What's the best method to use to tune a manual ATU? Let's find out... NOTE: If you are tuning using RF from a radio remember to release the PTT before you rotate the inductor selector switch.
Пікірлер: 148
@johncliff54176 жыл бұрын
I want to say a big thanks to you for taking the time to explain to the new amateurs how to use a manual tuner. I started off with the old Military style variometer, ie. crank it up to get an antenna current reading showing on the meter and usually adjust a capacitor to tweak for maximum. This was done at a rate of knots so you were spending minimum time sending out a carrier. Totally crazy has you then spent ages on that frequency banging away on the key passing all the required traffic that needed sending. 73 de John - G0WXU.
@vk6cs4566 жыл бұрын
Thanks for the feedback John. Of course it's much easier when no-one is shooting at you.
@garrycullum38614 жыл бұрын
Thank you. Just coming back to ham after 20 years away. I had completely forgot how to do this...
@ericletts40724 жыл бұрын
Great Video, Thank You very much ! I have had my license sense the mid 90's and I am confined to the 2 meter band, it wouldn't be so bad but I live in a small town, everybody knows everybody. I bought a brand new Base radio with HF&6 meter four years ago, and it still sits in the box, never used. I got into this hobby to talk around the world, not around the block. I am one of those people that put down the Ham radio, and went to C.B. !
@maartenc60993 жыл бұрын
The slightly more forward power is a myth. What is actually going is that there is a phase variant between reflected and forward power. So you are measuring more forward power but this can not be true since your transmitter is only a certain power. Say 1 Watt. Make your SWR slightly higher and you see more forward power. If you really want to measure what the best tuning position is, get a field srength meter and try to find the 1:1 position that gives you the highest field strength. That is the position you need.
@ki6bge7 жыл бұрын
Thanks for the video. I discovered that the reason I couldn't tune my homebrew 40 meter dipole wasn't a problem with my antenna but the procedure I was using for the tuner. I now have a 1:1.1 match with 0 reflected power.
@vk6cs4567 жыл бұрын
Thanks for the feedback. I'm glad you found it useful.
@SKYGUY14 жыл бұрын
K4KID here... Typically you have to double your power (3db) for someone at the receiving end to tell the difference so the needle's breadth of increase is negligible. Thanks for the lesson though. As for reflected power... I would prefer 10 or 20% less power out w/ ZERO reflected power to keep my finals happy. I have a 31 year old Kenwood TS130 w/ the original finals that still produce full rated power and I think that's because of the "LOVE" I've shown them. Happy airwaves to all. K4KID
@CarstenBauer8 жыл бұрын
Thanks VK6CS, this video filled in a few gaps. I have never used a tuner before so this will definitely help me when I do get a tuner.
@vk6cs4568 жыл бұрын
+Carsten Bauer Good to hear... thanks for the feedback Carsten.
@adelarsen97764 жыл бұрын
This is a really good video. After 40 years you've got the gist of the hobby. I learned something, thanks :-)
@MrTonyd19542 жыл бұрын
That makes 2 of us
@daveys4 жыл бұрын
Excellent video, many thanks for the clear demonstration!
@MrTonyd19542 жыл бұрын
Best video on how to use a manual antenna tuner in conjunction with a analyzer. No worries on blowing out your radio
@richardt90926 жыл бұрын
My brother told me he couldn't tune his antenna, I watched this and tuned his antenna using your instructions. Brilliant. Thanks :) 2W0RTJ
@vk6cs4566 жыл бұрын
Thanks Richard, glad you found it useful.
@rocknrob119 жыл бұрын
Thank you very much for your videos. I'm just getting started after a 28 year absence from radio, and I'm very happy that you posted these. Actually, now that I've seen your videos, I'm contemplating buying the FG-01 Antenna analyzer. Seems to be the missing link between your transmitter, swr meter, and antenna. Makes tuning a breeze. A little salty on the price, but it's probably worth the money. Again, thanks for posting these, and keep up the good work.
@vk6cs4568 жыл бұрын
+Robert Hughes Thanks for taking the time to post the feedback.
@KX4UL6 жыл бұрын
Very interesting concept. I have always gone by the method recommended by MFJ. The other way may have tweaked out 1-2% more power, but NOT worth all the time and trouble. I really like that small sized antenna analyzer!
