Knowledge (XXG)

Telegraph key

Source 📝

323: 64: 73: 380: 81: 430:" keys or "squeeze" keys. Also like the old semi-automatic keys, the conventional assignment of the paddle directions is that pressing a paddle with the thumb (for a right-handed telegrapher, pressing the single paddle rightward, or for a double-paddle key, pressing the left paddle rightwards to the center) creates a series of 493: 937:
However, with electronic keyers (either single- or double-paddle) this is no longer the case: Keyers produce uniformly "perfect" code at a set speed, which is altered at the request of the receiver, usually not the sender. Only inter-character and inter-word spacing remain unique to the operator, and
640:
as "iambic", although this is commonly done in marketing. A dual paddle key is required for iambic sending, which also requires an iambic keyer. But any single- or dual-paddle key can be used non-iambicly, without squeezing, and there were electronic keyers made which did not have iambic functions.
547:
An additional advantage of electronic keyers over semiautomatic keys is that code speed is easily changed with electronic keyers, just by turning a knob. With a semiautomatic key, the location of the pendulum weight and the pendulum spring tension and contact must all be repositioned and rebalanced
176:
that closed the electrical circuit when the operator was not actively sending messages. This was to complete the electrical path to the next station so that its sounder would operate, as in the operator receiving a message from the next town. Although occasionally included in later keys for reasons
441:
Single paddle keys are essentially the same as the original sideswiper keys, with the left and right electrical contacts wired separately. Double-paddle keys have one arm for each of the two contacts, each arm held away from the common center by a spring; pressing either of the paddles towards the
167:
is the common telegraph key as seen in various movies. It is a simple bar with a knob on top and an electrical contact underneath. When the bar is pressed down against spring tension, it makes a closed electric circuit. Traditionally, American telegraph keys had flat topped knobs and narrow bars
644:
Iambic keying or squeeze keying reduces the key strokes or hand movements necessary to make some characters, e.g. the letter C, which can be sent by merely squeezing the two paddles together. With a single-paddle or non-iambic keyer, the hand motion would require alternating four times for
314:’). Although the original sideswiper is now rarely seen or used, when the left and right contacts are electrically separated a sideswiper becomes a modern single-paddle key (see below); likewise, a modern single-lever key becomes an old-style sideswiper when its two contacts are wired together. 434:: The clockwork pendulum on old semi-automatic keys needed the extra kick that the stronger thumb press provided. Pressing a paddle with the knuckle (hence swinging a single paddle leftward, or the right paddle on a double-paddle key leftward to the center) creates a series of 673:
The efficiency of iambic keying has recently been discussed in terms of movements per character and timings for high speed CW, with the author concluding that the timing difficulties of correctly operating a keyer iambicly at high speed outweigh any small benefits.
187:
Transmission speeds vary from 5 words (25 characters) per minute, by novice operators, up to about 30 words (150 characters) per minute by skilled operators. In the early days of telegraphy, a number of professional telegraphers developed a
27: 907:. Electromechanical recording equipment detected the closing of the switch whenever the pigeon pecked the key. Depending on the psychological questions being investigated, keypecks might have resulted in the presentation of food or other stimuli. 212:
In addition to the basic up-and-down telegraph key, telegraphers have been experimenting with alternate key designs from the beginning of telegraphy. Many are made to move side-to-side instead of up-and-down. Some of the designs, such as
800:), so-called for the brand name of the electronic keyer that introduced it. In the Ultimatic keying mode, the keyer will switch to the opposite element if the second lever is pressed before the first is released (that is, squeezed). 925:
Since every fist is unique, other telegraphers can usually identify the individual telegrapher transmitting a particular message. This had a huge significance during the first and second World Wars, since the on-board telegrapher's
442:
center makes contact, the same as pressing a single-lever key to one side. For double-paddle keys wired to an "iambic" keyer, squeezing both paddles together makes a double-contact, which causes the keyer to send alternating
171:
Straight keys have been made in numerous variations for over 150 years and in numerous countries. They are the subject of an avid community of key collectors. The straight keys used in wire telegraphy also had a
918:
With straight keys, side-swipers, and, to an extent, bugs, each and every telegrapher has their own unique style or rhythm pattern when transmitting a message. An operator's style is known as their
489:
ahead of the actual transmission. The electronics in the keyer adjusts the timing so that the output of each letter is machine-perfect. Electronic keyers allow very high speed transmission of code.
