Cheap Ebay £2 fake Nagoya NA 771 antenna tested for SWR with a Nano VNA Antenna Analyzer. Terrible results !
Пікірлер: 146
@PaulTaylor14 жыл бұрын
Notwithstanding your previous commentors, I believe you should attach the antenna directly to the meter and then hold it like you would hold the radio. Then your body will form the other half of the antenna, which is how they are intended to be used. If that's still bad, fair enough! 😊
@CB-RADIO-UK4 жыл бұрын
Yes i could try that although it would be hard to record the reading on the camera. Yes a good video idea thanks.
@CB-RADIO-UK4 жыл бұрын
Ordered a Male-Male connector so will try the test again when it arrives.
@FB-np7cg4 жыл бұрын
I believe also part of the official testing procedure adds a head to the mix as you'd hold this near your mouth. This won't cure the fake here I promise!
@CB-RADIO-UK4 жыл бұрын
@@FB-np7cg Well i will do my best and try as close as i can. Should be interesting to test.
@notsure78743 жыл бұрын
@@CB-RADIO-UK hold it facing away from you and put a camera on it? Be a pain in the neck, but you can read it that way.
@RingwayManchester4 жыл бұрын
Love your enthusiasm mate and how you explain stuff dead simply. Spot on, enjoyed this!
@miquel98984 жыл бұрын
As a lot of people already Said. Connect antennas directly to VNA, if it Is not possible use as short coax as you can And use that calibration set to calibrate VNA with this short coax, thats why you Have that set in box in the first place, otherwise it could be just calibrated in factory.
@CB-RADIO-UK4 жыл бұрын
Thanks. A coupler is ordered and will follow up with the antenna connected to the Nano
@rilosvideos8778 ай бұрын
The extended lead will also effect the SWR and input impedance probably. I wouldn't use a too long table. Just make sure you do the test under repeatable defined situation ;-)
@hfvhf9874 жыл бұрын
I cut one of these open and it was literally just a 36cm whip, no loading whatsoever so it is essentially a 1/2wl end fed on 70cm except it has no loading and is too short to be a 1/4wl on 2m. So no use on either band.
@CB-RADIO-UK4 жыл бұрын
No loading at all ? Thats not good :-(
@hfvhf9874 жыл бұрын
@@CB-RADIO-UK Literally nothing, just a bit of wire connected to the center of the SMA, cut it down to a 1/4 for 70 and it might be ok lol
@CB-RADIO-UK4 жыл бұрын
I might cut one of mine down to look. Not really surprised though.
@M7XCB4 жыл бұрын
@@CB-RADIO-UK would be interesting if you make a video of it.
@michaelchambers7691 Жыл бұрын
The SWR of my Nagoya NA-771 antenna I got at the swap meet is around 2.0:1 on both bands. That's livable.
@alienwarex51i3 Жыл бұрын
Mine is 1.01 at 446 MHz and about 1.5 at 146 MHz. The Baofeng F8HP I got transmits 8W on UHF and 6.5W on VHF at max power. I'm swagging.
@357Muzzleblast Жыл бұрын
Want a good budget antenna? Get an Abbree tactical or other foldable antenna. They're ugly and unwieldy, but they are superb antennas. Don't know about the tri-band models, but they should work fine. I have a Nagoya NA-24J and the Abbree works just as well if not a little better. Thee 24J is far more difficult to copy, so you're more likely to get an original. Order from BTech or Amazon. Once you get a genuine Nagoya, you can easily check other antennas claiming to be Nagoyas by putting them side by side. The thing is, Nagoya antennas are well made, but they don't really extend one's range as much as you'd think. Looking at a graph is one thing; field testing's quite another. If it were me, I'd buy a Diamond Signal Stick or the 24J Nagoya.
@duncanpotter53234 жыл бұрын
Another quality report thank you, I would really like to see what is an upgrade for the UV-5R what can be sensibly purchased with reliable results...
