Hf Base Antenna

[Celedonio Miranda]

Novalue may be entered in the antenna height, as the antenna height is already shown in the Rinex file and thus already calculated. You have to enter a 0 here, then the height will be calculated correctly. I also have a request for this to be made by Emlid.

RINEX header usually contains several meters-accurate coordinates. And the height in it, as @dieter.buchholz rightly pointed out, usually includes the antenna height. Did your CORS provider transmit the precise ARP coordinates in the RINEX header?

When entering these values, I could imagine a sketch where all parameters that are already used automatically (all from the Rinex file) are already permanently entered. That would explain the whole thing much better and there would be a lot fewer errors.

Thanks everyone for taking the time to think about this.

I guess having knowledge of how the pieces fit together is one part. T

The other is how Emlid Studio handles data/information and whether those bits of info (e.g. antenna height), and how they are presented in files are consistent (which I thought they were meant to be).

Christian is absolutely right that 0.055 m is the heigh of the ARP over the marker. So in the standard workflow, it should indeed go to the Measured heigh field. And as Dieter mentioned, it appears there by default - Emlid Studio read it from the RINEX header.

If I am running in real time and receiving RTCM 3.2 from a CORS station which outputs in a nation specific geodetic datum (in this case NZGD2000), will the *.LLH produced with raw logging be in NZGD2000 or remain in WGS84.

For all those looking to establish a fixed CB radio station at home or at work, look no further than our collection of CB antenna base stations to get your system set up! Providing more reliable communication over longer distances compared to mobile systems, establishing a base system is critical for professionals and enthusiasts who depend on long range communication. With a plethora of options from different designs, builds, and power, we have compiled the best CB base station antennas for your setup. Browse through our collection of CB antenna base stations and find the right one for you today!

The most popular type of antenna we sell, fiberglass antennas are extremely durable and can be mounted just about anywhere when paired with the right mount. A great choice for pickup trucks, off-road 4x4s and heavy duty mining / construction equipment.

Magnetic antennas offer solid performance, an easy installation and include everything you need (coax, mount & antenna) in one package. They're perfect for pickups trucks, SUVs and cars. Durability is their only downside as their thin, metal whip won't last long if it's frequently getting hit or snagged.

Popular with big rig drivers, center load antennas offer outstanding performance while offering extreme mounting flexibility. Most commonly used on semi trucks or vehicles that stick to the asphalt. Not recommended for heavy-duty or off-pavement use as they are prone to break when impacted.

The most popular whip model is the classic 102" whip, which offers the absolute best performance from any mobile CB antenna on the market. Shorter whip versions are available, too, if 102" is just too much but you like that classic whip look.

Setting up a home CB base? You'll want a base station antenna. Designed to be permanently mounted to a building or mounting pole, these large antennas offer significantly better performance and range than shorter, vehicle mounted antennas.

I'm setting up an 50W Base Station, mounding antenna 15 to 20 feet on roof top. Are there large Base-Station antennas that can be roof mounted and what are the largest types for maximum transmission/reception?

You would likely have to look into commercial UHF antennas, but I remember a local that had a 25' tall antenna mounted to his chimney for GMRS. He had some fair range off of it to but I cannot remember what brand it was or anything else about it.

The LARGEST UHF Base antenna available without special order are 16-bay dipoles. On special order you can get a 32-bay dipole. The real question is how much wind load your roof mount can handle and how much you are willing to spend.

i was wondering that too...i'd been kind of monitoring the post, "best performing" within cost (and maybe size) contraints" would have been my first thought too, but i thought i might be missing something.

Mounting a 20' Mast on my 20'(off the ground) roof, now seeking the BEST performing and TALLEST GMRS antenna I can purchase. I have seen many antennas on the net, but nothing with outstanding gain. Any input?

A cheap antenna high in the air and above the trees and other obstacles will almost certainly outperform a premium priced antenna mounted low to the ground surrounded by such obstacles. Remember, antenna height is your friend.

So ... for maximum reception and range, you'd want a Yagi or Reflector type on a 20' mast and a rotator, then you can point and shoot with it, or to build and tune it yourself to your exact specifications.

Assuming you want a more normal COTS omni vertical antenna, then I'm going to be pretty simple about this: grounding/radials/the second half of the dipole and getting the height above the antenna's ground plane, as well as accounting for any obstacles (including rain gutters and guy wires) to be correct is more important than the nominal dBi gain of the antenna itself. Something like that J-Pole above (they also exist tuned for GMRS) or with radials will do pretty well in this situation, as well as folded or vertical dipoles, or some other good designs.

But 50W into a cheap radio just simply isn't much power or selectivity to work with, be stuffing into one of these no matter what you do, and you're going to hit tropospheric propagation limits or receiver selectivity limits at maximum legal antenna height well before you run out of antenna gain.

To put it simply: with the current quality of GMRS radios and antenna height restrictions, any decent commercial vertical omni for the 460-470 MHz range, installed correctly, is going to perform about the same. Choose based on what is going to work for your location rather that what has the theoretically best dBi or dBd, and read the manufacturer information (and maybe the ARRL Antenna book). If you really want high performance, you'll build the antenna yourself.

Diamond and Comet are the two top brands I use for both base and mobile communications. You won't go wrong with the Comet 712EFC or the Diamond x300. They are both designed to perform well on the top end of the band. I have the x50 and the x200 and have posted real-world SWR and performance data from my system in the past.

The GP-1 doesn't have the gain that the 712 and the x300 do. Its 6db compared to 9db. If you life in an area that doesn't have a lot of tall hills or mountains, I would go with the higher gain antennas.

The 205 is a discontinued antenna that has a very narrow bandwidth and has to be tuned to the center frequency you want to use it on. The x300 has almost double the bandwidth without having to tune it.

He is probably stuck with old inventory, which is the only reason I can think of that a shop would suggest a discontinued antenna that doesn't perform as well as a no-tune required, current production model.

Hi, I am interested in using GMRS frequencies, mostly simplex now & duplex in the future . I'm also possibly interested in 2m/70cm ham bands in the future. For now I will be using an HT connected to a base antenna. I'm trying to find an appropriate base antenna (preferably a vertical) which I can use for all the above with acceptable SWR. And hopefully just do this antenna & coax thing once. The repeaters are all close enough to me that I dont expect them to be an issue with any base antenna. The trick is going to be using simplex. As, I live in a small valley, and areas that I want to be able to simplex to outside that valley. Though they are mostly 5 miles or less, I expect it may be tough (also base on my trials with an HT). I think the best I can do with mounting height is a 35 foot telescoping mast (which someone gave to me). Oh yeah, I forgot to mention that I live in a hollow within that valley (if it sounds like southeast Tennessee , it is). I have been researching antenna manufactures websites & many forums for the last several months, I have more knowledge than before I started, but still cant pick an antenna. I have seen on several forums people stating that they use a 2m/70cm antenna (rated only up to 450mhz) & that they stall have SWR at or below 1:5. The other issue is that I need to stay below $150.00 if possible. Though if the perfect antenna for me was a little more, I would like to consider it. I have read if you live in a hollow it may be best to pick an antenna which has a "higher angle of radiation) or "take off angle" so, as to allow the signal to shoot over the surrounding hills , vs. bounce off them if the signal is shooting straight into the hills. So, possibly a plane vertical vs. a vertical with ground plane ?

3a8082e126