345:
s were fully mechanical, based on a kind of simple clockwork mechanism, and required no electronic keyer. A skilled operator can achieve sending speeds in excess of 40 words per minute with a ‘
168:(frequently curved), while British telegraph keys had ball shaped knobs and thick bars. This appears to be purely a matter of culture and training, but the users of each are tremendously partisan. 989:
The longer shape of the ball-headed knobs is intended to encourage the operator to incline the hand and grasp the key more lightly, to put less strain on the arm. The design is intended to reduce
303:. The side-to-side motion reduces strain, and uses different muscles than the up-and-down motion (called "pounding brass"). Nearly all advanced keys use some form of side-to-side action. 322: 248:
or "squeeze" keys). The keyer may be either an independent device that attaches to the transmitter in place of a telegraph key, or circuitry incorporated in modern amateurs' radios.
352:
The benefit of the clockwork mechanism is that it reduces the motion required from the telegrapher's hand, which provides greater speed of sending, and it produces uniformly timed
367:
or dots) at a speed which is controlled by the pendulum’s length. When the paddle is pressed toward the left (with the knuckle) it makes a continuous contact suitable for sending
1217: 574:" functions of an electronic keyer that is designed to support them: By pressing both paddles (squeezing the levers together) the operator can create a series of alternating 1302: 1306: 1246: 594:. Typical dual-paddle keys' levers move horizontally, like the earlier single-paddle keys, as opposed to how the original "straight-keys'" arms move up-and-down. 356:(dots, or short pulses) and maintains constant rhythm; consistent timing and rhythm are crucial for decoding the signal on the other end of the telegraph line. 359:
The single paddle is held between the knuckle and the thumb of the right hand. When the paddle is pressed to the right (with the thumb), it kicks a horizontal
438:. Left-handed telegraphers sometimes elect to reverse the electrical contacts, so their left-handed keying is a mirror image of standard right-handed keying. 399:
by tapping a paddle key, swinging its lever(s) from side-to-side. When pressed to one side (usually left), the keyer electronics generate a series of
272:. This key uses a side-to-side action with contacts on both the left and right and the arm spring-loaded to return to center; the operator may make a 200:. "Glass arm" or "telegrapher's paralysis" may be reduced or eliminated by increasing the side play of the straight key by loosening the adjustable 880:
Simple telegraph-like keys were long used to control the flow of electricity in laboratory tests of electrical circuits. Often, these were simple "
841:  ▄▄▄ ▄▄▄ ▄▄▄ ▄▄▄ ▄▄▄  1372: 63: 854:
electronic keyer, whether or not it even offers iambic functions, and regardless of whether the keyer iambically operates in mode 
781:
Users accustomed to one mode may find it difficult to adapt to the other, so most modern keyers allow selection of the desired mode.
758:, dots and dashes are produced as long as both paddles are depressed. When the paddles are released, the keying continues by sending 1351: 383:
A commercially manufactured iambic paddle used in conjunction with an electronic keyer to generate Morse code. The sequence of
714:
is the original iambic mode, in which alternate dots and dashes are produced as long as both paddles are depressed. Mode 
636:
Insofar as iambic keying is a function of the electronic keyer, it is not correct, technically, to refer to a dual paddle key
724:: When the paddles are released, the keying stops with the last dot or dash that was being sent while the paddles were held. 903:, the keys were mounted vertically behind a small circular hole about the height of a pigeon's beak in the front wall of an 1337: 961: 177:
of tradition, the shorting bar is unnecessary for radio telegraphy, except as a convenience when tuning the transmitter.
