axorlov

Radio in video also could be R-187-N1 (or -P1), another russian encrypted FHSS radio with analog FM, AM and TETRA. They are compatible with earlier mentioned R-168-UM, but are newer. https://reibert.info/lots/radiostancija-azart-r-187-p1.946513/ Radio in this ad is with extended battery, the short batteries do exists. This ukrainian review mentions good sensitivity and great selectivity "much better than Baofeng": https://armyinform.com.ua/2022/11/20/trofejna-radiostancziya-azart/ Great tear-down pics, don't miss. Ukrainians also managed to crack or steal master password that works on any R-187-N1, apparently. The quality of the video is poor, so hard to tell. But I don't think it makes sense to pick up a Baofeng or Motorola. On the other hand, encrypted FHSS radio with actual programming from the enemy will allow better tactical awareness for the ukranian units in the area.

Could be R-168 too. It is part of encrypted "Aquaduct" system, and in this case picking it might worth the trouble. Here is ad for sale with pictures, ad says that this radio was captured in Donetsk region and has a very secure password: 0000 https://reibert.info/lots/radiostancija-r-168-0-5um-akveduk-spec-svjaz.956129/

Jesus Chrysler! It was here all along. Thanks! I need better glass-wiping tissue. And no, you don't need to model metal parts, I suspect they will not change the picture in a single tiny bit.

Would be interesting to see elevation chart of half-wave (yes, half-wave) over real ground at 1.5m, like when it's installed on jeep tailgate or on small car with plastic roof, or being clipped to backpack on a shoulder height.

I have three TK-880H-1 in cars and at home. It is 40W version with Part 95 certification. They're used to be cheaper than dirt circa 2015, when law enforcement around the country was moving to P25, dumping perfectly good radios. Now they are between $100 and $200 on ebay, depending on condition and accessories.

Anybody is allowed on GMRS. Even youtube influenzers are allowed, least hams. Anybody who has a new squeaky scratchy $35 bill in their pocket is allowed.

From personal experience, in forest 2m (and MURS) is much better than 70cm (and GMRS). It is so much better that the difference in power between GMRS and MURS (4W vs 2W) does not make for the difference in propagation. In rocky canyons and mountains GMRS will hold the small edge over MURS because of better reflection and other wave effects. I still use GMRS for camping trips for a simple reason: the 40W mobile radio in a car at a campsite overshoots both GMRS and MURS handhelds by a wide margin, and it also hears better than handheld because of better receiver and more efficient antenna. With operator at campsite (or simplex repeater) you greatly extend the range of your GMRS handhelds, which is not possible with MURS. Simplex repeaters appear to be forbidden, so I only deploy it (configured to not pollute air when not needed) when far away from civilization.

Correct. The listener (who said he hears on reverse) would need to tune his receiver to 467.625. GMRS gear does not have an option to momentarily swap repeater input and output, but ubiquitous UV-5R does, and a whole bunch of commercial and GMRS gear could be programmed to listen to 467.xxx0 MHz. Tones are not needed to hear everything. Tones are only needed to limit what you are hearing. It is also possible that the listener has a proper scanner up and running.

Ham repeater? It would mean the other person hears original correspondent well on repeater input, meaning that they are very close to each other. If they are only interested in talking to each other, they can go to simplex and do not tie up the repeater. Ham gear often has a button to receive the repeater input frequency on the programmed repeater channel. GMRS gear does not have this feature.

Hey Steve, someone who has grandkids has a valid excuse, haha! I will not hold it against you. Enjoy what you enjoy and let me despise what I can't stand. It's a free country.

Thanks for the answer, although two last paragraphs are way off the mark. But anyway, you answered.

My question is simple: Taking context in account (discussion about rules, and you citing silly song from a silly movie for silly girls), why you, or anybody who has no respect for rules, comment on discussion about the rules? If you do not care, why are you bothered that much to comment? I'm genuinely interested. I'm working on my PhD thesis on psychology.

I'm curious, why people who do not care, still come and comment here. Why? The people who had let it go already, why to to bother? What is that that deep under your conscience that makes you come and participate, WRTT642? This is a serious question.

