kidphc
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Posts posted by kidphc
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Pretty much. Just different firmware.
The retagged anytone at-779 is the same radio with a different sticker. I have mine unlocked. (Softwares unlock and easy)
Anytone is version is usually cheaper. Most places sell it under $90 usd.
Both were tested by the same corporation in China and same person.
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A lot of ghost/stubby antennas are loaded coils. So efrectively more coil than antenna.With the ghost antenna being about 1/8 wavelength in length, I'm wondering what the engineering of the antenna is. Is there a coil inside? Is it classified as anything besides a "ghost antenna" (such as a "ground plane antenna")? It's a very unique design, and I would like to understand it better.
All the ones I were looking at where essential 5/8ths antennas and the gains would match with a standard 5/8 coil nmo antenna with appropriate matching assembly. Funny enough they are almost the same size. The ghost antennas were a tad shorter.
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I usually put the loop at the lowest point before entry into the house as a drip point. Outside that pretty well covered.What kind of feedline (RG-58?) do you have to the base station Ed Fong antenna and how long is it (guessing around 40 feet)? Receive will be sensitive to excessive feedline losses. It isn't a big deal at the lower frequencies of CB radio, but when you are operating at GMRS in the UHF spectrum losses build rapidly. Forty feet of RG-58 has 5.4dB of loss at 450MHz (more at 465MHz GMRS). Every 3dB of loss halves the power, 6dB halves that. So you'll end up at about 16.7W at the antenna using RG-58. Forty feet of LMR400 has 1.08dB of loss and with it you'll 30.6W out of your 40W.
In North CACKALACKY (my late wife and love of my life grew up in Havelock) you have humidity and storms. I would suggest N-type connectors and look up how to seal up the connections properly to keep moisture out of your feedlines. I use a connector silicone paste made to seal connections, it goes right in the connection. Then wrap the connection tightly with the silicone rubber "self-amalgamating" tape real good. Over that use the black vinyl electrical tape. And lastly, put a wire-tie (tie-strap) around the vinyl tape to keep it from unwinding on you. I use Times Microwave LMR-400 coax and it will cost you a "Ben Franklin" for 40 feet with N-type connectors. Don't forget a loop just at the antenna in the coax for strain relief (takes cable weight off of antenna connectors and puts it on your mast).
Shhhhhheeeewwww! Did I forget anything? Hope this helps.
Good catch I neglected feed line loss without some swr and power level readings it could be very well be part of the problem.
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I have an Ed Fong gmrs antenna up 25 ft on a pole and I live back in the woods. I understand that line of sight is the best way to receive and transmit, i can get about 3 miles from my base at home to my handhelds which is about all you can expect without a repeater. I plan to install one in the next month, my friend is about 2.5 miles away and he can receive me perfectly but i can't receive him on my base, but can on my handhelds. my question is can i do anything else to receive him better. i haven't seen anything that i can use to increase my receiving ability. If anyone has any suggestions, please let me know. I will be raising my antenna about another 15 to 20 feet soon, but these tall pines are still gonna block me out i think. Thanks for any input, Kevin WRZS512 Outer Banks, NC
Outside of clearing the trees.
You could try a quality yagi and rotator. You will be giving up omni directional gain for a concentrated beam gain. So much so it's often worth putting a yagi up with an omni directional antenna above it. 2x coax and a switch at the bottom in the shack. Unfortunately, not many remote switches for gmrs frequencies. The beam will also act as a groundplane for the omni when done right.
The pine trees will still hamper things.
Another thing to try is a pre-amp.
Not sure why you can get hin with your hand set but not the base. Should be the other way around. I mean you are on the ground with the hand sets. Something isn't right with your base by the sounds of it.
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To everyone that has pitched in with all the help, thank you! I am a newbie to anything but cb radio, old school.
Can I mount two different gmrs antennas on that same plate and switching out to radio as needed, being are both for the same frequency use?
Then mount a cb antenna on one side of the tailgate and a ham radio antenna to the other side to have all antennas/frequencies separated far enough anyway to alleviate or help with these issues?
It is really no different then cb. Just really the wavelengths. Hence why we jokingly call it uhf cb. Hopefully, it doesn't get as bad.
Yes you can mount two gmrs antennas on the same plane. I would recommend unplugging (antenna port on radio) / turning one off when the other is in use. Rf will still leak into the other radio's finals.
11m/cb is not a damaging harmonic (not even sure if it a harmonic, to lazy to check) of 2m/70/gmrs.
As long as the antennas aren't too close shouldn't be a problem.
My 11/10m antenna is on the rear hatch (driver side of hatch). The 2m/70cm on the hood and the gmrs on the center rear hatch about 3 ft from the cb antenna. Never had problems with it even when using 10m at 50w.
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Randy do you have a term for a salty GMRS user.?It means you were talking to a Sad-H.A.M. doing a poor job at disguising himself as a regular GMRS user. Next time ask him to reply using simple, plain, regular english that normal people understand.
