I have built several chokes on FT240-31 cores with RG142 double silver shield TFE coax (ok for QRO anywhere at HF) and measured them with my VNWA 2.6. For my 160m top loaded vertical I stacked three
Posted on towertalk yesterday was the link to the free download of the 1952 text Radio Antenna Engineering http://www.lulu.com/us/en/shop/edmund-laport/radio-antenna-engineering/ebook/product-1756029
Here is a little data in a sea of complexity: My 160m T is 10' up at the base with 6 x 125' radials elevated ten feet (4 more planned), in a mixed hemlock/red cedar/alder forest/clear area. The top i
Wondering what experience there is for 3L Bruce arrays and if a reflector has been tried? It looks like a good "bang for the buck" way to get some low angle gain. My interest is to 80m to improve low
My uncle W2NPR George Saviers(SK) was an RF engineer at KDKA radio in the 1930's when the "original" Saxonburg, PA 718' tower collapsed due to a guy failure while under construction in 1936. As he to
I haven't heard the farmer story, but in the 60's lived 1000yds from the KDKA radio tower in Allison Park, PA. That area is rough up and down small hills, not much farming. KDKA/Westinghouse did expe
Try a large transformer shop. 5kw and up transformers often use it. I've bought round magnet wire from temcoindustrialpower.com, but don't see rectangular wire on the web site, so give them a call fo
There are plenty of Allen Bradley 1w real carbon composition resistors on ebay at prices ranging from $0.25 ea to absurdium. Buy some that you can series/parellel to get the value you want. If it doe
In order of approximate decreasing importance: 1. the elevated radials should not be grounded anywhere. 2. With elevated radials, you must have a good feedline choke at the feedpoint, about 9 turns o
I had a 40m and 80m top loaded vertical on galvanized steel roofs. The 80m was outstanding for DX and the 40m so-so since the roof was not well bonded electrically. IMO, unless you can insure electri
Or you could replace the open wire line with a bi-directional coax cable Beverage. see ON4UN. I've built a couple from RG58 and they worked ok. RG6 would be stronger, but might have a bit more loss w
How about a compass and declination map? A bit simpler & good enough +/- 2 degrees. http://www.ngdc.noaa.gov/geomag/WMM/image.shtml The standard for course plots on nautical charts is the letter "T"
At my (former) CA ranch QTH, in the hills only 4 miles east of downtown San Jose, our cats weigh 130#. Sorry I can't send the game camera pix of the gorgeous mt. lion taken a couple of weeks ago near
And one more question - ON4UN in V5 states that the Spitfire will lose a few db of gain due to ground losses. How does one calculate near field ground losses? What software is needed? A related quest
The SignaLink supported software page has a nice summary of software decoders see http://www.tigertronics.com/sl_soft.htm If "universal" means automatic selection of the correct decoding mode, that w
An interesting point from Tom re SSB modulation added problems. A really informative website re "plain old RTTY" is http://www.frontiernet.net/~aflowers/k3rtty/k3rtty.html and is a good introduction
Hoping for some help to be able to use some older Philly. The factory tells me their grips won't work on "parallel strand" construction which is what I have, epoxy potted sockets are required. Howeve
Thanks to all who provided info and suggestions. I plan to run some tests, starting with a modification to my 20T "H" frame press so I can tension test specimens up to 10k lbs or so and measure force
I'd like to understand how NEC 4 achieves this "calibration" for MW BC ground systems. Do others share this concern? What errors are introduced for other analysis as a result? Grant KZ1W ____________
My VNWA V2.6 factory assembled Vector Network Analyzer, designed by DG8SAQ is available for $400 incl shipping, USA only, as I upgraded to the newer version V3. 1KHz to 1300MHz, 2 port, USB powered,