@foxman3623 жыл бұрын
Fred in the shed is right i got my nano vna just yesterday i might make my own antenna for beofeng 12 gauge bare copper wire will work.
@novivi43902 жыл бұрын
Finally a VNA test of an antenna.... THANK YOU !
@larsjohansson442 Жыл бұрын
I tryed my fake 771. It worked ok at 2m (1,3:1). At 70cm it was a disaster (6:1). I only use it on 2m.
@foxman3623 жыл бұрын
have try take it outside maybe swr would be lower it could be rf noise in your home or your shed.
@foxman3623 жыл бұрын
Try get some 12 gauge bare copper wire cut same size as na771 see if swr is diffrent compare homemade one and na771.
@janbundell64344 жыл бұрын
Food for thought Fred....it’s a learning curve mate.......Bob
@CB-RADIO-UK4 жыл бұрын
Yep. Interseting stuff Bob
@redjohn200014 жыл бұрын
Is it possible to clip a little off the top and replace the cover. This would shift the tune point to a higher frequency.
@foxman3623 жыл бұрын
the fake na-771 one i have got 20miles out on frs back in oct 2020 on uv5r.
@robertburdoff1789 Жыл бұрын
I bought a Btech Nagoya 771 for an Australasian plan CB (476-7mhz) .... "120-900mhz" - Sweet!! ...but missed the bit where it says receiving only - I think it's optimized to 430 & suspect this is true of most general antennas out there - I also suspect some are being marketed for use outside of their working spec's too.... Anyway, so out of CB & GMRS range :) notarubicon did a vid on tuning antennas (trimming with wire cutters)... I don't know what frequency's you use most, but might this be an option to tweak the swr back into the park? I guess it might be academic if faith has been lost but might be an interesting exercise if the only other option is to bin the antennas..... ....Ah, & ground plane - wondering if you can use a metal plate as one, as is recommended for mk2 surecom SW102's???
@larsschmidt72494 жыл бұрын
i dont think having the antenna away from you would make much difference for swr. the antennas are made for hand held radio its designed to be used right next to you. your not holding the radio at arms length away when using it. i used my uv5r for the Australian 80 channel cb 476-477 mhz and the fake antenna did perform a little better than the standard one but not by great amounts. is testing the swr going to be accurate on such a little antenna they are not the same as a mobile car antenna or base station. more to the point before you tested the antennas with swr meter did they beform better? if they did i would'nt worry about the swr i dont think the standard antennas would perform any better on swr meter.
@kriscopper674 жыл бұрын
Yes, we did the same on PMR446 and the talk range increases greater than the standard UV5R/888s stock antenna etc. The VSWR results is still dubious and better to double check with analogue SWR meter such as SX600 etc.
@michaelchambers7691 Жыл бұрын
I got a Nagoya NA-771 antenna for $5 at a HAM swap meet and placed it on my RadioShack HTX-245. It works.
@AndrejaKostic4 жыл бұрын
Hi Fred, be VERY careful about the use of wrench on the SMA connectors! The key point is to tighten the SMAs properly. Not too loose and not too tight! Overtightening the connectors can cause the internals of the female connector to spread out, which can cause intermittent connections later on. Also be careful with how you're applying the torque at the connector. On there NanoVNAs, the connectors aren't installed in a very secure manner. They're usually just soldered on the pin side, and the other side of the connector has often no solder. This, together with use of a wrench, can cause the solder joints to crack, which can again lead to intermittent connections. There are proper SMA Torque Wrenches, which will automatically disengage when you reach the appropriate torque, but such a wrench alone could cost around 2-4 NanoVNAs, so obtaining a proper one might not be economically justified in this case.
@CB-RADIO-UK4 жыл бұрын
Yes good call. Thanks for the advice i will take it easy with the spanner
@kevinconnolly63304 жыл бұрын
Thanks for the video Fred.
@gmallada4 жыл бұрын
great video!!! thanks for upload! .... Try again with 4 radials ground plane of 50cm . Handheld transceiver uses the operator body like Ground plane.
