/g/ATU100 First time starting a group but with all the kits out there, I thought maybe some operators would like to share their interest on this cheap but nice 100watt and a QRP(coming), Automatic Antenna Tuner. Originally built and developed by N7DDC. Thu, 25 Jun 2020 07:49:23 -0700 /g/ATU100/message/3559 <div>Hello</div> <div>According to the photos, a Stockton bridge must be replaced to bigger core , everything else should to hold 150W</div> <div><img src="/g/ATU100/attachment/3559/0" loading="lazy" class="myimg-responsive"/></div> rolin791@... (David Fainitski) Fri, 11 Apr 2025 08:23:54 -0700 /g/ATU100/message/3558 <div>Hello,</div> <div>聽</div> <div>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.</div> <div>聽</div> <div>I saw this ATU-130:</div> <div>聽</div> <div><a href="https://www.amazon.com/Automatic-1-8%E2%80%9150MHz-Aluminum-Miniature-Shortwave/dp/B0CHCDKSTS" target="_blank" rel="nofollow noopener">https://www.amazon.com/Automatic-1-8%E2%80%9150MHz-Aluminum-Miniature-Shortwave/dp/B0CHCDKSTS</a></div> <div>聽</div> <div>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?</div> <div>聽</div> <div>Any feedback is appreciated? I&#39;d like to order it from PRIME so that I can return it. Does anyone recommend any other PRIME store?</div> <div>聽</div> <div>73,</div> <div>聽</div> <div>Mike N2MS</div> <div>聽</div> <div>聽</div> mstangelo@... (Mike N2MS) Thu, 10 Apr 2025 15:17:40 -0700 /g/ATU100/message/3557 <a href="https://github.com/Dfinitski/N7DDC-ATU-100-mini-and-extended-boards/blob/master/ATU_100_EXT_board/Schematic_ATU-100%207x7.pdf" target="_blank">https://github.com/Dfinitski/N7DDC-ATU-100-mini-and-extended-boards/blob/master/ATU_100_EXT_board/Schematic_ATU-100%207x7.pdf</a> va3rr@... (va3rr) Thu, 13 Mar 2025 09:28:41 -0700 /g/ATU100/message/3556 <div>where can i find it,github says file unavailable!.</div> nanovnauser@... (Paul M3VUV ) Thu, 13 Mar 2025 09:23:50 -0700 /g/ATU100/message/3555 <div>Hello David, thanks very muy for your indications, I installed a<span style="color: #333333; font-family: system-ui, Roboto, Arial, sans-serif; font-size: 16px; font-style: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-transform: none; word-spacing: 0px; background-color: #ffffff; display: inline"> 2k7 resistor and the problem is solved!<br/><br/><img src="/g/ATU100/attachment/3555/0" loading="lazy" class="myimg-responsive"/><br/></span></div> marcisne@... Fri, 07 Mar 2025 05:59:29 -0800 /g/ATU100/message/3554 <div><div>Not following, Robbie. I do that regularly but the amp trips anyway because the ATU is mismatching the input impedance. I&#39;ll try Mike N2MS attenuator solution.</div><div><br/></div><div>Do you have any attenuators to suggest?<br/></div></div> n6bmw@... (Bruce Wolfe N6BMW) Thu, 06 Mar 2025 16:20:52 -0800 /g/ATU100/message/3553 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鈥檚 happy turn up the power as much as I need to. <br /><br />You just need to find what your combination likes. <br /><br />Best regards, Robbie itrda@... (Robert Aiken) Thu, 06 Mar 2025 16:11:21 -0800 /g/ATU100/message/3552 My mistake. Still the attenuator may help.<br /><br />Mike N2MS mstangelo@... (Mike N2MS) Thu, 06 Mar 2025 14:36:33 -0800 /g/ATU100/message/3551 <div>It&#39;s the Flexradio that has the issue, not IC-7300.</div> n6bmw@... (Bruce Wolfe N6BMW) Thu, 06 Mar 2025 12:33:09 -0800 /g/ATU100/message/3550 Bruce,<br /><br />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.<br /><br />Mike N2MS mstangelo@... (Mike N2MS) Thu, 06 Mar 2025 10:32:15 -0800 /g/ATU100/message/3549 <div>Thanks for getting back to me.聽<div><br/></div><div>Mike N2MS, not sure how that helps me. Sure, I have the amp in bypass mode when matching SWR. The issue is the rig&#39;s SWR goes up to the threshold after I take the amp off bypass.</div><div><br/></div><div>I&#39;m wondering if there is some buffer or filter I can put between the rig and amp.馃</div><div><br/></div><div>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&#39;t think that will fix it.</div><div><br/></div><div>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&#39;s supposed to.</div><div><br/></div><div>Have to do more troubleshooting with the ATU500w</div><div><br/></div><div><br/></div></div> n6bmw@... (Bruce Wolfe N6BMW) Thu, 06 Mar 2025 07:44:15 -0800 /g/ATU100/message/3548 <div>Hi, Mike</div> <div>Absolutely no problems with upside down mount.</div> <div>Also, this tuner can work with disconnected display, you can check聽 power and SWR on the rig&#39;s display as usual.