Hello
According to the photos, a Stockton bridge must be replaced to bigger core , everything else should to hold 150W
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Hello,
?
I have an ATU-100 and am happy with the operation. I like to derate my tuners so I will run a max of 80 watts SSB with my ATU-100.
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I saw this ATU-130:
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It states it is a 150 watt tuner. Has anyone used it or have any opinions on this unit? Does it use the same processor as the AT-100? I would be running a maximum of 100 watts SSB or CW with this tuner?
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Any feedback is appreciated? I'd like to order it from PRIME so that I can return it. Does anyone recommend any other PRIME store?
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73,
?
Mike N2MS
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Re: looking for the atu-100ext schem
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looking for the atu-100ext schem
where can i find it,github says file unavailable!.
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Re: ATU100M fail at start?
Hello David, thanks very muy for your indications, I installed a 2k7 resistor and the problem is solved!
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Not following, Robbie. I do that regularly but the amp trips anyway because the ATU is mismatching the input impedance. I'll try Mike N2MS attenuator solution.
Do you have any attenuators to suggest?
My KPATU 500 will do the same thing. I avoid this by driving the amp with 5 watts on FM /AM / RITTY? then when it’s happy turn up the power as much as I need to.
You just need to find what your combination likes.
Best regards, Robbie
> On 6 Mar 2025, at 22:36, Mike N2MS via <mstangelo=[email protected]> wrote:
>
> ?My mistake. Still the attenuator may help.
>
> Mike N2MS
>> On 03/06/2025 3:32 PM EST Bruce Wolfe N6BMW <n6bmw@...> wrote:
>>
>>
>> It's the Flexradio that has the issue, not IC-7300.
>>
>>
>>> On Thu, Mar 6, 2025, 10:32?AM Mike N2MS via () <mstangelo=[email protected]> wrote:
>>> Bruce,
>>>
>>> It sounds like the input impedance to your amplifier is not 50 ohms and the 7300 does not like it. I would try a 1dB attenuator circuit between the 7300 and amp. it will drop your power about 10 watts but your amplifier probably does not require 100 watts for full output.
>>>
>>> Mike N2MS
>>>
>>>> On 03/06/2025 10:44 AM EST Bruce Wolfe N6BMW <n6bmw@...> wrote:
>>>>
>>>>
>>>> Thanks for getting back to me.
>>>>
>>>> Mike N2MS, not sure how that helps me. Sure, I have the amp in bypass mode when matching SWR. The issue is the rig's SWR goes up to the threshold after I take the amp off bypass.
>>>>
>>>> I'm wondering if there is some buffer or filter I can put between the rig and amp.?
>>>>
>>>> Also when tuning, a solid carrier is needed but the rig does RF spike above the set output using SSB. ID hate to have to go back to ALC control but I don't think that will fix it.
>>>>
>>>> Nonetheless, I put my IC-7300 back into this system with the roller tuner and absolutely no issue and can drive the input up to 12w making the amp work the it's supposed to.
>>>>
>>>> Have to do more troubleshooting with the ATU500w
>>>>
>>>>
>>>>
>>>>
>>>> On Wed, Mar 5, 2025, 7:22?AM Mike N2MS via () () <mstangelo=[email protected]> wrote:
>>>>> Have you tried matching with just your rig with the amplifier bypassed then turning on the amp?
>>>>>
>>>>> I also find my tuners have trouble matching on 40 meters when switching from another band. If I power cycle the tuner it does fond a match on 40 meters.
>>>>>
>>>>> Mike N2MS
>>>>>
>>>>>> On 03/05/2025 2:48 AM EST G0DDX via () () <g0ddx=[email protected]> wrote:
>>>>>>
>>>>>>
>>>>>> I have the same issue with my Aliexpress supplied 1kw N7DDC auto atu, which works well. As far as I can see, as it tunes, it goes thru L&C combinations that ARE a big mismatch before getting to a tuned combination of L&C, thus tripping the amp. I have built a W6PQL 1kw amp with both protection bridges in it and it trips out with the N7DDC atu. Not sure how to over come it. With a manual ATU at least you can tune on rx for best noise before applying power.
>>>>>> I think that's what's happening, but willing to be proved wrong. I also think this will be the case for any auto atu that does not have "feedback controls" etc. My Elecraft Auto atu works perfectly, but then it has full control connecting the K3, KPA500, and CAT500. Bottom line is to use resonant antennas!