@Whiskers19498 жыл бұрын
I've been quiet for many years. Trying to get back to speed and get back on HF again. This vid is a great help. Well done. I spent over 20 years developing technical training programs so please understand that I appreciate your succinct delivery. Too many put too much unnecessary "stuff" in their vids. WA4OKO
@vk6cs4568 жыл бұрын
+Thomas Robinson Thanks for the feedback, it's good to hear I'm doing it reasonably well from someone with your background.
@paul-19636 жыл бұрын
Thank you I have used your method and it works a lot better
@martinkokss3460 Жыл бұрын
a good experience is an example to follow, thanks for the experiment
@johngulliver61518 жыл бұрын
Great tutorial video i always use the first method and have done for years i was told to do it this way by a dear friend G3MRP now silent key set the caps mid way point listen to the band you wont to tune and move the inductor you will hear the signal come right up you now know your in the right place to start tuning .Thanks for posting i know its an old post but i just stumbled across it cheers from across the pond.
@vk6cs4568 жыл бұрын
+John Gulliver Thanks for the feedback, cheers John.
@jcharos76727 жыл бұрын
I use to do it that way and then I would move down maybe 1 step on the inductance and add a little more capacitance. I use to be able to tune it with out a SWR meter by using a receiver and turning down the RF gain very low and turning up the audio high. You can really hear it when it is peaked.
@CorbyStarletCj19 жыл бұрын
Excellent video, I actually understand tuning better now, Thank you
@vk6cs4569 жыл бұрын
Thank you for the feedback... I'm glad you found it useful.
@jcharos76727 жыл бұрын
I use to work you guys (VK/ZL) back in the early 1980s on 20 Mtrs running a Signal One at 5 watts and a 40Mtr dipole. VK6 and VK7 were my favorites.
@vk6cs4567 жыл бұрын
I worked VK from London in 1987 when I got my UK 'A' licence. Just 100W and a bit of wire down the garden. You can work the world on next to nothing when the sunspot cycle is generating lots of spots.
@nlo1144 жыл бұрын
I used an Ericsson auto AMU many years ago that tuned under low power. It started with min L and min C, then increased L until max fwd power, then increased C for min refl power. As the refl power dropped, the fwd increased. Further fine adjustment could be done after the auto had run to obtain the best match.
@olechuga27 жыл бұрын
Sir, this an outstanding video ... very informative. Thank you Sir, very much indeed, and for your hard work on this presentation.
@vk6cs4567 жыл бұрын
Thank you Sir very much for the feedback, and those kind words.
@tonymeredith1000f9 жыл бұрын
Thanks for posting, Just ordered this model and has helped me understand it much better, your time is appreciated.
@vk6cs4568 жыл бұрын
+Tony Meredith Thanks, your time to post the feedback is appreciated.
@EdzashedFudwinkle2 жыл бұрын
I have just bought the MFJ 945e, lively piece of kit, hopefully I chose wisely 🙂 as I am new to tuners & HF Radios, so always good to see tutorials on use, 73's 26-CT-4078 Mcr. 🇬🇧
@Chris.Schulz9 жыл бұрын
I found his video to be very educational and interesting. I don't post many comments, but this one was worth a mention. Will look at some of your other videos. Great video!
@vk6cs4569 жыл бұрын
Chris Schulz Thanks for the kind words, and for taking the time to provide the feedback.
@aryowiediarko25058 жыл бұрын
The old post ... but very helpful ... made me more confident as new rookies in hf five stars added
@vk6cs4568 жыл бұрын
Thanks for the feedback... have fun on HF.
@americaswayout44894 жыл бұрын
You appear to get more power but what is happening is the reflected is added to the out put appearing to have more out. Cross needle meters always add in the swr !
@markhartley24117 жыл бұрын
Bought first manual ATU this week and struggled so far :( Found this very informative and practical thanks - just need to go and put it into practice. I'll be back to say how I got on !
@vk6cs4567 жыл бұрын
Thanks for the feedback. Good luck with it, I'm looking forward to your results. What ATU did you buy?
@markhartley24117 жыл бұрын
Hi, I bought the Comet CAT-300. The unit is fine but the instructions useless. I think it would be in the bin by now if I hadn't found your youtube tutorial . cheers Mark 2E0XCZ
@vk6cs4567 жыл бұрын
There's a couple of videos on that tuner here on You Tube... it looks pretty good. What's a bit less confusing with the MFJ is the inductor is labelled A to L, not 1.8 to 50MHz, so if you choose an inductance that works it doesn't look wrong if it has the the wrong frequency band written on it. I'm glad you found my video useful, thanks for the feedback.
