SteveShannon

Very good point! If the voltage sags when transmitting, that could explain it.

Did you look at the notarubicon video of the same unit? I think he tested it for power output (I could be wrong). @OffRoaderXtracks that YouTube channel pretty closely ?. Maybe he can comment.

I agree, seems disappointing.

Very well said. This hits the nail on the head. A lot of people believe that unless a receiver is superheterodyne it suffers, but it’s simply not necessarily true. DSPs and integrated circuit design has blown past traditional circuits. The flexibility that can be achieved with a direct conversion Software Defined Radio is just incredible and only going to get better. As an example here’s a link to a solicitation from four years ago for radio equipment: https://www.sbir.gov/node/1482371 Of course as your so correctly pointed out they can be done poorly also, but the over simplistic notion that superheat > all other technologies is incorrect. And this also explains why a number of companies can start with a reference design created by a SDR chip maker and tweak and tune it to come up with something that’s outstanding. It doesn’t make sense to go all the way back to a blank piece of paper. Want a dual band 2 meter/70 cm radio? All you need is different firmware. Want a really high quality commercial radio? Add some front end improvements, higher quality case, better parts, and firmware, but the core design doesn’t have to be thrown away. That’s where a very agile company can turn out numerous designs for different markets all over the world. And that’s why it’s silly to discount anything that didn’t start out on a blank piece of paper and only designed for the GMRS market.

What was the SWR at each of those frequencies and settings?

Thanks for the shout out. I’ll try not to be too slow in the future! ? Sounds like it worked out. I might have just taken it the wrong direction.

I'm probably being pedantic, but detachable antennas are prohibited on GMRS radios when those radios are capable of sending digital data. https://www.ecfr.gov/current/title-47/section-95.1787

Not that I know of here in Montana. Our WHOLE state is also a single area code (406), but I have to wonder if adopting a standard based on sparsely populated states with single area codes creates more problems than it solves. It's probably fine for people who primarily recreate in that state, especially hikers, fishers, etc., but for people passing through using the interstate system it isn't obvious, unless the state starts erecting billboards notifying people. Maybe interstates are not considered because cell coverage follows them.

Just so you know, you can edit a post or comment that you made by clicking on the three little dots in the upper right corner of the post or comment.

Probably not. While there are a limited number of hardware com ports, Windows can continue creating virtual com ports and assign them to USB ports. What did you learn in Device Manager?

Unfortunately, I don’t remember the exact sequence I had to do to use a non-FTDI cable with Chirp for a radio, but I made it work by opening Device Manager and looking for any exclamation marks which indicate a device that needs attention. My devices were okay, so the next thing I did was expand the USB ports, and then enabling a com port there under one of the USB ports. Once I did that, when I clicked on the list of com ports included the one I needed. You only have to do the Device Manager thing once each new device. The new device is the USB cable in this case. So, to recap, open Device Manager and look for an exclamation mark showing that you have a driver problem. If you do, resolve the problem. That may mean unplugging the USB cable, rebooting the computer, and loading software before plugging in the cable. You cannot make changes in Device Manager unless you’re logged in as the administrator account. Then, once the device has been recognized you may need to tell Windows to allow a com port to be assigned to the USB device. I’ve never needed to keep an older computer for driver compatibility. Windows 10 has the ability to right click and run programs in compatibility mode where you choose the software level (at least back to Win 8 or possibly even 7. I’ve only had to do that once, but it was helpful. When you’re in Device Manager, if it seems too daunting, take screen shots and I may be able to make suggestions.

I greatly enjoyed reading this post and I love hearing about your military experiences. But I have to agree with OffroadX that people are responsible for their own actions, especially when it comes to emulating someone on the internet. There are far more authoritative warnings against transmitting into an infinite impedance than the examples his two videos show.

The fact is that nearly all radios specifically manufactured for GMRS are made in China. I would say all, but a person doesn’t have to look far to see examples of people who use such absolute terms ?. If a person wants to buy a new GMRS radio with a factory warranty and appropriate regulatory compliance, they will most likely be buying a radio that was manufactured in China. Now I need to look and see where my Garmin was made.

An automotive store near you may have the connectors to match with the ends on the cigarette lighter plug you bought. They’re a friction fit. Or, just a little lower on the Amazon page you referenced was a similar power plug that came with the matching crimp connectors: https://www.amazon.com/Pack-Fused-Replacement-Cigarette-Lighter/dp/B097HV2G6T/ref=pd_sbs_2/132-2187296-8026262?pd_rd_w=JsZGS&pf_rd_p=23e9c531-a4f3-4198-b456-2bff73f4055a&pf_rd_r=N3WY1JRK24AQBSRVAVKM&pd_rd_r=6af19e81-d41b-4444-ad85-7bd9ad854f76&pd_rd_wg=vnbyX&pd_rd_i=B097HV2G6T&psc=1 Of course you would need a crimper.

