SteveShannon

I have a friend who is on that system and who has good results.

Gps could also be used at each receiver to time tag signals as received, which could then be used to ensure the comparator is comparing synchronized portions.

Marc, I’m sure you have already seen this but maybe it will help provide background. This is from repeater-builder: “A good voting system is completely transparent when it's working properly - you can't tell it's there except by the superior coverage. Obviously the voter has to be voting identical simultaneous signals, which is why using VOIP (voice over IP, a.k.a. the Internet) as a link to bring in the audio from one or more outlying receive sites usually does not work - there is too much delay and jitter, causing the voter at one instant to be voting the noise between two words on channel one and voting the middle of the previous word on channel two. Manually adding a fixed delay to the one receiver in an IP network does not work either, as the per-path internet packet switching delay is not consistent, even within one transmission, and definitely not from one transmission to the next. Note that there is a lot of incentive to "fix" this characteristic, and a revision of this paragraph may be needed at some point as the technology advances.”

A memory leak like that will eventually cause a stack overflow no matter how much memory you have. The stackoverflow forum link I posted has some suggestions for how you can see what processes are being forked and never exit or killed. Then you (or a programmer if you’re not) will have to figure out why those calls aren’t exiting freeing up their memory. Things to look for are incursion (when a function calls itself), or calling cron from within a loop. Since cron seems to be at the heart of this issue that’s what I would start with. Cron is a scheduler. It only needs to be called once for each scheduled task or fork. It typically shouldn’t be called over and over with the same parameters unless you kill it before calling it. (Which would be sloppy coding!) So, check and see which processes are running. If you have a whole bunch of some dig into why. Good luck, Steve

Thanks! I appreciate the help.

So here’s an email I received today that I think illustrates how seriously some here in Montana take this. Unfortunately I don’t have any of the prerequisites for this training: “One of the reasons the Amateur Radio Service exists in the United States as stated in the FCC rules is, "Recognition and enhancement of the value of the amateur service to the public as a voluntary noncommercial communication service, particularly with respect to providing emergency communications." (CFR 47, part 97.1(a)) Interested in providing emergency communications? There will be an AUXCOMM course coming this November 5 & 6, held in Helena. This course is open to all hams who have completed the FEMA ICS courses IS-100, IS-200, IS-700, and IS-800. The focus of this two-day class is working in an incident communications environment, under ICS. The class is limited to 30 participants. • Location: Fort Harrison, Regional Training Institute (RTI), Helena MT • Times: Class will start at 0800 Saturday and 0700 Sunday. (The earlier start on Sunday is to let those who have a long drive home get an earlier start.) These will be full days; the course is nominally 20 hours long. • There is no charge for this course; however you are responsible for your travel / housing / food. o You are on your own for lunch; lunches are NOT being provided. Plan to eat lunch at the training site. • Each student must have a public safety organization affiliation. Unless you have an established affiliation with a public safety organization (e.g., city police department), we will use each county's Sheriff. Therefore I need to know your county. o The use of the Sheriff was decided by Tom Munsey, the state Emergency Preparedness Manager. According to Tom, the Sheriff does not need to be contacted about this. o NOTE: volunteer organizations like ARES, RACES, REACT, etc. do NOT qualify as a public safety organization. • Course materials will be distributed electronically the week before the class. You are expected to bring a device, e.g., laptop, tablet, with those materials loaded to follow the presentations. (Remember your charger!) Also of course, something to take notes on. • Course etiquette: do not bring radios, club jackets, hats, etc. Leave all that home or in your vehicle. To register for the course, I need to receive from you BY OCTOBER 19: 1. PDFs of your completion certificates for FEMA ICS courses IS-100, IS-200, IS-700, and IS-800. 2. A PDF of your amateur license; the Reference copy is OK. 3. Your County 4. Your name as you wish it to appear on your completion certificate. 5. Your work (if any) and cell phone number. When I have received all of this information, I will notify you that you are registered.”

Get off my lawn! ?

I don’t want to burn you at the stake, I promise! Amateur radio needs people who have your experience and knowledge. I understand your concerns, but I’m seeing ham radio differently. I’m a member of a couple groups for homemade antenna building, a couple groups for digital HF modes like FT8, an antenna modeling group, and even a group dedicated to test equipment. I see nobody on any of those groups who self identified as a Baofeng waving question memorizer, but I would not be surprised if some started there and grew into more technically interested hams. I’m excited also about how we make use of GMRS, because that’s also very useful. I think that a person’s perspective really depends on their surroundings and it sounds like you’re not enjoying the same surroundings as I am.

You’re running out of memory. That’s why cron says it can’t fork. One or more of the calls allocates memory but never releases it. Added: https://stackoverflow.com/questions/37353725/cron-error-cant-fork

You’re right; I didn’t use the Gordon West books. I’ve never even handled one. But I did use the HamStudy website and app which were very effective for me. Because of my background I could understand most of the answers. The flash cards have links leading to background information that helped me understand those that I didn’t understand intuitively. I studied to understand, not memorize. I’m a VE now and I see some of the new people coming in. I’m sure there are some who try to just memorize the technician pool, but there are also those who seek to learn. Getting their Technician license gets them started along that path and helps foster further learning rather than memorization.

https://www.foxnews.com/lifestyle/hurricane-ian-hero-maryland-firefighter-ham-radio-send-rescuers-sanibel-island?fbclid=IwAR35WWKuHE6EW8Drf3uoqD5VumVA_mR8GDzdA5pjz29rzopSBJEknpsA8qQ I cannot answer that, but based on the examples above at least some did.