@EdzashedFudwinkle2 жыл бұрын
Ditto for me today with the MFJ 945e, over the MFJ 959c auto, bog difference in Leicester for the manual, but happy with my choice
@flexairz6 жыл бұрын
Second method takes way more time for 10mW more power. So the 50% capacitor and 0% inductance method is much easier to tune.
@craigszwed5 жыл бұрын
I, too, found that model a bit 'fiddly', as you said. Even when I was not transmitting, if my hand got near the meter that made the meter move.made it move. I didn't like that excessive meter sensitivity and I returned it to the vendor.
@andhanwer4 жыл бұрын
the higher power reading with max cap is due to circulating currents and is Not adding to the forward power despite the reading, just to heating. You significantly reduce the max power handling before arc-over of the tuner with this tune as you have to use both more XC and XL Should always tune with least inductance even thought other combinations are possible Least inductance will give you the widest tuned bandwidth and is much less touchy and fussy - less coupling to your hands while operating the knobs and ensures highest max power handling before an arc over
@vk6cs4564 жыл бұрын
Yes, setting the caps to 50% and setting the inductance is the way to go.
@bloguetronica2 ай бұрын
The MFJ manuals differ on that point. The MFJ-949E manual advises you to set the maximum capacitance and minimum capacitance possible for a good SWR. I've followed those instructions and got nice results when using my 11 meters T2LT antenna. I was able to tune and get signal out from 10 to 30 meters. Anyway, the more inductance, the more fiddly the tuning is.
@DavidS-iw4ei6 жыл бұрын
Thanks for the lesson. Great Video.
@vk6cs4566 жыл бұрын
Thanks for the feedback. Glad you found it useful.
@americanfreedomlogistics99846 жыл бұрын
I have the 949E and it is great… 3945 looks good as well
@vk6cs4566 жыл бұрын
The MFJ tuners get the job done, you just have to remember to halve the power rating. What's a 3945?
@OldSweetTed6 жыл бұрын
Still very valuable information. Thank you very much!
@randybird46425 жыл бұрын
Z
@davidkutzik8703 жыл бұрын
Nice video. I wonder if the difficulty encountered in method 2 has to do with the choice of the physical position of the taps. They were factory set with the method 1 in mind. To best set it up for method 2, I guess one can change the tap positions on the coil. Likely a fools errand from a practical point of view.
@zeroed4x7 жыл бұрын
Thanks mate, very informative and enjoyed it very much. 73
@vk6cs4567 жыл бұрын
Thanks for taking the time to give some feedback, and those kind words. 73 Grant.
@LuisXL3 жыл бұрын
Quite good info. ThanX !!
@g0fvt4 жыл бұрын
With my own t-match I used to start with both capacitors half meshed and then find the inductance for best match before making final adjustments to the capacitors. I don’t think that it was the optimum, efficiency was not my problem but flashover at high power was. I know this video has been up a long time, the behaviour of the forward power meter is normal, it does not prove the power to the load is increased. Just a suggestion, put a 100w lightbulb in a box and use an exposure meter or LDR to determine maximum brightness as you tune the atu, many rigs can produce more power into loads that are not exactly 50 ohms with zero reactance. Found your channel via your GS35B experiments, great stuff.
@vk6cs4564 жыл бұрын
Thanks. The difference in output power wouldn't be detectable at the RX end. It was just a fun experiment.
@raytowler22866 жыл бұрын
Nice demonstration, may I add another quick reference point to start with is tuning for noise first, capacity half way then find more noise with induction, most occasionally you are near a reasonable matching point. 😁
@vk6cs4566 жыл бұрын
Thanks Ray. Good point... I'll try to remember that if I do any more of these videos.
@acsmith549 жыл бұрын
Thanks Steve, very informative and looks like Yorkist will get another sale! Andrew VK6AS
@vk6cs4569 жыл бұрын
Thank you for those kind words Andrew. Yorkist, Yourkits... it's You-Kits Andrew, You-Kits! You won't regret picking up one of these if you love playing around with HF antennas, traps and tuners.
@acsmith549 жыл бұрын
VK6CS Yep it is on order! What is your view of the MFJ ATU that you have, would you buy that model next time?
