this station is one of the most-heard utility stations ever,
here a recording from Andy Stumpf (1987)
they used to QSL with this very nice card (rb, 1973)
------------------------------------------------------------
Callsigns:
4XZ
Frequencies Morse Telegraphy:
2680
2800
2922
4237
4241
4289
4331
4442
4547
5001
5159
5186
6223
6379
6449
7654
7857
7878
7954
8012
8050
8103
8104
8437
8474
8518
8702
8705.4
8752
9041
9256
9263
10046
10270
10355
11010
11102
11170
11347.8
11548
12084
12984
13510
13546
14000
14003
14450
14518
14544
14544.2
14555
14572
14580
14648
14686
14695
15013
15050
15638
15683
15753
15803
16034
16317
16495
17050
17050.3
17050.5
17526
18000
18426
18481
18610
18975
19419
19637
19657
20000
20220
20355
20589.7
20730
20883
22676
23000