"However, my concern is that we noticed, right after the storm had passed, that the tower had a noticeable "lean", in the upper third or so. toward the east. The strongest winds during the eye were f
Shawn. That will be determined by the terms and conditions of the policy (e.g., code grandfathering) along with input from the adjuster who inspects the damage. However, If you comply with current NE
Try and obtain either a CIA or VNA and sweep complex Z between the frequency extremes on both bands. Next, you can use TLW software and find combinations of C and L for several common tuners. Once yo
A surplus Harris or Collins auto-coupler would also work well when feeding an Inverted L. Paul, W9AC Sent from my iPhone5 _______________________________________________ _____________________________
I was employed by RKO Radio in Chicago between 1983-85. The main transmitters (alternate/main) were at Sears; the standby was atop the monopole on the Prudential Building. Sunday night preventive ma
The vertical height-to-diameter correction factor is discussed in Volume 2 of the ARRL Antenna Compendium. Getting a result first requires computing the height-to-diameter ratio -- which you already
Looks nice for the price, but some questions to ask: 1) Is it really a VNA? Or is it a Complex Impedance Analyzer (CIA)? I donšt see mention of a second port for full S parameter testing (e.g., S21 t
Looking for ideas to control a pair of existing M2 RC2800PX rotator units through the Internet. The M2 control box has a DB-9 serial connection that can be converted to USB with an adapter. A dedicat
Many thanks to all who directed me to PstRotator. The software has client and server modes, so that will be nearly ideal here. Paul, W9AC Looking for ideas to control a pair of existing M2 RC2800PX r
cylinder will decrease the inductance of any coil. I'm not sure it actually changes the inductance.. The parasitic C in parallel can change the "end to end" reactance so that it looks like L is lowe
Joe, Nice explanation of the SteppIR antennas. Paul, W9AC There is no trade-off in gain. Gain is almost entirely a function of boom length as long as you don't have to few elements. For example, Step
when an LPDA will do the same thing with no moving parts and, at most, 2dB of claimed gain.˛ Of course, there are still trade-offs with a LPDA. N4CC and I recently purchased a Tennadyne T14 (30m-10m
Thought I would share some lessons learned while recently installing a large ring ground system. The goal was to form a ring ground around two towers, AC power entry point, and a small telecom shelte
The gain of a LPDA should be mostly consistent across its designed frequency of operation. If it's not, then there's a design error. So, I would expect one gain figure +/- some amount of variation in
"...actually I find that M2 is right on in their numbers no specmanship here whatsoever." Then look here at the on-line M2 spec for their 12L LPDA model: "Gain 6.8 dBi / 11.6 dBi @ 45' " The gain is
"Mike brings up an interesting point. Yes, the antenna is important, but so is how high you put it up and the surrounding terrain. I can't stress strongly enough how important it is to do HFTA, espec
detailed level. So maybe if the L or the C of the trap changes significantly, then the trap resonance changes, which then changes the apparent series L or C in the element. Trap Q is more difficult
Recently, an article on p.43 in the February, 2015 issue of QST discusses trap performance and test fixture criteria. The article is titled: "Test Setup for Measuring Traps." The author used a miniVN
Anyone have a current e-mail address for Pete, K4EWG? I'm getting bounces from the address shown on QRZ.com. Please send private reply if you can help. Many Tnx! Paul, W9AC __________________________
N4CC and I have finally completed our remote Internet station in Hilliard, FL. Probably half our time spent before and during construction was studying and implementing lightning abatement. Ground ri