>>>>>> Geoff
>>>>>> G0DDX
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>
>
>
>
>
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My KPATU 500 will do the same thing. I avoid this by driving the amp with 5 watts on FM /AM / RITTY then when it’s happy turn up the power as much as I need to.
You just need to find what your combination likes.
Best regards, Robbie
toggle quoted message
Show quoted text
On 6 Mar 2025, at 22:36, Mike N2MS via groups.io <mstangelo@...> wrote:
?My mistake. Still the attenuator may help.
Mike N2MS
On 03/06/2025 3:32 PM EST Bruce Wolfe N6BMW <n6bmw@...> wrote:
It's the Flexradio that has the issue, not IC-7300.
On Thu, Mar 6, 2025, 10:32?AM Mike N2MS via groups.io () <mstangelo@...> wrote:
Bruce,
It sounds like the input impedance to your amplifier is not 50 ohms and the 7300 does not like it. I would try a 1dB attenuator circuit between the 7300 and amp. it will drop your power about 10 watts but your amplifier probably does not require 100 watts for full output.
Mike N2MS
On 03/06/2025 10:44 AM EST Bruce Wolfe N6BMW <n6bmw@...> wrote:
Thanks for getting back to me.
Mike N2MS, not sure how that helps me. Sure, I have the amp in bypass mode when matching SWR. The issue is the rig's SWR goes up to the threshold after I take the amp off bypass.
I'm wondering if there is some buffer or filter I can put between the rig and amp.?
Also when tuning, a solid carrier is needed but the rig does RF spike above the set output using SSB. ID hate to have to go back to ALC control but I don't think that will fix it.
Nonetheless, I put my IC-7300 back into this system with the roller tuner and absolutely no issue and can drive the input up to 12w making the amp work the it's supposed to.
Have to do more troubleshooting with the ATU500w
On Wed, Mar 5, 2025, 7:22?AM Mike N2MS via groups.io () () <mstangelo@...> wrote:
Have you tried matching with just your rig with the amplifier bypassed then turning on the amp?
I also find my tuners have trouble matching on 40 meters when switching from another band. If I power cycle the tuner it does fond a match on 40 meters.
Mike N2MS
On 03/05/2025 2:48 AM EST G0DDX via groups.io () () <g0ddx@...> wrote:
I have the same issue with my Aliexpress supplied 1kw N7DDC auto atu, which works well. As far as I can see, as it tunes, it goes thru L&C combinations that ARE a big mismatch before getting to a tuned combination of L&C, thus tripping the amp. I have built a W6PQL 1kw amp with both protection bridges in it and it trips out with the N7DDC atu. Not sure how to over come it. With a manual ATU at least you can tune on rx for best noise before applying power.
I think that's what's happening, but willing to be proved wrong. I also think this will be the case for any auto atu that does not have "feedback controls" etc. My Elecraft Auto atu works perfectly, but then it has full control connecting the K3, KPA500, and CAT500. Bottom line is to use resonant antennas!
Geoff
G0DDX
|
My mistake. Still the attenuator may help.
Mike N2MS
toggle quoted message
Show quoted text
On 03/06/2025 3:32 PM EST Bruce Wolfe N6BMW <n6bmw@...> wrote:
It's the Flexradio that has the issue, not IC-7300.
On Thu, Mar 6, 2025, 10:32?AM Mike N2MS via groups.io () <mstangelo@...> wrote:
Bruce,
It sounds like the input impedance to your amplifier is not 50 ohms and the 7300 does not like it. I would try a 1dB attenuator circuit between the 7300 and amp. it will drop your power about 10 watts but your amplifier probably does not require 100 watts for full output.
Mike N2MS
> On 03/06/2025 10:44 AM EST Bruce Wolfe N6BMW <n6bmw@...> wrote:
>
>
> Thanks for getting back to me.
>
> Mike N2MS, not sure how that helps me. Sure, I have the amp in bypass mode when matching SWR. The issue is the rig's SWR goes up to the threshold after I take the amp off bypass.
>
> I'm wondering if there is some buffer or filter I can put between the rig and amp.?
>
> Also when tuning, a solid carrier is needed but the rig does RF spike above the set output using SSB. ID hate to have to go back to ALC control but I don't think that will fix it.
