ifindoubt Posted October 10, 2012 Share Posted October 10, 2012 Hi, Having a few problems with a site, where I have installed 2 digital radio mel visbox units, one unit is for a camera in one shed and the other for a camera in another shed, the receivers are both located on the main shed approx 6" apart. I have a cat5 cable running from the dvr to a join, then a cable running from the join to the 1st visbox receiver, and then onto the second. Both receivers are powered separately from different power supplies, however I am using an 8-core to the 1st rec. and then from it to the second rec. both power supplies for the receivers are using the same 3A spur. The problems I am having is major interference on both video signals when both sets of visbox's are in operation, if I disconect one, the other works ok, and likewise if I disconect that one and power up the other it works ok. The both dont seem to work when operated together, I have tried a different 2 sets and still the same problem,and I'm going out to site tomorrow with another 2 sets. Does anyone haveany suggestions to try? many thanks, Jordan Link to comment Share on other sites More sharing options...
digitalwitness Posted October 10, 2012 Share Posted October 10, 2012 Can you put more distance in terms of which channels they are using? Link to comment Share on other sites More sharing options...
ifindoubt Posted October 10, 2012 Author Share Posted October 10, 2012 do you mean locate both receivers further apart? if so would this help and how much further? They are digital tx and rx and apparantly the channel is pre-programmed inthe factory and there is no way of changing the channel, the older analogue visbox had selectable 4 channels. Link to comment Share on other sites More sharing options...
Couger Posted October 11, 2012 Share Posted October 11, 2012 which mel units are they 2.4ghz, 4.8's ? Link to comment Share on other sites More sharing options...
ifindoubt Posted October 11, 2012 Author Share Posted October 11, 2012 i'm not sure off the top of my head, I'm pretty sure they are 2.4ghz though. Link to comment Share on other sites More sharing options...
Rulland Posted October 11, 2012 Share Posted October 11, 2012 Pretty sure they must have selectable channels somehow,wouldn't be much use else. Link to comment Share on other sites More sharing options...
ifindoubt Posted October 11, 2012 Author Share Posted October 11, 2012 they do not have selectable channels according to mel and videcon, as they are digital units they have them pre-programmed at the factory :? The analogue ones you could select channel 1 - 4 the distance between each transmitter and receiver is no more than 15-20metres. and are fitted on the outsides of tin sheds. Link to comment Share on other sites More sharing options...
fozzies Posted October 11, 2012 Share Posted October 11, 2012 Do you have yagi aerials? If so you could polarise one set horizontally and one vertically Link to comment Share on other sites More sharing options...
ifindoubt Posted October 11, 2012 Author Share Posted October 11, 2012 Ill give that a try, mate Link to comment Share on other sites More sharing options...
ifindoubt Posted October 11, 2012 Author Share Posted October 11, 2012 I have installed the 2 new units, before it was a horizontal scrolling type interference, and now it is like a slight ghosting of the image, it has impro ed the overall picture but its not great. Link to comment Share on other sites More sharing options...
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