Hi Ed, The affect of the T-vertical on a nearby HF Yagi is easily modeled in EZNEC or your favorite antenna modelling program. You'll be surprised by the results if the horizontal top is +/- 15% of r
Hi Ed, A T-top at right angles to a Yagi will have little affect, but anything close to broadside is very bad within 500 feet or less on 40 meters. Fortunately a 60 foot top is just short enough to h
There is a many, many Russians on 160 meter FT8... -- Original Message -- Greeting all, This season has been interesting not because of highlights but because of a noticeable change in propagation at
Hi Ed, Your conclusions based on your modelling are completely consistent with my practical experience and modelling. The most likely degradation is a T-top between 60 and 75 feet long degrading the
Hi Paul, If you model -- or build -- a 40 meter Yagi with a nearby T-top vertical with a 60-75 foot top, you'll discover that when the 40 meter Yagi is turned so that its elements are parallel -- or
Hi Paul, A little modelling will answer the question more completely and accurately than I can answer it in writing. I was referring to the case where a 40 meter Yagi is on one tower and a T-vertical
There's no shortage of 2N5109s on eBay for about one dollar each www.ebay.com/sch/i.html?_from=R40&_nkw=2n5109&_sacat=0&_sop=15 73 Frank W3LPL -- Original Message -- Hi Rick, Yes, the 2N5109s are alm
One advantage of using Ebay is their excellent refund policies if you get cheated. I've used it many times and never suffered a loss. But you have only two weeks to file a claim. 73 Frank W3LPL -- Or
My experience with LDF4-50 and LDF4-75 is exact;y the same as Peter's. Its always best to use an antenna analyzer or TDR to cut all of the cables to the same length. Its very, very easy to do. -- Ori
"Sooner or later everything old is new again" (Stephen King) February 1922 QST page 30 The 1BCG antenna used for the transatlantic tests was a T cage over a radial counterpoise. The antenna is hung b
Hi Rick, A noise receiving antenna close to a noise source is used in conjunction with a higher performance receiving antenna such as a Beverage or an array of short verticals and a passive or active
W2MF also mysteriously disappeared... -- Original Message -- OK1RD disappeared from first place : http://www.arrl.org/system/dxcc/view/DXCC-160M-20200319-USLetter.pdf He voluntarily refused to be a l
Excellent skin depth reference here: www.antennasbyn6lf.com/files/ground_skin_depth_and_wavelength.pdf Ground characteristics are much more significant for vertical polarization than for horizontal p
N2MF also vanished from the 160 meter DXCC listings... -- Original Message -- I don't wish to drag this debate out any longer than necessary, but some credit is due the League and the DXCC desk. I wa
oops... It was W2MF who vanished from 160 meter DXCC A few weeks ago he was #296 Apologies to Brian N2MF #255 73 Frank W3LPL -- Original Message -- From: donovanf@starpower.net To: Topband@contesting
Hi Bob, Bonding (not grounding...) coax to the bottom of a tower helps to divert lightning currents from the coax shield to the ground system at the base of the tower Bonding coax to the top of the t
RG-17 has the same problem, but the Type LC connector (a giant F connector) solved the migration problem the same way the F connector does. 73 Frank W3LPL -- Original Message -- Very astute. You may
Hi Ed, What is the frequency of your local BCB transmitter? This is the best brickwall filter -- capable of handling 200 watts -- that money can buy. Its provides at least 40 dB of attenuation below
Ed, If your receive loop has a preamp at its feed point, its very likely that the preamp is being overloaded by the nearby BCB station. If that's the case, a filter after the preamp will not help. 73
It is with great sadness that I write this message. It has come to my attention that Marty Johnson W3YOZ has become a silent key as of 4-14-2020 I will post more information as it becomes available.