1190: 904: 619:  ▄▄▄ ▄ ▄▄▄ ▄ ▄▄▄  155:
Since its original inception, the telegraph key's design has developed such that there are now multiple types of keys.
829:  ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄  568:
are called dual or dual-lever paddles. With a dual paddle both contacts may be closed simultaneously, enabling the "
287:
This first new style of key was introduced in part to increase speed of sending, but more importantly to reduce the
1265: 1162: 1145: 1128: 391:
is determined by the operator, but their timing is controlled by the separate keyer that the paddle key plugs into.
816:, but there is no ability to make both contacts simultaneously by squeezing the paddles together for iambic mode. 1001:. However it is possible to injure one's arm by improperly holding and / or striking with too much force (called 743:
is the second mode, which devolved from a logic error in an early iambic keyer. Over the years iambic mode 
426:, the same name as the older side-to-side key design they greatly resemble. Double paddle keys are also called " 990: 288: 189: 1025:" comes from the rhythm in poetry, which the sound of the beat of alternating dits and dahs resembles. E.g. 956: 1387: 180:
The straight key is simple and reliable, but the rapid pumping action needed to send a string of dots (or
631:  ▄ ▄▄▄ ▄ ▄▄▄ ▄  1325:- A pictorial review of telegraphy and telegraph keys with an emphasis on spark (wireless) telegraphy. 888: 120: 232:
have been developed, which are operated by special keys of various designs generally categorized as
1382: 1377: 124: 1174: 900: 39:, a key used by U.S. military during World War II, and frequently re-used by radio amateurs 1296: 1240: 1211: 55: 48: 971: 931: 668:  ▄▄▄ ▄ ▄▄▄ ▄  538:  ▄▄▄ ▄ ▄▄▄ ▄  522:  ▄ ▄▄▄ ▄ ▄▄▄  93: 794:
A third electronic keyer mode useful with a dual paddle is the "Ultimatic" mode (mode 
1341: 128: 127:. An operator uses the telegraph key to send electrical pulses (or in the case of modern 407:. Keyers work with two different types of keys: Single paddle and double paddle keys. 1366: 1022: 896: 583: 570: 72: 966: 147:. These pulses encode the letters and other characters that spell out the message. 85: 1232: 1334: 1259: 1184: 1156: 1139: 1122: 951: 749:
has become something of a standard and is the default setting in most keyers.
363:
which then rocks against the contact point, sending a series of short pulses (
116: 112: 26: 1359:- An online resource for identification of all types of telegraph instruments 1346: 1279: 379: 336: 294: 884:" keys, in which a bend in the key lever provided the key's spring action. 617:
in poetry, and the method could as logically be called "trochaic keying" (
131:, unmodulated radio waves) of two different lengths: short pulses, called 762:
than has already been heard. I.e., if the paddles were released during a
360: 201: 469:
functions, so the operator does not need to use perfect spacing between
1195: 1064: 614: 516:. Pressing both at the same time (a "squeeze") produces an alternating 310:
which noticeably affects the operator's transmission rhythm (known as ‘
80: 819:
When a single-paddle key is used with an electronic keyer, continuous
371:(dashes); the telegrapher remains responsible for timing of the dahs. 892: 677:
Iambic keyers function in one of at least two major modes: Mode 
410:
Like semi-automatic keys, pressing the paddle on one side produces a
108: 1328: 501: 491: 462: 396: 378: 321: 79: 71: 1356: 1322: 1158:
Straight Key hand sending technique as approved by professionals
930:
could be used to track individual ships and submarines, and for
492: 204:
screws. Such problems can be avoided by using a good technique.
89: 341:, after the company that first manufactured them. The original 184:
as most operators call them) poses some significant drawbacks.
