PTT Stockholm :

 

listen to the voice mirror, as recorded in 1967 by Hajo Russow
here the version used in the 1970's (Willi Passmann)
with the name 'Linköping Radio' they appeared in the ears of Paul Hawkins (ca 1978)

 

unfortunately, their nice QSL card never showed details (Frank Schüttig, 1976)

 

------------------------------------------------------------

 

Callsigns:
SDA *
SDC **
SDD *
SDE *
SDG **
SDI *
SDK **
SDL *
SDN **
SDQ **
SDU **
SDV ***
SDX **
SGO **
SGP **
SHG **
SHI **
SHN **
SHZ *

 

Frequencies Voice:
7435
10165
10577.5
13577.5
13942
15644
15665
15685
16052
16181
16207
18175
18645
19400
20392
20770
22930
23040
23210
26950

 

Frequencies Morse Telegraphy:
18187

 

Frequencies Radioteletype:
4572.5
4772
9067.5
9427.5
10665
10780
10797.5
12162.5
12265
16265
18160
18295
22990

 

Systems used:
50 Bd
ARQ-M2-96
SITOR