USNy San Juan :

 

from the collection of Hajo Russow (1968)

 

see here a nice letter with a sticker (Maarten van Delft, 1966)
fine QSL-card from the files of Lars Lundström (1970)
this letter from the collection of Maarten van Delft confirms an AFRTS-feeder from both Puerto Rico and Florida (1998)
somehow similar, but fully electronic QSL (Lars Lundström, 2000)

 

TX-Site Aguada

 

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Callsigns:
NAU

 

Frequencies Voice:
2122
3221
3265
3326
4005
4015
4045
4444
4487
4525
4530
4850
4975
5072
5080
5176
5260
5335
5345
5853
5895
6835
7305
7385
7469
7500
7507
7595
7645
7880
7932
7965
7990
8010
8030
8149
8162
9050
9380
9405
9885
9992
10806
10905
11070
11140
11430
11482
11570
11643
11998
12015
12098
12106
12225
12242
12315
14562
14868
15738
15945
16055
16080
16090
16160
16170
16175
16265
16300
16355
16385
16420
17460
17540
17690
18100
18535
18990
19270
19653
20025
20375
20450
20480
20485
20525
20810
22908
22938
23160
23245
23290
23430
23700
24030
24090
24450
24930
25440
25500
25534
26575
26608
26750

 

Frequencies Radioteletype:
3393.8
4010
6969
6970
7365
7785
8998
10710
12097.5
12120
13572
14548
16020
16061
17530
20650
21855

 

Systems used:
50 Bd
75 Bd