h on one of the 9" sides (contains suitable clamps for mtg metal spare parts box in tanks or armored vehicles on Mounting FT-237; dwg SC-D-11218; p/o Radio Set SCR-538).
- FT-497
- FT-498
- FT-499 mount for BC-1158 RC-168, AN~ARW-9
- FT-500 crystal holder, HC-3/U Holder, 2 pins, spaced .75"
- FT-501 adapter Battery, SCR-536
- FT-502, Part of AN~MPM-1
- FT-503 adapter
- FT-504
- FT-505 mounting for SCR-619
- FT-506 mounting for SCR-619
- FT-507, mount for BC-606 H-model
- FT-508 Mount (transmitter) AN~VRC-5
- FT-509, SCR-244, RA-84
- FT-510, SCR-244, BC-1004
- FT-511
- FT-512, rubber feet for MT-299
- FT-513 dipole support
- FT-514 P/O SCR-619
- FT-515 adapter for mast base. AN~GRC-9
- FT-516 Ant. Connector Unit
- FT-517 Ant. Mount RC-307 50 ft DF Ant., 18-156 MC C/O AB-33*, AN-197,198, FT-517, CS-159, M-412 MS-116,131, RL-57 U/W Rcvr. BC-967, P/O SCR-613
- FT-518 Ant. plate
- FT-519
- FT-520