DBP Frankfurt :

 

The shortwave transmitting station in Usingen, north of Frankfurt was operated by the german administration of posts and telecommunications (Deutsche Bundespost), and besides their own telephone and telegraph services, transmissions were made for other customers, too. German press agency DPA Hamburg used their transmitters, as well as DSV Köln and MFA Bonn.

For signals in the longwave range, DBP was operating another transmitting station in Mainflingen, east of Frankfurt. From the many customers (KNA, DPA, epd, PIAB, VWD, DWD, ...) in the last century, only 2 are left until today: PTB Braunschweig with the wellknown time station DCF77, and EFR ripple control service on DCF49.

 

from 1972, 2 different types of a test tape: a voice mirror...
...and a voice mirror combined with a music mirror (both: rb, 1972)

 

this is a real QSL card from an official german station from 1964 (Lars Lundström)

 

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Callsigns:
DCF** (Mainflingen longwave)
DF#** (Usingen shortwave)

 

Frequencies Voice:
4010
4585
4883
5015
6887
9140
16430
26160

 

Frequencies FAX Picture Transmissions:
4048

 

Frequencies Radioteletype:
129.1
8130.5

 

Systems used:
50 Bd
ASCII 200 Bd
120 rpm