Page 1 of 2

Is off air lip sync possible?

Posted: Sun Apr 02, 2023 11:19 am
by Basil
Is there a way to set lip sync on a video to be transmitted without actually going on air to do so? If so, how please?

Also why might two downloaeded videos from the same source that show on say YouTube as perfectly in sync be wildly different when transmitted? Thanks.

Re: Is off air lip sync possible?

Posted: Sun Apr 02, 2023 1:21 pm
by g0mjw
Stream to VLC instead of the Pluto or Portsdown? Not sure if this completely works but it is a good way of checking your signal.

Mike

Re: Is off air lip sync possible?

Posted: Sun Apr 02, 2023 5:42 pm
by DL4FBN
another way is to use a MMDS downconverter and take the RF signal from Pluto or lime without triggering the HPA. The RF for Q100 will be converted to UHF which can be received with minitiouner channel B on the corresponding UHF frequency.

73, Reinhard

Re: Is off air lip sync possible?

Posted: Wed Apr 05, 2023 12:19 pm
by Basil
Thanks for the replies. Lip sync set using VLC did not seem to hold good once the same setting was transmitted through the actual Pluto, but it will be another useful tool for checking signal paths, thanks Mike.

I will try Reinhard's idea next, thanks for that!

Re: Is off air lip sync possible?

Posted: Wed Apr 05, 2023 1:32 pm
by DL4FBN
this MMDS converter might do it if you remove the input filter https://www.ebay.de/itm/152128782574
I am using it for all purpose testing as it works like Q100 as long as you control the input power and don't overdrive the MMDS input.

73 Reinhard

Re: Is off air lip sync possible?

Posted: Wed Apr 05, 2023 1:58 pm
by Basil
Thanks Reinhard, I just ordered one to have a play with.

Re: Is off air lip sync possible?

Posted: Wed Apr 05, 2023 3:11 pm
by g8ayc
Why not just tune your Minitiouner to 2.4 GHz?

73 Nigel.

Re: Is off air lip sync possible?

Posted: Wed Apr 05, 2023 4:27 pm
by g0mjw
g8ayc wrote:
Wed Apr 05, 2023 3:11 pm
Why not just tune your Minitiouner to 2.4 GHz?

73 Nigel.
Indeed, it already covers 2.4 GHz. No need for a converter.

Mike

Re: Is off air lip sync possible?

Posted: Wed Apr 05, 2023 6:17 pm
by Basil
To be honest for £8 I fancied having a play with one, never seen one before.

Re: Is off air lip sync possible?

Posted: Wed Apr 05, 2023 7:30 pm
by DL4FBN
I was not aware that the minitiouner can be tuned to 2,4GHz. However my R&S testgear needs UHF input, so the MMDS is doing a good job for monitoring and measuring the RF output of Lime & Pluto for Q100.

Reinhard