Into a 1 meg load. The static induced voltage would go much higher if there weren't a load, and an arrestor could fire. _______________________________________________ ______________________________
Take a regular nut, hold it up to the mirror. Reach into the mirror and grab the one in there! OK, enough out of me; McMaster has a full selection, but the wire method is more secure anyway. Locking
Anyone using a dipole 4-square array like the one at http://www.comteksystems.com/4square6.html and is anyone using a parasitic array of comparable design (4 v-dipoles hung off the tower, but with sh
In the spirit of "some antenna is better than no antenna at all," I'm going to add a base loading coil to for 160m to my 40 foot vertical (http://www.n3ox.net/projects/lowbandvert). I know it's a sub
Self supporting coils are a decent idea but I don't have the materials like I do with the PVC/wire coils. Also, the coil needs to be pretty dimensionally stable, which I think would require pretty su
Well, it seems from all the advice I've recieved that PVC is *marginal* as a coil form. I've gone and built the thing anyway; did it last night, but since I'm running low power and other system loss
"And 14.3 watts more than I can radiate on 160m" Yeah, if I find I can *hear* anything on 160 with this thing, I'll pursue more efficient loading schemes so I don't lose so much in the ground. Dan __
I hooked up the grey PVC base loading coil (30 turns #10 wire, 4.5inch diameter, 6TPI) to the 40 foot vertical today; it doesn't get warm at all at 100W keydown... no arcing, sparking, or other troub
I didn't see any but I made some 6m contacts via auroral scatter ;-) Dan _______________________________________________ _______________________________________________ TowerTalk mailing list TowerT
Putting a dummy load on the output of the feedline carrying DC and sweeping the whole frequency range of interest with an SWR analyzer will work fine. If the coil used has any series resonances on i
It's entirely possible that the directivity, and hence the RX ability, of the sloper (array?) was better than the K9AY. http://www.w8ji.com/receiving.htm 73, Dan ____________________________________
I don't know if this works or not but it seems like they'd get a bit upset if you cranked the tower up and down frequently . . . Dan _______________________________________________ __________________
It's time to do our part to bolster the copper industry and improve our radial fields. Dan _______________________________________________ _______________________________________________ TowerTalk ma
This is a problem with ferrite baluns if the choking impedance is too LOW. Maybe you had amps of RF current flowing on that coax, and you put a one ohm impedance in series with it. It's not enough t
Jerry, You get the "observant TowerTalker" award. Feeling dumb, Dan _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@co
I can see this on my little low band installation here. It's really only a problem if you have resonant conductors of the same polarization less than a wavelength from the antenna with the good patt
Jim Lux suggests: I dunno, that's what I did. Granted, I had a balcony with a roof to limit the amout of weatherproofing that I had to do, but the servo thing was cheap and fairly reliable, even thou
You see, IMD means Immense Metal Dipolehanger . . . in other words, a *tower* ;-) A third order intercept is when you've got three guys on the tower and you've been remiss in having your ground crew
It would (probably) add some phase shift to your tuned feeder system, and would probably require you to trim back to length at the shack end to get your impedance repeater back, but there's a trick t
Yet many of us are using autotuners (which all have powdered iron inductors) on pathological matching cases, probably with high circulating currents. There *is* a QRP-level trapped dipole (don't rem