>
> Nonetheless, I put my IC-7300 back into this system with the roller tuner and absolutely no issue and can drive the input up to 12w making the amp work the it's supposed to.
>
> Have to do more troubleshooting with the ATU500w
>
>
>
>
> On Wed, Mar 5, 2025, 7:22?AM Mike N2MS via groups.io () () <mstangelo@...> wrote:
> > Have you tried matching with just your rig with the amplifier bypassed then turning on the amp?
> >
> > I also find my tuners have trouble matching on 40 meters when switching from another band. If I power cycle the tuner it does fond a match on 40 meters.
> >
> > Mike N2MS
> >
> > > On 03/05/2025 2:48 AM EST G0DDX via groups.io () () <g0ddx@...> wrote:
> > >
> > >
> > > I have the same issue with my Aliexpress supplied 1kw N7DDC auto atu, which works well. As far as I can see, as it tunes, it goes thru L&C combinations that ARE a big mismatch before getting to a tuned combination of L&C, thus tripping the amp. I have built a W6PQL 1kw amp with both protection bridges in it and it trips out with the N7DDC atu. Not sure how to over come it. With a manual ATU at least you can tune on rx for best noise before applying power.
> > > I think that's what's happening, but willing to be proved wrong. I also think this will be the case for any auto atu that does not have "feedback controls" etc. My Elecraft Auto atu works perfectly, but then it has full control connecting the K3, KPA500, and CAT500. Bottom line is to use resonant antennas!
> > > Geoff
> > > G0DDX
> >
> >
> >
> >
> >
> >
>
|
It's the Flexradio that has the issue, not IC-7300.
Bruce,
It sounds like the input impedance to your amplifier is not 50 ohms and the 7300 does not like it. I would try a 1dB attenuator circuit between the 7300 and amp. it will drop your power about 10 watts but your amplifier probably does not require 100 watts for full output.
Mike N2MS
> On 03/06/2025 10:44 AM EST Bruce Wolfe N6BMW <n6bmw@...> wrote:
>
>
> Thanks for getting back to me.
>
> Mike N2MS, not sure how that helps me. Sure, I have the amp in bypass mode when matching SWR. The issue is the rig's SWR goes up to the threshold after I take the amp off bypass.
>
> I'm wondering if there is some buffer or filter I can put between the rig and amp.?
>
> Also when tuning, a solid carrier is needed but the rig does RF spike above the set output using SSB. ID hate to have to go back to ALC control but I don't think that will fix it.
>
> Nonetheless, I put my IC-7300 back into this system with the roller tuner and absolutely no issue and can drive the input up to 12w making the amp work the it's supposed to.
>
> Have to do more troubleshooting with the ATU500w
>
>
>
>
> On Wed, Mar 5, 2025, 7:22?AM Mike N2MS via () <mstangelo=[email protected]> wrote:
> > Have you tried matching with just your rig with the amplifier bypassed then turning on the amp?
> >?
> >? I also find my tuners have trouble matching on 40 meters when switching from another band. If I power cycle the tuner it does fond a match on 40 meters.
> >?
> >? Mike N2MS
> >?
> >? > On 03/05/2025 2:48 AM EST G0DDX via () <g0ddx=[email protected]> wrote:
> >? >
> >? >
> >? > I have the same issue with my Aliexpress supplied 1kw N7DDC auto atu, which works well. As far as I can see, as it tunes, it goes thru L&C combinations that ARE a big mismatch before getting to a tuned combination of L&C, thus tripping the amp. I have built a W6PQL 1kw amp with both protection bridges in it and it trips out with the N7DDC atu. Not sure how to over come it. With a manual ATU at least you can tune on rx for best noise before applying power.
> >? > I think that's what's happening, but willing to be proved wrong. I also think this will be the case for any auto atu that does not have "feedback controls" etc. My Elecraft Auto atu works perfectly, but then it has full control connecting the K3, KPA500, and CAT500. Bottom line is to use resonant antennas!
> >? > Geoff
> >? > G0DDX
> >?
> >?
> >?
> >?
> >?
> >
>
|
Bruce,
It sounds like the input impedance to your amplifier is not 50 ohms and the 7300 does not like it. I would try a 1dB attenuator circuit between the 7300 and amp. it will drop your power about 10 watts but your amplifier probably does not require 100 watts for full output.
