<div dir="ltr"><div>...aaaand, the best I can muster is this:</div><div><br></div><div><img src="cid:ii_mgsk14ko1" alt="Screenshot 2025-10-15 at 5.19.18\u202fPM.png" width="328" height="244"><br><br></div><div>Very strange. </div><div><br></div><div>I moved the feed point to get a lower impedance and trimmed the driven element quite a bit, but can't get it to come down at 444.3 MH.</div><div><br></div><div>At this rate, I am going to stick with 2 meters!</div><div><br></div><div>Dan KJ5IZK</div><div><br></div><div><br></div><div><br></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, Oct 15, 2025 at 4:20\u202fPM Daniel Poirot <<a href="mailto:dtpoirot@gmail.com">dtpoirot@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>TL;DR What does a 70cm VNA trace look like? </div><div><br></div><div><br></div><div>Howdy y'all,</div><div><br></div><div>The car is in the shop, so I had some time on my hands...</div><div><br></div><div>I took a 16 cm section of 450 Ohm ladder line, shorted one end, soldered on a 32.5 cm length of wire and BOOM. I have another J Pole. </div><div><br></div><div>I tacked on a short length of RG-8x, 1.6 cm from the end, and put a female BNC on the end. Closer still!</div><div><br></div><div>I calibrated my NanoVNA for 420-450 MHz and made a trace of SWR and Resistance. I am looking to hit the 444.3 repeater.</div><div><br></div><div><img src="cid:ii_mgshqznk0" alt="Screenshot 2025-10-15 at 4.16.08\u202fPM.png" width="324" height="242"><br><br></div><div>This here is some messed up stuff. Do I have to tune to catch 50 Ohms as it goes by?</div><div><br></div><div>The SWR minimum is to the left of 444.3, so my J Pole is long. I am about to nibble away. </div><div><br></div><div>Should I expect a 25 MHz cycle like this? The middle of the cycle will be crazy SWR and terrible resistance, right? </div><div><br></div><div>Comments welcome!</div><div><br></div><div>73</div><div>Dan KJ5IZK</div><div><br></div></div>
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