That's a useful tuner simulation; but **DO** remember it assumes a constant Q for the inductor. Here's how a real roller inductor Q measures at different inductance settings on different bands: http:
I seem to be having some problems with my small prop pitch rotor freezing up When the temperature is below freezing. I'm assuming it's a two part problem. First, water must be getting in somehow. Sec
OK, what's the procedure to prevent condensation from forming inside the center conductor of either LMR-1200 [which uses a hollow cu tube for a center conductor].... or ditto with 7/8" heliax ?? Are
Agreed! Someone earlier asked how much people got paid for working like this, let me answer that simply: If an employee or contractor of mine worked like that, he would not get paid.. and would never
then drive back. If a trucking co does it, and wipes out, and destroys the tower in the process, you are insured. Do it yourself, and you are out of luck. On a smaller, lighter tower, you would be pr
Rick, Way more people fall of ladders and are killed or crippled ask any ER doctor about Saturday and Sunday afternoons. My friends 30 year old daughter Debbie was cleaning a blocked downspout at 20
http://luso.us/index.html Check this out. They have a ton of u tube video's as well. Crank up tower's from 70' up to 330'. http://luso.us/tower%20150US.html This is the 150' model. A bargain for $36
http://www.youtube.com/watch?v=tz32kXTPZqU&feature=related Forget free climbing. This takes the cake. Jim VE7RF _______________________________________________ _______________________________________
I have a an ongoing project with my F-12 EF-180B. [68' long 80m rotary dipole]. I scrapped the stock LL wires. I added a 17.5' long ....'T-bar' [capacity hat] 15' out on either side of the feed-point
I'd not use any lube on tower joints, or any material that would reduce the gripping action of the leg overlap as that would reduce the over all tower strength and put more load on the bolts, which c
I was wondering is anyone is using ring rotors on one of the larger crank up towers to stack yagi's (along with a rotor on top)? Thanks in advance. Mike K9MK the same brackets that hold up the big 'Q
"Quiescent current (bias) in the RF amplifier section is adjustable. This adjustment directly affects output signal harmonic content. Harmonics are worse with low supply voltages, and with low impeda
Petroleum Jelly ,.... Vasoline.... works well, but why worry ... just pour .. and 12 hours later, remove the wooden frame .. concrete will NOT be sticking YET. 73 Don N8DE latest tower project. The h
The shortened multiband dipoles sold by Hypower Antenna Company are a pretty good design. I've successfully used two different versions in several different locations with very good results. Plugging
I think the primary value of fractal antennas (over other frequency independent or broad/multi-band designs of one sort or another) is as a unique marketing tool for product differentiation. Along th
Ok, has anybody tried retrofitting the stock 3/16" solid LL wires in a F-12 340N [3 el 40m yagi] with coils ?? On paper, this looks fairly straight forward. To save weight, and still keep the UN load
How much RF current typ flows in the REF + DIR on a 3-el yagi ? YO just shows a 'relative' scale for the parasitic ele's. IE: just to simplify things, let's say we have 10A flowing into the 30 ohm fe
Jim, I would opt for the clamp on RF transformer... Now, having said that, I recognize that anything we do to measure the RF current is going to upset balance, impedance, etc. to a greater or lesser
I can report that the ham purchase program works as advertised for about $85. I bought the 12V version and rebuilt my homebrew QSK circuit for my linear. I used the speed up circuit shown here: http: