Many thanks to SRAA contributor, Dan Greenall, who shares the following recording and notes:

Broadcaster: PTT voice mirrors from the 1970's Part 1

Frequency: various

Recption location: Ancaster, Ontario, Canada

Receiver and antenna: Hallicrafters S-52 using a longwire antenna

Mode: Single Side Band

Notes:

Point to point stations were commonly found on shortwave in the 1970's outside of the normal SWBC bands. They could often be heard transmitting a repeating test message so a receiving station could tune them in prior to conducting radiotelephone traffic. These recordings were all made at Ancaster, Ontario, Canada, using either a Hallicrafters S52 or Realistic DX150A receiver hooked up to a long wire antenna.

1.  Australian Overseas Radiotelephone Service, Sydney

2.  Reykjavik Radio, Iceland

3.  Moscow Radio Telephone Station, USSR

4.  Radio Telephone Station, Warsaw, Poland

5.  Overseas Station Berlin, German Democratic Republic

6.  Yugoslav Telegraph and Telephone Administration, Belgrade

7.  Swiss Telegraph and Telephone Administration, Bern

8.  ITALCABLE, Rome, Italy

9.  Netherlands PTT, Amsterdam

10.  Cyprus Telecommunications Authority, Nicosia

11.  Cairo Radio Telephone Terminal, Arab Republic of Egypt

12. PTT and Radio Administration, Tel Aviv, Israel

13. Saudi Arabian Post, Telegraph and Telephone Administration, Jeddah

14.  Moroccan Radio Electrical Centre, Rabat

15.  Companhia Portuguesa Radio Marconi, Luanda, Angola

16.  RCA Global Communications, New York City

17.  France Cables and Radio Company, Lome, Togo

18.  Zambian Post Office, Lusaka