AT-100M Pro - An Upgraded Antenna Tuner Covering 1.8 to 30 MHz

Here we take a look at the AT-100M Pro, an upgraded automatic antenna tuner with internal battery for portable or home use.
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[@johnnorth9355]

I have used the M version for a couple of years on my 10 meter setup. Very pleased and see no reason to upgrade.

[@vk4foo]

Very happy with the AT-100M, used it for the past 6 mths 40 through to 10 with no probs running 20 to 45 watts FT8. Great reviews mate, from an Alian in Asia - VK4 F👀 was Here. currently Yeoju-si ROK portable

[@jamescstanley5018]

At less than 90 quid, this seems to be a good buy for the QRP guys and those lmited to 50 watts by their ticket! When starting out there is a lot to learn and not having to worry about a tuner is a great plus, it also saves money with the SWR meter built in, so that is another bit of kit and co ax lead not needed.As I am on a resonant DX Commander, I will not be buying one for the moment, but I will in the future as funds permit, mainly for going portable with an EFHW. Thanks for the video. 73 Jim M7BXT

[@raymondmartin6737]

I have the older ATM-100, with my Yaesu FT-818ND, and a Micro 50 watt amplifier. It handles higher SWR, than the 3:1 SWR, the FC-50 tuner does with my Yaesu FT-891.. The biggest problem in using the aforementioned 3 items together is that the Micro 50 watt amp must be under 2:1 SWR with the older ATM-100, first being under 2:1 SWR so the Micro 50 watt amp will work. It is a bit cumbersome set up this way, but I think it depends on how resonant the antenna used is to begin with. My multiband Windcamp, WA4, OCF antenna is a compromise, being 60 feet and 20 feet on each leg, limited by my being in an apartment on the terrace. 😊 73 de W2CH Ray New Hampshire.😊

[@davepickering997]

I was looking for a fully auto-tune ATU to incorporate in a home - brew HT Transceiver project This seems better than the standard clone ATU-100 which I already have. Ali's price is a lot cheaper too. Thanks for the review Mat

[@raymondmartin6737]

Yes, when I tried using the ATM-100 original unit with my Yaesu FT-891, such as on 10 meters, the ATM-100 went crazy and would not work well at transmitting 100 watts, as you stated near the end of your video. That's why I purchased the Yaesu FC-50 auto tuner for the FT-891, being more suitable for a full powered transceiver. I think that ATM-100, and likewise the ATM-100 pro are more suited for lower power, 50 watts or less, as I have found using it with the FT-818ND, and the Micro 50 watt amplifier. I saw the new ATM-100 Pro listed on import for about US $100.00. Thanks again for your review. 😅 73 de W2CH Ray New Hampshire.

[@antuner]

Hi, the frequency range supported by AT-100M is 1.8-30Mhz, and the maximum power support is around 50W at>18Mhz. Due to its very small size, it can interfere with internal circuits at high power. At the same time, the support for maximum transmission power is also related to your antenna.

[@ekendraedrisinghe3428]

@@antuner Quick question... if the power is accidentally increased to 100w (SSB)on frequencies above 18Mhz, will it damage the AT-110M Pro? 4S7EF

[@antuner]

It will not damage the antenna. When you continue to increase the power, as long as the relay is not disturbed (automatic abnormal noise and pull-in operation during transmission), and the VSWR remains normal, then you can continue to increase the power. AT100M/Pro is actually Withstands 200W single sideband.@@ekendraedrisinghe3428

[@pieterdutoit9642]

Hell MAN DID NOT KNOW IT WAS COMEING i JUST ORDER MY ATM- 100M !!!!! had i have known, Pieter

[@Kinetic79]

As it's relatively in beta stage for the Pro, it may have some need for firmware upgrades (that require kit you likely do not have on hand) ... so the AT-100m is going to be more tried and tested. As I mentioned in another comment here, it's not clear what impact the greater range may do (or have done) to the granularity of tuning (inductance and capacitance steps)... and also if the minimum inductance and capacitance levels were retained from the AT-100m to the Pro. There are likely situations where the AT-100m (non Pro) is more efficient than the Pro version, methinks.

[@ralph9987]

Nice unit. What was the swr range, I missed that.

[@truhartwood3170]

I think I'll stick to the AH-705, as I'm only doing local comms and don't need more than 10W. The AH-705 is somewhat weather-proofed and many to be used remotely, so it can be located at the feedpoint of the antenna and is made to be connected to an EFRW directly with no unun so is pretty efficient in that setup.

[@Kinetic79]

I have the AT-100m (non-pro), and it seems like a good unit. I don't have a lot of experience with other tuners outside of the in-built tuner in many transceivers, but it clearly has a wider matching range than many of those. I tried it recently with a 300ohmn twin lead fed doublet (44' broadband doublet for 40m-10m, esp. for use on 20m and below;; and links to extend it to just over 55', which is a recommendation from DX engineering for a non-resonate multi-band doublet for 40m and below with approx 15ft * odd multiples of feed line;; all into a switchable 1:1 and 4:1 choke). I was able to get tunes, but noticed that there was a very low input impedance (R) on most of the frequencies... so while sometimes the 4:1 helped to bring in the SWR by apparently bringing in the reactance as well as reducing the input impedance, that would have resulted in even low input impedences (e.g., 5-10ohms). Those are said to be very difficult for the typical tuner to deal with efficiently, even if a match is achieved. My rough understanding is that added inductance is often more lossy than added capacitance. So I'm kind of wondering if there is any way to tell how this Pro version deals with low impedance situations, as compared to the original? The minimum inductance and capacitance levels are not specified on the devices, nor are the steps available. You kind of have to wonder if the added range creates bigger steps (presumably, yes, because only 1 additional set of relays is present on the Pro), and thus potentially less efficient or more challenging matches. I realize this is a little outside of the scope of the 'show and tell' video, but maybe someone has some insight :)