</div> <div>I would keep the Tune button somewhere for tuner reset ability.</div> rolin791@... (David Fainitski) Thu, 06 Mar 2025 07:21:51 -0800 /g/ATU100/message/3547 <div>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.</div> <div>聽</div> <div>The battery compartment is at the bottom of the radio. are there any issues mounting the ATU-100 upside down?</div> <div>聽</div> <div>Mike N2MS</div> <div>聽</div> mstangelo@... (Mike N2MS) Wed, 05 Mar 2025 09:43:41 -0800 /g/ATU100/message/3546 <html><head><meta http-equiv="Content-Type"/></head><body> <p>Hi all,</p> <p>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.<br/>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.</p> <div id="signature"> <div class="pre" style="margin: 0; padding: 0; font-family: monospace">73!</div> <div class="pre" style="margin: 0; padding: 0; font-family: monospace"><br/>---<br/>Cu ganduri bune,<br/>Marius 鈥� YO6RK<br/>senty.ro<br/>73!</div> </div> <p><br/></p> <p></p> marius@... (Marius - YO6RK) Wed, 05 Mar 2025 09:37:50 -0800 /g/ATU100/message/3545 Have you tried matching with just your rig with the amplifier bypassed then turning on the amp?<br /><br />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.<br /><br />Mike N2MS mstangelo@... (Mike N2MS) Wed, 05 Mar 2025 07:22:16 -0800 /g/ATU100/message/3544 <div dir="ltr"><div>Hello All.<br/><br/>The power bottom, must be ON or OFF to charge?<br/><br/></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>73&#39;s Carlos Fonseca, CT1GFQ<br/>SKCC #466T ( <a href="http://www.skccgroup.com" target="_blank" rel="nofollow noopener">http://www.skccgroup.com</a> )<br/>REP #1406 ( <a href="http://www.rep.pt" target="_blank" rel="nofollow noopener">www.rep.pt</a> )</div><div>GPCW #20 ( <a href="https://gpcw.blog/" target="_blank" rel="nofollow noopener">https://gpcw.pt/wp/</a>聽) </div><div>NRA #PN-081 (<a href="http://www.nra.pt" target="_blank" rel="nofollow noopener">www.nra.pt</a>)</div></div></div></div></div></div></div><br/></div><br/><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">Em dom., 2 de mar. de 2025 脿s 14:06, David Fainitski via <a href="http://groups.io" rel="nofollow noopener" target="_blank">groups.io</a> &lt;rolin791=<a href="mailto:gmail.com@groups.io" rel="nofollow noopener" target="_blank">gmail.com@groups.io</a>&gt; escreveu:<br/></div></div> ct1gfqgrupos@... (Carlos Fonseca - CT1GFQ) Wed, 05 Mar 2025 05:00:36 -0800 /g/ATU100/message/3543 <div>Hi, Mario</div> <div>Atu 100m is closed commercial product as I know.</div> rolin791@... (David Fainitski) Wed, 05 Mar 2025 04:51:56 -0800 /g/ATU100/message/3542 <div>Hi, Cal</div> <div>SWR like 0.00 means it is unknown or impossible to measure, if input power near 0 an example.</div> rolin791@... (David Fainitski) Wed, 05 Mar 2025 04:45:09 -0800 /g/ATU100/message/3541 <div>On Sat, Mar 1, 2025 at 07:07 PM, Paul M3VUV wrote:</div> <div> <blockquote>the swr readout stays at 0.00</blockquote> </div> <div>David&#39;s the expert (I&#39;ve never even looked at the source code) but it seems to me that the invalid &#39;0&#39; SWR reading/display means something and I&#39;m not surprised that it won&#39;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 &#39;0&#39; SWR on the display.</div> <div>聽</div> <div>I&#39;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&#39;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.</div> <div>聽</div> <div>73,</div> <div>Cal AD8Q</div> <div>聽</div> cbrabandt@... (Cal (AD8Q)) Wed, 05 Mar 2025 04:40:30 -0800 /g/ATU100/message/3540 <div>On Sat, Mar 1, 2025 at 07:07 PM, Paul M3VUV wrote:</div> <div> <blockquote>I brought the atu-100ext assembled board from aliexpress, I swapped most of the caps for 750v silver mica types,</blockquote> Speaking of 750V silver mica caps...are they made in the 2kV to 3kV range? I can&#39;t find anything but ceramic / MLCC in high voltage. After downloading the gerbers and BOM from <a href="https://www.ur4unr.com/2021/10/15/atu-1-5kw-n7ddc-mode-by-eu2av/" target="_blank" rel="nofollow noopener">https://www.ur4unr.com/2021/10/15/atu-1-5kw-n7ddc-mode-by-eu2av/</a> 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)!</div> <div>聽</div> <div>So I ordered the ATU-1000 kit from New DIY Tech, which did a good job with my (tr)uSDX kit but I&#39;d be interested in upgrades of the transmatch network caps and anything else, if not too off-topic (sorry).</div> <div>聽</div> <div>73,</div> <div>Cal AD8Q</div> cbrabandt@... (Cal (AD8Q)) Wed, 05 Mar 2025 04:39:20 -0800