Way too many coming out of the woodwork nowadays.
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I should add I have a ham radio with the antenna mounted almost in front of the driver on a hood hinge mount. The other antenna for gmrs is about 9" in front of the rear hatch on the roof. Roughly about 6 feet of separation and not even on the same plane.
Welp, I have blasted the ham radio with the gmrs radio and vice versa, remember 70cm is real close but far also from gmrs frequencies.
The Yaesu xtm400 (ham on fender) doesn't seem to care when I use the 70cm portion on the Motorola xtl5k (gmrs and ham p25).
But the other way around the Motorola gets pissed (overloaded). It seems the Motorola is a lot more sensitive than the Yaesu. So normally I shut down the Xtm400 when using the Motorola and vice versa.
Makes sense to me about the sensitivity. I mean new the Xtl5k were like $3k new and the Yaseu was about $500 new.
Curious to see if the Harris 100m is going to be the same situation. Especially, since the harris will be on a triplexer with 3 different antennas.
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Next…will multiple antenna installed on this plate or a solid plate cause interference or feedback into a different radio in the same vehicle when multiple radio installed are on on the same vehicle?
Yes, it could. Especially, if the frequencies in use overlap or are harmonics.
Even if they aren't overlapping or harmonics of the same frequency, the fact they are close to each other will effect performance. Rule of thumb is try to keep separation of antennas at least one wavelength apart of the lowest.
You won't really know the effects till you try.
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Illegally yes. Unlike ham, gmrs repeater pairs are channelized and the repeater pairs are pre-assigned. This includes input and output frequencies on gmrs.Can two 2 repeaters work together from opposite ends of ranch
Handheld to repeater 1 to repeater 2 to Handheld 2
Someone tried it locally by reversing a repeater pair. Which on gmrs is illegal.
You can, run into a host of issues. One of the big ones is looping between the 2 repeaters, until one times out or burns up. Whole host of reasons not to.
Usually, easy fix is get the antenna about 100 feet up in the air (tower, tree, building) clear of obstruction. Then you'll average 12-18 miles of foot print (give or take 35 watts). Of course, mileage will vary with terrain and with repeater wattage/equipment.
May I ask what spurred this thought process?
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Good to knowThere is definitely capacitive coupling. It's not magnetic so the mount won't hold, but electrical it will work just fine.
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Yes aluminum will work as a ground plane. Just not with a magnetic nmo.
The foil is non ferrous so the magnetic nmo won't adhere thus no real capacitance.
There are plenty of guys running around with drill through nmo mounts on aluminum surfaces.
Hell alot of antennas are actually made with aluminum. Most common being tv antennas.
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If you could get the repeater high up and close to the edge of your coverage, then you could theoretically double your range.Hi -
Debating whether or not to purchase a repeater ( Retevis RT97 ) taking in consideration my location.
I live in the suburbs where the highest sea elevation is maybe 25' and its down to 8' or so. No mountains or valleys, just level. Live by the ocean on the east coast.
I'm using 2 Baoefeng GMRS -9R 5W radios. The distance between the 2 radios is about 1.5 miles. I can transmit, have to move around bit to find a good signal but other than that, it works good. Can carry a conversation, etc. After 2 miles its over, no reception.
I know if I'm up higher there would be no problem.
Here is my question....
Would using the Retevis RT97 actually improve the signal?
The repeater would be set up at either location A or B thats about 1.5 miles apart. Nothing in between.....
Live in a condo so can't install an exterior antenna. I'm looking at the 5 watts from the radios vs a repeater pushing 5 watts.
Last, here is another question...
Say cell phones go down, I'm assuming alot of people would jump with walkie talkies ( frs ) which means channel 1-22 would more than likely be a mess. I'm assuming using a repeater in that instance would allow me to operate on the 1-8 repeater channels without interference. With that being said, is it possible to keep a repeater channel private using tones? In the sense no one can listen with a GMRS radio as well as talk?
I'm just throwing around some scenarios and curious some of your thoughts.
Thanks
Marinko
As far as the second question. No. Anyone with a scanner can find you. Anyone with a frequency counter, sdr or just plain radio could find the repeater. Any radio that could listen to the frequency (has it in its frequency range) with a tone decoder. Could decode the pl..
You want privacy and encryption. The commercial license and setup are probably going to do what you want.
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If there was no squelch any channel without a tone would stay open. Then scan would be useless.Or not worry about it. I have the 275. Ive never needed to nor worried about squelch. I installed it, turned it on and talk to other jeeps. Simple.
Again it is probably the s9.. turn it down to s1 and see if the frequency stays open.
EDIT: Just saw a clip on the 575.. squelch only shows s9. Then you can set squelch. Maybe the new 275s have newer firmware that mimic the 575.
6min 20 seconds in.
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Don't have the radio. But I am going to infer that "s9" = squelch is set to 9 out of 10.SQ is in the manual. On the 275, there is S9 in the spot that supposed to be SQ.
Hopefully, someone with the radio can confirm.
