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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[johnnorth]

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

[vkfoo]

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

[jamescstanley]

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

[raymondmartin]

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.

[pieterdutoit]

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

[raymondmartin]

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.😊

[truhartwood]

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.

[electechyt]

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

[adrianofcarvalho]

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!!!

[Kinetic]

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 :)

[X-RADIO]

Just received the AT-100M Pro
On the Rear is what looks like an LED, should this illuminate when charging.?
Many Thanks

[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.

[ralph]

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

[ianliston-smith]

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

[timbookedtwo]

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.

[anderse]

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

[stanholmes]

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

[mvrkpl]

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?

[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-ovuo]

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.