My sister and I live about 15km away from each other and are writing our exams this month. About 60% of the distance between us passes through buildings., and 40% is farmland. She has an 8W UV-5R and I have a 10W UV-S9+ for now.

From what I've found on the internet, it doesn't seem likely that any handheld antennas would be able to span the distance. There are some base antenna options that I've found such as the Tram 1410, but they are all rather expensive. Would it be more cost-effective to make my own from hardware-store materials, if possible? We both have the capability to mount the antenna on our roof.

Thanks!

Hello everybody,

Can you please suggest an omnidirectional long range WiFi antenna or any technology/scientific group working on such project?

From 1 Km to 5 Km.

Thank you.

Wasn't able to find the answer via Google, and the in-game encyclopedia wasn't particularly informative either. I've noticed when I scan a new system for the first time, I'll sometimes get questions marks behind my ship, on the map, which would suggest the scan pulse is omnidirectional. But when I receive a mission to locate a missing ship via my long-range scanner, I have to be facing in the general direction of the ship. So I was wondering is the long-range scanner pulse is omnidirectional, or not. If not, then what is the scanning arc (45, 90, 180 degrees, etc)?

Thanks for any clarification :)

Summary of Publication:

> Head-related transfer-functions (HRTF) are a central part of spatializing audio. However measuring the near-field HRTF at close source distances presents unique challenges. In particu-lar the existing sound sources designed to be appropriate for near-field HRTF measurements on human subjects exhibit a notable issue of being unable to generate a sufficient acoustic output level at lower frequencies (below 300 Hz) while keeping a proper omnidirectional directivity pattern at higher frequencies. This paper proposes a novel design to overcome this limitation of low-frequency range. Several aspects of the design were considered in the paper: type of enclosure, low-frequency extension, choice of transducers, and metrics for sound source assessment. The chosen solutions are discussed together with numerical and experimental verification. The source constructed under the design method and process described herein achieved a frequency range of 120–16,000 Hz for which it can be used to measure HRTFs at source distances as small as 0.15 m from the subject’s head.

• PDF Download: http://www.aes.org/e-lib/download.cfm/21037.pdf?ID=21037
• Permalink: http://www.aes.org/e-lib/browse.cfm?elib=21037
• Affiliations: Facebook Reality Labs, Redmond, Washington, United States; AGH University of Science and Technology, Cracow, Poland; Facebook Reality Labs, Redmond, Washington, United States; Facebook Reality Labs, Redmond, Washington, United States(See document for exact affiliation information.)
• Authors: Chojnacki, Bartlomiej; Terry Cho, Sang-Ik; Mehra, Ravish
• Publication Date: 2021-04-30
• Introduced at: JAES Volume 69 Issue 5 pp. 323-339; May 2021

How could I get the most range out of my HT? What have you done that yields good results? Assume that I have an emergency situation and cannot contact any repeaters.

The obvious answer seems to be 'get as high as you can to extend line of sight.' I'm open to just about anything. I could chuck a rock up into a nearby tree and sling up a j-pole. I could raise a 30 foot mast from the hitch receiver on my truck and top it with whatever antenna provides the most gain. I could get totally weird and hang an antenna from a 36" helium balloon and tether it at a height of up to 400 feet, but line loss from the coax, and it's weight would have a practical limit.

Have i missed anything? Thanks.

Edit: Thank you all for the great responses! One of the wonderful things about this hobby is the 'I tried this and it worked' attitude, and the willingness to try even seemingly goofy ideas if it might lead to success.

I am excited about things to come.

73

https://preview.redd.it/f5yfog4lbhy51.png?width=1196&format=png&auto=webp&s=cc69dbf3a3ea2d95780a7d99d92f58b2639d1b7b

Designed by Sam Jewell, G4DDK and Kent Britain, WA5VJB

You can take a look and review the schematic diagram here: https://www.flux.ai/jharwinbarrozo/ultra-low-noise-amplifier-for-vhf-and-uhf

https://preview.redd.it/87k0eu2sahy51.png?width=1256&format=png&auto=webp&s=76b472467f62031873d524e7f0db6e95830ec74c

https://preview.redd.it/8lewjmw1bhy51.png?width=1262&format=png&auto=webp&s=ca943680529e492a7d08afa1e4eea56abc017384

I’m trying to setup a remote station at my house where I can have reliable coverage of my school for demos of APRS (my area has low coverage), EchoLink, and any other interesting ideas. I measured the distance to be 1.84 miles, which doesn’t seem to far, but I haven’t been able to get any signal through. My home setup is currently a J-Pole with my 706mkiig at about roof level running 10W, at school I have my FT3D with a Signal Stick antenna. Thanks for your suggestions!

Hello everyone! I've had this issue with my home station since I put it together and neither myself or members of the local club can figure it out. My bedroom is on the 2nd floor of my house and that's where I have all my radios. I purchased a J-Pole from KB9VBR to install in my attic. I used it in the field once and it worked fine.

I ended up placing the antenna between 2 wooden studs in the attic on the south side of the house and ran 25 feet of LMR-400 into my bedroom where I have a 6 foot piece of RG-8X connected to the radio so it can sit on my desk (LMR-400 is not very flexible). I have roughly 2:1 SWR across 2 meters.

