Quite a bit of the radiation from 5/8 wave verticals is at relatively high elevation angles - above 40 degrees elevation. (Perhaps useful for VHF mobiles that need to hit mountain top or hill-top rep
Hi Herb. I'll bet that 1/2 wave sloper worked great! When this thread got started, I modeled several verticals in EZNEC from 1/4 wave to 5/8 wave in height. I sent the plots around to folks that were
??? --Original Message-- From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Richard Fry Sent: Friday, September 27, 2013 7:27 PM To: topband@contesting.com Subject: Topband: 5/8 wavel
Hi, Herb I would think that 2-3 of those 500 pF caps in series would be just fine! Have you tried just one? Also, are those capacitors on the load side of the tuner as an aid in matching really low i
Hi, Bill In your first post, you indicated that min VSWR was 2.9:1 at 1833 KHz, indicating that the system was resonant exactly where you wanted I to be. Could I respectfully suggest that at 1.8 MHz,
10-fo' !! :-) All what work at the antenna? Just add a 2400 pF shunt capacitor and adjust the length of the antenna for resonance? Works perfectly on my vertical. Rick N6RK _________________ Topband
FB, Bill! Good afternoon all...and a good one it is. I won't bore y'all with the fine details, but will say that here are the final results: Vert lgth: 55 ft Total lgth: 137.5 ft C-P wires (4 @ 9' hi
I expect that needs to be a good quality and seriously heavy duty switch that's used to vary the configuration of the matching network - at least at full power! Thanks, Tom! Charlie, K4OTV wants to s
Hi, Jim In my experience, the answer is "no" to both questions - although a full size inverted L , while being a very effective transmit antenna can be a really noisy receive antenna. Can you go out
Good luck, Jim!! BTW I've worked some good stuff all round the world on 160 with a 70 foot tall Inv L with two elevated radials that ran along my lot lines. For receiving, the 'KAZ" terminated loop i
Hi, Bruce Well, the KAZ antenna is named for Neil Kazaross one of the original designers that optimized the terminated delta loop for MW broadcast reception. The 10' X 40' K KAZ that I threw together
Hi, Carsten You might try it with just a series C into the 3/8 wave on 80m. The VSWR may not be that bad! Then you could always add a 4:1 balun or transformer if needed. 73, Charlie, K4OTV Hi, I am p
I liked the idea of the ceramic based knife switch! That ought to take most anything us hams could throw at it at pretty much any VSWR! :-) Charlie, K4OTV The rub with any of this is the contact-to-c
BTW, Bill, amplitude modulation and "mixing" are the same process mathematically. In a "mixer" we just select one of the "sidebands" -depending on whether we are doing "up-conversion" or "down-conver
Well, might work. Another idea though, check with Fair-Rite - I believe that they have some cores that wil fit over .405 RG-8, and I know they have lots that sill fit over RG-58 or RG-8X. If you don'
That would work as well. I used something similar, but with less turns to precede the 4:1 current balun feeding the drivers on my home brew 5-band quad. Charlie, K4OTV --Original Message-- From: Topb
What "works flawlessly", Randy? The link? J 73, Charlie, K4OTV From: Randy Lake [mailto:randyn1kwf@gmail.com] Sent: Thursday, October 24, 2013 7:51 PM To: Charlie Cunningham Cc: Jim Bennett; Gary@ka1
Just teasin' you, Randy! J I think the snap-ons would be quick, simple and very effective and should outlast the antenna, I expect! I am sorry! That was not very clear. The info on chokes worked wond
True! Gary, The W2AU balun he was happy with isn't a balun at all...it basically has NO common mode suppression. The impedance of a few turns of coax is also next to nothing on 80 meters, but almost