BPO / BTI London :

 

What has been the 'British Post Office', was renamed to be 'British Telecom International' - but remained the same

 

a recording from 1971, from the 'British Post Office' (rb)
for public FAX transmissions, BPO had the 'phototelegraph network' (rb, 1972)
from the files of Willi Passmann, here another species from about 1975

 

rare: a detailed reply to a report, here obtained with a PPC by Peter Conway (1971)
a non-detailed QSL card, as usual (Willi Passmann, 1975)
Rudy van Dalen received this interesting letter in 1983 from Associated Press about their transmission via BTI

 

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

 

Callsigns:
GAA **
GAB **
GAC **
GAD **
GAP **
GAR **
GAW **
GAY **
GBB **
GBE **
GBL **
GBW **
GCB **
GCW **
GDW **
GIB **
GIC **
GIE **
GIJ **
GIK **
GIN **
GIQ **
GIS **
GIW **
GIY **
GKP **
GLE **
GLF **
GLH **
GLI **
GLJ **
GLK **
GLL **
GLU **
GLW **
GLY **
GMD **
GMF **
GML **
GMO **
GNS **
GOJ **
GOP **
GOR **
GOT **
GPA **
GPB **
GPD **
GPE **
GPP **
GPU **

 

Frequencies Voice:
6963
6978
7632
7920
9138
9230
9315
9950
10380
10394
10530
10650
10885
11053
11420
11426
11480
11570
11645
13414
13568
13585
13595
13620
13910
13985
14530
14560
14653
14955
16024
16175
16440
16450
16540
18110
18200
18210
18280
18375
18438
18440
18536
18538
18610
18680
18810
19005
19024
19040
19100
19185
19455
19480
19728
19855
20235
20375
20675
21775
22740
23142.5
23495
23553
25155
25430
25470
25493

 

Frequencies Morse Telegraphy:
18551.5

 

Frequencies Radioteletype:
7397.5
10295
13624
14892
16148
16172
16315
16380
18840
19396

 

Systems used:
50 Bd
ARQ-M2-96