123:
systems, including landline (also called wire) telegraphy and
403:; when pressed to the other side (usually right), a series of 16:
Electrical switch used to transmit text messages in Morse code
613:, so the string of elements will be similar to a sequence of 508:" mode requires a key with two paddles: One paddle produces 228:
Beginning in the mid-20th century electronic devices called
326:
Early "bug" telegraph key invented in 1913 by Weston Hadden
625:
lever makes first contact, then the string begins with a
605:
is determined by which lever makes contact first: If the
1331:- A resource for telegraph key collectors and historians 609:
lever is closed first, then the first element will be a
330:
A popular side-to-side key is the semi-automatic key or
306:
The alternating action produces a distinctive rhythm or
111:
used by a trained operator to transmit text messages in
280:
by swinging the lever in either direction. A series of
485:
memory, the operator's keying action can be about one
395:
Like semi-automatic keys, the telegrapher operates an
586:. For that reason, dual paddles are sometimes called 808:
A single-lever paddle key has separate contacts for
1017: 1015: 1013: 1011: 887:Telegraph-like keys were once used in the study of 54: 44: 256:The first widely accepted alternative key was the 76:a Wright Brothers telegraph key (missing its knob) 458:, depending on which lever makes first contact). 1216:: CS1 maint: bot: original URL status unknown ( 766:then the last element sent will be a following 689:. There is a third, rarely available mode  496:Electronic dual paddle keyer (homemade in 1972) 284:can be sent by rocking the arm back and forth. 1176:How to properly adjust and use a Vibroplex bug 774:then the sequence will end with the following 291:affecting telegraphers, then popularly called 8: 1301:: CS1 maint: multiple names: authors list ( 19: 1245:: CS1 maint: numeric names: authors list ( 1305:) CS1 maint: numeric names: authors list ( 1199:. Archived from the original on 2014-01-26 35:style of telegraph key – model  25: 560:Keys having two separate levers, one for 1063:It could just as well have been called " 938:can produce a less clear semblance of a 770:; if the paddles were released during a 1187:on 2021-12-11 – via Ghostarchive. 1115: 993:once common among telegraphers, called 982: 125:radio (also called wireless) telegraphy 119:system. Keys are used in all forms of 1294: 1238: 1209: 1005:) with either type of up-and-down key. 895:. Starting in the 1940s, initiated by 18: 1347:The Art and Skill of Radio Telegraphy 418:. Single paddle keys are also called 7: 1280:"Iambic keying – debunking the myth" 597:Whether the sequence begins with a 14: 375:Electronic keyers and paddle keys 1141:Technique Of Hand Sending (1944) 524:) sequence, which starts with a 62: 910: 722:"what you hear is what you get" 532:side makes contact first, or a 1: 1124:How to operate a straight key 962:QSK operation (full break-in) 582:, analogous to a sequence of 1352:Development of the Morse Key 905:operant conditioning chamber 139:, and longer pulses, called 107:is a specialized electrical 1323:Sparks Telegraph Key Review 835:are created by holding the 831:...); likewise, continuous 823:are created by holding the 225:keys operate mechanically. 