Cheap Chinese Radios.

Thanks! Looking at the page for it on Amazon, it appeared to be an amateur radio, but reading the reviews make it clear that it's GMRS. https://www.amazon.com/AnyTone-Mobile-AT-779UV-Transceiver-Scanning-Receiver/dp/B08PF9QTLH

The upper end of coverage on the UHF band for the AT-779UV is 450 MHz, which is too low for use on the GMRS band. Some radios can be hacked to allow greater coverage. That's technically against the rules/regulations of the FCC, but you can easily find references to a lot of people who do it. GMRS channels are centered around 462 and 467 MHz. Edit: After staring at the description of this radio longer, I'm not sure whether it's a dual band amateur radio that can be opened up to be a GMRS transciever or a GMRS transciever that can be opened up to operate as a ham radio.

Even moisture in the air causes attenuation of UHF signals.

I agree. That is more accurate. It’s almost certain that the repeater has a higher and better antenna and possibly even a better receiver, but it’s much easier to physically find the repeater, which has a chance of eventually putting you within range of someone who is transmitting, than it is to find *someone who is transmitting* without approaching the repeater. Gotta start somewhere.

Probably a silly question, but is the repeater transmitting in narrowband? That will make the audio much lower.

Don’t feel bad. Lots of people like to do a data dump when asked a question (myself included!) Let me see if I can avoid over complicating it. I’m only going to concentrate on CTCSS tones. These tones just work as a way to avoid audibly hearing (in the case of a simple radio user) or retransmitting (in the case of a repeater) a received signal. If you transmit with a tone of 87.5 Hz, that tone is added to your audio. If I set my receive tone to 87.5 Hz, my receiver will allow your audio to be reproduced by my speaker, after filtering out the low frequency 87.5 Hz tone. My receiver receives other transmissions but doesn’t audibly reproduce them unless they contain the correct tone. If I want to hear everything I just remove the receive tones and it’ll audibly reproduce everything. Similarly repeater owners program their repeaters to listen for one specific tone. That’s the uplink tone, “up” meaning transmissions to the repeater, “down” meaning transmissions from the repeater to others. Any transmissions on the same uplink channel which don’t include that specific tone will be ignored and not retransmitted by the repeater. The repeater operator can limit who knows what the uplink tone is in order to reduce what the repeater retransmits. That’s about the only access control a repeater operator has in GMRS. Many repeaters also use a downlink tone. That is simply to provide a convenient way for people to hear the repeater transmissions without hearing other transmissions on that channel. There could be casual users who are simply using the same channel as the repeater transmits upon. Repeater users may not want to hear their chatter. In most cases the repeater operator uses the same downlink tone as the uplink tone. When someone chooses a different receive tone than the tone used for transmit, that’s called a split tone. Honestly, I’m not convinced it accomplishes much. It really doesn’t limit who can use a repeater as others have claimed, because a person can simply clear out the CTCSS receive tone and hear everything that’s transmitted. The only legal way to limit who can use a GMRS repeater is to try and keep people from learning the uplink tone. Because there’s a limited number of tones and because they can can be guessed or easily scanned if you’re near the repeater, that’s only a temporary limitation.

I’ve tested it and it seems like it works. A friend got a Wouxun KG-805G and it doesn’t appear to have the ability to scan for CTCSS. Someday I’d love to try one of those Motorola radios some of you have, but for now I’m pretty happy with my Garmin Rino.

Divide watts by volts to get amps. An advertisement for the Jackery 240 mentions 14.4 volts, so divide 130 watts by 14.4 volts and you get a little more than 9 amps.

A person could probably make something using one of the wideband SDR receivers, which are not filtered to remove sub tones. A software filter to remove everything above 300 Hz would allow you to see just the sub tone, which could even be fed into a multimeter with a frequency setting. Of course a cheap uv5r has the ability to scan for privacy tones so maybe that’s the easiest.

I’ve read that the audio coming out of a radio that’s designed for tones has already had the low frequency tones filtered out so that probably wouldn’t work. Here’s the article on Wikipedia: https://en.m.wikipedia.org/wiki/Continuous_Tone-Coded_Squelch_System It says: “In a communications receiver designed for CTCSS, a high-pass audio filter is supposed to block CTCSS tones (below 300 Hz) so they are not heard in the speaker. Since audio curves vary from one receiver to another, some radios may pass an audible level of the CTCSS tone to the speaker.”