Interesting question with unusual results. My edge of reception has an SNR of -14 dB with my lock coming and going. When I put the cone on the LNB at that point and aim it along the LNBās direct axis to the sky, I get no change in SNR or Lock/Unlock status. But if I turn the cone in the direction of the satellite in the sky without moving the LNB, I get constant Lock and my SNR shoots up to - 9.5 to -10 dB.
I also got the same results today with the LNB pointed correctly. Without the cone, my SNRs were in -12 dB range with constant lock. With the cone over the LNB, pointing to the satellite, my SNRs went up to the -8.5 to - 9.5 dB range. What I did notice today (which I wasnāt looking for in my first test), was with correct LNB orientation, I could get the SNR to go into the -7.5 dB range by just sweeping the cone a bit in the general direction of the satellite.
Are we talking wave guide here, or still noise reduction? Ken
possibly the only way to decide which happens if one put the LNB into a spectrum analyzer (powering up LNB via bias tee). Usually the interference is increasing noise floor which clearly can see on spectrum analyzer plot (eg.: rlt-sdr can do this possibly). Also if the interference is some discrete peaks that can identified too.
IMHO I bet the cone extension is simply increasing horn antenna apperture size so increasing gain. (On the other hand this means more narrow beam, decreased side beams which helps against interference signal receptionā¦)
Quite hard to deiced, perhaps the spectrum analyzis can help. (rtl-sdr might work, if it doesnt have local self noise at that part of the spectrum, a priori good to check noise floor, without anything connected)
Iām almost done with getting my DreamCatcher powered over Ethernet. The TP-link Ethernet dongle works in place of the Wi-Fi dongle. I have some construction to do for running the Ethernet and coax through the plastic box and installing the PoE hardware. It should be up later during the week.
I will be ready to investigate antenna changes from there. I do have an SDR collection. I doubt that I would be able to see the Outernet Signal because itās buried under the noise floor.
I doubt that I would be able to see the Outernet Signal because itās buried under the noise floor.
Yeah, exactlyā¦ this makes the evaluation quite hardā¦ With some luck maybe surrounding sat channels maybe stronger and can see just a bit above noiseā¦ But Iām not expect much stronger power on others, need to check.
@kenbarbi, how would we deal with water accumulation in the cone? Currently, we are receiving a lot of moisture, this would be a mess here. Our air quality is often poor, and we have a large accumulation of very fine sand dust in the air on a regular basis, so Iām wondering if there would be a way to put vent slots just above the attachment area to divest it, without affecting the operation.
Iām not sure if it is a wave guide, as a microwave engineer would describe it. But it does seem to be creating a larger antenna aperture, so more antenna than just simple shield. Iām not even sure that a āshieldā could even work in the way we are talking about.
Iām going to try 2 things: 1) Wrapping aluminum duct tape around the LNB cover with little drip holes in it, and 2) A copper or aluminum window screen shaped like my cone. Ken
Doing a screen here in Washington State will simply become a receptacle for squirrels hiding nuts, pine cones, moss growing inside, a nice bucket for ferns to start growing, wasp nests, humming bird nests, etc.
Seattleās nickname is the Emerald City because there are so many trees here. Trees come with all sorts of wildlife that enjoy a little basket to nest in, especially during spring