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ATU-1000 SWR Bridge adjustment question

Bj?rn Pasteuning - PD5DJ
 

Hi all.

I Have purchased a ATU-1000 kit.
Does anyone know or have a good source where i can find instructions how to adjust/calibrate the swr bridge with the 2 potentiometers?

73


Bj?rn de PD5DJ

Op wo 15 jun. 2022 12:13 schreef ZAO via <zao=[email protected]>:

Dear Glenn,

The longest keypress brings it into a power-down mode, the unit does not react on anything but the next longest keypress.
No RF-power will wake it up from there.
It is only the 30-minutes iddling time, when just the OLED is off, that the unit keeps monitoring the RF-power and may re-tune if necessary. Any keypress or RF-conditions change resets this 30-minutes timer anew.

Warm regards,
Tony

 

Get a wattmeter and dummy load. Feed power thru the tuner in the FWD direction and set the pot to give you the same power the wattmeter says it is. Now switch the in and out of the tuner and do the same except this time you're adjusting the reflected power pot. All done.

Depending on the kit, you may find the two diodes aren't worth beans and you'll want to replace them with good ones.

Vince - K8ZW.

On 06/15/2022 07:48 AM, Bj?rn Pasteuning - PD5DJ wrote:
Hi all.

I Have purchased a ATU-1000 kit.
Does anyone know or have a good source where i can find instructions how
to adjust/calibrate the swr bridge with the 2 potentiometers?

73


Bj?rn de PD5DJ

Op wo 15 jun. 2022 12:13 schreef ZAO via groups.io <>
<zao@... <mailto:[email protected]>>:

Dear Glenn,

The longest keypress brings it into a power-down mode, the unit does
not react on anything but the next longest keypress.
No RF-power will wake it up from there.
It is only the 30-minutes iddling time, when just the OLED is off,
that the unit keeps monitoring the RF-power and may re-tune if
necessary. Any keypress or RF-conditions change resets this
30-minutes timer anew.

Warm regards,
Tony

--
Michigan VHF Corporation -- nobucks dot net

K8ZW -

Bj?rn Pasteuning - PD5DJ
 

Thanks, I figured this should be the way.

Will have a go today :-)
Bj?rn Pasteuning - PD5DJ
 

I have performed a "calibration" but I think it is harder then suggested.

There are some factors playing in the ATU-1000 Situation.

1. When setting eeprom address 30 to 01, to activate highpower readout.

The tuner wont tune in Tune mode.

Settings this back to 00, low power readout,, tune works.

?

2. Eeprom address 31,How do I interpret the 20winding tandem bridge?

?

I have wound the bridge like I always do, inductor CCW, and the other CW.

Calibrating Power, I can follow?Vince - K8ZW procedure.. although when swapping the connectors, I have no power readout.

?

For SWR when having a 50ohm load.. reflected voltage is "zero", the ratio of voltage output of the 2 potentio meters have to be very very acurate.

?

I gues I have to calibrate the SWR bridget with 75/100/150ohm loads too.

?

Any advice on this?
 

Hello,
?
How are you doing?
?
I was not able to get any reading from your method when swapping the input with output in order to calibrate SWR.
?
What other method can I use to calibrate the ATU-1000 SWR kit??

I have 3.2 firmware already flashed by the manufacturer, also .96 oled display was provided in the kit.

I reckon it works, when I play back and forward with the SWR variable resistor , the tuner starts a tuning cycle untill it thinks its tuned.
?
Cheers and thanks in advance,
?
Luis CT2FZI
 

¿ªÔÆÌåÓý

Hi Luis,


Read this thread: /g/ATU100/topic/104260313

also read the manual on github


---
Cu ganduri bune,
Marius ¨C YO6RK
senty.ro
73!


-------- Original Message --------

Subject: Re: [ATU100] ATU-1000 SWR Bridge adjustment question
Date: 09.10.2024 12:32
From: "CT2FZI" <ct2fzi@...>
To: [email protected]


Hello,
?
How are you doing?
?
I was not able to get any reading from your method when swapping the input with output in order to calibrate SWR.
?
What other method can I use to calibrate the ATU-1000 SWR kit??

I have 3.2 firmware already flashed by the manufacturer, also .96 oled display was provided in the kit.

I reckon it works, when I play back and forward with the SWR variable resistor , the tuner starts a tuning cycle untill it thinks its tuned.
?
Cheers and thanks in advance,
?
Luis CT2FZI
 

Hello everyone,
?
Just so you know...
?
I have used a manual antenna tuner with a 50 ohms load connected at the antenna port.
?
With a VNA, using both inductance and capacitance from the manual ATU, I configured it to get SWR 2.7:1 .
?
Then, by means of TX, I was able to adjust the SWR accordingly using the potentiometre in the ATU-1000.
?
Profit :)
?
?
?

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