Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss
Re: Digital HDMI modulators and LCN
211 views
Skip to first unread message
SH
Jul 25, 2021, 5:12:44 PM7/25/21
to
On 25/07/2021 20:32, Bob Latham wrote:
> What is the safest value to set the LCN for a digital modulator or 3?
>
> Some value not used by Freeview obviously but where?
>
> As with everything I do these days I consider what is the best state
> to leave things should I drop dead and leave it for my wife. An
> impossible thing to answer but the book that comes with one modulator
> suggests 800, 801 etc.. Yes, I realise this area is reserved for
> "second finds" when scanning but my aerial system is very well
> filtered so no seconds and presumably Freeview will leave the 800
> range alone.
>
> So that's where I've been setting them but things are not straight
> forward. I noticed though that the LCN I set in the modulator didn't
> seem to make any difference, it seemed as though the TV stored them
> from 800 onwards first found first stored so the lowest frequency
> modulator is at 800 and the highest frequency modulator 802
> regardless of the LCN settings in the modulator. Step outside the 800
> range and the LCN setting works as expected.
>
> Today I discovered that it's even more complex. JVC tvs faced with an
> LCN in the 800s store the channels in frequency order but Sony TVs
> use the Service ID. This means to get the same channel numbers on
> both types of TV you need the frequency and the Service IDs in the
> same order. Horrible.
>
> Does anyone have a better idea for the LCN setting?
>
> There is nothing in the 300, 400 or 900 range that I can see.
>
> Another idea I've had is to pick numbers already used by freeview on
> the assumption that if the TVs see my modulators first (lower
> frequency) then the Freeview channel will become a second find and
> get bounced to 800s. So maybe pick 3 LCN numbers never to be watched.
> Trouble is, things change.
>
> Is there a range of numbers reserved for none broadcast or home
> users? Too much to expect I suppose?
>
>
> Thanks.
>
> Bob.
>
I have 10 analogue monds here. When I switch to 10 HDMI mods, I'll be:
Setting them all in frequency order at 50 to 68
and set the LCNs to 990, 991 ..... 998 and 999 in the same order as the
mods frequencies.
Glad you are getting on well with the Triax TMB2000... Did you manage to
sort out your Magic eyes picking up stray Brierley Hill? :-)
> What is the safest value to set the LCN for a digital modulator or 3?
>
> Some value not used by Freeview obviously but where?
>
> As with everything I do these days I consider what is the best state
> to leave things should I drop dead and leave it for my wife. An
> impossible thing to answer but the book that comes with one modulator
> suggests 800, 801 etc.. Yes, I realise this area is reserved for
> "second finds" when scanning but my aerial system is very well
> filtered so no seconds and presumably Freeview will leave the 800
> range alone.
>
> So that's where I've been setting them but things are not straight
> forward. I noticed though that the LCN I set in the modulator didn't
> seem to make any difference, it seemed as though the TV stored them
> from 800 onwards first found first stored so the lowest frequency
> modulator is at 800 and the highest frequency modulator 802
> regardless of the LCN settings in the modulator. Step outside the 800
> range and the LCN setting works as expected.
>
> Today I discovered that it's even more complex. JVC tvs faced with an
> LCN in the 800s store the channels in frequency order but Sony TVs
> use the Service ID. This means to get the same channel numbers on
> both types of TV you need the frequency and the Service IDs in the
> same order. Horrible.
>
> Does anyone have a better idea for the LCN setting?
>
> There is nothing in the 300, 400 or 900 range that I can see.
>
> Another idea I've had is to pick numbers already used by freeview on
> the assumption that if the TVs see my modulators first (lower
> frequency) then the Freeview channel will become a second find and
> get bounced to 800s. So maybe pick 3 LCN numbers never to be watched.
> Trouble is, things change.
>
> Is there a range of numbers reserved for none broadcast or home
> users? Too much to expect I suppose?
>
>
> Thanks.
>
> Bob.
>
I have 10 analogue monds here. When I switch to 10 HDMI mods, I'll be:
Setting them all in frequency order at 50 to 68
and set the LCNs to 990, 991 ..... 998 and 999 in the same order as the
mods frequencies.
Glad you are getting on well with the Triax TMB2000... Did you manage to
sort out your Magic eyes picking up stray Brierley Hill? :-)
SH
Jul 26, 2021, 1:15:03 PM7/26/21
to
Conexer... is that a brand via Labgear?
I want to switch to digital mods from Analogue ones but the cost of
conversion will not go past SWMBO that easily.... :-(
I did find some Satlink ones on AliExpress that was the cheapest I'd
ever seen:
https://www.aliexpress.com/item/32996105114.html?spm=a2g0o.productlist.0.0.7da36ef639Hf4l&algo_pvid=bad9dc9f-ccca-460e-9935-810ba9ae2031&algo_exp_id=bad9dc9f-ccca-460e-9935-810ba9ae2031-0
SH
Jul 26, 2021, 1:22:46 PM7/26/21
to
Had a quick online shopping browse....
https://cpc.farnell.com/search?st=conexer
Ouch.....
