Mobile antenna tuning/ RF ground basics
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- Опубликовано: 5 окт 2018
- In Texas we callem SWR's although it Is a ratio and is not plural ... Lol..
An swr analyzer is always best but if you do not have one you can use your radio to sweep the frequencies. Make sure you you a low power setting when using your radio to sweep frequencies ... www.442built.com for sales, service , and quotes use the contact tab to email ,call or text.
All sales are final on export radios, Export radios are factory repair or exchange only. 
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RIP Smokin Joe and thank you for posting this video. I finally grounded my Predator 10 k the correct way and finally got 1.1 march because of your easy instructions on rf ground. You are truly missed in the CB community
05:35 not 100% true.. the actual wire you use from antenna to the chassis will KINDA act as a radial..KINDA, and its short depending how long a wire you use.... but the actual connecting the wire to the chassis is pointless! lol.. GOOD VIDEO well said! 40+ years experiance here and agree with you 100%
I love that old school ink pin! I just subscribed! Thanks!
Moder trucks have so much rubber mounts for the panels and cab, run low ohm grounding straps from frame to each panel. This gives all the panels a good dc ground, for a good ground plane.
I see this problem on newer dump trucks. The mirror mounts, the mirror arms are made out of mostly plastic. When they hard mount a antenna ( example sirio antennae) with a high power ranger,N2,N4 or 63ffb4 the SWR is waaay too high. Requires a good grounding strap or heavy 6 gauge wire mounted to antennae and truck frame or firewall.
Did you ever puck your antenna? If so, what puck did you use?!
Thanks in advance!
I just bought a 2011 Ford Escape XLT, and I'm wanting to run a Wilson 1000 magnet mount, but the best area (middle of the roof) is fiberglass. Any suggestions??? at some point I will also be using a Predator 10k. Tnx for any tips 73's de Delta Tango 216 the "radio bandit" :)
Trouble finding an rf ground on my Rv fiberglass roof. Used a baking tin and mag lil will for my 2970n4. Guess a really long wire for rf ground to a metal frame stud or roof joist?
beautiful information thanks for your time in explaining this for me and my CB friends. I could not explain the MFJ analyzer and resonance.
and loss of power?
thans
What if your bed is grounded to the chassis and your antenna is grounded to the bed is that sufficient?
The cab of the truck and all body panels should have continuity with the antenna mount for proper RF grounding
dc continuity or rf continuity ?
@@andhanwer neither. Rf or DC...Continuity means an uninterrupted connection.
lol but obviously they aren't so are you recanting everything you said in the video about rf ground?
you can't have it both ways, you know.
even if there's more than one of you
@@andhanwer not recantung anything Radio frequency ground has nothing to do with direct current.. continuity is a solid or unbroken connection... I'm sorry it is so confusing for you . It's really simple
Hello Smoking Joe, Please help, I have a RCI 2950 and when I turn on the device in RX and TX is one channel lower until it warms up a bit, then I lightly hit it on the lid Please help, I have a RCI 2950 and when I turn on the device in RX and TX i have one channel lower until it warms up a bit, when it warms up a little then I gently knock on the housing of the station and then it comes to the channel it needs otherwise it is always 1 down
Please if you can help what should I replace
73... 9A3DZL, 328lr021 Nebojša
Awesome production. Thanks for the info. I always believed the grounding to the frame myth.
What is reflection?
Thank you
Love to know what you have done for ground plane on the new cascadias..My swr is below 1.3 across the board..My r is between 46 and 52 and my lowest x is 6..I have to go lower to about 26600 to get a 0 resonance but my rec is low..Running a 7ft skip shooter on a mirror arm mount..lmr 240 with amphanol ends(soldered)..For shits n giggles i tried with a single coil 10k on a 22" shaft and not as good rec but almost exact same #'s..Only have 1 braided strap on my door hinge but multi meter shows almost noo resistance at all..less than 1 ohm..Useing a procomm mirror arm mount for the 19 cascadia..Im thinkin the prob is the mount..Your thoughts?
is it angled forward about 45degrees.
But there is usually continuity between the frame and the body of the truck anyway right ? So what's the diff between bolting to the body of the truck or the frame?
Surface area. Counterpoise. Your frame will never be sufficient counterpoise
I think you got your info mixed up at one point 9:07 but you know what's correct but you might have confused a few viewers. I know it's tough to make sure everything comes out right while making a video but you might need to scrutinise your commentary before you publish the video or add a correction. But you do help some operators and thats a positive result. Good job.
I have a question for you. I get a 1.0 to 1.2 across 40 ch. with firestick on 2015 389 pete mirror bars. 1.0 on ch 15- 25. Great match. When I try to install a wilson 2000 on it jumps from 5-7 on swr. Same mount, same location. The same on several locations on the mirror bars. Thats a wilson straight from new package. Tried 5” and 10” shaft. It will not adjust lower than 5.0 on swr. Using radio meter and dosy base station meter. The same. Any ideas on what it could be? Or does my anytone at-6666 just does not like a good antenna?
