Haha.. Coz my subscriptions is Lite plan.. So if I convert to Njoi, next time got siki duit or "handy itchy" then cannot upgrade to Lite already.
Eventually my old folk house using normal astro (as I explained to you already terminate) while my bro house using njoi... I don't have plan to change njoi bcoz sometimes astro will offer bck something to me.. (Depend their mood..) you know what I mean lah.. So not need so obviously...

But this mth receive a call from astro about my njoi (which is at my bro house) offer me a starter pack rm25 without any contract... So quite attractive include all chinese pack, then hand itchy agree to change it...

Nw only the old house there issued there... Although got unifi, bt my old folk ppl don't know hw to use the tv box... So far only my hand or eyes itchy open tv box to watch unifi.. Bt now most of the channel like animax, red hbo everything ceased... Ntg to watch already..

That why wanna to use MYTV combo box to utilize the astro dish... But since you say only bahasa indonesia channel, then no comment about it.
Yes, I got the C Band dish which is at Chinasat 6b.. Damn it, that means this MYTV combo box only support for Ku band, right?

IF you wan the MYTV Combo box, I can sell to you...(IF you don't mind..) hahaha.. I just need some money for their old folks expenses.. (PM me then we can further discuss.. )

So, i received a mux around ch36-40 in Permas Jaya area in JB that transmits 1 channel that displays nothing. What could that be?

Do you try the manual scan option on your TV?

The myFreeview/MYTV frequency for MUX 1 is Ch 45/666MHz (TV3, 8TV and others) while for MUX 2 is Ch 43/650MHz (RTM channels and others) in your location.

Try repositioning your Greentek antenna first to other location during manual scan while tuning for RTM channels. You will find a spot in your house where both multiplexes are receivable.

There is no need for separate myFreeview/DVB-T2 set top box as your LG TV already has DVB-T2 built in.

Actually there are 3 "hidden multiplexes" (actually on 578/594/602MHz or Ch 34, 36 and 37) which are transmitted from Singapore, this is in addition of Mediacorp's and myFreeview DVB-T2 terrestrial TV service, which are the services that we could receive using antenna. I suspect that this may be the MUX carrying StarHub DTTV pay TV service (meant for businesses), which such signals are designed to be unable to tune on normal TV/Set top boxes despite the signal availability. It has to be tuned on special equipment.

So, i received a mux around ch36-40 in Permas Jaya area in JB that transmits 1 channel that displays nothing. What could that be?

Actually there are 3 "hidden multiplexes" (actually on 578/594/602MHz or Ch 34, 36 and 37) which are transmitted from Singapore, this is in addition of Mediacorp's and myFreeview DVB-T2 terrestrial TV service, which are the services that we could receive using antenna. I suspect that this may be the MUX carrying StarHub DTTV pay TV service (meant for businesses), which such signals are designed to be unable to tune on normal TV/Set top boxes despite the signal availability. It has to be tuned on special equipment.

So ch37 has been used before but its closed down when sg changed to dvb-t2, i wonder what they would do with the restarted carrier/channel/mux?

Maybe msia can use the lower ch21,23,25 for dtt in southern Johor for broadcasting because it's interference free?

PS: actually ch37 overlaps with the astronomy band (605-615Mhz) by a bit but not completely covers it (ch38 overlaps by a large margin, however). Probably oversight from Singapore I guess.

About @shaun_kok comment on Starhub DTTV, I've found a blurb about it on Wikipedia, but nothing else, so it's probably a rumor/concept.

I got the info that the purpose of the 3 muxes from Singapore are actually T2-MI.
For those who don't know, one of the main purpose of T2-MI is for "easier" deploying Single Frequency Network (SFN) where it makes sure the digital TV signals along with main and repeater transmitters are in sync and transmits the exact identical DTT TV signals at the same time.

Avoid open this spoiler. You might get headache 
That picture you attached is outdated... Here's the latest and updated one:

See the ones highlighted in red? That's signal interference with 2 Indonesia's analogue TV channels, RCTI and SCTV.

About the lower CH 21, 23, 25 frequencies can be used for Malaysia DTT, it is unknown to the public as in why MYTV and/or MCMC don't want to allocate it onto those frequencies. As what i know, those frequencies are vacant now.
Btw, the allocation for radio astronomy on Channel 37 is mainly applies in the United States, Canada and Mexico.
https://en.wikipedia.org/wiki/Channel_37 

I think Asian countries didn't reserve/allocate that frequency for radio astronomy also...

CH.50 and above still available despite of putting mobile signal on 700MHz range?

