> Channel 5 is on channel 37 (in the London area at least...the channel list I
> have is from 90/91 prior to it - on all the transmitters listed there is
> generally at least a 3 channel difference between the stations [eg Crystal
> Palace: 23/26/30/33 for ITV/BBC1/CH4/BBC2] which I presume is to prevent
> interference).
> 
> Thus I suspect that CH5 interferance could well be the problem; as I have with
> one of my video players.  I also believe the modulator has a tendency to
> wander frequency (or was that the ZX81/2).  Tho' I did have a washy-like
> output that improved after I had re-seated (pushed back in) the chips on the
> QL (de-static-adize yourself first! - by touching something earthed).

I've just used my video to display frequencies, and used
http://www.bnoack.com/index.html (a veritable mine of info) to get Bandwith,
etc, and came up with:

    Chan   CH   Freq     Bandwidth  Video     Sound

    ITV    23   487.2    486-494    487.25    487.25
    BBC1   26   511.2    510-518    511.25    511.25
    CH4    30   543.2    542-550    543.25    543.25
    BBC2   33   567.2    566-574    567.25    567.25
    QL     36   590.4    590-598    591.25    591.25
    CH5    37   599.3    598-606    599.25    599.25

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