@CB-RADIO-UK4 жыл бұрын
Thanks for the tip!
@alfe14022 жыл бұрын
Why, in the city, my uv5r 8W barely gives me 750mts of range??? Is because of the city or is the radio???
@CB-RADIO-UK2 жыл бұрын
Prob reduced by buildings blocking signals. I can only get 1-2km in a built up area myself
@foxman3623 жыл бұрын
I bought one today this would help me out for cb ham hf also weather noaa sat stuff apt.
@allsortsabouteverything4 жыл бұрын
Another good video Fred. Would it be worth doing a comparison test on an in line swr meter of a reputable make. I suggest something with a reasonable price like the Avair AV601. Something is telling me not to put too much faith in that VNA.. How about also checking a reliable antenna with the VNA like your amtron99.?
@CB-RADIO-UK4 жыл бұрын
Prob a good idea Barry. Iam not going to get too much into these 2m/70cm antennas as really iam just using them to learn about the meter. What i really want to use the Nano for is building dipoles.
@allsortsabouteverything4 жыл бұрын
@@CB-RADIO-UK That's fare enough Fred but you need to know that the VNA is a reliable one otherwise you will be making dipoles that are way off resonance. That puts your other gear at risk. Maybe use it now to build a dipole then connect it to an in line swr meter that you know is reliable. I'm just not sure if I would be trusting that VNA tbh.👍
@kriscopper674 жыл бұрын
Good morning Fred. Could you please try to use analogue SWR meter as a cross reference when testing the fake RH771 at f=446Mhz? TX at max 5W and see the reflected power. Very good video review of yours. Cheers!.
@CB-RADIO-UK4 жыл бұрын
Hi. Sorry wont be able to do that as i dont have the adapters.
@kriscopper674 жыл бұрын
@@CB-RADIO-UK Aye, okay and thanks for sharing. Regards. Azlan
@DAVIDGREGORYKERR3 жыл бұрын
Get a linear that uses vacuum tubes instead of solid state components, what about making a Slim-Jim antenna for 446MHZ.
@john-paulattwood45154 жыл бұрын
That does seem like a surprising result. Could you perhaps consider sacrificing an 888 by doing a practical test with one of these antennas? A simple "does it actually get fried" / range check should surely be able to confirm whether or not the SWR really is that bad 🤔
@CB-RADIO-UK4 жыл бұрын
Already did that 2 yrs ago :-) Here's the link. kzfaq.info/get/bejne/ps6Xn9WUxMfKXWg.html
@john-paulattwood45154 жыл бұрын
@@CB-RADIO-UK Thanks! I just watched that video, actually the fake 771 sounded a lot better than the standard antenna. So, something doesn't add up... This is intriguing, needs more investigation surely? Thanks for the interesting videos.
@JesterHellsingborg4 жыл бұрын
Thanks for video....usfull as always...... can you shorten the antenna so the swr goes down?
@whollymindless3 жыл бұрын
I bought one that claimed to be genuine (and was priced like genuine) but it scored a 7+ in UHF. But now I know.
@coxont57894 жыл бұрын
Special person, your measuring half the antenna system on a handy doing it like that.
@michaelchambers7691 Жыл бұрын
Use Diamond antennas on Yaesu HT's.
@guidelineuk4 жыл бұрын
Nice one fred ... I finally got a real one 13 quid with both rubber washers
@CB-RADIO-UK4 жыл бұрын
Best way to go. Safest.
@guidelineuk4 жыл бұрын
@@CB-RADIO-UK nice one for the heads up I will put the rubber ducky back on the other one... do you recommend me getting one of these fake nano.. it's in my watch list👍🏽
@guidelineuk4 жыл бұрын
www.ebay.co.uk/itm/201800104377.... have a look
@God-yb2cg4 жыл бұрын
Well, rip. Wonder how practical would it be to homebrew handheld antennas because it doesn't make much sense to pay 20 bucks for an antenna for 10bucks bf-888s
@CB-RADIO-UK4 жыл бұрын
Yes thats the prob with cheap radios.