Yes. And there are still some in Bay Area proper too, on low power. Sunol Ridge repeater W6SRR is actually heard well across the bay and in the Livermore-Amador valley, but it is quiet. Their 2m machine is very much active, 70cm is not so. Some years ago I used it to chat with my friends from Fremont and Livermore. It felt like a private intercom, no one ever joined. WW6BAY linked repeaters (BAY NET) are fairly active, but it's because their 70cm is liked to their 2m.

More like a tower Kama Sutra, with all the tiny details, positions, techniques and illustrations.

And where I am, you would not need P25 to keep it quiet. You just put it on air and it will stay quiet all by itself! In some areas 70cm mountain-top repeaters are shuttered by missile defense, the PAVE PAWS radars. This is the case in SF Bay Area, 70cm repeaters went quiet about 15 years ago. Not so in LA area, where are plenty of active 70cm repeaters.

I rarely hear anybody on the radio. It's because I use DCT! My reason for GMRS license was to have comms between family and friends when camping, hiking, kayaking etc. At the time I've got license my kids were pre-teens, and my wife had zero interest in getting ham license. We used GMRS actively over the years. My daughter is a ham too, but it is simpler for us to grab GMRS radios when we both out on MTB or on foot. Now when kids are adults and have their own interests, I mostly carry ham HT. And DCT or not, there is very little traffic on air in Sierra Nevada and in foothills. You will hear people around campgrounds and marinas, but wander a few miles up the trail and there is nothing.

Great to know!

I saw this. I interpret is as: if your radiator is frequency hopping or digitally modulated, then this section applies. Not correct, you think? There are other sections about 902-928MHz too.

Does the ISM operation in United States truly requires frequency hopping or similar spread spectrum modulation? Where is it stated? 15.247 describes conditions for the frequency hopping devices, but where it is written that analog FM on fixed frequency (say, with 12kHz channel width) is not allowed? Edit: I guess I found it: 15.247.a.2. Minimum bandwidth is 500kHz. Still can be used for DMR, etc. Does anybody have FCC ID for the RT10? Let's see the emission designation. Edit 2: Still can't find that analog FM (or AM) is explicitly prohibited. Also can't see where it is explicitly stated that only FHSS modes are allowed.

You are not missing anything about the actual physics. But perhaps some context might help. In good old days of radio people listened to signals (detected and demodulated CW) with ear, which is logarithmic in response. Meaning that we can clearly distinguish the difference in strength (amplitude) between two sounds if strengths (amplitude) is different about 4 times. If the difference in strength is less, they would sound about the same loud to us, humans. This is how RST-scale was invented in 1930s, and we are talking about S (strength) component here. S-scale is from 0 to 9 were one S unit is 6dB, i.e. 4x the strength, and zero S is calibrated to some value which I don't remember and I'm too lazy to look up. I think 50 microvolts (uV) at the antenna terminal, or maybe it's 5uV, it does not matter now really. So, if you hear the signal (say, detected and demodulated CW, like in good old times), then the difference in 3dB may not be even noticed. But in the same time, in fringe area, these 3dB may mean a difference between being barely heard and not being heard at all. So, your example about walking in the forest with the range of 1 mile and 1.21 miles (2x the power and 3dB difference) is perfectly valid. I had a spat before on this very forum about this very topic with a few respected members here, on the same very premise. And off tangent: I had a chance to read the full post of WROZ250, now deleted, and I don't think she attacked you. I interpreted it as a rant about people who have no clue (clearly not you), but built their youtube personalities on being dicks to others who actually have a clue or three about them.

Did it myself (the war driving) between 2000 and 2005 with Toshiba Libretto 100CT, and later with HP Jornada 720, both running linux with kismet. This reddit post is a blast from the past. Libretto is now in big trash can of history, but I still keep that Jornada, for I don't know what. Maybe because I contributed to jlime and openpsion projects.

Great post by Marc. But consider some practical applications. When you are in the forest (as opposed to an open range) the more power is always the answer. And we had our discussion about city, I don't want to delve into this now.

Tram Browning 6140 is a sweet antenna, but only covers GMRS and 70cm (UHF LMR in other words and 70cm ham). It is not designed for VHF, ham 2M or MURS or any other frequencies. I would totally recommend it for GMRS only (and ham 70cm). It's as fool proof as it gets, and fairly short. I used one for years.

Thin mobile antenna will be nearly invisible on the roof, but I would go with 1/2 wave, to not worry about ground plane. Something like Laird B4502 should do the job.