I have been told by others, (treat as hearsay), that for AM broadcasts the 5/8 wave produces a pattern with destructive interference between skywave and groundwave at medium distances at revenue-impo
They were real easy on 80CW a few nights ago, right around sundown. Tim N3QE Well, I don't have a 160 transmit antenna at present time, but I do still have the 80m GP. Might give them a try there. I
I modeled my "Marconi T" antenna using EZNEC, got complex impedance parameters at feedpoint, plugged these into the L-network calculator that Tom mentions to find an L-network design, made an air-wou
I think the British word "trunking" is what we in the US would call "cable tray", metal trays with removable metal lids. Cable tray is very nice for cable management. Solid bottom galvanized cable tr
Last night on 160M condx seemed super good, SV2RF coming in as loud as ever and TO2TT often way above the noise. And KG4HF giving me a near instant LOTW confirmation from Guantanamo. Tim Can't wait!
Very interesting! I remember seeing transposition blocks at hamfests when I was a kid but I didn't know what they were at the time. Looking up some old patents, e.g. http://www.google.com/patents/US2
I do not know of any analog optical coupling technology that has nearly the dynamic range of copper. 50dB is considered quite good HF dynamic range for completely sealed analog optocouplers. Start pu
CATV analog modulation video over fiber has a typical 50dB dynamic range. See e.g. http://www.emcore.com/wp-content/uploads/Medallion-6000-Series.pdf Tim N3QE Um, no... Not really -- you do NOT need
I have a homemade K9AY loop with the classic diode setup to pick direction remotely. Unlike the classic switching scheme with Bias-T's, I use isolation transformers at both ends to couple switching v
I think you raise a good point Tom. I know I have some RF in the shack especially when running the amplifier on 10M which has been happening a lot the past few months. The computer sometimes reboots
The antenna end of mine, looks very similar to PG0A/PA3FYM implementation, drawn at http://remco.org/wordpress/wp-content/uploads/2008/01/pg0a-k9ay-small.jpg Uses an isolation transformer (not an aut
Is there a better way to use an isolation transformer to couple relay control voltages over the coax? Or is it as simple as, Bias-T's are always best, and there's no good way to do it with a transfor
High pressure contacts, I feel fine getting slathering dielectric grease all over them before making the connection. Examples are like a Battery terminal in a car, or a spade lug under a screw, or th
I have extensively used N1MM inside a "Virtualbox" VM emulator on Linux. I don't think it'll ever work in Wine. I heartily recommend N1MM. Tim N3QE It would make sense to raise this on n1mmlogger@yah
I had rearranged and cleaned up some untidy switch box cables Friday afternoon. But I had neglected to hook things up right. As a result, a few hours before the test started, I made several QSO's in
I am an alligator since adding an amp to my station and need to improve 160M receive abilities. I have a very odd shaped suburban lot but I do have a quarter wavelength on 160M available in roughly t
I spent almost all of the second night of the ARRL 160 test, just running, little to no S&P. This probably shows up in my final score as a high QSO count but comparatively low mult count. I certainly
After CQ WW CW, I was talking with a guy in Arizona who had worked 100+ JA's on 160 in that test! More than half a continent away, very different perspective on 160 than mine! Tim N3QE Come out to Co
I found it very educational when setting up my K9AY loop, to listen to the PT0S pileups. It's what convinced me that I had done it "right" in building the K9AY. Remote direction selection on the ante
I have used the K3 noise blanker in several different environments, sometimes with great success, sometimes with less success. I know the word "null", which many will take to be a subtractive linear