Don't forget, the phase change in a cable is not equal to the electrical length of that cable if the SWR is not unity. You will need to calculate the necessary electrical length of the cable carefull
Mike, The lobe/null structure of this array is such that the elevation would need to be well above 20 degrees before the ground reflection disappeared. The arrival angle statistics in the ARRL Antenn
Lee, The Hy-Gain AV-18VS is essentially the same as the old Gotham vertical - except that Hy-Gain may use better quality material. The Hy-Gain manual is: www.hy-gain.com/man/pdf/AV-18VS.pdf 73, ... J
Running the scenario in YO results in a change to the tip lengths of less than 1/16" to maintain the same resonance. Shortening the 1.125" tube by 1" and lengthening the .875" tube by 1" require the
Unfortunately, it is not just domain names that get hijacked ... There is one amateur radio manufacturer in Italy that hijacks his competitor's names in the search engines. He pays to place his compa
Because you are in an area where icing can occur, Rohn 25 would not be self supporting at 40 feet. In icing conditions the wind load rating for a 70 MPH region is 2.5 square feet at 30 feet and no an
It depends entirely on what your goals are on the low bands. DX is primarily a low angle mode ... the low dipole may have more gain at its maximum point but unless the dipole is more than 1/4 wave ab
Barry, Download the A3, D4 and A743 (40/30 meter kit) manuals from the CushCraft web site and compare them. You should be able to use the parts from the D4 as an A743. The 10 and 20 meter traps are i
Another non-wire option is "Poly Stakes" from Home Depot. Internet # 161225 Catalog # 100081721 Store In-Stock SKU # 739882 They are 9" long poly stakes used for holding lawn edgings or pavers. Six i
Actually, the same "outdoor" unit was used with the Drake Station Console (C4) and the stand alone RCS-4 switch. Both of those were 4-line accessories and predate the CS-7. Pictures of the RCS-4 are
Terry, Look carefully at the design of ANY stacking switch. Many use a single fixed 2:3 turn radio autotransformer (2.25:1 impedance ratio) as a compromise for both two antenna and three antenna stac
Dave, Here's one source off the net: http://www.k6if.com/40dip/40dip.html It looks interesting though I would feel better stepping up the tubing sizes (start with 1.25" or 1.5"). 73, ... Joe, W4TV __
Jon ... to correct the record the A4S is a three element yagi on 10 meters. The trapped reflector is active on 20/15 and the single reflector is active on 10 meters. With the A4, the longer boom prov
Pete, Nobody at ARRL looks at these before publication. The "New Product" announcements are manufacturer's press releases. The press releases go in an "inbox" and the layout staff grabs whatever they
Not true. The BN-86 is a voltage balun (three windings on a ferrite rod). The BN-4000 is the newer design "current" balun (ferrite beads on coax). 73, ... Joe, W4TV _________________________________
W4RNL has done his usual excellent job modeling and studying the "wideband folded dipole" (e.g., "the B&W Antenna"). See his web page at: http://www.cebik.com/wire/wbfd.html. The quick take away from
Larry, Looking at the (sparse) information available on the SGC web site. it looks like the SGC-103 and SCG-104 are classic "wideband folded dipoles." The length is given as 90 feet (27 meters) and f
JC, The issue with "at the feedpoint" vs. Force 12's specifications which call for 100' of coax is LOSS. Loss in the coax, even 1 dB in 100' for RG-213 at 28 MHz, causes the apparent SWR and SWR band
Don't even think about trying to move with a dish in the vertical position. The broadcast satellite trucks stow their dishes "face down" on the top of the vehicle. Any other orientation will most cer
KA9FOX at QTH.COM also offers an e-mail only option for $12.00 per year. POP3/SMTP or IMAP e-mail an alternate port that is not blocked by normal ISPs, 200 M storage and five e-mail accounts. You may