WRYT685
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Posts posted by WRYT685
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Any clue what would cause one channel (15 here) to sound like an old Peterbilt at high idle? Its pretty regular, and screws with my scan mojo...
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Going to my first Anime/Scifi/fanfest this weekend with my adult daughter. She's big into them, makes costumes and everything.
What should I expect?
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17 minutes ago, WRQC527 said:
If you haven't done so already, and if you haven't already thrown it away, cut the old coax into a bunch of useless pieces so you will never be tempted to "save it for some other project down the line" and five years later forget why you replaced it in the first place.
It's already round filed.
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12 hours ago, marcspaz said:
This isn't a problem in the 400-500 MHz range. Both Randy and I have shared test results for this. Unless you plan on winding the coax to less than an inch in diameter while using some super cheap (unshielded) coax, it won't matter.
Now, when you start getting down to 50 MHz to about 21 MHz, 8 inch to 25 inch coiled coax just spooled up and tossed aside becomes an issue with SWR. That's why when we do CB installations, we use either a 9 foot or 18 foot cable and just snake the extra cable around the interior, trying to avoid half or full loops in the cable. The lengths are balanced 1/4 or 1/2 wave.
Not planning on doing any super tight winds; I just spent two hours writing up a Quality Assurance report to Engineering on a landing gear harness with excessive bend radius. As anal as we have to get with the fiddly bits on jets, I see no reason to not take the same precautions on my rig...and we run loads of coax in stacked runs.
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On 9/24/2023 at 8:37 PM, WRQC527 said:
The more I hear, the more it sounds like your coax is somehow jacked up and your antenna is now possibly too short. Antennas that are slightly too short or too long, (which is unlikely with an out-of-the-box MXTA26), shouldn't generate a 10:1 SWR reading. Bad coax, bad grounds, even one tiny wire from the braid or center conductor shorting out at the connector will jack up your SWR that much. If you can take the coax completely out so it is not connected to anything, there should be no continuity between the center pin and the outer shell of the connector on either end of the coax. It should be an open circuit.
You're probably right. Just for the Halibut, I clipped off the crimp connector and used a solder connector...SWR got better by half, but were still 5+, so that coax is getting round filed this weekend. I have a new Midland NMO mount and coax that I'll be putting on, along with a new antenna.
Now, for the eternal debate...should I or shouldn't I shorten the coax vs. looping the excess in the engine bay? (not enough room behind the dash/console for a 12" loop)
*fight's on*
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On 9/17/2023 at 10:58 AM, WRYS438 said:
Greetings my friend. Just a follow up on the #42 you gave me last night. I managed to get out to the car in the rain and enter that tone. Works 100%.
I still do not know how you came up with #42, but I'm so happy you knew how to do it. There are two more repeaters in this area that I hope to gain entry
to in the near future. No idea what the tones are for those but I will soon. Maybe my light will come on and I will be able to understand where you found
tone #42 for the 311 I had.
Thanks again, you made my day. Enjoy your Sunday.
George
If you google "MXT275 Owner's Manual" you'll pull up links to the .pdf document Midland puts out. The last few pages are charts that show Channel freq, and tone codes for Ct and DC modes. I had to download it, too, the manual that came with the radio didn't have those pages.
Or, you can grab it here, since I just saw the upload tab...
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On 9/5/2023 at 8:48 PM, WRKC935 said:
And that was my whole point. Thing is that the South Korea and China saw no damage either. And I was at a loss to find any information on damage done in the US from tests when they were conducted, which was the point of what I said.
EMP is a real thing, and I am not trying to minimize the effects of it when it comes to things like the electrical grid.
But to hear some people talk about an EMP is that anyone with ear rings in will be electrocuted by the voltage induced between them across your head. We had cars with computers in the 90's. No one seemed to be effected by the EMP from any of the testing in that era. Sure those detonations were below ground. But if the EMP is that powerful to effect every car in the midwest from a high altitude air burst then how is it that no one was effected at all during any of the testing. Or were those effects just not documented? I don't know.
I think your forgetting one important factor: they were all BELOW GROUND. The EM burst was strongly attenuated and dissipated by, well, the ground. That was by design...the NORK government doesn't go out of it's way to piss off it's sole sponsor, the PRC. Our government learned from Starfish, and applied those lessons to future testing.
Exoatmospheric detonations won't be so attenuated, at least for some distance.
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2 hours ago, wayoverthere said:
Loop testing is great to test no breaks in either conductor in one shot, but it's not a great check to make sure the center and braid aren't shorting together.
Did OP by chance shorten the cable and crimp on a new connector?Checking for shorts is the first thing I did. Yes, I shortened the cable and crimped on a new one.
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2 hours ago, WRQC527 said:
Not sure why "good continuity" is a good thing between the center pin and the outer shell of the connector. Scrap the coax. Start over. Don't cut the antenna. Hopefully you haven’t cut to much of it already.
I was loop testing to make sure both the center conductor and the braided shielding weren't broken. It's a common technique in Aviation to jumper a pair of wires/conductors to verify continuity.
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More data: pulled antenna and checked for shorts at both ends, because OCD. No shorts. Installed a jumper between center pin and outer connector, got good continuity at the NMO pad end, switched ends, same-same. Resistance measured out 0.9 on 200 Ohm setting.
For giggles, I broke out the teeny mag mount antenna and put it on the meter: 1.0 sitting next to the old mount on my hood.
*throws papers in the air*
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So, I'm setting up my in cab rig for my offroader, MXT275, MXTA26, hood mount for the whip. It SWRs out to 2.96. Pulled the whip up as far as I can, 2.46. Okay, can't add more metal, so did some digging, seems a lot of folks trim it down quite a bit to bring it in...trimmed off a smidgen, 2.35, okay, right direction. A little bit more...WHOA NELLY! 10.7!!!! Put my stubby on, which had measured at 1.0 earlier, and it was 10.6...did I cook my coax with a measly 15 watts?
GMRS and Amateur Radio for emergencies... Have you done it?
in General Discussion
Posted
I've used CB for emergencies, but in light of the recent AT&T shutdown, I'm picking up a couple more GMRS/FRS HHs for my spouse and adult kids to use for emergency comms if something similar happens to our provider/s. We fortunately live close enough we will be able to communicate on the FRS channels between our houses.