Hi Arron.

So the TUNE button is used when the ATU/100 is in the NonAUTO mode to set it to tune your Setup for your radio. Press this till the TUNE shows on the display, then key the mic and send a signal to get the tuner to work.

The AUTO button switched between AUTO and NonAUTO. When in AUTO mode Keying the mic and sending a signal makes the ATU/100 tune automatically IF the setup is not already in tune. this can happen often if your setup is not stable, or you are using a big band, as the SWR will change as you go from one end of the band to the other.

The BYP button bypasses the ATU/100 so it will not tune at all. For use when you have a tuned antenna fitted.?

I'm sure others will offer more in depth help here, but hope this helps a little

Vaughn

Hey guys, I have a ATU-100 EXT tuner. For it to work automatically it needs to be in SWR=TUNE? Or do I need to press the TUNE button whenever i change frequency??
I have 3 buttong on the front of the tuner:
TUNE
AUTO
BYP

Just trying to figure out what does what

Hi, Bill
The ATU 10 does not have dedicated circuit to do a bypass, but when it is reseted, all inductances are shorted and all the capacitances are disconnected? . It is equal to short in and out. Trough tandem match, of course.?
Take a look on the schematic for this understanding.

hi Bill,?
the tuner tunes in line before your MFJ. So the MFJ is part of the antenne system to tune. Your TX sees a matched line your MFJ sees an unmatched antenna..,
73,
Immo

Hello, David;

Everyone's responses are greatly appreciated. However, Unfortunately, I am finding them conflicting and hence confusing. Let me make sure I have this correct.

Talking about the ATU10 (NOT the ATU100): If I hit reset, and then immediately turn the unit off, It will essentially be in a by-pass mode? Input shorted to output? Is that correct?

If this is so, then the ATU10 DOES have a by-pass mode. This would explain why, when I have the equipment set up in the order of: xcvr then ATU10 then MFJ then ant configuration, and I turn off the ATU10, I still get normal power and swr readings on the MFJ, yes?

With ATU10 on and working, after hitting reset and putting it in tune mode, at for example 7.150Mhz,, AUT10 gives me 1.5 swr @ 1.4w, while the MFJ is reading 4.0-4.5 swr @ 2.5w. I am not sure how to reconcile these diverse readings?

Then, following your though if I am clear, after I reset/off the ATU10, the MFJ gives swr 4.0 @ 3w.; a small difference. Is this significant?

Thoughts?

Thanks David,
Was hoping for maybe it reading the LC differently.

Immo, very cool thank you for the information.
Jim 73

Hi. Atu 100 is using 2 lines display
https://www.ebay.com/itm/185777139951?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=h3mgHm5rRni&sssrc=4429486&ssuid=MqXhebTIQBu&var=&widget_ver=artemis&media=COPY

hi Jim
if you think of OLED-display like used at the most chinese parts:
take? this:
OLED-128O064D-BPP3N00000 from i.E. Vishay (data sheet appended)
Uses a SSD1306BZ -controller.



and looks like this from behind:

Hope you'll find yours. Are available in blue and white .

73
Immo

Hi, Bill
You can put the ATU10 into reset and switch it off.
Only if you have to pass tru 100w it is necessary to disconnect it physically. Better use cheap antenna switches.?
Each swr/per will show some different data, it is normally. I would trust my oscilloscope.

Hi all, looking for the part number for the atu-100 with? 4 line display (original).
Thanks, Jim W?JRN? 73

Hello, David;

I have a uSDX going to an MFJ-872 swr/pwr meter to the ATU-10 to the antenna. I use the MFJ because I like to confirm the accuracy of the AUT10 swr and power readings. I find some significant differences. Good question is which do you trust more?

As I play with diff antennas, I need to test the swr across several points on several bands. Rather than having to disconnect the ATU10 each time, I thought it would be easier to just turn it off and throw the by-pass switch,

Would you put the MFJ before the ATU10 closest to the transmitter, or after the ATU10 closest to the antenna? And why?

Thoughts?

Hi, Bill
Just click reset on the tuner and in/out are shorted.
I did not see any reason to short it again. Can you explain why ?

can nobody answer this last one?.

Bill WA2WIO
11:22am #2651

Is there any reason I could not install a small DPDT manual switch (push button perhaps) to simply move the in/out jack connections from normal to shorted?

I this is an acceptable, old school, solution, it brings up HF RF Switch requirements. Are there any special switch specs to adhere to? Any one have a part number/source for a simple small DPDT PB switch I could add to the unit?

Is there any reason I could not install a small DPDT manual switch (push button perhaps) to simply move the in/out jack connections from normal to shorted?

I this is an acceptable, old school, solution, it brings up HF RF Switch requirements. Are there any special switch specs to adhere to? Any one have a part number/source for a simple small DPDT PB switch I could add to the unit?

Thank you
Bill, WA2WIO

开云体育