@vk6cs4569 жыл бұрын
Good question... for the application I bought it for, yes I would. I bought it for portable/mobile use so I didn't need an internal balun, or a wire antenna connection post. When portable, a wire antenna terminated with a banana plug will plug nice and snugly into the SO239 antenna socket. And when mobile the coax terminated with a PL259 plug will plug directly into the SO239 antenna socket. It works well from 1.8 to 60MHz and I thought the 6m capability was useful. I wouldn't buy one of these as a base station tuner, but as a budget entry level portable/mobile play-around tuner they're ideal. I have heard you should rate any MFJ tuner at half the power it's rated at, and looking at the internal components that's probably about right. This one is rated at 300W, I wanted to use it at 100W, so I should have 50W of 'headroom'. Tuning it with the antenna analyser eliminates the risk of high voltage arcing on the inductor selector switch and flash-over on the rather small variable capacitors. So far I have not had any problems with arcing or flash-over tuning it with my FT950 and FT857 at 100W in FM mode.(Tuning it in FM mode allows me to see the SWR more easily). The important thing to remember is to release the PTT when you rotate the inductor selector switch if you're tuning with a radio and not an antenna anlyser. When it's correctly tuned, running 100W SSB through it will be fine. If you're looking at getting a good quality ATU for your base station, take a look at LAMCO and Palstar.
@ft67557 жыл бұрын
Great video thanks mate
@vk6cs4567 жыл бұрын
Thanks for the feedback.
@W3TFART6 жыл бұрын
Nice video thanks
@Stephens8x6Workshop4 жыл бұрын
Very helpful, thank you
@vk6cs4564 жыл бұрын
Glad you found it useful. Thanks for the feedback.
@Fishermanfred17 жыл бұрын
great video.😀
@garylanders1470 Жыл бұрын
Very nice, thank you.
@Amyr613 жыл бұрын
Excellent video.... answered a lot of questions for me. You broke it down .... into steps. Thank you!
@Irenaeus-von-Lyon3 жыл бұрын
Thank you!
@wizzard64864 жыл бұрын
Nice job VK2BD
@nateitkin82794 ай бұрын
That was fascinating. Thanks for posting. Any idea why you measured slightly more RF power out despite a higher SWR? Seems counterintuitive. 73
@kb3svj9 жыл бұрын
Thanks for the video.
@vk6cs4568 жыл бұрын
+kb3svj Thanks for taking the time to post the feedback.
@kb3svj8 жыл бұрын
No problem, it's ops like you that help Ops like m e learn. 73
@CroPrepper5 жыл бұрын
Well actually I played around last night. With your method I lost around 2W from my 5W on 80m. Using the MFJ's method I was at my full 5 Watts. Although MFJs method needs more efforts, it pays off.
@vk6cs4565 жыл бұрын
Blimey... that doesn't sound too good. I'll have to watch the video and see what's going on.
@vk6cs4567 жыл бұрын
Fishermanfred 1: I still can't respond to your comment directly for some reason. Thanks for the comment Fred.
@jimmycake71433 жыл бұрын
OK but , say you now have a good match using analyzer. But now I turn my amp on. Do I leave it? or retune while keying amp power through?
@MujoNovak6 жыл бұрын
just ordered one! Hope to win MFJ lottery with good one!
@vk6cs4566 жыл бұрын
Fortunately they're pretty simple. It should be easy to spot any wires that have pinged off or any shorts.
@andhanwer3 жыл бұрын
a lot of you still seem confused about this there is ONLY ONE proper combination of inductance and capacitance for the (most efficient) True Tune there are multiple ways to find it and there are plenty of settings that are just good enough but still ultimately only one is correct only the one True Tune allows for tuner's full rated power handling without an arc
@J_David_Worthington_III6 жыл бұрын
Great video! Thanks for sharing it. 73's KD9JEO
@vk6cs4566 жыл бұрын
Thanks for the feedback. 73.
@jonthebru11 ай бұрын
The user learns their antenna set up. For example if you are on 40 and want to go to 80 and you've done it before you pretty know where to put the settings.
@cadiscase2 жыл бұрын
Try Antenna cap at Max and Trans at 30 % cap. You usually do not have to change the Ant cap again. I use a Heathkit tuner. Thanks and best..
@CroPrepper5 жыл бұрын
I just got the mfj 904h and tried their method. Their method is way too time consuming. Thanks for sharing, 73
@vk6cs4565 жыл бұрын
Tanks for the comment.
