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Everything posted by SteveShannon
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Retevis RT97L portable repeater -- first impressions
SteveShannon replied to WRTC928's topic in Equipment Reviews
It seems I have a reputation to either change or uphold. Here are the ten paragraphs and big technical sounding words. Sorry. Lossy cable will always make your SWR appear artificially low when measured at the radio. If lossy cable is attenuating your forward power there will be less power that reaches the antenna and then whatever power is reflected by an imperfect impedance match is attenuated before if gets back to the radio. So an RF power meter/SWR meter placed at the radio will see erroneously low reflected power, resulting in an erroneous calculation of forward power and an erroneously low calculation of SWR. If your radio has an ALC circuit, it limits output power as SWR increases and allows greater power if the SWR appears low. Where are you measuring the power? At the radio or at the antenna? If you want an accurate reading of the SWR of the antenna, you must read at the antenna feed point. If you want to see how much power is reaching the antenna, measure it at the antenna feed point. If you want to see how much power your radio is emitting, measure at the radio. Sometimes it’s very helpful to measure power at both places at the same time to see the difference. How are you measuring it? Some RF power meters are simply better than others. Expensive ones are calibrated to a standard for a specific frequency and power range. Inexpensive ones may lose accuracy at different frequencies and power levels which can make things appear better or worse than they really are. Are all measurements at the same transmit frequency? Our radios often (always?) have a range of power output levels that change at different frequencies. -
Retevis RT97L portable repeater -- first impressions
SteveShannon replied to WRTC928's topic in Equipment Reviews
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It on your highest level profile, not the forum profile. Toggle the switch that says Weekly Repeater Digest:
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WOUXUN KG Q10H (unlocked) vs KG Q10G
SteveShannon replied to WSFU381's question in Technical Discussion
The difference between 4 watts and 5.5 watts is only discernible on a watt meter. It’ll make no difference to range. Just make sure you get the features that you want. -
@WSIK532 Channel 16 is the same receive frequency as RPT2. The difference is that the repeater input channel is 5.000 MHz higher. Without setting any receiver tones you’ll be able to hear the repeater but unless you have the transmit tone right they’ll never hear you.
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I don’t think people understand that the gps is just a receiver. Although it’s possible to see where a person has been if you have access to the phone’s data, the gps in your phone transmits nothing by itself. If you’re in airplane mode the phone does not “ping the towers” regardless of what ChatGPT says.
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That doesn’t mean that you can’t replace it yourself for just the price of the parts. See if the LED is getting voltage. It’s probably less than a volt to turn on and under 1.3 volts (dc) at max brightness. If it’s not getting voltage then it’s probably one of the chips upstream. Just trace them upstream. Or just start by changing the LED.
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But when even the people who have the copyright on the name Meshtastic say it’s a network, the lone person claiming everyone else is wrong, and that it’s not a network, might have a problem proving he’s right.
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What word follows “mesh” when talking about “mesh networks“?
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Travel Tones, PL/DPL differences
SteveShannon replied to wabutter's question in Technical Discussion
DN411 means the same as DPL411. -
Base Station 50w recommendations with USB-C charge
SteveShannon replied to bkmorse's topic in General Discussion
Personally I bought a Radioddity DB20G. It came with a cigarette lighter plug. I inserted Anderson PowerPoles into the power cord because I wanted them but in my pickup I simply use the cigarette lighter socket and plug. It’s a 20 watt radio but it does everything I need. It would make an ideal camp radio. -
I absolutely agree about double checking the legality. Internet has little to do with this though. The fcc simply included internet because it is an example of “any other network.” Originally the prohibition was against connecting to the phone network. “GMRS stations cannot be interconnected with the public switched telephone network or any other network for the purpose of carrying GMRS communications, but these networks can be used for remote control of repeater stations.”* *The above is the FCC’s interpretation, not the actual regulations @Blaise, arguing it’s a mesh, not a network, probably wouldn’t make a great first impression on the FCC. It’s funny though.
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Base Station 50w recommendations with USB-C charge
SteveShannon replied to bkmorse's topic in General Discussion
Look, connecting your radio to any 12 volt source is unlikely to damage the radio, but connecting a 50 watt radio to a source that can is fused for 10 amps might fry the fuse. Not all 50 watt radios require more than 10 amps. Some are more efficient than others and get by with about 9 amps, others use as much as 11 amps. As far as that “jump pack” I don’t know anything about it. -
It wouldn’t be user replaceable. It’s probably a surface mounted LED next to the edge of the LCD. And it might not have failed anyway. If possible return it for warranty service.
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The only person well enough known to be upvoted or downvoted just because of “who they are” is Randy, and for the most part I don’t think many (if any) people have downvoted him because of that. SoCalGMRS gets downvoted because of how he treats others, not because of who he is. If he stopped treating others that way the downvotes would quickly cease. It’s that simple.
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And certainly not in social media, the bastion of genteel behavior, patience, and selflessness.
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Just get a Cat 5 or Cat 6 extension cable: https://a.co/d/fJtoY4p
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And secret upvotes as well.
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I believe that would not be permitted by the FCC’s interpretation of the regulations.
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Base Station 50w recommendations with USB-C charge
SteveShannon replied to bkmorse's topic in General Discussion
That’s really an expensive, inefficient, and possibly inadequate solution. First, it’s fuse limited to 10 amps DC at 12 volts, so it possibly won’t work for some 50 watt radios. Of course you could use it to power your radio by plugging a switch mode power supply into the AC outlet but then you’re accepting the inefficiency of the inverter to produce 120 volts AC and also the inefficiency of the switch mode power supply. So you lose several percent of the energy in the battery. Just get a decent LiFePo4 battery and put it in a plastic ammo box. Or buy a ready made one that isn’t designed around a 10 amp fuse. -
So which was it, very manly or extremely manly?
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Read and write from/to CSV files, import frequencies from external sources such as Repeaterbook; copy, paste, channels like working in a spreadsheet. RT Systems does all that too. Also, save a file with the OEM software, then change the frequency ranges of the radio and try to write the software to the radio, even though the channels you’ve programmed are well within the range you chose. It won’t work. It will with RT Systems and I bet it will with Chirp. The OEM software is worse than simple; it’s bad.
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Showing respect for another person’s life is not weird. Now if you start fixating on it, that’s another story. One thing about the Anytone; if the call sign is just used for the splash screen that’s okay, but if you use the radio on DMR you’ll want/need to change the DMR ID to your own before transmitting.