@rilosvideos8778 ай бұрын
These seem to be really bad fakes! I saw some other videos testing the (fake) NA 771 with much better results! There is also a video were they open up both a genuine and a fake antenna. The genuine had some matching circuitry in the bottom part with small coils and little caps! So i guess they do a quick manual matching for each antenna - resulting in the higher price tag. With my (probably fake NA 771 but for around 6 Eur) i managed to hear the ISS space station 3 times when it passed. I wasn't able with the orig. baofeng antenna (signal stick copy). Also try to use a counterpoise (wire attached for virtual ground) - this can really change a lot! Consider in real life your hand and body would act as a counterpoise for the antenna!
@CB-RADIO-UK8 ай бұрын
Yes i did crack one of these open on another video.
@WaschyNumber12 жыл бұрын
It's more likely that the connectors get destroyed with the wrench.
@andrewknight68534 жыл бұрын
I wish to god you would have tried the stock factory antenna on the same set up! that is something i would have definitely done for a video!
@CB-RADIO-UK4 жыл бұрын
I did in the prev video on the Nano
@andrewknight68534 жыл бұрын
@@CB-RADIO-UK whats it called??
@keithh50534 жыл бұрын
Hi again Fred. Have you considered using a counterpoise or as it's sometime called "a Rat Tail". There are a few youtube Vids about these . With the supplied antennas you only really have one part of a half wave. If you add a counterpoise you are effectively completing the antenna. My friend has tried this on a handheld and got really excellent results. SWR came right down to a useable level and the signal went up by 3 S points. He told me the the counterpoise was 19.3 inches. Just an idea you might consider trying. Cheers & 73s Keith
@CB-RADIO-UK4 жыл бұрын
Thanks for the suggestion. There was a real lift in 446 coms throughout lockdown. Nothing in my area yet but iam hopeful.
@notsure78743 жыл бұрын
Somebody pulled a boot up on one of those fake nagoyas, and there was no coil, which explains a lot.
@pda491844 жыл бұрын
Interesting stuff Fred.. Have you tested any of the antennas that came with your radios using the same method ?
@CB-RADIO-UK4 жыл бұрын
Yes pete on the first video.
@paulsengupta9714 жыл бұрын
Can you try the other OEM antenna(s)? The Baofeng one which tapers in and then continues fairly thinly to the top is supposed to be better than the "chunky" one, particularly on the amateur bands. I have both, myself, one of which came on each UV-5R I have, and I ordered another one of the "slim" ones as the chunky one, as tested in the first video, wasn't great.
@danidanovic18574 жыл бұрын
superb clip bro you should have more views
@bruceclark56274 жыл бұрын
Have you a way to see if the antenna uses the radio as a counterpoise?I would try a field strength meter and compare the fake to an genuine.2CM3284/KE5SRB.CHEERS from the States mate!
@CB-RADIO-UK4 жыл бұрын
Yes the ground plane angle is interesting.
@glacierglider75314 жыл бұрын
Try it on your antron 99 antenna.
@CB-RADIO-UK4 жыл бұрын
Yes going to try that. Waiting for a adapter connection cable.
@glacierglider75314 жыл бұрын
Im waiting for delivery of the vna, got the adapter’s, looking forward to your next vid, keep em coming fred.
@oldmanandguitar2 жыл бұрын
Not convinced this test is accurate as the antenna has no ground plane, mounted on a car or handheld held in hand the result would be different. The mag mount alone is not enough. It has to be connected directly to ground through body or car, if not the ground plane/radials need tuning. I would check on car for best result, if only using on PMR you can cut the antenna to a quarter wave whip, the antenna is a 1/4 wave whip for 70cm with a trap/loading coil added. On 70cm the antenna only transmits from about 17.5cm of the antenna. On 2m it works as a top loaded antenna. 2e0deq.