1404: 1261:How to use an iambic keyer 1373:Human–machine interaction 1191:"Wayback Machine archive" 512:s and the other produces 61: 24: 1278:Emm, Marshall G., N1FN. 991:repetitive strain injury 846:A single-paddle key can 804:Single-lever paddle keys 289:repetitive strain injury 190:repetitive stress injury 1183:(video). Archived from 957:Prosigns for Morse code 334:, sometimes known as a 301:"telegraphic paralysis" 198:telegrapher's paralysis 497: 392: 327: 96: 77: 999:telegraphic paralysis 544:side connects first. 495: 382: 325: 264:, sometimes called a 92:(1900) first used by 83: 75: 1329:The Telegraph Office 889:operant conditioning 876:Non-telegraphic keys 556:Double-lever paddles 477:or vice versa. With 121:electrical telegraph 621: ...). If the 467:dot and dash memory 208:Alternative designs 21: 1340:2013-03-02 at the 1233:"Arduino CW Keyer" 901:Harvard University 850:-iambicly operate 564:and the other for 504:in what's called " 498: 393: 328: 318:Semi-automatic key 236:keys (also called 97: 78: 1335:The Keys of N1KPR 978:Explanatory notes 463:electronic keyers 420:single lever keys 84:A Morse Key from 70: 69: 56:Electronic symbol 1395: 1311: 1310: 1300: 1292: 1290: 1289: 1284: 1275: 1269: 1262: 1257: 1251: 1250: 1244: 1236: 1228: 1222: 1221: 1215: 1207: 1205: 1204: 1188: 1171: 1165: 1159: 1154: 1148: 1142: 1137: 1131: 1125: 1120: 1105: 1019: 1006: 1003:"pounding brass" 987: 972:Words per minute 932:traffic analysis 871: 870: 865: 864: 859: 858: 842: 830: 799: 798: 790: 789: 760:one more element 757: 756: 748: 747: 742: 741: 733: 732: 719: 718: 713: 712: 704: 703: 694: 693: 688: 687: 682: 681: 669: 650: 649: 632: 620: 539: 523: 414:and the other a 397:electronic keyer 94:Gotthard Railway 66: 29: 22: 1403: 1402: 1398: 1397: 1396: 1394: 1393: 1392: 1363: 1362: 1342:Wayback Machine 1319: 1314: 1293: 1287: 1285: 1282: 1277: 1276: 1272: 1260: 1258: 1254: 1237: 1230: 1229: 1225: 1208: 1202: 1200: 1189: 1173: 1172: 1168: 1157: 1155: 1151: 1140: 1138: 1134: 1123: 1121: 1117: 1113: 1108: 1020: 1009: 988: 984: 980: 948: 916: 878: 868: 867: 862: 861: 856: 855: 840: 828: 806: 796: 795: 792: 787: 786: 754: 753: 745: 744: 739: 738: 735: 730: 729: 720:is essentially 716: 715: 710: 709: 706: 701: 700: 691: 690: 685: 684: 679: 678: 667: 647: 646: 630: 618: 584:iambs in poetry 558: 537: 521: 518:dit-dah-dit-dah 377: 320: 254: 210: 161: 153: 40: 17: 12: 11: 5: 1401: 1399: 1391: 1390: 1385: 1380: 1375: 1365: 1364: 1361: 1360: 1357:Telegraph Keys 1354: 1349: 1344: 1332: 1326: 1318: 1317:External links 1315: 1313: 1312: 1270: 1252: 1223: 1166: 1149: 1132: 1114: 1112: 1109: 1107: 1106: 1104: 1103: 1062: 1061: 1007: 981: 979: 976: 975: 974: 969: 964: 959: 954: 947: 944: 915: 909: 877: 