By David, on August 7th, 2011%
Just some notes I made on a napkin while researching this, and thought I should capture it somewhere.
FB-102 and FB-124 have 1/2″ holes which are the right size for RG-8 Coax.
Mix 77 is better for 80/160 meters Mix 64 is better for the higher frequencies (10 meters and up?) Mix 43 is a good all-around general purpose mix
12 of the FB-77-1024 on a suitable length of RG-8 will have enough RF impedance along the outside of the shield to function as a good balun. Type 73 is actually recommended, but seemingly hard to find. Type 77 will work very well.
You’re welcome to share any . . .
To read the rest of this article, please click here: → Miscellaneous Notes About Ferrite Beads and Baluns
By David, on August 12th, 2010%
The Global Ionospheric World Map indicates the frequency in MHz at which a signal transmitted more or less straight up (about 70 – 90 degrees) will no longer bounce back to Earth, but rather escape out into space.
In short, this picture shows the Maximum Usable Frequency (MUF) for Near-Vertical Incident Skywave (NVIS) propagation.
NVIS is the mechanism for reliable HF communications within a region (500 mile radius). Without NVIS, there is a skip zone or dead zone where neither groundwave propagation nor skywave propagation are effective. This skip zone is often a band around the transmission site extending from between 20 miles (where groundwave leaves off) and . . .
To read the rest of this article, please click here: → Global Ionospheric World Map
By David, on August 9th, 2010%
Another off-topic post to the Elecraft reflector … sage advice on how to really learn CW. Too good to pass up, I wanted to capture it for my reference, and thought you’d like to see it too.
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As a long time high speed CW op, let me pass on an few of what I feel are the keys to learning to receive effortlessly at QRQ levels. The goal is to get to the point where listening to CW is exactly like listening to a conversation; that is, there is no conscious translation from dits and dahs into letters, words, and ultimately, phrases.
The first thing do to do . . .
To read the rest of this article, please click here: → Learning CW Tips
By David, on August 8th, 2010%
I follow the Elecraft email reflector — I find it to be a very good source of information. Yes, it’s mostly Elecraft equipment related, but every once in a while these guys go a little off-topic and manage to share some really good information of general interest.
Recently, such an off topic thread occurred. From it, a number of very good tips regarding CW operation came forth. One of the other reflector followers created this brief compilation. I’m including it here because I will no doubt refer to it many times in the future. Perhaps you’ll find it of value as well.
Enjoy!
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Hi All,
Below is a . . .
To read the rest of this article, please click here: → CW Tips Compilation
By David, on July 18th, 2010%
Table of Olivia Calling Frequencies and Olivia MFSK Activity Frequencies, as per existing bandplans. . . .
To read the rest of this article, please click here: → Olivia Calling Frequencies and Modes
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NASA Real-Time Solar Image
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