When line loss or noise pickup on the feedline is a significant factor, locating the preamp at the antenna is the preferred method. For 2M and up for example where line losses are high, it is imperat
Just finished a balanced loop preamp and remote tuner. Has applications in LF and MF frequency range. If interested, check out my homepage and look under "December 2000 Projects". Happy Building, Geo
First of all, after having talked to Earl Cunningham K6SE, my suggestion is to use the exact measurements and techniques described by him for the Pennant transformer. There IS some variation in the p
Of course I dropped a decimal point in one of my readouts. 10 T on an FT 140-43 should be 95.0 uH not 950 uH. The actual measured inductances have been running higher, never lower. The AL value is su
CONCERNING TOPBAND and VHF ON ZD7: Once again trying to get a package of odds and ends together to send to St. Helena. Anything would be appreciated from your junkbox. They can't get even scrap wire
Fred, here is a drawing for a 160M bandpass filter. The first section is a 5 element Chebyshev lowpass filter and the second section is a 7 element Chebyshev hipass filter. Different values are given
Don, K4ZA is headed down to St.. Maarten in a few weeks and was running short of time to assemble all the equipment, so he asked me to come up with a suitcase-able version of the 160M SLOOP (Shielded
My MFJ 259 bottoms out at about 1780 kHz, well within tolerance of the specs. On some occasions, especially when building notch filters and bandpass filters for 160, it would be desirable to be able
I have a feeling that the radials are part of the problem, if they are run in any direction other than that of the Bev wire itself. If they are in a spoke arrangement, they are coupling in signals fr
I agree with Tom, and two practical examples come to mind. First the Pennant, which has a stated gain of MINUS 30 dBi, and the shielded loop (SLOOP) which is also a loser gain wise. Fact is the noise
With the variables due to ground condition changing as the ground conditions change ( at least in my geographical area...the ground can be dry as a bone and cracked, and the next day be soaked with 5
Worked the boys on first call on 160 this morning (dumb luck). Missed them on 80 because my TX antenna had a fault that must have appeared weeks ago, and I didn't bother to ring it out previously ( j
Some one was asking about marking or otherwise making low wires more visible to avoid collisions etc. A few of the methods used here may be of interest. Our biggest problem is the downlead portion of
Just wanted to show the incredible motor units that I'm using in the remote tuner project. These came from the Antenna Phasor at '4RJ and drove the massive roller inductors and vac caps. He had the t
Winding Beverage RX Balun de K0FF Today a friend decided to run a receive Beverage on 160 and asked me to make a transformer for him. The results are in these pictures: http://homepages.dstream.net/K
It was a beautiful day here in Northeast Missouri, or so I've been told. I spent the day in the basement workshop winding coils for receive antennas. Tommy, WD4K is experimenting with some Pennants,
Has anyone else noticed that on the same day that 160 is particularly good in the evening, that 2M and up have extended conditions due to tropo in the morning ?. Not reading anything into it, but hav
The K0FF Loop kit is now available at: http://homepages.dstream.net/K0FF/ForSaleStuff/LoopPartsKit.rtf For the time being I've put the Beverage and Pennant transformers there too. As soon as time all
balun? Bob, I use so many different types of boxes there is no one answer. The largest outdoor boxes are Hoffman NEMA 12, steel and with a gasketed door. Also use a lot of fiberglass boxes with a hi
Well after much head scratching and test winding of various people's ideas of matching transformers for Beverages, Loop, Flags Pennants and just about everything else, I've personally decided on a st