Check with Cushcraft to see if the traps are the same as the A4. If so, maybe you could make an A4 out of it. Dave Hachadorian, K6LL Yuma, Arizona K6LL@despammed.com months old with a slightly the bo
Author: Jim White" <k4oj@tampabay.rr.com (Jim White)
Date: Thu, 18 Apr 2002 18:59:51 -0400
Steve, Being realistic it ain't that they, the ham dealers, are uninformed - they make money selling what they sell - not what they don't...in a nutshell this is the beauty of discussion groups like
Wow, Henry, thats a hard act to follow. I am 36 years old, have an EE degree, and am still struggling to get my homebrew radios to work :) With regard to public exposure of ham radio, Tree, N6TR and
Nice post Henry, I can relate to some of what you pointed out. Particularly the unfriendly club members. I have two friends who have wanted to be hams since they were kids: one is 60 and one is 68. T
There were lots of replies. Some marked private which is OK. Some good threads came out that were not fully touched on but then, this isn't a book! kids and lids: I knoe from experience how hard it i
Author: Jim White" <k4oj@tampabay.rr.com (Jim White)
Date: Mon, 1 Apr 2002 10:14:45 -0500
so, you are saying that a wrap of tape coated with Scotchkote to seal it followed by a UV shielding protective wrap of 88 is overkill, now? what is amazing to me is the number of guys who appear to b
Hi Jim, That stacking method has been used for VHF antennas and only works in the "free space" that VHF and UHF antennas see many wavelengths above ground. At HF, the ground reflection is important a
To continue the aircraft parallel, aircraft are designed to withstand many positive and negative Gs, as well as wind loads, so their members end up being tremendously stiff compared to antenna elemen
They do - that's why manufacturers used to recommend rope in the elements to dampen the vibes. Force 12 has eliminated the low windspeed vibrations by using an aggessive element taper so they don't n
Author: w7ni@easystreet.com (Stan or Patricia Griffiths)
Date: Mon, 11 Feb 2002 22:39:00 -0800
In my opinion, if you inspect your aluminum tower and find cracks in it and have to take it down, it HAS failed. The consequences aren't quite as bad as if it FALLS down . . . but if it fell down, a
To be very technical airplanes are work hardening and stress cracking and breaking down that is why there is a maximum hour limit on the airframe. The antenna is work hardening too, but the cost of i
They do, if allowed to flex often enough! I lost more than one element tip (on a commercial antenna) before I learned the "rope trick" years ago. ____________________________________________________
Depending on the aircraft, the typical alloys you find are the garden variety 6061-T6, 2024-T3, etc. Certainly nothing more exotic than 7075-T6. 6061-T6 is the most common structural aluminum manufac
Eh? The Black Diamond autolocking carabiners I use on my climbing rigs are rated at 25 KN (Kilonewtons) breaking strength. The ratings are stamped on the caribiner, so it's easy to check. One KN = 22
Even if I acknowledged that the aluminum caribiners should be strong enough, there are other problems associated with using aluminum 'biners on a steel tower. One is that they will wear badly as alum
What was the orientation of the antenna for VSWR testing? Resting that antenna with the reflector on the ground and pointing the antenna straight-up is perfectly adaquate for testing purposes, althou
Hey Guys, I have attempted to refurb an old TA-33-JR, and today I finally took the antenna up the house for a test run The SWR on 20 meters was 1:1. 10 and 15 meter SWR were high to the tune of 2.5:1
I lived in a CCR neighborhood for 5 years in Denver. I put up a few outdoor antennas, like J pole and a ground mounted vertical, no one complained. Then I put a AEA Isoloop on the roof and 10 meters
Author: VE6JY Don Moman" <ve6jy@freenet.edmonton.ab.ca (VE6JY Don Moman)
Date: Sat, 3 Nov 2001 04:18:02 -0000
Direction readout on HB rotors: The video camera is the way to go. I had several up for 3 years outside in the weather down to -40 degrees with no problems. They are normally left on 24/7 and they ge
I donot know how things would perform in the outsied environment, but. I understand some of the video comeras for computers are very inexpensive, say about US$25 or so? I like the suggestion to put t