The quad unit is more than double than the cost of 4 individual satlinks!
The dual unit is more than double the cost of 2 individual satlinks.....
Mind you, it can deal with composite video which teh Satlinks cannot do
which would suit my CCTV cameras...
I had thought about upgrading my CCTV cams to AH/TVI/CVI and use a
converter to HDMI to then us ethe Satlinks on.
https://www.videcon.co.uk/ahd-tvi-cvi-video-to-hdmi-converter-vhd-ahd-conv/
SH
Jul 26, 2021, 4:07:26 PM7/26/21
to
>
>> The quad unit is more than double than the cost of 4 individual
>> satlinks!
>
> wrong) that the device uses two *adjacent* UHF channels to deliver 4
> signal paths.
Adjacent channels are not an issue for DTT, I've seen DTT transmitters
use 3 DTT channels in consecutive order.
DTT does not have vestigial sidebands (VSB) or Double sidebands (DSB)
like analogue does.
>> The dual unit is more than double the cost of 2 individual
>> satlinks.....
>
> requirement for adjacent UHF channels.
Adjacent digital channels are not an issue really.
> Also power is an issue. These units draw around 10 watts each 24/7
> but if you do two in one box it's a bit more efficient.
>
>> Mind you, it can deal with composite video which teh Satlinks
>> cannot do which would suit my CCTV cameras...
>
> Are you sure? I've got one and I've seen no sign of that.
>> Mind you, it can deal with composite video which teh Satlinks
>> cannot do which would suit my CCTV cameras...
>
Well teh models I've been looking at were analogue video and stereo
audio inputs and they didn't have HDMI inputs....
It does sound you and I are looking at different models as you use HDMI
outputs from yoru set top boxes?
The ones I saw were:
https://cpc.farnell.com/antiference/dmsd01/digital-modulator-single-sd-dvb/dp/AP02862?st=conexor
https://cpc.farnell.com/antiference/dmsd02/digital-modulator-twin-sd-dvb/dp/AP02864?st=conexor
https://cpc.farnell.com/antiference/dmsd04/digital-modulator-quad-sd-dvb/dp/AP02865?st=conexor
SH
Jul 27, 2021, 6:46:43 AM7/27/21
to
On 26/07/2021 21:39, Bob Latham wrote:
> In article <sdn4lr$12dl$1...@gioia.aioe.org>,
> channels here that don't have anything detectable on them from the
> aerial. They are C22, C25, C28 and I use those for my modulators just
> in case. That's why I'm put off by two *forced* adjacent channels.
>
I use the Triax TMB2000 to channel shift from the TV aerials to free up
ch 55 & 56 and resolve co-channel transmitters ..... (before Mux 8 got
closed) from both Sandy & Oxford
So CH 55 and 56 from both Oxford and Sandy got shifted down to Ch 28, 30
and 38 and 39...... (and I have Sutton Coldfield, Oxford, Sandy Heath
and Waltham all combined here)
So if you can get a cable up with the modulator outputs onto one of the
spare aerial inputs, it s a doddle. :-)
S.
> In article <sdn4lr$12dl$1...@gioia.aioe.org>,
> SH <i.lov...@spam.com> wrote:
>
>>>
>>>> The quad unit is more than double than the cost of 4 individual
>>>> satlinks!
>>>
>>> Yes and too much of eggs in one basket plus I believe (could be
>>> wrong) that the device uses two *adjacent* UHF channels to
>>> deliver 4 signal paths.
>
>> Adjacent channels are not an issue for DTT, I've seen DTT
>> transmitters use 3 DTT channels in consecutive order.
>
> I know that but that isn't the point of interest. I have 3 UHF
>
>>>
>>>> The quad unit is more than double than the cost of 4 individual
>>>> satlinks!
>>>
>>> Yes and too much of eggs in one basket plus I believe (could be
>>> wrong) that the device uses two *adjacent* UHF channels to
>>> deliver 4 signal paths.
>
>> Adjacent channels are not an issue for DTT, I've seen DTT
>> transmitters use 3 DTT channels in consecutive order.
>
> channels here that don't have anything detectable on them from the
> aerial. They are C22, C25, C28 and I use those for my modulators just
> in case. That's why I'm put off by two *forced* adjacent channels.
>
I use the Triax TMB2000 to channel shift from the TV aerials to free up
ch 55 & 56 and resolve co-channel transmitters ..... (before Mux 8 got
closed) from both Sandy & Oxford
So CH 55 and 56 from both Oxford and Sandy got shifted down to Ch 28, 30
and 38 and 39...... (and I have Sutton Coldfield, Oxford, Sandy Heath
and Waltham all combined here)
So if you can get a cable up with the modulator outputs onto one of the
spare aerial inputs, it s a doddle. :-)
S.
0 new messages