On 05/11/2021 12:36, Andy Burns wrote:
> NY wrote:
>
>> The spec looks as if it hasn't been sanity-checked for accuracy:
>>
>> "Frequency Ranges: FM 88-108MHz VHF: 40-109MHz UHF: 40-109MHz"
>>
>> The "VHF" setting looks like a superset of the range for "FM", and the
>> "UHF" setting is the same as "VHF", instead of being something like
>> "400-850 MHz".
>
> CPC copy/paste problem?
>
> The manufacturer's PDF says
>
> Frequency range
> MHz FM: 88 - 108
> MHz VHF:174 - 240
> MHz UHF: 470 - 862

and when put into UK mode, the VHF then becomes 206 MHz to 230 MHz ish

> not really strange as the UK only currently use chs 10B up to 12D,
> whereas the EU use the full Band III from ch 7 up to ch 13.

No, we are using the range 7A up to 12D now, the small scale DAB muxes
are using 7/8/9

http://www.wohnort.org/DAB/ukloc.html
>
> The UHF TV channel translation is still available in either mode.

I'm not sure how some receivers would cope with that, because the UHF
info in the SI won't match ?

On 05/11/2021 12:47, Mark Carver wrote:
> No, we are using the range 7A up to 12D now, the small scale DAB muxes
> are using 7/8/9
>
> http://www.wohnort.org/DAB/ukloc.html
> I'm not sure how some receivers would cope with that, because the UHF
> info in the SI won't match ?
>

Just looking at Small-Scale "Licences - Future Rounds", there is
Kintyre, Skye, Western Isles, Oban but nothing here except Moray Firth
South. Nevis Radio have (I think) always managed to remain independent
of Moray Firth but I wonder if Moray Firth are planning to cover the
area if they can ever afford it.

On 05/11/2021 12:47, Mark Carver wrote:
>
>> not really strange as the UK only currently use chs 10B up to 12D,
>> whereas the EU use the full Band III from ch 7 up to ch 13.
>
> No, we are using the range 7A up to 12D now, the small scale DAB muxes
> are using 7/8/9
>
> http://www.wohnort.org/DAB/ukloc.html
>>
>> The UHF TV channel translation is still available in either mode.
>
> I'm not sure how some receivers would cope with that, because the UHF
> info in the SI won't match ?
>

Not been a problem here where I've translated Mux 7 (and mux 8 before
closure) from two different transmitters down to Ch 38, 39, 42 and 45 in
order to clear Chs 50 to ch 68 for my 10 CCTV modulators.

See the channel plan here: https://ibb.co/7z79dLZ

SDH = Sandy Heath
WAL = Walthan
SC = Sutton Coldfield
OXF = Oxford.

The SDN, Arq A, Arq B are co channel frm WAL and OXF, The OXF ones have
higher signal strength and signal quality so the WAL ones are blocked so
I can use the OXF ones without CCI.

The signals all then go into the multiswiches.

"Mark Carver" <mark.carver@invalid.invalid> wrote in message
news:iuknfjFfjhtU1@mid.individual.net...
>
>> The UHF TV channel translation is still available in either mode.
>
> I'm not sure how some receivers would cope with that, because the UHF info
> in the SI won't match ?

How much is the list of alternative mux frequencies used nowadays? Looking
at Belmont's output, I've seen tables which refer to mux frequencies that
have long ago been allocated to 5G and bear no resemblance to ones used (now
*or in the past*) by that transmitter or any other one. Was it originally
intended that this table would be used in a similar way to the list on RDS
of alternative frequencies (on other transmitters) for a given FM station?

I presume there is a field in each mux which defines which transmitter it
is, so in an overlap area a TV might find lots of muxes from more that one
transmitter, and can choose to use only those which are all from the same
transmitter, so you don't end up with PSB1 from Belmont, PSB2 from Emley
Moor etc if it naively chooses the strongest version of each mux.

TSReaderLite is a great tool for inspecting the data in the various support
tables in a mux.

On 05/11/2021 13:30, NY wrote:
>
>
> I presume there is a field in each mux which defines which transmitter
> it is, so in an overlap area a TV might find lots of muxes from more
> that one transmitter, and can choose to use only those which are all
> from the same transmitter, so you don't end up with PSB1 from Belmont,
> PSB2 from Emley Moor etc if it naively chooses the strongest version
> of each mux.
Yes, there's also a list of frequencies that that station's relays use
(because they don't, and can't modify the SI data on re-broadcast)
They can do clever tricks using that with MHEG pop ups, that can appear
on only (or not appear ) on specified relays

In article <5986929450bob@sick-of-spam.invalid>, Bob Latham
<bob@sick-of-spam.invalid> wrote:
> > > https://cpc.farnell.com/triax/360235/tmb2000-terrestrial-channel-processor/dp/AP03399?CMP=TREML007-005

> > > Remarkable filter. You basically set which muxes you wish to receive
> > > and what UHF channel you wish them to appear on so you can move
> > > things around to suite you.

> > Thanks. Does look interesting. But do I need a 'doze box to set the
> > filtering, etc, I might need? if so, not much use for me, alas.

> No Doze box required, all set up using the font panel buttons alone.

> I don't recall seeing any way to connect a PC. There is an SD card port
> but I've not touched that.

> The only thing is, it comes preset for Europe not UK and you need to
> reset the box so that you can set it to UK. The instructions don't tell
> you how to do this, or they didn't. It's easy though, power off, hold
> down select button, power on - done. Then configure to UK.

Thanks. Useful info. :-)

Jim

--
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On 05/11/2021 13:00, SH wrote:
> On 05/11/2021 12:47, Mark Carver wrote:
>>
>>> not really strange as the UK only currently use chs 10B up to 12D,
>>> whereas the EU use the full Band III from ch 7 up to ch 13.
>>
>> No, we are using the range 7A up to 12D now, the small scale DAB muxes
>> are using 7/8/9
>>
>> http://www.wohnort.org/DAB/ukloc.html
>>>
>>> The UHF TV channel translation is still available in either mode.
>>
>> I'm not sure how some receivers would cope with that, because the UHF
>> info in the SI won't match ?
>>
>
> Not been a problem here where I've translated Mux 7 (and mux 8 before
> closure) from two different transmitters down to Ch 38, 39, 42 and 45 in
> order to clear Chs 50 to ch 68 for my 10 CCTV modulators.
>
> See the channel plan here: https://ibb.co/7z79dLZ
>
> SDH = Sandy Heath
> WAL = Walthan
> SC =  Sutton Coldfield
> OXF = Oxford.
>
> The SDN,  Arq A, Arq B are co channel frm WAL and OXF, The OXF ones have
> higher signal strength and signal quality so the WAL ones are blocked so
> I can use the OXF ones without CCI.
>
> The signals all then go into the multiswiches.

Errata. In my haste, there are some typos in the screenshot,

not replaced with the corrected version:

https://ibb.co/wpZdYNb