Another source for plug-in replacements for the 1829 bulb is http://www.superbrightleds.com - Look for BA9 base bulbs in cool white, warm white, green or blue in 6, 12, or 28 AC/DC and 180 degree ill
Look up gamma matching a yagi boom for 40 meters. Both K4RO and N4KG have written articles on it over the years. N4KG's appeared in one of the ARRL antenna compendiums (I think), K4RO's info is on th
Don't even think of undermining the house. If you need to stick with the 15' pad.move the appropriate distance away from your foundation. The typical Florida home is slab on grade. Your area has enou
As long as the cables are connected tightly to the tower/tower leg and shields are bonded to the tower top and bottom, you are not likely to see any problem. K6SE used crank up towers with the cables
The changed resistor values in the RCS-12 source drivers are a patch. The issue is a basic design defect - the "pull up" resistor is on the "wrong side" of the base current limiting resistors which m
The issue is that customer service costs money. MFJ have priced themselves into a corner ... they can improve quality so their products are more reliable and require less service, they can increase p
On 2014-09-01 2:05 PM, Jim Brown wrote: As someone who has made a living in technical sales, I see another negative to their operation -- they pollute the market for products of moderate cost but bet
Ken, They don't do it for 25 years <G>. Start-ups generally succeed (as in the case of Dell, HP, etc.) and move to normalized cost accounting or they fail in a couple of years. 73, ... Joe, W4TV Unfo
Any matching network would be *very* sensitive to the length of the inverted L and ground quality. In all probability it will need to be "cut and try" for your specific antenna. 73, ... Joe, W4TV On
You might get lucky and be able to bring SWR on the high end of the bands down to a reasonable value just by tapping down on the antenna end of the coil (reducing the L). It will not be "perfect" bu
It scared me just to walk out onto the roof outside one of the transmitter rooms up there some 20 years ago. Work on the mast with that constant wind ... no thanks. 73, ... Joe, W4TV On 2014-09-15 4:
A good rule of thumb is to look up the stacking distance for the individual antenna (you do not provide enough information to know what they are) and place each antenna at least 1/2 the stacking dist
Look into one of the "multi-monoband" antennas like the Force 12 (www.force12inc.com) XR5-T or XR5-TC - two elements per band (20-10) on a 12 foot boom. See: http://www.force12inc.com/content/XR%20Se
Since 1/4 wave slopers use the *tower* as the ground return, you will almost certainly need a second common mode choke at the base of the tower. Any antenna current on the tower will be coupled to th
Choke any lines leaving the tower. Anything on/parallel to the tower is part of the antenna. 73, ... Joe, W4TV 3 of the lines go to a switch on the tower. Would a choke on the single line from the sw
But then a thought occurred to me. Might the take off angles of the wire antenna be different enough as to be beneficial for transmitting on those bands and hitting different spots of the globe that
CQ Marathon is a year long event, the more hours you operate the more countries you will work. I don't know that I would agree with "the more hours you operate the more countries you will work" as it
yagi.... both at 70 feet.At really low angles..say 0-10 deg..... will the 3-el yagi have even more than 5.2 db of gain ?? Or put another way... even though 70 feet = aprx 15 deg take off angle of ma
"back in the days" they also thought connecting one side of the A/C to chassis was a good idea, too. "Back in the day" it wasn't all that uncommon to get a "bite" from the microphone - another sympto
You're feeding a dummy load - it won't matter. With RG-8/RG-213 having ~ 1dB/100 ft at 30 MHz, the feedline alone has 500 dB(!) loss. 73, ... Joe, W4TV <snip> Any length of wire a multiple of a half