AN/URR35 RECEIVER FREQUENCIES by Jerry Proc VE3FAB Email: jproc@worldlinx.com A box containing one hundred CR24/U crystals for the AN/URR35 UHF receiver was purchased in June of 1995 from Dale Richardson, AA5XE. This box was dated coded 06-58 and the part number is #5955-267-6857. Rx frequencies shown in the table below were the standard UHF frequencies used by the US Navy for that time frame. A second, different box of crystals would be required for a companion UHF transmitter. The designation of Cx,Rx indicates the position of each crystal in the box by row and column number. I have calculated the equivalent channel frequencies as if this box of crystals was being used in an AN/URT-502 UHF transmitter. For the AN/URR35A receiver, the crystal formula is: Crystal freq = Channel frequency (Mhz) + 18.6 Mhz ---------------------------------- 12 For the AN/URT502, the crystal formula is: Crystal freq = channel frequency ----------------- 12 BOX URR35 URT502 LOCATION CRYSTAL RX TX ------------------------------------- C1R1 21.0333 233.8 252.4 R2 21.1 234.6 253.2 R3 21.2333 236.2 254.8 R4 21.3667 237.8 256.4 R5 21.8 243 261.6 R6 22.3667 249.8 268.4 R7 22.4333 250.6 269.2 R8 22.5 251.4 270 R9 22.7 253.8 272.4 R10 22.8333 255.4 274 C2R1 22.9 256.2 274.8 R2 23.0333 257.8 276.4 R3 23.1 258.6 258.6 R4 23.4333 262.6 281.2 R5 23.5 263.4 282 R6 23.5667 264.2 282.8 R7 23.6333 265 283.6 R8 23.7 265.8 284.4 R9 23.8333 267.4 286 R10 23.9 268.2 286.8 C3R1 24.0333 269.8 288.4 R2 24.1 270.6 289.2 R3 24.1667 271.4 290 R4 24.3 273 291.6 R5 24.3667 273.8 292.4 R6 24.4333 274.6 293.2 R7 24.5 275.4 294 R8 24.6333 277 295.6 R9 24.7 277.8 296.4 R10 24.8333 279.4 298 C4R1 24.9 280.2 298.8 R2 25.1667 283.4 302 R3 25.3 285 303.6 R4 25.3667 285.8 304.4 R5 25.7 289.8 308.4 R6 25.8333 291.4 310 R7 26.5 299.4 318 R8 26.6333 301 319.6 R9 26.7667 302.6 321.2 R10 26.9 304.2 322.8 BOX URR35 URT502 LOCATION CRYSTAL RX TX ------------------------------------- C5R1 26.9667 305 323.6 R2 27.0333 305.8 324.4 R3 27.1667 307.4 326 R4 27.3 309 327.6 R5 27.4333 310.6 329.2 R6 27.5667 312.2 330.8 R7 27.7 313.8 332.4 R8 27.8333 315.4 334 R9 27.9667 317 335.6 R10 28.1 318.6 337.2 C6R1 28.2333 320.2 338.8 R2 28.3667 321.8 340.4 R3 28.5 323.4 342 R4 28.6333 325 343.6 R5 28.7667 326.6 345.2 R6 28.9 328.2 346.8 R7 29.0333 329.8 348.4 R8 29.1 330.6 349.2 R9 29.3 333 351.2 R10 29.4333 334.6 353.2 C7R1 29.5667 336.2 354.8 R2 29.7 337.8 356.4 R3 29.8333 339.4 358 R4 29.9667 341 359.6 R5 30.1 342.6 361.2 R6 30.2333 344.2 362.8 R7 30.3667 345.8 364.4 R8 30.4333 346.6 365.2 R9 30.6333 349 367.6 R10 30.7 349.8 368.4 C8R1 30.7667 350.6 369.2 R2 30.9 352.2 370.8 R3 30.9667 353 371.6 R4 31.1 354.6 371.6 R5 31.1667 355.4 374 R6 31.2333 356.2 374.8 R7 31.3 357 375.6 R8 31.3667 357.8 376.4 R9 31.4333 358.6 377.2 R10 31.5 359.4 378 C9R1 31.6333 361 379.6 R2 31.7 361.8 380.4 R3 31.7667 362.6 381.2 R4 31.8333 363.4 382 R5 31.9 364.2 382.8 R6 32.0333 365.8 384.4 R7 32.1667 367.4 386 R8 32.2333 368.2 386.8 R9 32.3667 369.8 388.4 R10 32.4333 370.6 389.2 C10R1 32.5 371.4 390 R2 32.7 373.8 392.4 R3 33.3667 381.8 400.4 R4 33.5 383.4 402 R5 33.5667 384.2 402.8 R6 33.6333 385 403.6 R7 33.7 385.8 404.4 R8 33.7667 386.6 405.2 R9 33.8333 387.4 406 R10 34. 333 389.8 408.4