874: 827:-side paddle ( 805: 802: 791: 783: 734: 726: 705: 697: 683:and mode  557: 554: 548:to change the 376: 373: 319: 316: 299:or clinically 253: 250: 223:semi-automatic 209: 206: 160: 157: 152: 149: 86:G. Hasler 68: 67: 59: 58: 52: 51: 46: 42: 41: 30: 15: 13: 10: 9: 6: 4: 3: 2: 1400: 1389: 1388:Amateur radio 1386: 1384: 1381: 1379: 1376: 1374: 1371: 1370: 1368: 1358: 1355: 1353: 1350: 1348: 1345: 1343: 1339: 1336: 1333: 1330: 1327: 1324: 1321: 1320: 1316: 1308: 1304: 1298: 1281: 1274: 1271: 1267: 1263: 1256: 1253: 1248: 1242: 1234: 1227: 1224: 1219: 1213: 1198: 1197: 1192: 1186: 1182: 1178: 1177: 1170: 1167: 1164: 1160: 1153: 1150: 1147: 1143: 1136: 1133: 1130: 1126: 1119: 1116: 1110: 1101: 1097: 1093: 1089: 1085: 1081: 1077: 1073: 1069: 1068: 1066: 1059: 1055: 1051: 1047: 1043: 1039: 1035: 1031: 1027: 1026: 1024: 1018: 1016: 1014: 1012: 1008: 1004: 1000: 996: 992: 986: 983: 977: 973: 970: 968: 965: 963: 960: 958: 955: 953: 950: 949: 945: 943: 941: 935: 933: 929: 923: 921: 914: 908: 906: 902: 898: 897:B. F. Skinner 894: 890: 885: 883: 875: 873: 853: 849: 844: 838: 834: 826: 822: 817: 815: 811: 803: 801: 784: 782: 779: 777: 773: 769: 765: 761: 752:In mode  750: 727: 725: 723: 698: 696: 675: 671: 666: 662: 658: 654: 642: 639: 634: 628: 624: 616: 612: 608: 604: 600: 595: 593: 589: 585: 581: 577: 573: 572: 567: 563: 555: 553: 551: 545: 543: 535: 531: 527: 519: 515: 511: 507: 503: 494: 490: 488: 484: 480: 476: 472: 468: 464: 459: 457: 453: 449: 445: 439: 437: 433: 429: 425: 421: 417: 413: 408: 406: 402: 398: 390: 386: 381: 374: 372: 370: 366: 362: 357: 355: 350: 348: 344: 340: 338: 333: 324: 317: 315: 313: 309: 304: 302: 298: 296: 290: 285: 283: 279: 275: 271: 267: 263: 259: 251: 249: 247: 243: 242:double-paddle 239: 235: 234:single-paddle 231: 226: 224: 220: 216: 207: 205: 203: 199: 195: 191: 185: 183: 178: 175: 169: 166: 159:Straight keys 158: 156: 150: 148: 146: 142: 138: 134: 130: 126: 122: 118: 114: 110: 106: 102: 101:telegraph key 95: 91: 87: 82: 74: 65: 60: 57: 53: 50: 47: 43: 38: 34: 28: 23: 20:Telegraph key 1286:. Retrieved 1273: 1255: 1226: 1201:. Retrieved 1194: 1185:the original 1180: 1175: 1169: 1152: 1135: 1118: 1099: 1095: 1091: 1087: 1083: 1079: 1075: 1071: 1057: 1053: 1049: 1045: 1041: 1037: 1033: 1029: 1002: 998: 994: 985: 967:Telegraphist 939: 936: 927: 924: 919: 917: 912: 886: 881: 879: 851: 847: 845: 836: 832: 824: 820: 818: 813: 809: 807: 793: 780: 775: 771: 767: 763: 759: 751: 736: 721: 707: 676: 672: 664: 660: 656: 652: 643: 637: 635: 633: ...). 626: 622: 610: 606: 602: 598: 596: 591: 588:squeeze keys 587: 579: 575: 569: 565: 561: 559: 549: 546: 541: 533: 529: 525: 517: 513: 509: 505: 499: 486: 482: 478: 474: 470: 466: 460: 455: 451: 447: 443: 440: 435: 431: 427: 423: 419: 415: 411: 409: 404: 400: 394: 388: 384: 368: 364: 358: 353: 351: 346: 342: 335: 331: 329: 311: 307: 305: 300: 292: 286: 281: 277: 273: 269: 265: 261: 257: 255: 245: 241: 237: 233: 229: 227: 222: 219:bushwhackers 218: 214: 211: 197: 193: 186: 181: 179: 174:shorting