Personally for the money i found this the best damned 6mhz bandwidth 11m antenna i ever used.
its only slightly bettered by the A99/I MAX 2000 , but they cost so much more
Would some explain to me how adding/subtracting radials = 50 ohms?
I thought they only made a vertical more efficient. Efficient does not mean 50 ohms.
Fuzzy
Someone asked, "I am actually curious as to the goals the op is attempting to achieve with this thread. Why do we need a 6Mhz bandwidth at HF frequencies?"
Here are a few:
1. At this bandwidth, you have both an 11M and 10M antenna. Saves money for the manufacturer AND for those ops that operate in both bands.
2. With this bandwidth, it is likely that no re-tuning would be needed. It would work "right out of the box." That saves the recipient time/money. It saves the manufacturer service time trying to help a customer set up the antenna.
3. What you learn in making a 6 MHz antenna for 10M should be directly transferrable to, say an 80 M antenna where a 20% bandwidth allows ONE antenna to be used on low end CW and all the way up to the Nets near 4.0 MHz without needing a tuner. Super easy QSY.
4. If the 6 MHz 10M antenna is of reasonable size, then a "shrunk" version with reduced bandwidth might allow full operation on 10M in physical environments where a "standard" antenna won't fit.
Of course, conventional wisdom says the above is not possible.
Conventional wisdom is sometimes not completely accurate.
73
Bill
OK, not necessarily bad answers. One more question.
Is such a benefit really worth the sacrifices that have to be made in order to achieve it? Of course only the individual who has the need can truly answer that one. Just remember everything is a tradeoff, including extreme bandwidth. [The DB
Best DX so far UK to Brasil.
Of course only the individual who has the need can truly answer that one.
waverider said:DX does not mean nothing when it comes to antennas.
OK, not necessarily bad answers. One more question.
Is such a benefit really worth the sacrifices that have to be made in order to achieve it? Of course only the individual who has the need can truly answer that one. Just remember everything is a tradeoff, including extreme bandwidth.
The DB
1DBI gain modeled in free space.?????
Negative gain in the real world.
All the information you are asking/seeking is in any antenna handbook.
Look at the Cushcraft R8000 antenna. Single vertical radiating element in the center with one trap if I remember correctly, the rest is just basically parasitic rods mutually coupling off the radiating element. 6 meters to 40 meters.
What you are attempting is nothing new, it has been R&D and distributed.
Now if you can get a vertical with 1.5DBD gain that covers 6mhz in the upper HF region then you will have something. Collinear 5/8 wl vertical?
The IMAX2000 will work 21mhz to 29 mhz with acceptable VSWR on the ham/cb bands. Cost of this vertical dummy load shipped to the door is around $100 plus or minus a few $$.
DX? I have worked Japan from Florida with this IMAX2000 vertical on 15 meters. DX does not mean nothing when it comes to antennas.
Well not necessarily. The Hustler G6 144B / 2 meter Base antenna offered in the original example presents 6 mhz bandwidth AND 6 db gain. This heavy duty repeater grade antenna has been around for decades. Are you sneezing at 6 db gain? Here we have "extreme bandwidth" and excellent gain.
So you are using the 2 Meter band to compare bandwidth to 10/11 Meters? OK, lets do some simple math...
You point has already been covered by discussion in this thread. No need to repeat yourself. I am not disputing this.
I have no quarrel with your statement that it is a great antenna for 2 Meter radio.
Well that's good. Because that's what it is.
Long story short, the referenced antenna that is likely a very good 2 Meter antenna. However after scaling it to HF we find it isn't the miracle in bandwidth you seem to think it is, not even close.
Never said it was. That is apples and oranges.
Also, find out what that 6db is in relation to. Not including what it is in relation to doesn't tell me much. Unless I am told otherwise I like to assume that that it is being compared to a dummy load.
No, YOU find out what that is referenced to if it bothers you. Your argument may be with the Hustler Company and not me.
The DB