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24.150.11.85
What causes this? Is it due to the coax not being grounded as I have not quite completed this part of my installation yet,but would like to know the cause.I did not have this problem when I had the antenna
3 ft. off the ground ,but now that it is thirty feet up I have better
reception but much static and noise.Any help appreciated.Duane Upshaw
Follow Ups:
Tandy 'should but don't' sell them anymore.You may need to put a spike-type VDResistor one that goes open circuit at fairly LOW signal levels but recovers - in the centre feed-line - for wind-caused static charges. Its a long enough boom to do that.
AM 'random' wire antennas also suffer from this and mine is suppressed for both static* and lightning, *coupla DC light bulbs can do this. OR A 3 terminal gaseous supressor, which will safely do both.
Buy/borrow a copy of "Joe Carrs Receieving Antenna Handbook".
You really must earth the coax down-leads outer shield, in any case as well.
Run it to a copper coated earth post, banged in to the ground, with car battery woven strip is best. OR If you have a copper bath or a fir bit of some copper pipe, bury it after attaching all the drain wires. Eg from the tuner's ground post, as well. If you still use vinyl run a wire from the TT's earth wire post on the pre-amp or integrated to the buried copper rod/thing.
Tie the wires to the system together and put a three terminal suppressor across the run _ _|_ _ run a lead from the third end to the buried/buryable earth.
AND, JIC, consider buy a small blade-switch to interrupt the coax outer and inner paths to the tuner. indoor bit of the earth path - for when it's thunderstorming or when you are away.
IE Buy a good indoor lightning interruptor, through which the coax from the wall goes at the very least.
Also run similar wire from the mast's metal itself, use a brass clamp, on a proper electrician's earth rod 8ft of copper coated steel. Bang in the post post directly underneath the mast. Clean the metal surfaces wire end and clmap, close it all up reall tight, and spray over it with waxoyl or the blue battery terminal paint.
Check it all every year.
WarmestTimbo in Oz
The Skyptical Mensurer and Audio Scrounger'Still not saluting.'
Read about and view system at:
http://www.theanalogdept.com/tim_bailey.htm
I do have a ground rod below the tower in the ground about 5ft long.
This is the rod that delhi sells.It is attached with a heavy cable
to the tower and the tower itself is in the ground cemented in about
15 inches,so it should be well grounded.
However I am still installing satelite dishes on the tower as well
and so have not quite completed my installation.I still need to ground all the coax from my antenna and the dishes.I have run an aluminum 10 gauge drain wire down the tower and was going to attach
this to the tower as the tower is already grounded.But I guess I
could drive in another rod.
Just so I am clear the function of those gas tube units(discharge units) is to protect the tuner from lightning and also to suppress
static caused by wind?They do both.
I have located several sources for these units by the way.Another
source for them is from"Cushcraft" and another is "Furse".
I noticed the other day while listening during a rain storm that the static was not there,so I think this is in fact wind static and the
noise is caused by the coax not yet being grounded.Duane Upshaw
keep up the high standards, doood!{;~)}
WarmestTimbo in Oz
The Skyptical Mensurer and Audio Scrounger'Still not saluting.'
Read about and view system at:
http://www.theanalogdept.com/tim_bailey.htm
Another thing to consider and you don't mention is antenna type. For example a vertical quarter wave will pick up a strong signal but it will pick up everything else too since for all practical purposes it isn't directional. That directionality can be critical for blocking stations which are close in wavelength but way off in geographic proximity compared to the station it is you are trying to pull in.Or: maybe the selectivity of the tuners recieve filters isn't the best and now that you are pulling stuff in from afar with a REAL antenna setup this problem has reared it's ugly head. Not being familiar with your tuner I won't comment on whether I think it is that. Usually though a tuner specialist can add higher Q lower bandwidth filters for a noticeable improvement in selectivity when this is what is causing the problems.
Also it could be a combination of things like I mentioned.
BTW usually it is pretty difficult to overdrive the recieve circuitry on most modern tuners due to the AGC circuitry being built in to protect from that. Of course it isn't impossible it just takes some pretty extreme conditions with most equipment.
In my experience it is easy to tell if you are in fact clipping the front end. First of all watch the signal strength meter. When the front end is being overdriven the S meter will be pegged. The signal will swamp all other signals in that band. You start to hear a distortion of the voice somewhat similar to what overmodulation on AM sounds like. I have never experienced excess static as a result of being overdriven just the loud distorted signal.
tuner now that you have much more gain. It's also possible now that you're getting some interference from multipath signals. You don't say what tuner you're using or where you're located so it's hard to tell.
I have a Magnum md102t.I doubt very much that it is overloading.
It definitely sounds like some kind of interference.Powerline or static.I know there are many types of discharge units available for
grounding static.I just would like to confirm that this is what I am hearing.Duane
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