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Aliexpress and one other store are the official ones if that matters.So I guess I should figure out which NanoVNA to buy. Looks like a couple models
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Have you thought about hatch or hood mounts.The tops of the bars are right under the top of the spring part on the 72g. It works better on the roof between the bars than on the plate mounted to the top of the bars. Figured mounting the plate would be a double bonus, maybe better for the Nagoya and also get an NMO mount for other antennas.
5th Gen 4Runner Roof Rack | 2010-2024 4Runner | Sherpa Equipment Co. (sherpaec.com)
Or the wanna be... high clearance bumper with antenna mounts....
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That laird is pretty short antenna, is it any of it viewable above the basket?
If anything the basket is probably causing some screwy swr and radiation patterns.
Hence, why I have been eyeballing low profile flat racks or just ditching my roof rack on the landcruiser.
From some anecdotal, both by the butt meter and nano vna, testing I did with 1/4 waves and such even when I had a z71 suburban, the big boy roof rack played havoc on shorter antennas.
If they are mag mounts try to keep about 6-10 of roof underneath the antenna and recheck swr. Then bring it closer to the roof rack you should also try making contacts. The roof rack or other accesories close by will give you grief. If you can clear these obstacles you probably will get better performance.
One landcruiser, owner on expedition portal had a rack made. Company became prinsu, but either case he had it made with ears on the back that were also a bit folded. To mount two 1/4 wave antennas. What he failed to mention is that he had to strap (ground straps) parts of the rack to the interior roof to main continuity between the rack and roof (improving his ground plane). The ground plane size and shape can and will affect performance.
In your case I don't think it is a ground plane issue, but more helps to a degree. I believe you are seeing these results due to where the antennas sit in relation to the basket. I also think you should mount them to the hood and double check swr numbers to make sure all is good.
Another note paint types for antennas are really going to matter on the active element more than the ground plane.
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It means the repeater is for REACT members or they are the primary users of said repeater.
Radio Emergency Associated Communications Team.
Here is a link to a local REACT group near me. In my county they use CERT teams.
https://www.howardcountyreact.org/]https://www.howardcountyreact.org/[/url
https://montgomerycert.org/]
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Do you guys have a business radio license, much less really need dmr?
I imagining yes, since it is a security team you guys probably also want encryption, which is legal with the business radio license. This radio unfortunately does not have encryption that I can see, so nix that comment.
Being kenwoods they are probably pretty decent.
Maybe lscott can chime in since he is a kenwood fan.
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You got a pm.It is the one CHP uses (or was going to). They are available, but not necessarily a stocked item. Kenwood will make them in batches though. I know some guys were working on a few things with those lowband decks.
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NX-5600HB Is that the one that was for the CHP? I thought California patrol pulled out of that and Kenwood nixed the project.I believe the NX-5600HB now can do P25.
Looking at the XG-100LPA, it was only certified for 16K0F3E per the FCC grant. I did find the manual for it though, and it was an RF sensing.
I see one option is use a MiniCircuits broad band amp that will take the 9mw up to maybe 2 watts then use a Tricom RAMP-25 to put out 25W, but I don't know if anyone has said anything about how to key it, or if it will work with with receive audio.
I've looked a low band (I am interested in at least listening to see what is out there), but in actual application the mobile antenna is going to be huge and narrow banded to be effective.
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Thank you. But beyond my current knowledge scope. I have a few guys looking at options. So if we figure it out, I will pass it on.This is going to be an application that will require coming up with something on your own. You are going to need to design it and build it, or have someone do that. Obviously there was an option for them, and I don't doubt that there were a few factory made units. But those don't seem to be surfacing. Either the few that were purchased are still in use, or they were scrapped instead of making it to the secondary market.
But designing an amplifier for this application shouldn't be all that difficult, at least if you have some sort of accessory connector on the radio that has a keying output for the low band to control the amp. It's going to be a bit more complex than a CB amp due to the requirements for proper biasing of the driver and output transistors for proper linearity due to it being FM and possibly P25 (don't know if the radio does digital modulation on low band. Power output is going to depend on your amplifier design, which will no doubt will need to be multistage since the initial power level being amplified is rather low. But if you design for a 10 dB increase in power per amplifier stage, then it's just how many stages are needed to reach the desired power output level starting with what you have.
The other positive to this is it's low band (30 to 50Mhz). By that I mean that things like the trace length in the circuit board don't really become a factor at those low frequencies. If this were 900Mhz or even 440 to 450Mhz then even the design of the circuit board, trace capacitance and inductance comes into play and needs to be considered for the design. But again, that's not really a factor here.
Unfortunately, there are no p25 low vhf band options.
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Hmmm... Is the Radioddity DB20-UV just an unlocked DB20-G?
in Equipment Reviews
Posted
The db20g/779uv are passively cooled. Don't use it enough to have it shut down. That is what the Motorolas are for.
I do have about 5 friends that have added pc fans to the 778uv. Since they would get hot enough to clip or even shut down.
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