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Odd signal issue

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Odd signal issue Empty Odd signal issue

Post by Askit Wed Sep 30, 2020 7:42 pm

Something a bit odd is happening, not for the first time, with our TV signal. We're on site with the TV connected to the external aerial via one of the aerial sockets and getting a fairly poor but acceptable signal with 20+ channels. The teleplus is set on vertical, which is needed locally to get a signal. The odd bit is, if either of us move up to the back of the van we lose the signal. Seems to be illogical but we've tested it over and over again and it keeps happening. Does anyone have an idea of how or why this occurs?


Thank you in advance to all those who want to suggest us not moving to the back if the van  snigger  

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Odd signal issue Empty Re: Odd signal issue

Post by modelman Wed Sep 30, 2020 7:48 pm

Sounds a bit like your 'bodies' are acting like part of the antenna,  similar to the old ign-key to the head syndrome! hugegrins

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Odd signal issue Empty Re: Odd signal issue

Post by roli Wed Sep 30, 2020 8:59 pm

We get interference on the TV picture if Liz walks past it, I dont seem to affect it.   Not an issue at the moment TV is opened up on the bench at the moment has an iffy joint on the DC input socket
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Odd signal issue Empty Re: Odd signal issue

Post by brodco Thu Oct 01, 2020 8:51 am

Hi wave

You’re a great tub of fat and water hugegrins hugegrins hugegrins hugegrins
 
Not meant an insult but as far as RF is concerned it’s true. As such you are good absorber of radio signals.

Several possible reasons but probably:
 
In a good signal area you are getting the signal direct from the transmitter along the direction of the aerial. You may also get a proportion of the signal reflected from the surroundings, but this proportion of the signal is very small and a good aerial will tend to reject them.
 
In a poor signal area you may get little or no signal from the direct line of the transmitter and the aerial is receiving mainly (or only) the reflections. There can be multiple reflections coming in from different directions. When you move around the van you absorb some of the signals and change this multi path reception to the point where the signal drops below the minimum needed by the receiver.
 
Incidentally this is one of those weird situations when a omnidirectional (flying saucer type) aerial may out perform a higher gain directional.
 
Funny stuff RF
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Odd signal issue Empty Re: Odd signal issue

Post by Askit Thu Oct 01, 2020 3:07 pm

Thanks, that makes complete sense. We've had it before but this is the first time it was obvious and we could repeat the signal blocking. I was wondering about making myself a tinfoil suit but perhaps that's going too far  hugegrins We've moved site and getting 100+ channels so it's not a problem any longer.

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