[A-DX] Mongolei 209 kHz

[Roger]

Am 01.05.2015 um 18:05 schrieb Manfred Wallat:
> Noch bis in den 60er Jahren sendete man noch nach dem Raster
> 155, 164, 173....209, 218 usw.


http://www.wabweb.net/radio/radio/frequenz3.htm

http://ukspec.tripod.com/specbw.html#blw

           On old radios, French GO=Grandes Ondes (LW), PO=Petites Ondes 
(MW), OC=Ondes Courtes (SW)

           A conference in Prague in 1929 provided for the 9-khz 
channels (then called kilocycles) in the
           Europeen Broadcasting Area for LW and MW ... "a few hadn't 
moved even by *1964* (MW)"

           "LW .. built around 200 Khz being a frequency check by 
Droitwich, so went 200,209, 218,
           ..etc and 191, 182...etc the other way.  A lot later when 
*PLL* and synthesised tuning came in,
           the channels were changed to be multiples of 9, so the LW all 
moved down 2 Khz.
           Before that, the MW had moved (November 1978) UP freq by just 
1 khz for the same reason,
           thus 908 (then the BBC Radio 4) became 909 (now 5 live)"

           LW : " lower freqs (up to 177 kHz?) moved in late 1987, the 
middle section (180-225) in
           February 1988 and the top end in Feb 1990. Atlantic 252 
launched on 254 kHz in Sept 1989"

           "Before November 1978 the arrangement on Medium Wave was like 
this:
           Most channels were 9 kHz spaced, on a frequency which was a 
multiple of 9 kHz, minus 1 kHz.
           For example, London Radio 4 was 908 kHz, Radio 3 was 647 kHz, 
and Radio 1 was 1214 kHz.
           There was one 10 kHz spacing at the bottom end: 539 kHz 
(normal pattern), then 529 kHz.
           At the top end there were 8 channel spacings of 8 kHz. I 
assume this must have been done to
           get one extra channel when the top end of the band was 
extended from around 1550 kHz to 1606.5 kHz.
           The frequencies were 1538 kHz (normal pattern), then 1546, 
1554, 1562, 1570, 1578, 1586, 1594, 1602."




roger