Mike N2MS
toggle quoted message
Show quoted text
On 03/06/2025 10:44 AM EST Bruce Wolfe N6BMW <n6bmw@...> wrote:
Thanks for getting back to me.
Mike N2MS, not sure how that helps me. Sure, I have the amp in bypass mode when matching SWR. The issue is the rig's SWR goes up to the threshold after I take the amp off bypass.
I'm wondering if there is some buffer or filter I can put between the rig and amp.?
Also when tuning, a solid carrier is needed but the rig does RF spike above the set output using SSB. ID hate to have to go back to ALC control but I don't think that will fix it.
Nonetheless, I put my IC-7300 back into this system with the roller tuner and absolutely no issue and can drive the input up to 12w making the amp work the it's supposed to.
Have to do more troubleshooting with the ATU500w
On Wed, Mar 5, 2025, 7:22?AM Mike N2MS via groups.io () <mstangelo@...> wrote:
Have you tried matching with just your rig with the amplifier bypassed then turning on the amp?
I also find my tuners have trouble matching on 40 meters when switching from another band. If I power cycle the tuner it does fond a match on 40 meters.
Mike N2MS
> On 03/05/2025 2:48 AM EST G0DDX via groups.io () <g0ddx@...> wrote:
>
>
> I have the same issue with my Aliexpress supplied 1kw N7DDC auto atu, which works well. As far as I can see, as it tunes, it goes thru L&C combinations that ARE a big mismatch before getting to a tuned combination of L&C, thus tripping the amp. I have built a W6PQL 1kw amp with both protection bridges in it and it trips out with the N7DDC atu. Not sure how to over come it. With a manual ATU at least you can tune on rx for best noise before applying power.
> I think that's what's happening, but willing to be proved wrong. I also think this will be the case for any auto atu that does not have "feedback controls" etc. My Elecraft Auto atu works perfectly, but then it has full control connecting the K3, KPA500, and CAT500. Bottom line is to use resonant antennas!
> Geoff
> G0DDX
|
Thanks for getting back to me.?
Mike N2MS, not sure how that helps me. Sure, I have the amp in bypass mode when matching SWR. The issue is the rig's SWR goes up to the threshold after I take the amp off bypass.
I'm wondering if there is some buffer or filter I can put between the rig and amp.?
Also when tuning, a solid carrier is needed but the rig does RF spike above the set output using SSB. ID hate to have to go back to ALC control but I don't think that will fix it.
Nonetheless, I put my IC-7300 back into this system with the roller tuner and absolutely no issue and can drive the input up to 12w making the amp work the it's supposed to.
Have to do more troubleshooting with the ATU500w
Have you tried matching with just your rig with the amplifier bypassed then turning on the amp?
I also find my tuners have trouble matching on 40 meters when switching from another band. If I power cycle the tuner it does fond a match on 40 meters.
Mike N2MS
> On 03/05/2025 2:48 AM EST G0DDX via <g0ddx=[email protected]> wrote:
>
>
> I have the same issue with my Aliexpress supplied 1kw N7DDC auto atu, which works well. As far as I can see, as it tunes, it goes thru L&C combinations that ARE a big mismatch before getting to a tuned combination of L&C, thus tripping the amp. I have built a W6PQL 1kw amp with both protection bridges in it and it trips out with the N7DDC atu. Not sure how to over come it. With a manual ATU at least you can tune on rx for best noise before applying power.
> I think that's what's happening, but willing to be proved wrong. I also think this will be the case for any auto atu that does not have "feedback controls" etc. My Elecraft Auto atu works perfectly, but then it has full control connecting the K3, KPA500, and CAT500. Bottom line is to use resonant antennas!
> Geoff
> G0DDX
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Re: ATU-100 Board Question on FT-897
Hi, Mike
Absolutely no problems with upside down mount.
Also, this tuner can work with disconnected display, you can check? power and SWR on the rig's display as usual.
I would keep the Tune button somewhere for tuner reset ability.
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Re: ATU-100 Board Question on FT-897
I am still studying how to mount the ATU-100 Board in my Yaesu FT-897 Battery compartmemt. There are hole in the rear of the battery panel so I can mount the display and switches through these holes.
?
The battery compartment is at the bottom of the radio. are there any issues mounting the ATU-100 upside down?
?
Mike N2MS
?