I enjoy 2M simplex and I have made plenty of contacts around the area but I always have 1 problem: I can't hear them but they hear me full scale. Today, I called CQ and I heard a mobile station, all I was able to get was their call sign but that was very painful to do, they were so low in the noise floor. I got a hold of them on Facebook later and I was told they were receiving me at close to full strength and they were close to 20 miles away from me but I couldn't hear them at all. I have this issue with every single 2M simplex contact I make regardless of whether they are a mobile or base station.

Like I've said earlier, I asked people at the local club and they are just as confused as I am and have no ideas. I've tried 4 different mobile radios and the problem follows. I know RG-8X is quite lossy on VHF/UHF but I thought this would screw me over on transmit and not receive or am I wrong? I've been considering installing a Comet GP-3 in it's place but I want a second opinion. I do have the option now with my newest radio to put the radio body in the closet connected directly to the LMR-400 if that's the problem. Thanks!

I was told: UHF is best for urban areas or inside the building as it penetrates well thru the wall than VHF does. But, VHF travels a lot further outdoor with lesser power than UHF.

I am wondering if tested outside --let's say in a state park, given condition is equal -- distance, obstruction, radio power output; how much further VHF signal will reach than UHF? Any ballpark number?

I've seen videos of people testing their Baofengs and they get great range (a mile or more) on only 5W. I've got a F8HP (8W) hooked up to a 35ft tower I made with a dipole on top. My meters reads 8 watts at the transmitter and my SWR is 1:1.1. I know I got some amount of line loss since it's like 55ft of coax. My problem is, I can only reach about 3/4 mile down the road. I'm using a UV-5R to receive. There are a lot of trees where I live, but would that really bring my range down that much? My question is, what kind of range should I really expect with what I've got? And what kind of distance have any of y'all gotten on low power 10W or less (without skipping the signal)

And yes, I have tested my F8HP with just a mobile antenna and the range is even worse.

I live 13 miles from all the antenas I need in l.a. all are in the same mountain and i currently have a winegard 5500 antenna.

I get the uhf no problem but the high vhf are a bit flaky. What's a good antenna to try... I only care about the networks CBS, NBC, abc, fox plus 9.1 and 13.1. so u think it's really a matter of high vhf

Tvfool report tvfool

Apparently the active modules only apply their bonuses to drones in space, and using "show info" on drones in space only displaces unmodified stats.

Womp womp.

Not the end of the world for EFT warriors and spreadsheeters, but annoying for on the fly tinkering and more casual players.

I was wondering what your thoughts are about the move to 360/Omnidirectional wireless speakers versus wireless stereo speaker sound is. Seems many of the manufacturers are moving to put in some kind of omnidirectional speakers in their lineup rather than stereo chassis any more.

I'm being told that omnidirectional treadmills only work with Steam. I'm just wondering if anyone knows a way to make them work with oculus games as well... specifically Horizon Worlds.

I know that RFID is used in very large warehouses, and they have models that will clock a signal from hundreds of feet away. This of course, requires a large power source.

I'm trying to build a 'Biometric scanner' for an airsoft gun. The gist of it is that a person wears an RFID wristband on their shooting hand. In the stock of the gun sits an RFID antenna. When the owner is holding the gun, it can fire. When someone else is holding the gun, it can't. Not much practical purpose for airsoft but I figure it would be kind of cool to make.

The problem that I'm running into is:

1. All RFID tags/transmitters that I find on arduino-friendly sites seem to have a range of a few centimeters. (In theory this could work if the reader was in the grip of the gun, and the chip+antenna were in the palm of your glove. This is prohibitive for me because the gun's motor sits in the grip)

2. All RFID readers that I can find seem to have a very directional patch antenna. The stock of the gun is not very wide, so orienting the patch antenna to face down is pretty prohibitive as well. Based on the beam pattern I think a monopole would be ideal for this situation, but I can't seem to find an RFID reader that works with one.

Usually I google search these things but I'm having a hard time finding anything because any search for omnidirectional RFID readers returns warehouse grade hardware the size of a lunchbox. I don't need anything super powerful, just a readable range of ~1 foot. Does anyone have any experience in this?

Hey guys new HAM here KK4YFD. I'm looking to possibly build/buy a yagi antenna seeming as it is directional and will offer more range. I'm specifically try to reach long distance at 147Mhz range, hopefully to 100 miles. But alas it is difficult to find standard information, and being new to the field I don't have that much hands on experience.

My questions are: Is it feasible to hit this range with a yagi type antenna? What is the minimum wattage I should be looking for in a radio to get this range if it is doable?

I get on with a nightly net using echolink but it would be nice to hit the repeater radio only just because i can and would love the project/challenge.

73

I am working as train driver and I would like to protect my ears with something quality as 3M Peltor provides but with the built-in radio station. I tested 3M Comtac XP headset with inapropriate transmitter/receiver. I hated the amount of cambles mounted on me. So I am looking for headset which has built-in radio, offers high quality noise reduction (Peltor) and has the frequency ranges UHF and VHF.

No there's no subreddit focused on heavy duty headsets.