@PD1MM6 ай бұрын
Have you also tested how big the differences are if you do the same test with, for example, 25 watts.
@ado757 жыл бұрын
I'm new to hobby, so thanks for this. I haven't got my license yet but have built a 20m doublet (open wire fed) and have just bought the MFJ 949e. Because I'm only listening for now, is there a way of using an ATU to increase receive noise? Do you set it for max reflected?
@vk6cs4567 жыл бұрын
Just set the capacitors half way, then rotate the inductor switch for the maximum noise, then adjust the capacitors to peak the noise level.
@ado757 жыл бұрын
Thanks for that, really appreciate the quick response. One other question, if I use Bypass, will that permit LW, MW, VHF, UHF through to my SDR? again thanks very much, 73 Adrian.
@vk6cs4567 жыл бұрын
When I tune around I have my tuner in bypass mode because peaking it on one frequency will put attenuation in on others... especially if they are MHz away. In bypass mode it's a lot like connecting the antenna directly to the radio. LW and MW would be ok but there is stray capacitance in HF tuners that may adversely affect VHF and UHF signals. It wouldn't hurt to just try it.
@ado756 жыл бұрын
Just want to thank you again for these tuner vids, and all your other output. I sat my exam there before Christmas (we only have one class here - all or nothin'!) . Your videos were of great help and added to my understanding of theory elements etc. So thanks again. 73 Adrian EI9HAB
@eljaguar100007 жыл бұрын
Best regards from Venezuela. Excellent equipment to tone our antennas What is the price of youkits fg-01 Jorge yy4gor
@vk6cs4567 жыл бұрын
Hi Jorge. Thanks for the comment... I believe the unit was about 400 Australian dollars.
@blmkrdave2 жыл бұрын
I wish you could have tuned without that contraption on the right, I doubt most people have one of those things. I am always refining my HF signal on a screwdriver which takes considerable time with every frequency change.
@shartne7 жыл бұрын
I was wanting to purhase this but I dont understand where to put the balancing wires? Do they go on the antenna or what? I dont want to hack into my jpole.
@vk6cs4567 жыл бұрын
This is designed for feeding coax, it's designed for tweaking mobile whip antennas. It does have the tuning range to match wire antennas that are quite long though. If you want to connect it to a balanced feeder you'll have to put a balun on the output. Something like this: www.ebay.com.au/itm/MFJ-911-4-1-Balun-UnBal-300-Watts-/111802128383?hash=item1a07ed17ff:g:uY4AAOSwQTVV-JVZ Then just have a coax lead to connect the antenna port on the tuner to the coax input of the balun. You would probably be better off getting a tuner with a balanced output.
@RossDuClair7 жыл бұрын
WD4ED is quite correct. A tuner, or any tuned input or antenna for that matter, is matched with either capacitive reactance or inductive reactance assuming that the feed point is not 50+/-J0. The efficiency of the radiator (antenna) is a function of the ratio of forward to reflected. But, we all know that. So an antenna tuner matches the output of the RF output to look perfect to the transmitter. So, the VSWR meter on the tuner shows the result of that match. However, the tuner is not adding to the efficiency of the antenna. As to another question: where is the loss in RF going? Well, back into the antenna tuner. The reflected power has to go somewhere. Do antenna tuners get hot? You bet and so do tuned stubs. 73 WA6VWY
@vk6cs4567 жыл бұрын
I think his point related to the efficiency of the match the 'tuner' is providing. Not the efficiency of the antenna.
@JohnGuillorykf5qeo7 жыл бұрын
just curious, but what would bypassing the antennae tuner be, minimum capacitance & minimum inductance?
@vk6cs4567 жыл бұрын
No, the only way to bypass the tuner is to press the 'bypass' switch or take the tuner out of circuit. The bypass switch is the top one of the three to the right of the meters. All commercial ATUs have a bypass switch, the auto-ATUs will bypass if you remove power to them.
@madani339 жыл бұрын
Thank you 73. HZ1DF
@vk6cs4568 жыл бұрын
+jop madani Thank you for taking the time to post the feedback.
@ralph99873 жыл бұрын
That "smidge" is 10 % . 10w @100w and 100w @1kw, so not really something to ignore.
@watchfan61805 жыл бұрын
Nice Rolex
@AdrianHiggins835 жыл бұрын
so how to tune up with a radio without transmitting, do you use a tee into a dummy load? can you show.