Well, it is greyed out....
Most of the analogue TV broadcasts in Batam area is still up and running. Although 700MHz for mobile use is already part of their plan, but their analogue switchover process will still take years from now to complete due to many reasons and "chaos" going on in implementing DTT nationwide.

So until then, 700MHz will still be used for analogue TV, but definitely not digital TV.

I got the info that the purpose of the 3 muxes from Singapore are actually T2-MI.
For those who don't know, one of the main purpose of T2-MI is for "easier" deploying Single Frequency Network (SFN) where it makes sure the digital TV signals along with main and repeater transmitters are in sync and transmits the exact identical DTT TV signals at the same time.

Avoid open this spoiler. You might get headache 
That picture you attached is outdated... Here's the latest and updated one:

See the ones highlighted in red? That's signal interference with 2 Indonesia's analogue TV channels, RCTI and SCTV.

About the lower CH 21, 23, 25 frequencies can be used for Malaysia DTT, it is unknown to the public as in why MYTV and/or MCMC don't want to allocate it onto those frequencies. As what i know, those frequencies are vacant now.
Btw, the allocation for radio astronomy on Channel 37 is mainly applies in the United States, Canada and Mexico.
https://en.wikipedia.org/wiki/Channel_37 

I think Asian countries didn't reserve/allocate that frequency for radio astronomy also...

Oh. I finally understood why the 3 "Hidden" multiplexes are there. It is meant for syncing purpose with the main DTT network on 538/554/570MHz and Ch 29/31/33. It is too technical for many (except broadcast engineers) to understand it. Still a inefficient way of spectrum use (But for Singapore's side, it is not really a issue, given the low amount of terrestrial TV channels)

I got the info that the purpose of the 3 muxes from Singapore are actually T2-MI.
For those who don't know, one of the main purpose of T2-MI is for "easier" deploying Single Frequency Network (SFN) where it makes sure the digital TV signals along with main and repeater transmitters are in sync and transmits the exact identical DTT TV signals at the same time.

Avoid open this spoiler. You might get headache 

The T2-MI signal provides the broadcasting parameters and contents to the modulators.

About the lower CH 21, 23, 25 frequencies can be used for Malaysia DTT, it is unknown to the public as in why MYTV and/or MCMC don't want to allocate it onto those frequencies. As what i know, those frequencies are vacant now.

from here

So with all of your talking, T2-MI is kinda like a sync signal in analogue TV used by the receiver to build up the T2 mux/channels and provide correction if necessary.

And the particular use in Singapore's case is transmit to 2 sets of muxes to the rebroadcaster (SFN relay) and let them to use the higher numbered muxes to sync up the 2 sources to be rebroadcasted, in a sort of genlock situation but you're trying to sync a video signal to another identical signal and output that without delays.

Am I all right?

Yeah, dunno why mytv wont chose the lower channels in the first place...imo it should be placed there because that allows reception of my/sg channels with group A aerials and with good coverage bc they're all in lowband UHF.

But then, frequency restacking exercise for Mux 2 has been carried out not long ago (698MHz >> 650MHz).

One thing for sure is, if MYTV/MCMC wants to allocate CH 21, 23, 25 for DTT broadcasts, that could also means, all Malaysia DTT viewers in JB and perhaps some from Singapore and Batam area will have to retune their digital TV sets once again.
For those who uses digital TV box or IDTV that doesn't support auto update on the channel/frequency list (including certain MYTV box models), will have to manually perform auto channel search by the viewers themselves, or manual search by entering the exact new frequencies.

That's not all. Those MATV systems (centralised antenna installed in buildings like condo, apartments...) will have to be retune/reconfigured by MATV technicians, otherwise the viewers/resident of the entire building will lose TV reception as it migrates to the new TV frequency.

All of these, equals to more trouble and even costs. 🙃
A thorough planning needs to be done

But this makes me wonder, why they "duplicate" another mux just for T2-MI? Let's say if the T2-MI muxes are not there (CH34, 36, 37), does it means their SFN will not be efficiently deployed? How would it affect the overall SFN deployment in Singapore and why is it so important for them until the extent of duplicate another mux just for that purpose?

And that also makes me wonder whether does Malaysia's MYTV transmits a duplicate muxes just for T2-MI?

MYTV uses TM Fiber connection and ABS-2 Satellite to deliver terrestrial signals across their masts. So there is generally no need to duplicate the MUX if SFN is adjusted accordingly.

Singapore's case may be a little bit different however. Mediacorp may not use full fiber to distribute their channels across masts scattered throughout the island (except for Bukit Batok transmitter and maybesome others, which we don't know the exact location of the transmitter), so a syncing transmitter via DVB-T2 MI may be required.