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Old 11th Dec 2018, 12:39 pm   #1
Aub
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Default BBC Radio 4 198 kHz long wave sibilance.

It's pretty bad at the moment.

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Old 11th Dec 2018, 12:42 pm   #2
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Default Re: Radio 4 198 sibilance

Yep, it's been like that in Milton Keynes too.
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Old 11th Dec 2018, 1:04 pm   #3
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Default Re: Radio 4 198 sibilance

It's really bad here at the moment. Shame as it has been quite good for a long time, hope it's sorted soon.

John Joe.

P.s. It's just improved!
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Old 11th Dec 2018, 3:28 pm   #4
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Default Re: Radio 4 198 sibilance

Quote:
Originally Posted by linescan87 View Post
It's really bad here at the moment. Shame as it has been quite good for a long time, hope it's sorted soon.

John Joe.

P.s. It's just improved!

They read this forum
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Old 11th Dec 2018, 3:35 pm   #5
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Default Re: BBC Radio 4 198 kHz long wave sibilance.

Yes, much better. Thanks to whoever fixed it.
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Old 12th Dec 2018, 11:23 am   #6
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Default Re: BBC Radio 4 198 kHz long wave sibilance.

I had a listen BBC R4 on 198 earlier this morning and can confirm its sounding very good.
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Old 12th Dec 2018, 11:39 am   #7
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Default Re: BBC Radio 4 198 kHz long wave sibilance.

Yes it's been very good for a long time, yesterday was obviously just a little glitch. I as a regular listener of the long wave service, be it Radio 4 or the World Service through the night I really appreciate the effort put into keeping the transmission quality to a high standard.

If indeed the people involved do look in here, my sincere thanks to you.

Regards,
John Joe.
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Old 12th Dec 2018, 12:17 pm   #8
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Default Re: BBC Radio 4 198 kHz long wave sibilance.

I wonder if there's a post-it note stuck to a rack in Droitwich somewhere, saying "In case of sibilance, switch this off and on again"
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Old 12th Dec 2018, 12:39 pm   #9
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Default Re: BBC Radio 4 198 kHz long wave sibilance.

Or, 'kick the Optimod here X'.
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Old 12th Dec 2018, 3:00 pm   #10
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Default Re: BBC Radio 4 198 kHz long wave sibilance.

Quote:
Originally Posted by G8HQP Dave View Post
'kick the Optimod here X'.
The Marconi BD272 transmitters at Skelton were supplied with 11kV d.c. via solid-state rectifiers but used to be supplied via AR64 excitron rectifiers. When they were converted to s/s, the cooling fan was left operational and it came in on a contactor. Failure to close would result in a 'non-urgent alarm'.

It got to the point where the contactors used to stick occasionally, and a kick behind the control cabinet would get it going. On Sender 57 someone kicked it with a muddy boot and there was a handy footprint on 'X' for ages!
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Old 12th Dec 2018, 3:13 pm   #11
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Default Re: BBC Radio 4 198 kHz long wave sibilance.

When I was a child, one of the responsibilities of the head of the house was knowing where and how hard to thump a radio or TV in order to restore normal operation. Nice to know that the same technique was being used at the other end!
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Old 12th Dec 2018, 3:22 pm   #12
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Default Re: BBC Radio 4 198 kHz long wave sibilance.

That's the 5 guinea repair bill. 5 bob for the thump and 5 for knowing where and how hard.
"They" would be Martin, if indeed the prompt came from here.
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Old 13th Dec 2018, 12:05 am   #13
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Default Re: BBC Radio 4 198 kHz long wave sibilance.

I once worked at a place that had the workshop lights on a contactor.
Sometimes it used to start buzzing loudly. Whoever was near to a switch used to flick it on and off a couple of times to get rid of the noise.
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Old 1st Feb 2019, 3:55 pm   #14
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Default R4 LW Silibance?

Has the R4 silibance problem returned? Sounds a bit 'shshy' today at lunchtime on a couple of sets which were fine yesterday
Could it be the snow or is it just me

Regards
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Old 1st Feb 2019, 4:08 pm   #15
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Default Re: BBC Radio 4 198 kHz long wave sibilance.

No, it's not just you.

Sibilance on my Tecsun PL380, whether set to 6kHz or 4kHz bandwidth.
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Old 1st Feb 2019, 4:15 pm   #16
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Default Re: BBC Radio 4 198 kHz long wave sibilance.

That's good to know-at least the ears are still working

Wonder how long it will take to get it fixed?
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Old 1st Feb 2019, 4:52 pm   #17
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Default Re: BBC Radio 4 198 kHz long wave sibilance.

Arqiva seem to know how to fix the problem, but the Droitwich site has been lights out for many years now so somebody has to drive there and reseat the board or whatever else the fix is. I'd be surprised if it was fixed before Monday now, given that it's Friday afternoon and the weather is poor.
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Old 1st Feb 2019, 4:53 pm   #18
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Default R4 LW Sibilance Again

Hi folks, here in Bristol this afternoon I've noticed a recurrence of nasty sibilance nigh on distortion on R4 Long Wave. Unless all my valve radios are faulty, seems like an issue at the transmission end. I've encountered this phenomenon before, but not for quite a long time. Anybody else?

Cheers

Jerry
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Old 1st Feb 2019, 6:03 pm   #19
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Default Re: BBC Radio 4 198 kHz long wave sibilance.

Sounds as if it has been fixed
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Old 1st Feb 2019, 6:44 pm   #20
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Default Re: BBC Radio 4 198 kHz long wave sibilance.

Shows how much I know

Maybe somebody just happened to be on site.
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