All Topband list If you've followed my efforts to shunt feed my Skyneedle tower you'll know that I settled with a tap point of 67' and 30" or so of spacing with my feed point reading 42 + j0 ohms. Th
Since then I've moved the variable capacitor inside the panel and mounted it to a ¾" think Plexiglas sheet mounted to the back plane with nylon bolts and washers. There is a 1" air gap between the Pl
Well, Carl I plotted your 45-j11 load on a Smith Chart (normalized to 50 ohms) and it's very near the origin on a 1.3:1 VSWR circle. Since you have a relatively short feedline of LMR-400, You should
Thanks to all who replied Tom W8JI, your comments on the metallic panel and the static bleed choke make sense. I was so pleased with the FLAT SWR reading with the variable cap outside the panel but I
I'd think your Henry would match that just fine WITHOUT the Nye Viking tuner!! 73, Charlie. K4OTV Thanks to all who replied Tom W8JI, your comments on the metallic panel and the static bleed choke ma
Well, you can do all that, Carl But if your series variable capacitor is not maxed out (fully meshed) if you can increase the capacitance enough to get to j0, you would be at 45 +j0 and on a 1.1:1 VS
The only benefit of getting it better would be a bit more 2:1 VSWR bandwidth to keep the amp happy but even then there is sometimes a gotcha when tuning an antenna. Carl KM1H Well, you can do all tha
Thanks guys The j11 ohms is the best I can get period. I was able to get j0 when the cap was outside of the steel enclosure with a better bandwidth. Maybe I should throw my $400 enclosure and find a
Well, if I recall correctly, Carl, Carl said his feedline was about 70' of LMR-400, so even at 2 2:1 or 2.5:1 VSWR, the excess losses in 70' of LMR-400 at 1.8 MHz are almost 0, so if he can match it
Charlie The cap is no where near maxed out. I'm using approx 150pf of a 1050pf variable cap. Carl Well, you can do all that, Carl But if your series variable capacitor is not maxed out (fully meshed)
Well, Carl, you might pick up a littie less shunt C with the vacuum variable, and if it will provide more capacitance, it will probably allow you to get to j0. I guess if you don't have some other ne
Well, that would surely suggest that you should be able to reach j0, by increasing the series capacitance, Carl, unless there's a shunt-C term that has entered the picture after mouning that big vari
I'm working on the radial field weekly. Here is a theoretical question that results from my particular QTH. The Skyneedle is situated near a secondary blacktop driveway that is in the back of my prop
Hi, Carl Well, I think that what you are doing with your radials should be OK. I guess I'd rather get them under the asphalt if I could where they wouldn't get torn up or b a trip hazard. BTW I I was
The j11 ohms is the best I can get period. I was able to get j0 when the cap was outside of the steel enclosure with a better bandwidth. Maybe I should throw my $400 enclosure and find a fibergla$$ e
Tom I assume the system has reactance since the MFJ is reading the "X" and I'm seeing the resulting SWR on the analyzer AND at the rig. The swr at my given freq as tuned with the variable cap is 1.3:
Charlie Thanks for the tip. I may play with a bit of inductance just to see how the system reacts. Not sure if I can post a pic here but I'm including a shot of the panel and the cap...hope you all c
Hi, Carl Well, paying with your load on a Smith Chart, tuning out the -j11 only improved the VSWR from 1.3:1 to 1.1 - not really worth doing! Also, you would need a fairly large inductor to obtain 1
Thanks for the tip. I may play with a bit of inductance just to see how the system reacts. >>> This is way more problematic than it needs to be. First, no one even knows if the reactance is real or a
Im not concerned by what is measured at the matching unit or a miniscule cable loss; just what is transformed back to the amp and its ability to load at full power without arcing, running out of or h