@vk6cs4564 жыл бұрын
No T piece. Take the coax out of the radio and connect it to the antenna analyser. Set the frequency of interest on the antenna analyser and adjust the controls on the ATU for a good 50 Ohm match. Then take the coax off the analyser and connect it to the radio.
@masterewoks81214 жыл бұрын
Can you do a video how to tune it if you don't have an analyzer?
@vk6cs4564 жыл бұрын
Thanks for the suggestion. I'll do that.
@Wyowanderer8 жыл бұрын
How are these instruments connected together?
@vk6cs4568 жыл бұрын
The antenna port on the ATU is connected to the antenna, the antenna analyser is connected to the TX port on the ATU. So when the ATU has been tuned for a match the lead on the ATU TX port is taken off the analyser and connected to the radio.
@timdbl7804 Жыл бұрын
I guess the power measurement will be less accurate if running into a mis-match?
@jcharos76727 жыл бұрын
The second tuning was like watching paint dry.
@vk6cs4567 жыл бұрын
I've never tried that. Thanks for the feedback.
@farmerwayne14042 ай бұрын
The mfj manual says to do it the first way. Ty
@depluribusunum31284 жыл бұрын
Why don't you start at 3/4 Max cap.
@johninjersey3 жыл бұрын
L is the maximum inductance. A is the minimum inductance. Check a schematic
@docpearson Жыл бұрын
Maybe it’s my fuzzy iPhone, but did anyone actually see the needle move?
@dreupen3 жыл бұрын
Am I the only one who noticed your mistake with method 2? Rather than starting at max capacitance, you started at min capacitance. It no wonder why you could not lower the swr, it need lower capacitance. That said, I agree the recommended method is better.
@dougtaylor77243 жыл бұрын
I change bands way to much for method two.
@rohnkd4hct2602 жыл бұрын
I have that meter and the first method is the way I always did it. The other way is OK, but not worth the time.
@jack002tuber7 жыл бұрын
ATU? Is that an antenna tuner?
@vk6cs4567 жыл бұрын
Yes, ATU = Antenna Tuning Unit. Antenna matching unit is a more accurate description as they don't actually 'tune' the antenna, they just transform the mismatch impedance to 50 Ohms to keep the radio happy.
@jack002tuber7 жыл бұрын
Match impedance, got it. I understood the idea, never heard the acronym. Thanks.
@bruceblosser384 Жыл бұрын
Any time you go below the ZERO, or past the 10, you are using the same amount of capacitance that you would be using, about 90 degrees in the other direction!!! Don't believe me? Take the damn cover off! :)
@daveycrockett645 жыл бұрын
If you are transmitting 1W from a rig capable of transmitting more than a watt, then there is some sort of control loop inside the rig keeping the power at 1W. A couple of methods of doing this are to monitor the current in the PA or detect some of the forward power using a directional coupler. In any case the assumption of the designers will have been that the transmitter will be working into the nominal impedance i.e. 50 ohms, and all the development work of the power control loop will have been done into a 50 ohm load. If you mismatch it, the power control loop will move to a different point. It may produce more power, it could be be less power - nobody knows because you have moved to a condition where the behaviour is not specified. All you are doing is looking at the behaviour of this control loop under the changed conditions, and you have not proved anything general at all.
@hubzcaps4 жыл бұрын
Subbd
@thogevoll Жыл бұрын
Method 2 was a waste. You got about 50mW more forward power. To get one more s unit at the receiving end you'd have to have 6dB more power. That means going from one watt up to four watts.
@Species-rj9si6 жыл бұрын
You called it a "Manual ATU." "ATU" stands for "AUTOMATIC" antenna tuner." A "manual ATU" would be a "Manual Automatic Antenna Tuner." Say what???
@modex206 жыл бұрын
Antenna Tuning Unit
@allsortsabouteverything5 жыл бұрын
ATU actually stands for Antenna Tuning Unit. The correct acronym for the automatic version is an aATU.
@bigsky19705 жыл бұрын
ATU = Antenna Tuning Unit
@mattcero16 жыл бұрын
You could not go any slower if you tried guy.
@vk6cs4566 жыл бұрын
Oh, I'm sure I could... quite easily.
@user-dt7zx1kd8jАй бұрын
you were very helpful, you took your time, talk slowly, pointed out details, really made scense..very helpful..newbe KD9ZWT