@Tobinindustrial4 жыл бұрын
It is amazing how far off an antenna can be made on purpose. They must think that most radio operators would rather cheap god looking antennas rather than a performer.
@CB-RADIO-UK4 жыл бұрын
Its looking that way Andy. Ive got some further tests to do to find out for sure.
@mcjjordan4 жыл бұрын
Be interested to see how the stock antenna tested to compare
@CB-RADIO-UK4 жыл бұрын
kzfaq.info/get/bejne/g5dyhK16nLGaaXU.html
@fernandoscrenci95554 жыл бұрын
Use those antennas for receiving only!! \scanning!!!
@Team-fabulous4 жыл бұрын
Have you tried measuring the SWR on the antennas supplied with the radios.....
@CB-RADIO-UK4 жыл бұрын
Hi yes did that on the first nano video if you take a look.
@fixitdaz4 жыл бұрын
hay Fred what is the impedance of the antenna, some handhelds use 75 ohms and not the standard 50 ohms
@CB-RADIO-UK4 жыл бұрын
Does not say on the antenna.
@fixitdaz4 жыл бұрын
@@CB-RADIO-UK you would need to check the impedance with the vna hope it helps
@CB-RADIO-UK4 жыл бұрын
@@fixitdaz Yes i should be able to do that. Thanks
@richardmillican77334 жыл бұрын
Seen a mod ... rat tail ground plane... Quick question Fred.... First ssb.... I've seen your videos championing Ss 6900 n What about the Alinco Dr 135 dx ( 10dx )
@CB-RADIO-UK4 жыл бұрын
The Alinco 135 is thought to be a step up from the 6900N quality wise although the performance is the same.
@richardmillican77334 жыл бұрын
Yeah, I know this might seem a daft reason, but I think im gonna go for it, purely for its looks. Not sure if clarifier is "clicky" but the one plus I suppose is the programming cable has an external port.
@FB-np7cg4 жыл бұрын
What you are finding out is something I've seen for a long time , basically I ripped apart a cheap 'clone' and it had no loading , the closest it came to resonance was about 160Mhz. The best thing for these is trim them down to a UHF quarter wave!!! I jest you not. The main problem is that people buy these and convince themselves they're an improvement. they aren't. best antenna i've seen is the stock uv5R antenna for tune. great on 2m and 70cm! I guess 90% of the chinese antennas are crap , I have a big pile of them and theyre all shite! please people wake up and listen to this guy!!! I do have 1*771 which actually tunes on UHF and VHF. I also find 701's useless too!!!
@CB-RADIO-UK4 жыл бұрын
John your prob right. When ive finished playing with it i will take these fakes apart on another video and give you a shout out. It will be interesting to see if there is any base loading.
@paulhotson58204 жыл бұрын
Looks like your antenna mount ground plane is to small.
@robredridge17032 жыл бұрын
Have you done the same test using the original antenna from the UV5R? If so what results did you get?
@CB-RADIO-UK2 жыл бұрын
Hi Rob. I cannot rem if i tested the stock antenna. If i did it will be in the nano videos.
@DrWatts-bi1jv4 жыл бұрын
It's never gonna measure right without a ground plane on the aerial to balance it out. Unless you are measuring a Slim Jim you must have a ground plane 😉 Any aerial without a decent ground will peg the meter as you found out with your loft aerial experiments 😊
@CB-RADIO-UK4 жыл бұрын
Yes thats making sense. I will be trying the antenna attached to the meter on a future video to see if that balances out.
@AhmadIrfanAW3 жыл бұрын
please your resume of this video about NA 771
@CB-RADIO-UK3 жыл бұрын
Try this one. kzfaq.info/get/bejne/ps6Xn9WUxMfKXWg.html
@martinva2wf7184 жыл бұрын
It’s crazy what’s the différence building à fake one and true one ? We are not talking about Rolex watch! It’s ruber and copper wire... VA2WF
@CB-RADIO-UK4 жыл бұрын
The next 771 video i will open up the fake and look inside
@jacquesdebruyn67484 жыл бұрын
Don't these antenna actually need a ground plane to function properly?