Sounds like something is faulty with your antenna
I will return it and try again. Thanks for the videos
Ok. I got this wilson figured out. Directions on package state 49.25 inch of whip for 27.205. Then fine tune from there. I installed antenna and bottomed out whip. Like i have always done wilson antennas. This give me 5.5 on ch 1, 7 on ch 40. I was flipping through freq. seen swr was close on 25..... That tells me its wrong length for freq. I started clipping 1 inch at a time until I got it 1.3 on ch 1, 1.3 on ch 40. And 1.2 on all other ch in between. 8 inches removed from factory whip that came in package. Last inch I took off so I could adjust in slider for fine tune. I have never seen this much clipping on a wilson. But matched now and tested. All good to go. Unsure if you have ran in to this with wilsons.
Thanks for the video. Got my situation in control from viewing this video
So, I have a CB in my Chevy. The antenna is mounted to the face of the toolbox towards the tailgate and I have a 12Ga wire to the frame because that's what I was told to do. When I connect my SWR meter, my readings are CH1-1.1, CH40-3+. The radio's meter reads the same. When I take the external meter out of line, the radio reads CH1-1.5 Ch19-1.0 Ch40-1.4. Only reason I could think of is that the cable is radiating RF and adding the meter obviously changes the "effective" antenna length. Am I fine or do I have a problem? Should I reground the antenna to the bed and tie the bed and cab together?
BTW, this video was quite helpful. Thanks.
Unground from the frame and run ground to your bed and cab body. Reset your antenna you should fall flat and won't have the other issues
@@smokinjoeselectronics442bu7 thanks I'll try that
I got a galaxy 98vhp . Running a through roof Wilson 1000. One i turn up the dead key past 30 watts my swr goes for 1.2. To like 1.7. For kicks I hooked up one of my HF rigs and transmitted 100 watt cw carrier perfect 1.1 1.2 swr. What could be the issue with the galaxy
The Galaxy is miss aligned. It is producing harmonic content and IMD which means it's transmitting on frequencies other than the channel your on out side of the CB band. Your antenna is not tuned for those frequencies so the power gets reflected back into your radio . If you wish to send it in for service go to www.442built.com and use the contact tab.
Cobra 25 Ltd classic, radio is wired to the battery and grounded to the ground on the body attached to the battery. Antenna is mounted inside an aluminum part of my bed. I have proper continuity in the coax. SWR is above 3 on 1 and 40. Nothing I try brings it down, plz help anyone. I’ve tried grounding the mount to frame and body, no difference.
Try a different antenna. Hopefully you have solved your problem! 😀
If you got good rf ground..
If swr is low on lower channels and high on higher channels, shorten the antenna.
If swr is high on lower channels but low on higher channels, what do you do?
If your swr is lower on a higher channel that your trying to tune on then you will need to lengthen your antenna
@@smokinjoeselectronics442bu7 thank you. I appreciate your work.
Great video, well explained
Getting both 10m/CB and VHF/UHF (144/444) units installed next week, at local CB shop, only one in the entire region, and they seem unsure about the HAM unit, being unable to tune without as they say “we don’t have equipment to tune at vhf/uhf frequencies” - They typically only deal with CB/10 m. To verify their install (2units, 2 antenna) do I need a tuner, or just a wattmeter as shown in video? The intended antenna is a 2m/70cm by design. I’m new to all this and no ham shops of any kind within 300 miles.
👍📻💨💨💨💨💨💨
What about grounding all the body panels?
Yes the more the better
What's the best channel to tune to?
The one you use.
My mind is blown
Inevitably wont you have dc ground in the body panels. Not all mount points are isolated in all vehicles
You don't need isolation . Only sufficient surface area for proper counterpoise
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WOW I am no electrical whiz but I learned something today I didnt know 40 years ago.
. . . waiting for Hughesnet to buffer . . .
Can I send one of my big radios to you to check out
Send it on down .. www.442built.com feel free to email call or text
What if the body is aluminum...How do you RF ground on aluminum body vehicle?
Aluminium is is more condutive then steel
Thanks. I got it.
Good education
excellent
Oh no kidding
Greetings from Western Canada! You must be telling the truth because you're left handed lol. (One lefty to another.) I've just ordered my first brand new CB radio since my first one back in 1976 when I was just 17 years old! I'll be installing a President Mckinley 40ch. Sideband with a 5ft. Fire Stik and 9ft. coax from the front left hood rail on our Town & Country Mini Van! I haven't informed my wife of my executive decision yet! I hope she's out shopping when my package comes in the mail this Friday July 17th, 2020 ha! Then when it's late and she's sound asleep, I'll do a quick install! Hopefully she'll never notice anything out of the ordinary! 🤯 The only ones that know of my plan are our three small grandchildren! 😅🤣😂😭 Mercy' Lamplighter XM12-31113 on the side wall to wall tree top tall - over, back to you! Thanks for your valuable information!!! 👍😎
Awesome info!
I'd make sure you didn't go out and buy some cheap coax. Your signal "sees" the metal of the vehicle through the "cheap" coax and it's reflected back, causing bad SWR readings. Buy the best coax you can buy, no matter what you are using it for.