[@antuner]

AT-100M Pro adds capacitance and inductance, it can zoom more than AT-100M at the frequency of impedance impedance, v1.23.8a version re-optimizes the zoom algorithm, you will find that the zoom time is minimal because of the time increase, and you can get A good SWR, but in theory adding a set of relays does increase the time, and the increased time is

[@ekendraedrisinghe3428]

Any idea what the SWR range the unit can handle? 4S7EF

[@Kinetic79]

@@ekendraedrisinghe3428 While not a technical response-the non-pro version has something along the lines of a 10:1 range. Definitely more range than an internal touch-up antenna tuner in a modern rig. Because SWR reading by itself doesn’t speak to the complex aspects of the impedance that the tuner is seeing, it’s difficult to characterize the range in terms of SWR. I’m sure there is some scenarios where it won’t match a < 10:1 SWR reading, and certainly scenarios where it will indeed match a > 10:1 reading. But from my experimentation, I *think* you can expect similar tuning range to other ~10:1 tuners.

[@adrianofcarvalho5078]

Hello! The older tuner antennas have the bay pass function, does the Atu-100M Pro also have bay pass? Thank you if you clear this doubt!!!

[@ianliston-smith7921]

What is the lowest power input it needs to find a reliable match?

[@M9A1MAN]

Nice

[@Philip-KA4KOE]

Does it have latching relays?

[@duanecjohnson]

The CW feature is essentially for free as the micro has nothing else to do and takes up little to no computing while not on duty doing tunning. Why not? ADOTJ

[@DavidCase-ov5uo]

The cw gen would be useful if you could key it with the same key operating the TX Not all home brew rigs have sidetone built in. A simple logic cct could deal with this. 73 Dave G4BTI.

[@timbookedtwo2375]

Can the battery be replaced? Are replacements available? On Aliexpress there are many offerings for this ATU from different manufacturers/sellers. There is also a large span of prices. They even use the same pictures. What is a reliable (original) manufacturer/seller? I would hate to throw a hundred euros away on trash.

[@m4v3r1kpl]

Anyone here have a problem with internal noise from AT-100M Pro when working on internal battery? When it is working from powerbank it is quiet. When on internal battery and not tuned, it is quiet. When on internal battery and tuned it is noisy as hell - S5 of noise. Anyone have this kind of issue?

[@BigJohnsHamShack]

I have one ordered, well pre-ordered. Will not be here until mid-December. The CW "practice" function is of no value to me and would have preferred something else or nothing additional at all.

[@anderse9802]

Will it keep the tuning value if turned off? (to save battery when operating for a extended time on the same frequency)

[@nickbarber48]

I’d like to know this as well

[@Kinetic79]

no, the unit must be powered to remain tuned. they are not matching relays. The battery does last long enough for a portable operating session, though-possibly even enough for a weekend camping trip, depending on how much tuning you are doing.

[@NorthernLights1]

@@Kinetic79 Thanks for the info! 👍

[@CAMintmier]

Is it just me, or does anyone else think that one button functionality is horrible? It would probably be a lot easier to use with either a rotary push button knob, or even separate up, down, and enter buttons.

[@stanholmes4293]

Can you provide a link to purchase from reputable dealer. Thanks

[@TechMindsOfficial]

I only link reputable sellers in the description of my videos. Cheers

[@davidhay45]

This unit has eight inductors and eight capacitors instead of seven in the non pro version!

[@iso1879]

Can anyone verify if this unit works with 50MHz? Chinese sites claim it can, even though it is marked 1.8-30MHz.

[@R1CBU]

Do they still install regular relays and not polarized ones? When powered by a built-in battery, this is not reasonable. 73!

[@Kinetic79]

non-latching relays. it’s best for portable ops situations, I think.

[@R1CBU]

@@Kinetic79 This is illogical. For portable systems, polarized relays are more suitable because they consume less energy. Those. They consume only at the time of tuning, during operation they do not consume at all.

[@Kinetic79]

@@R1CBUthey are desirable, of course, but not present in this version. This is most suitable to somebody who wants to experiment in the field, not necessarily park on some frequencies for hours at a time. So get a different device that suits you better. A manual tuner will take no power at all. :) Just because you think it doesn’t suit you, it doesn’t make it a bad choice for somebody else. It’s a value proposition item with lower price point and high portability. The designer is well aware of the implications of his choice, and now-in part thanks to my confirmation to you-you are, too.

[@KD9VUK-]

My original AT-100M has a bad battery, that self discharges like crazy

[@TechMindsOfficial]

There was one model that had the battery permanently connected and would drain the battery. Looks like this one totally disconnects the battery when switched off.

[@tonyntrisha]

It's mince. Bought one 2 months ago and it's gubbed already. Randomly cuts out even if it has a fully charged battery or connected to an external one. Cheap for a reason. Avoid.

[@badcompany3828]

People want to see the tuner right away. Not sit and look at paperwork for 5 minutes. Thumbs down 👎 for this video.