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What Channel And Frequency To Use For A Dvb-T Modulator


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#1 pheggie

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Posted 30 June 2015 - 10:27 PM

What channel and frequency to use for a dvb-t modulator in Melbourne do you recommend?

http://www.ebay.com....=STRK:MEBIDX:IT



#2 alanh

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Posted 01 July 2015 - 01:22 AM

What suburb are you in?

I ask this because every block of 6 channels are used either in Melbourne or for high power transmitters in Ballarat, Bendigo and Tararalgon.

 

looks like http://www.matchmast...pment/14mm-dm05 If it is then use 212.5 MHz (Channel 10) with a 7 MHz bandwidth. If the output filter is not narrow enough then use A UHF channel which will depend on your location.

 

Alanh



#3 pheggie

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Posted 01 July 2015 - 02:31 AM

Thanks Alan I'm in Frankston 3199 what do you recommend for UHF by the way?



#4 alanh

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Posted 02 July 2015 - 07:36 PM

Pheggie,

The stronger signals in your area are Block A channels 6 - 12 from Mt Dandenong and Block block D channels 40 - 46 from Arthur's Seat, Block C channels 34 - 39 from Upwey and Selby. Very high power from Mt Tassie block B channels 28

- 33 Geelong is block E channels 46 - 51. These are all the available TV channels with those from channel 52 and above for 700 MHz Wireless Internet which is only starting this year.

 

I would use channel 51 or (channel 32 after "channel 31" goes off the air and on to the internet. These channels are unallocated at present and the Geelong signal is not strong enough to reach you over Port Phillip Bay. Mt Tassie has a terrain blocking.

 

Alanh



#5 pheggie

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Posted 02 July 2015 - 08:37 PM

Thanks Allan for the help much appreciated



#6 beeblebrox

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Posted 06 July 2015 - 05:13 PM

Pheggie,  Is this in a domestic or  commercial situation?  

 

I would ensure that I wasn't getting any uhf from your antenna and use whatever you want as you're unlikely to be getting a strong enough signal to cause interference                    via your cabling.

 

That said I'd stay away from block D and E.   usually anything from 27-31 is pretty safe around melbourne but I have sites with 40+ modulated channels and if they are filtered and mixed properly you don't have issues



#7 steveb

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Posted 07 July 2015 - 08:59 AM

If you use Channel 51 you are more likely to suffer LTE interference on the channel from handsets. Best to stay away from the high end of the band



#8 beeblebrox

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Posted 07 July 2015 - 05:59 PM

The towers are a bigger problem than the handsets it appears ...   we have seen 70-80dBuV at around the old Ch62-63 which if not filtered and then amplified typically overloads many amplifiers and receivers 



#9 pheggie

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Posted 07 July 2015 - 06:36 PM

It's for home use I'm using C51 and injecting Modulator in to my aerial system with a splitter using output as input in reverse haven't noticed any reception issues in any channels



#10 beeblebrox

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Posted 09 July 2015 - 10:00 PM

As lte rolls out that may change but if it works then that's what matters.