Coupling with respect angle is generally a function of square of the cosine of the angle between the two elements. Thus at 5 degrees offset, the coupling loss relative to perfect alignment would be a
Tom, In the past, I remember you mentioning the use of common mode chokes (air wound) for lightning protection. Do you put these on the shack side of your SPG bulkhead or do you put them on the anten
As far as I know, the answer is no. EZNEC 3.0 will, however, dump a summary of the antenna's pattern characteristics versus frequency to a text file (the filename and location is specifiied in the fr
Stephanie, I wonder if the Pro 95 is properly torque balanced. On many antennas, the mechanical center of the boom, the center of gravity, and the neutral torque point are all in different locations.
Bruce, The difference neglecting the additional connector losses is 0.76 dB. At 1500 watts, the difference in power delivered would be 174 watts. The losses associated with the additional splice will
Wow, Henry, thats a hard act to follow. I am 36 years old, have an EE degree, and am still struggling to get my homebrew radios to work :) With regard to public exposure of ham radio, Tree, N6TR and
Seems like some enterprising person might go out a buy two XM-240's and put them together on a single boom long boom a la the KLM 40M4. Once the design parameters became a known quantity, and the dem
I would smear the threads of the SO-239 with silicone high vacuum grease and then install an empty PL259. Put a little SHVG on the center pin of the PL to protect the female socket on the jack. As lo
At that price, you should at least get a manufacturers certificate of compliance (from the people who made the hardware - not Mosley) stipulating to its meeting some minimum set of specifications (ma
McMaster Carr is also a good source, Jim. Their prices are decent and they specify the grade of steel that you are getting. Web orders are generally shipped the same day. Their whole 4 inch thick cat
The so-called current balun is only immune to saturation with respect to the normal transmission line mode signal where the fields from the two conductors are out of phase and cancel. With respect to
I don't see what the big deal is with respect to handling charges. As long as a vendor lets you know up front that they are tacking on a handling charge, then you have the option to go somewhere else
This happened one time when I was going to school at Ohio State. I don't recall exactly how he discovered it, but N8SM was drawing 3 to 4" long arcs off the feedline of W8LT's 600' long wire. As I re
According to the field strength graph in N6PL's vertical antenna book, 15 1/4 wave radials under a 1/4 wave radiator would yield an efficiency ~70% of that which would be acheived using 113 radials (
No, Chris, you are quite correct. The monopole over a perfectly conducting ground has 5.15dBi gain. Both antennas patterns have the same shape in the elevation plane, only in the case of the monopole
Are there any utilities out there which will take an antenna file in AO format and translate it into EZNEC format or vice versa? Thanks, Mike, W4EF............
Hi Jim, The LPDA models I have seen, use a single source connected to a balanced transmission line running the length of the LPDA. The element connection to the transmission line are alternated to cr
The other thing to watch for is the 1/4-20 bolt that hold up the spline shaft. In our haste at the club we left out the lockwasher and this bolt eventually loosened causing the spline shaft to drop a