You can probably model it, Pete. Just put in a wire (or series of wire segments) in where the coax shield runs, run NEC, and see how much current shows up on this "coax shield simulation" wire. You c
Not sure who has the best pricing, Dick. Here is the manufacture's list of distributors: http://www.fair-rite.com/support.htm I have heard very bad things about Amidon's current management and especi
Very good advice, Jim. This is a "must have" document if your working with ferrites. 73 de Mike, W4EF _______________________________________________ See: http://www.mscomputer.com for "Self Supporti
When I was in college, I worked for the physics department. We were fabricating adiabatic light pipes out of acrylic. Before we went to laser cutting, we would saw cut the acrylic, sand it, and then
I saw a documentary recently on the Grand Coulee Dam in Eastern Washington. When they built it, they were pouring concrete 24/7 with 13 ton hoppers for something like a year to get the dam finished.
Quite right, Jim. I did some tests on an FT-1000D and it was pretty accurate above S-5 (4 to 6 dB/S-unit) and very accurate above S9. Below S5 it fell apart. Mike, W4EF...............................
Don't be ashamed of buying stuff, people. I just paid $65 for a tuning pulser. I haven't taken the cover off, but odds are that its nothing more than a relaxation oscillator and a rotary switch (to c
Using tools like TA has anyone compared the effects of very close-in terrain to distant horizon clutter. Specifically which would be more detrimental to take-off angle, an HF antenna mounted directly
Hey, while we are on the subject, how about gamma matched yagis. I have a friend who swears by using a gamma match on his yagis with no feedline choke. Seems to me that this is a great way to add som
Yes, I suspect you are right, Tom. It will be interesting to see if changing the feed to one with better balance will make our 10 meter antenna any quieter. Too bad its stacked above two other big ya
Jim, When you do that calculation for a 1/4 ground mounted vertical, what do you use for the effective height when doing the ray trace for the distance to the reflection zone? I posed that question o
any difference at all whether the wires are insulated or not. One consideration that I haven't heard discussed with regard to radials, however, is lightning protection. Wouldn't it be better from a
FWIW, the MFJ-269 uses 12bit A/D's and displays impedance up to 1500 ohms. I haven't sat down a real careful comparison (e.g. calculating percentage error), but the MFJ-269 seems to produce readings
and respectively. Sylvan, on what band were you listening in this case? And when you were listening on the 14AVQ what was the noise level when you weren't transmitting? Sounds like you have a sneak p
<<If I tx @ 100W on 10m and rx on 15/20/40 the noise in the rx is 4/4/0 S units with and without the stubs in the tx feedline>> perhaps you meant to say "4/0/0" or you changed the meaning of the sequ
Actually a 40ft R25 tower bracketed at 8' would probably handle 130 MPH with no antennas installed. When I ran the calcs for my 34ft R25 tower bracketed at 8', it came out to 150 MPH wind survival (6
Hank, I just rechecked my calculations and I found an error. I used 2 sqft/section instead of 2.9 sqft/section (I was going from memory). According to my updated numbers this derates things down to a
on computer DOS I had the same problem with my Windows XP machine, John. I ended up running my K6STI programs on my spare Windows 98 machine as that was the easiest fix for me. Another possible solut
KT-34XA? Bob, Here is some data that I took a few years ago when I was rebuilding one of those beasts along with data that Mike Stahl K6MYC sent me from his KLM design notebook (Mike designed the KT3
Has anyone on the list attempted to wind torque balance a KLM KT34XA? I just went thru the numbers and my calculations show that the KT34XA should be a great weather vane. The factory specs show that