bar 173: 170: 165:straight key 164: 162: 154: 144: 140: 136: 132: 104: 100: 98: 36: 33:straight key 32: 995:"glass arm" 911:Operators' 592:iambic keys 424:sideswipers 270:bushwhacker 252:Sideswipers 238:sideswipers 215:sideswipers 1383:Morse code 1378:Telegraphy 1367:Categories 1288:2022-11-09 1203:2021-12-12 1111:References 1021:The name " 952:Morse code 737:Mode  708:Mode  266:cootie key 262:sidewinder 258:sideswiper 117:telegraphy 113:Morse code 1044:s" ≈ dit 540:) if the 337:Vibroplex 295:glass arm 244:keys (or 194:glass arm 192:known as 105:Morse key 1338:Archived 1297:cite web 1241:cite web 1212:cite web 1065:trochaic 946:See also 839:paddle ( 615:trochees 500:Using a 465:include 361:pendulum 246:"iambic" 230:"keyers" 202:trunnion 1266:YouTube 1196:YouTube 1181:YouTube 1163:YouTube 1146:YouTube 1129:YouTube 1086:ble" ≈ 893:pigeons 552:speed. 528:if the 240:), and 1231:K3NG. 1036:s and 1032:dless 1023:iambic 940:"fist" 928:"fist" 920:"fist" 913:"fist" 843:...). 638:itself 571:iambic 506:iambic 428:iambic 221:) and 141:dashes 109:switch 49:Switch 1283:(PDF) 1098:dit, 1094:dit, 1090:dit, 1078:ble, 1074:ble, 1034:clime 891:with 882:strap 866:, or 785:Mode 728:Mode 699:Mode 601:or a 502:keyer 461:Most 308:swing 151:Types 115:in a 1307:link 1303:link 1247:link 1218:link 1102:dit. 1084:trou 1082:and 1080:toil 1056:dit 1052:dit 1048:dit 1042:skie 1040:rry 1030:clou 1028:"Of 833:dahs 821:dits 814:dahs 812:and 810:dits 580:dahs 578:and 576:dits 566:dahs 562:dits 514:dahs 475:dahs 473:and 471:dits 456:dits 454:and 452:dahs 450:(or 448:dahs 446:and 444:dits 436:dahs 432:dits 405:dits 401:dahs 389:dahs 387:and 385:dits 369:dahs 365:dits 354:dits 312:fist 282:dits 217:(or 182:dits 145:dahs 137:dits 133:dots 90:Bern 45:Type 37:J-38 1264:on 1161:on 1144:on 1127:on 1100:dah 1096:dah 1092:dah 1088:dah 1076:dou 1072:Dou 1067:": 1058:dah 1054:dah 1050:dah 1046:dah 1038:sta 997:or 899:at 852:any 848:non 837:dah 825:dit 776:dah 772:dit 768:dit 764:dah 670:). 665:dit 661:dah 657:dit 653:dah 627:dit 623:dit 611:dah 607:dah 603:dah 599:dit 590:or 550:dit 542:dah 534:dah 530:dit 526:dit 510:dit 487:dit 483:dah 481:or 479:dit 422:or 416:dah 412:dit 349:’. 347:bug 343:bug 339:key 332:bug 278:dah 276:or 274:dit 268:or 260:or 196:or 143:or 135:or 103:or 1369:: 1299:}} 1295:{{ 1243:}} 1239:{{ 1214:}} 1210:{{ 1193:. 1179:. 1010:^ 942:. 934:. 922:. 872:. 860:, 778:. 695:. 163:A 129:CW 99:A 88:, 31:A 1309:) 1291:. 1268:. 1249:) 1235:. 1220:) 1206:. 1070:" 1060:. 869:U 863:B 857:A 797:U 788:U 755:B 746:B 740:B 731:B 717:A 711:A 702:A 692:U 686:B 680:A 663:- 659:- 655:- 651:( 648:C 629:( 536:( 520:( 297:" 293:"

Index


Switch
Electronic symbol



G. Hasler
Bern
Gotthard Railway
switch
Morse code
telegraphy
electrical telegraph
radio (also called wireless) telegraphy
CW
repetitive stress injury
trunnion
repetitive strain injury
glass arm

Vibroplex
pendulum

electronic keyer
electronic keyers

keyer
iambic
iambs in poetry
trochees

Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.