15-11-2017, 02:32 PM
38.9MHz was chosen by the CCIR long before the UK considered using the 625-line system but this created other problems due to the need for early 625-line sets to cater for both 625 and 405 line signals.
One suggestion is that the 39.5MHz figure came from Mullard:
This is taken from Synchrodyne's post on the subject on the old VRAT forum. The original thread can be seen here.
One suggestion is that the 39.5MHz figure came from Mullard:
Quote:Mullard at least on occasion advocated dual-standard IF strips whose basic bandpass characteristic was 6 dB down at 34.65 and 39.5 MHz respectively, and so which included the Nyquist slopes for both the 405- and 625-line cases ...
This is taken from Synchrodyne's post on the subject on the old VRAT forum. The original thread can be seen here.
