[cma-l] Radio Link Transmission systems

Nathan Silveston nathan at nkpa.co.uk
Fri Jun 3 11:39:10 BST 2016 

In practice I find that most CR jocks find it off putting listening to the off air audio. This makes it all the more important to have a gain structure set for all the audio you use. Otherwise you will have them riding the fader too much.

In commercial radio profanity delay is making a comeback. The new capital studios  in London have delay installed as does  xs in Manchester


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On 3 Jun 2016, at 11:29, Associated Broadcast Consultants <info at a-bc.co.uk<mailto:info at a-bc.co.uk>> wrote:

Yes Alex it is a very common requirement/demand of "experienced" presenters - they are used to hearing their voice in the headphones processed.  Especially when talking over a music bed it helps them judge the levels better - an unprocessed monitor would be likely to make them drop the fader too much.  Even a fractional delay creates a weird "empty head" kind of feeling for the presenter because of the phase difference between their actual voice and the monitored voice in their headphones.   Trying to do it with longer delays like those introduced by Barix encoders/decoders (probably around 300ms) is virtually impossible without stumbling!

Many stations avoid the issue by using an old analogue (zero delay) processor in the studio for monitoring purposes and keeping the presenters happy.

I've never come across an amateur/CR presenter require off-air or processed monitoring though.

I agree with Ian it's also it's good practice to have someone monitoring off-air.  If not the presenter, then hopefully someone in reception or back-office.

Glyn



On 2 June 2016 at 23:15, Two Lochs Radio <tlr at gairloch.co.uk<mailto:tlr at gairloch.co.uk>> wrote:

Does anybody routinely listen off-air in the studio? I have never come across any station that does that. It's good to monitor it of course, typically a radio in the kitchen or reception permanently playing, and it should be an option for the studio to check output, but am I alone in thinking it unusual to listen off-air as a matter of routine in the studio?

Alex

On 02 June 2016 at 22:25 Nathan Silveston <nathan at nkpa.co.uk<mailto:nathan at nkpa.co.uk>> wrote:

The only real drawback with ip linking is the latency if you wish to listen off air in the studio. Even the most efficient of codecs the delay is too much.

This means you either have to listen to desk output(not great) or have to have a low delay processor in the studio.

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On 2 Jun 2016, at 21:37, Two Lochs Radio <tlr at gairloch.co.uk<mailto:tlr at gairloch.co.uk>> wrote:


That's a desirable approach certainly if funds permit, Ian, but I don't think latency is usually a big deal for a one-way link is it?

Obviously for two-way links, interviews etc latency can be a big problem, but for an STL what does it matter if the transmission is slightly delayed? After all, DAB services can have seconds of latency, even with all the fancy gear the BBC can throw in, plus some in the receiver, as does any satellite-based service. And of course big talk stations deliberately go through a 5-10s delay so they can dump any 'inappropriate language'!

Alex

On 02 June 2016 at 20:04 Ian Hickling <transplanfm at hotmail.com<mailto:transplanfm at hotmail.com>> wrote:

That's fine - except it's using public networks are domestic-quality equipment with the many risk elements that entails.
Hardly a professional broadcast solution.
We would only install professional rack-mounted codecs using the latest minimum-latency software operating via fixed IP addresses linked to a known reliable ISP - if the wholly-owned option of if a radio link path using any of the 5 available platforms was physically impossible.



Ian Hickling

Partner

[http://www.transplanuk.com/wp-content/uploads/2014/07/transplan_UK_weblogo_190x60.png]<http://www.transplanuk.com/>

Office: 016 3557 8435  (07h to 22h GTS)

Car: 075 3098 0115 (only responds when driving)

6 Horn Street, Compton, NEWBURY, RG20 6QS


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From: cma-l-bounces at mailman.commedia.org.uk<mailto:cma-l-bounces at mailman.commedia.org.uk> [mailto:cma-l-bounces at mailman.commedia.org.uk] On Behalf Of Alan Coote
Sent: 02 June 2016 09:45
To: cma-l at mailman.commedia.org.uk<mailto:cma-l at mailman.commedia.org.uk>
Subject: Re: [cma-l] Radio Link Transmission systems



Using IP, you can easily stick in a router at the TX with automatic network fail-over. It will pick up your internet stream via a secondary ADSL and /or plug a 4G modem .





