All I'm working on installing an 80/160 inverted L that will be approximately 165' in total length with the vertical portion being 88' tall and the rest of the wire (77') running out to a 80' tall pa
Hello to the group I'm a newbie to 160 having only participated in various contests over the course of the last two years. I used an 80 meter aluminum tube vertical with a Reyco trap affixed to the t
Thanks to all who responded to my post I will consider all of the ideas that were presented including improving the ground radials. That's a given. I have an ICE broadcast filter for RX...can this be
Sorry I sent the last post by accident. To the point what I'm seeing is a resonance OF THE TOP WIRE ONLY. This explains why my MFJ reads R=4 ohms at 1820...it's grounding or shunting the whole vertic
Chet Tom's right. I get a clear dip at 8 MHz with X=0 and 5 MHz with X=0, both with good indications of varying reactance on both sides of the resonant freg. I'll give his suggestion of 129' length a
Topbanders If you followed my post on 'In search of resonance' you'll see that I was struggling with feeding a 160m inverted L up close to my 90' Skyneedle. Tom W8JI suggested that I cut back the L t
Tom and group The SWR is 2.4:1 at 1822 I have an old Heathkit tuner that has a pair of air variables that I may temporarily yank to experiment with gamma vs. omega matching. I've got a wing wang capa
ON4UNs graph in his book states that my 27m tower with 13' mast and 5 ele 20m monobander (@ 28m high) is good for about 115 degrees. Other old school references place it at 140 degrees. Per my past p
Topbanders Well, after experimenting with shortening the gamma wire from the bottom I saw NO changes on the MFJ....none. So, option two was to lower the whole tower down and remove the gamma arm from
Thanks for the input Tom The only variable cap I have is the EF Johnson which is 60-160pf. I have some ham radio stuff at my parents house not the least is a Jennings 1000pf vac variable rated at 5KV
Bruce I work with AC inverters for industrial motor control and their presence obsoleted one of my competitor's overhead crane radio control product practically overnight. A simple hand held AM "tran
List Some of you may have followed my efforts in trying to shunt feed my 90' Tri-Ex Skyneedle with 20 meter yagi at 93'. I'm still unable to find any sort of resonance point on the tower. To refresh
Thanks Dean The one I'm looking at is the old heathkit with the various coil plug ins. The kit comes with a coil that goes down to 1.600. Is there another one you can recommend that may go down furth
Joe Thank you. Yes I agree. I've got PVC insulator arms that I've already bought fittings for them that will allow me to create a three wire cage spaced any distance I'd like. I presume the cage shou
Tom and all Thanks for the responses. I was under the assumption that I would find a 50 ohm tap on the tower but with a lot of reactance requiring a cap that would tune out the X but leave the 50 ohm
Charlie Thank you for your work and insight. It appears I've I may have provided some incorrect info. When I tapped the tower at 90' I used the 160pf variable cap to get down to the 68 ohm impedance
Charlie FYI. I'm using 60' to 70' of LMR400 from my panel at the base of the needle to the shack. No long runs here. Carl AG6X Sent from my iPhone Well, here it is with the re-built loss table, Carl
Tom After reading your post yesterday I had a dream that I woke up and saw one of those flying monkeys on top of my tower laughing and sawing away. Carl AG6X Hi Carl, It sounds like you are trying to
All I decided to take a chance at tapping the tower at 67' and apply some series capacitance to see how the structure would work there before tapping it at the 90' level. Here is what I found: The ga
Thanks Charlie I haven't transmitted on the antenna yet but I did hear KH6XX, KH6LC and WL7E this morning along with a bunch of stateside guys participating in the contest. N7GP and K7FA in AZ were +