M&P connectors seem big and they twist. I bought a few of their cables and they seem to have the loss as advertised. But one of their 7mm cables developed an intermittent that took a long time to fin
I would like to phase my current JK Mid Tri 40 on 100' of 45G with JK Mid Tri at 65-70'. Two options are fixed mount to EU or swinging gate like below: http://www.idctechnology.net/sw/sw.html one is
I have JK Mid Tri 40 at 100'. I adjusted it at the 5 ft level for resonance as in the manual (200 KHz down), and the resonance turned too low at 7.020. SWR is about 2:1 at 7.1 and 3:1 on 7.2. But I a
Interesting discussion, with many points coming from simulation. I am just wondering how good the simulation is for vertical antennas since it seems to depend on zillions of factors. Much more than f
I am adding a tribander for stacking and need to have the same length of coax as the first antenna. Are TDR measurements good enough? TDR measurements via RigExpert seem to be +-1 ft accurate. Ignacy
Actually, Charlie's problem is an exciting one to look at and experiment. Not sure what he means that the array is not working. I suspect poor F/B or high SWR. Many ways to troubleshoot when the weat
Happy New Year! I bought 26 ac of land with an old house for a remote station. The power company buried the last 300 ft of power line. Now, the location has 100ft tower with 40-10 beam, 4 sq on 80, w
Thank you for many useful directions. As my noise is usually cancelled completely by a noise blanker, this suggests a powerline noise. The noise persists with the local power off so it is not generat
A few weeks ago I asked for help with RFI on my "dream" rural ham-radio property. A powerline-type noise was present 24h/day and was strongest on 15m peaking S5. Readings from beverages and 4 sq were
A manager said they disconnected the transformer. That pole was old and not used in years so there was no reason to keep it on. Ignacy NO9E _______________________________________________ ___________
Perhaps not too much magic. 40m vertical on 20m would act as half wave, with a low radiation angle. 80m vertical on 20m would act as full wave, with a high radiation angle. Because of mismatch the si
I am hoisting JK Mid Tri (100 lb) to 65' on a 100' 45G. There are 3 sets of guy wires at 32', 62' and 95'. I am not clearing one guy at 62'. If I remove that guy wire, should I loosen the other guy w
Thank you all for the very useful comments. In the end, I moved the hoist point from 80' to 95', and the antenna cleared the guys. My wife helped (grudgingly but effectively) looking at the antenna a
My feeling is that modeling with verticals is less than perfect or perhaps the interpretation of results from modeling is imperfect. In 160m contests we hear signals that are poor, OK and spectacular
N6LF study was in OR (?) with good soil and on 40m. W8JI found by measurements that elevated radials (in GA) on 160m work a few db below the ground radials. His results as well as experiences of othe
For small space: Coax or magnetic loop - quiet but does not hear DX well K9AY - quiet with some but not great directivity DxEngineering 4 square - good directivity but seem to require switching off o
OB40-M weighs 35 kg (77 lb) and by specs it covers all of 40m with SWR < 2. A shortened Moxon from JK Antennas: JK 402-Piccolo with coils weighs 88 lb and covers only 250 KHz. A full size Moxon JK420
My QTH has two sets of antennas. A 100 ft tower with phased beams at 100 and 60 ft, also supporting 4 sq for 80 and shunt fed for 160m. Some 120ft apart, a Spiderbeam on a 45 ft aluminum Spiderpole a
He did! And he told me to ground it with three 10ft grounding rods! Tnx Dan for putting up the tower! Igancy NO9E _______________________________________________ _____________________________________
Gigaparts has a line for carbon fiber masts from 25ft that they say can support up to 30 lb. The masts are incredibly light. A 34 ft mast weighs 5lb and a 50ft mast is 9 lb. I tried them at the SEDCO