1500 output at 70% efficiency requires 1500/0.7! 2143W input, The difference is the dissipation of 643W. 1500W/643W=2.33 73 Peter 1500/643=2.33. I am sorry but I do not understand your numbers using
I obtained a used 3 element yagi on a 39 foot boom which I am in the process of rebuilding. Since I have some boom tubing left from ny previous yagi ruined by Kyrill I think about an OWA design. Is t
Thanks to the group for all the input and comments on that project. I finally have the EZNEC simulation ready for my environment and its looks real great. Slightly less maximum gain then my old 3 ele
The difference will be you canīt sum up the horsepower and torque of the ferraris and drive them at once, but you can sum up gain, supress high angle radiation and use all three antennas at once. 73
You will get proper splices for that type of cable, at least made by Spinner 73 Peter Anyone have some good tricks for splicing Andrew LDF4 1/2" Heliax ? This would be for HF use, only - not worried
Anyone have some good tricks for splicing Andrew LDF4 1/2" Heliax ? This would be for HF use, only - not worried about a small impedance bump. You will get proper splices for that type of cable, at l
Just a small quibble, because I agree with everything else that Gene has mentioned - my yagis are all insulated element Force-12 designs, and they work just fine as top-loading on 160 at low power (~
HI I am looking for heavy duty U-bolt saddle clamps to prevent slippage on big 7MHz yagi. (75mm boom.) Any idea about supplier in Europe??? TNX Bela OM8AW _______________________________________
--Original Message-- From: towertalk-bounces@contesting.com [mailto:towertalk-bounces@contesting.com] On Behalf Of Dennis Sent: Mittwoch, 24. September 2008 16:23 To: Richards; donovanf@starpower.net
Just how strong are ceramic egg insulators when used on tower guy wires? It doesn't seem right that these could stand 1000 lbs.+ of pull. What type should I use on my tower? KB3X ___________________
Hiya, Bill -- Most of the historic TIC posts on TT have had to do with problems. That figures since people don't make posts when things are going FB. No one has mentioned the new ring-type rotators f
I swear I've seen stuff on detuning a boom. I even thought I saw it in the ARRL Antenna handbook. However, I can't seem to anything. (I have found stuff about detuning towers). Any references? cheers
Is there any interest in repeating the studies? It's a huge amount of work, but technology has advanced, both in antennas and in measurement technique. Seems to me that the big resource consumer is g
or buy to pull a thrust bearing apart with to re-pack it with grease? I'm not that familiar with bearings or whether the tool used for automotive bearings that a mechanic might have would work or not
--Original Message-- From: towertalk-bounces@contesting.com [mailto:towertalk-bounces@contesting.com] On Behalf Of Richards Sent: Montag, 3. November 2008 19:50 To: K7LXC@aol.com Cc: w3ea@hotmail.com
To be honest, I'm not sure what the question is either :-) Folks seem to be equating self support towers with crankups, and who knows what else... Just to clarify the question in my OWN addled brain
Roger, I want to understand exactly what you're saying here. In a strong wind, would you expect there to be more total compression in the downwind leg with guys attached? I would expect just the oppo
Can somone help me out, i have a 450 ohm ladder line dipole i made. both sides are exactaly 123 feet and the 450 ohm line is 47 feet to the atr-30 to the balance terminals. the ladder line is away fr
Hi Roger, Option 1 should be absolutely no problem. One of my towers is 150m from the house. I put 5/8" and 7/8" surplus hardline and control cables down the tower and across the property (not buried
I believe the reason that verticals work better on lower bands is a result of lower takeoff angles on the low bands, low frequencies, whereas as you move to higher frequencies, the takeoff angle seem