Alan



Subject: Re: [cma-l] Radio Link Transmission systems



not only that but sometimes the studio location can be in a really non suitable position for a transmitter site, and so you have to be situated somewhere else.



[NKPA Broadcast Ltd]
Nathan Silveston
Director
NKPA Broadcast Ltd (9817955)
M: 07900 494 398



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From: cma-l-bounces at mailman.commedia.org.uk<mailto:cma-l-bounces at mailman.commedia.org.uk> [cma-l-bounces at mailman.commedia.org.uk<mailto:cma-l-bounces at mailman.commedia.org.uk>] on behalf of Neil Munday [neilm at susyradio.com<mailto:neilm at susyradio.com>]
Sent: 01 June 2016 15:51
To: The Community Media Association Discussion List
Subject: Re: [cma-l] Radio Link Transmission systems

Nick



Stop hyping on about 5 km it's a radio wave! Besides some stations have special constructions which affect pattern from a perfect circle!



Neil

On Wednesday, 1 June 2016, Canalside's The Thread <office at thethread.org.uk<mailto:office at thethread.org.uk>> wrote:

What’s fascinating on this one is that the distance I believe between the Transmitter site and the actual base signal is about two and half miles ….. crikey !   that’s nearly as big as the actual broadcast area !



May I remind everyone ….. 5km !     don’t exceed that or else Ofcom will reach for the panic button the Commercials will chuck all their Toys out of the Pram and you’ll be in danger of broadcasting to more than one man and his Dog and we can’t have that now can we ?? as it just wouldn’t be Cricket. Everyone else pleases themselves but we have to stick to the rules of the fair play award.



Remember, our aka name is   <>   Restricted FM                    LOL       :)



A couple of yogurt cartons and a piece of string normally does the trick and keeps the signal strength to a whimper, and the cost is negligible as well       a fiver (£5) tops

With reference to what Glynn has suggested, if the signal does stray by a few yards then you can always lob a few twigs in the way of it, that also usually does the trick.

Listening to the state of ours in certain parts of Macc, I think someone has chucked a Tree in front of it.



Nick H Dumpty



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From:cma-l-bounces at mailman.commedia.org.uk<https://UrlBlockedError.aspx> [mailto:cma-l-bounces at mailman.commedia.org.uk<https://UrlBlockedError.aspx>] On Behalf Of Associated Broadcast Consultants
Sent: 01 June 2016 13:33
To: The Community Media Association Discussion List
Cc: cma-l
Subject: Re: [cma-l] Radio Link Transmission systems



I agree with Bill - if you have perfect line of sight (not even a twig in the way) then a digital 5.8GHz link is the way to go.   It gives you ample bandwidth to deliver perfect uncompressed PCM (ie CD quality) audio - no need for mp3, aac etc compression.



Rather than the free spectrum though, I'd go for licenced spectrum - for £50 a year fee it should be cleaner spectrum less susceptible to interference.



A few more details available on our website 'ere<http://a-bc.co.uk/studio-transmitter-links-stl/>.



--

Glyn Roylance - Principal Consultant

Associated Broadcast Consultants<http://www.a-bc.co.uk/>





















On 1 June 2016 at 12:06, Jonathan Pinfield <jonathan.pinfield at bcbradio.co.uk<https://UrlBlockedError.aspx>> wrote:

Hi all



We’re looking for cheap and reliable solutions to get our “on-air” output from our studios in Bradford city centre to our transmitter site a couple of miles away. We’ve got line of site from the top of our building to the transmitter site.



Please let us know cost effective & practical solutions that work for you.



Thanks



Jonathan Pinfield

Broadcast Manager – BCB 106.6fm

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