Many repeaters use the same tone for TX and RX, so if you scan for tone on the repeater frequency you can at least try that tone for the TX as well. If that doesn’t work try several tones above and below the RX tone. They’re usually not too far off.

Bullshit. That’s a cheap shot that paints all of us with the same brush. Yes, there are those that simply memorize enough to pass the Technicians test, but they don’t hang around long. There are still many who work within clubs to help provide backup long distance communications. There are hams helping out during every tornado, flood, and hurricane.

I completely agree with this. Plus maybe it would be good to allow users to mark a site as “non-responsive” if they don’t respond to requests.

Unfortunately, our repeater guy hasn’t been given a key to the new gate lock. So, we had to walk up the last 1,300 feet (vertical feet, many more than that horizontally through numerous switchbacks over lose shale). Here’s what it looks like from where we parked looking up at the tower. The smudge on top of that rocky bump is it. I won’t need to take a stress test.

No, the 2900R had 75 watts; the 2980 increased the output to 80 w.

So today I accompanied the young man who maintains our amateur radio repeater. Our repeater is at about 9700 feet MSL, which is about 4,000 above where I live. Our repeater has an amazing coverage on 2 meter, reaching nearly a hundred miles in some directions, despite being situated in a mountain range. Our repeater uses a collinear array of four folded dipoles. Because they are a phased array the coverage pattern can be electronically modified wider coverage or to tilt the pattern by adjusting the phasing harness, but of course wider coverage comes at the cost of lower gain; which is why the Comet has higher gain. Here is a picture of the tower with our antenna being the highest 4x folded dipole array and a picture of the view towards Butte from the lookout.

That seems like a very reasonable course of action. Please be sure and let us know how you like it.

Requiring a tone for the receiver of a repeater is normal to limit what gets re-transmitted. Having no tone on the repeater transmit side is simply a choice.

So here are some things to consider. For many of us this is a hobby. For others it's a livelihood or a quest for the technically perfect. The Commscope DB404-B is probably a helluva antenna. It's certainly built like a tank and it looks cool; folded dipoles do. Also, according to the Commscope site it has a gain of 5.9 dBi. That's certainly not bad. JB007 is probably right in comparing it to a Lamborghini. Solid Signal has them for a little more than $426. https://www.commscope.com/product-type/antennas/base-station-antennas-equipment/base-station-antennas/itemdb404-b/ The Comet is not as unique looking. It's not sold as an amateur radio antenna. Comet does market it as a Commercial antenna. Of course anyone can say nearly anything, but remember what Ed Fong said about his confidence in their published characteristics. It has a gain of 9 dBi, which is 3.1dB better than the DB404-B. Yes, LMR 400 has higher loss than hardline. Nobody would dispute that. Your antenna is probably at the end of a 50' cable, possibly 75'. The loss for LMR400 is 2.7dB at 100 feet at 450 MHz. Hardline has losses of 1.63 dB per 100 ft for the half inch diameter, 1.12 dB for 3/4 inch cable, so for a 50 foot cable the difference is 1.1 dB. For longer distances it starts to add up, but if you're using only 50 feet you probably cannot tell the difference. Plus, the LMR 400 is already paid for. So, with a 50 foot drop, the combination of the $140 Comet antenna and LMR 400 cable that you already have still works out as 2 dB better than the Commscope antenna plus hardline. It might not be quite as durable, but the Comet is rated for up to 112 mph winds. It sounds like you're just trying to get a little bit more range from your base station. None of us can make your decision for you. A professional facility that must have 100% reliability would almost certainly go for the Commscope and hardline and I completely agree that would make sense. But they would also probably use a Motorola radio and have a very complete ground system and lightning protection as well as a tower set in a block of concrete. I guess the point I would make is simply that a person can spend a lot of money while only making incremental improvements that are not proportional to the cost. Best is the enemy of good enough. As far as the Comet antenna, other people have spoken highly of it on this forum as well:

There are a few pretty neat mobile ham radios that can be configured as cross-band repeaters without needing two separate radios. The Yaesu FTM-6000 is an example at a price of $270. It has two separate VFOs. If you want digital modes there are models from Alinco, Anytone, and Yaesu that do that as well.

The reason I looked at Comet was because I followed a rabbit trail that started here. I read some posts here from some highly respected people like Marc Spaz that gave high marks to the Comet CX-333 tri-band antenna. So then I searched for a review of the antenna and found a comparison test of the Ed Fong antenna to the cx-333. The Comet did a couple dB better, which is significant. Then the guy who did the tests contacted Ed Fong to get his comments. Mr. Fong spoke very highly of the Comet antenna and also of the Comet company and how accurately they advertise their products.

It really does depend how you learn best. There’s not very many books on GMRS, like a “For Dummies” book, but many of the concepts will be very similar in ham radio and there are a buttload of books for that. I suggest visiting the public library. Another thing would be to see if there’s a local to you radio club, either GMRS or ham radio (many of us enjoy both.) And of course don’t hesitate to ask questions here.

I can’t answer your question, but what about something like this: https://www.dxengineering.com/parts/cma-ca-712efc

In this case Alex is right. The owner of this site probably doesn’t want to have a thread that teaches people to flagrantly disregard regulations. Now if you wanted to publish almost exactly the same thread in the ham radio area and aim it at doing a cross-band VHF/UHF repeater, nobody could complain.