@Bartok_J3 жыл бұрын
Coincidentally, I was testing my NA-771's this afternoon before I saw your video, having also acquired a NanoVNA. I tested how others have suggested - attaching the antenna directly to the VNA (with a gender converter where necessary) and holding it like I would a radio. I'd (wrongly) assumed that Nagoya was a cheap (mainland) Chinese brand, and hadn't realised it was actually in Taiwan and rather better, hence worth faking. All three of my NA-771's were fake, but at least usable, and with roughly the same curve. Optimum SWR around 200MHz but usable (just - SWR
@CB-RADIO-UK3 жыл бұрын
Interesting results. Just goes to show that not all fake 771's are bad and most are prob usable. Just no real quality control.
@Bartok_J3 жыл бұрын
@@CB-RADIO-UK On second thoughts, only just about usable. ;-) One of them I only ever used on 70cms (a slightly unusual yellow one that I bought to match my slightly unusual yellow BF-888S) so I decided to cut it down. As predicted, it's a simple steel (?) cable, quarter wave resonant at around 200MHz. Why does it seem thicker towards the base? Simply 'cos there's a double thickness of shrinkfit. Anyway, I chopped it down with a bolt cutter, carefully removed and transferred the rubber titty off the end, and it works a treat. SWR better than 1.5:1 over both 70cms and PMR446. ☺ I'll carry on using the bogus Diamond - it's obviously fake, but it works fine - and keep the "Nagoyas" for emergencies only. Though I might treat myself to a genuine one from a UK source - my TYT handheld is opposite gender to my Baofengs and using a coupler is a bit fiddly.
@Bartok_J3 жыл бұрын
I'll add that I checked the various stubby antennas that were supplied with the radios, and they were all fine. The optimum SWR tended to be a little lower - about 410 - 420MHz - but still well below 2:1 on 70cms / 446.
@craigspada16767 ай бұрын
Great video! I always stick with Diamond and Comet, you get what you pay for. The videos answered a lot of questions. WA2TWF
@CB-RADIO-UK7 ай бұрын
Yes its sometimes worth paying the extra.
@jmauricioparra4 жыл бұрын
Es para VHF y UHF...... No solo UHF
@higuys11704 жыл бұрын
😍Love you Fred😍
@CB-RADIO-UK4 жыл бұрын
Hey HI GUYS ! Where you been bud ?
@brunobassi24404 жыл бұрын
warning! DH-771 antenna is fake this antenna only works for 1.1Ghz-1.7Ghz
@_specialneeds Жыл бұрын
Nagola?
@brunobassi24404 жыл бұрын
Retevis 771 is much better than Nagoya 771 (no fake)
@Legend813a4 жыл бұрын
What about VHF 138-174?
@CB-RADIO-UK4 жыл бұрын
Did not test down that far on this video.
@paulsengupta9714 жыл бұрын
Go for it, I'd like to see! I've got one of these fake 771s and it does work better on the ham bands than the stock antenna, more on 2m than on 70cm (maybe not surprising because of the physical length). I tried ordering a Nano VNA but the seller asked me to cancel for some reason. Not got round to ordering another one.
@2j4ez4 жыл бұрын
What was it like on 70cms?
@CB-RADIO-UK4 жыл бұрын
Not tried 70 cm yet.
@attilarivera Жыл бұрын
8:37
@pervypete53164 жыл бұрын
Ere, aint you got lovely skin
@CB-RADIO-UK4 жыл бұрын
LOL
@yotubeurk4 жыл бұрын
50 Ohm or 75 Ohm kabel ?
@CB-RADIO-UK4 жыл бұрын
Patch lead is 50 ohms.
@jacquesdebruyn67484 жыл бұрын
I just find the pronunciation of nagoya with an L interesting