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Re: duff aliexpress tuner
Hi all,
In this topic, the first thing to check... the dir and rev voltages. If they are not there, it is almost certainly a break in the secondary of the transformer (of one turn) from which DIR and REV are extracted.
Someone brought me such a tuner bought from China, applied power... did not measure anything; it was set to TUNE mode... did not start tuning. The defect was a bad soldering in tandem match.
73!
---
Cu ganduri bune,
Marius – YO6RK
senty.ro
73!
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Show quoted text
-------- Original Message --------
| Subject: |
Re: [ATU100] duff aliexpress tuner |
| Date: |
05.03.2025 14:45 |
| From: |
"David Fainitski via groups.io" <rolin791@...> |
| To: |
[email protected] |
Hi, Cal
SWR like 0.00 means it is unknown or impossible to measure, if input power near 0 an example.
|
Have you tried matching with just your rig with the amplifier bypassed then turning on the amp?
I also find my tuners have trouble matching on 40 meters when switching from another band. If I power cycle the tuner it does fond a match on 40 meters.
Mike N2MS
toggle quoted message
Show quoted text
On 03/05/2025 2:48 AM EST G0DDX via groups.io <g0ddx@...> wrote:
I have the same issue with my Aliexpress supplied 1kw N7DDC auto atu, which works well. As far as I can see, as it tunes, it goes thru L&C combinations that ARE a big mismatch before getting to a tuned combination of L&C, thus tripping the amp. I have built a W6PQL 1kw amp with both protection bridges in it and it trips out with the N7DDC atu. Not sure how to over come it. With a manual ATU at least you can tune on rx for best noise before applying power.
I think that's what's happening, but willing to be proved wrong. I also think this will be the case for any auto atu that does not have "feedback controls" etc. My Elecraft Auto atu works perfectly, but then it has full control connecting the K3, KPA500, and CAT500. Bottom line is to use resonant antennas!
Geoff
G0DDX
|
Hello All.
The power bottom, must be ON or OFF to charge?
73's Carlos Fonseca, CT1GFQ
SKCC #466T ( )
REP #1406 ( ) GPCW #20 ( ?) NRA #PN-081 () Em dom., 2 de mar. de 2025 às 14:06, David Fainitski via <rolin791= [email protected]> escreveu:
Hi .
There is no activation resistors so the most typeC chargers will not work. Use any typeA cable an chargers. That is not a big problem, you will need to do that once at year or twice.
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Hi, Mario
Atu 100m is closed commercial product as I know.
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Re: duff aliexpress tuner
Hi, Cal
SWR like 0.00 means it is unknown or impossible to measure, if input power near 0 an example.
|
Re: duff aliexpress tuner
On Sat, Mar 1, 2025 at 07:07 PM, Paul M3VUV wrote:
the swr readout stays at 0.00
David's the expert (I've never even looked at the source code) but it seems to me that the invalid '0' SWR reading/display means something and I'm not surprised that it won't tune. Can you control the relays in test mode and get a relay response or something other than zero SWR on the display? I suspect there are Stockton bridge faults that might produce a '0' SWR on the display.
?
I'm new to the N7DDC tuner. All of my experience has been helping Sardar as a beta tester of his QRP-Laps QMX+ABS implementation of the ATU, but I've built and experimented (hacked) my two builds to near death by wearing out the copper lands and plated through holes on my two PCBs with all my experiments and testing.
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73,
Cal AD8Q
?
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Re: duff aliexpress tuner
On Sat, Mar 1, 2025 at 07:07 PM, Paul M3VUV wrote:
I brought the atu-100ext assembled board from aliexpress, I swapped most of the caps for 750v silver mica types,
Speaking of 750V silver mica caps...are they made in the 2kV to 3kV range? I can't find anything but ceramic / MLCC in high voltage. After downloading the gerbers and BOM from I spent the better part of a day trying to import the EU2AV ATU-06-1.5Kw gerber files into a KiCAD project to generate PCBA BOM and pos files but discovered that a full featured KiCAD project file is not supported from the bare bones gerbers. Only the PCB copper can be edited, it seems, so the BOM and pos csv files must be manually generated (and I got bored with generating them very quickly)!
?
So I ordered the ATU-1000 kit from New DIY Tech, which did a good job with my (tr)uSDX kit but I'd be interested in upgrades of the transmatch network caps and anything else, if not too off-topic (sorry).
?
73,
Cal AD8Q
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va3rr