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Tech Smorgasbord Archives - 35

These items are an archive of past Topical Smorgasbord items that have appeared on the RF Cafe homepage. In keeping with the "cafe" genre, these tidbits of information are truly a smorgasbord of topics. They all pertain to topics that are related to the general engineering and science theme of RF Cafe. Note: There is also a huge collection of my 'Factoids' (aka 'Kirt's Cogitations') that might interest you as well.

| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 |

Breaking News: The Arctic Icebergs Are Melting - circa 1922!

Breaking News: The Arctic Icebergs Are Melting - circa 1922!, Kirt's Cogitation #289 - RF CafeWe have all been treated to a seemingly endless series of headlines portending rising ocean levels and the ensuing drowning of costal cities due to melting ice in the polar regions. This phenomenon ostensibly is brought on by the exponential increase in carbon emissions from developing third-world countries as well as established first-world countries in the post World War II era ... or was it post Vietnam, or maybe post Gulf War? The reference keeps changing, but it definitely began occurring since at least 1990, right? There is a problem, though. In the early and mid 1970s climate scientists began warning us of an approaching ...

8/9/2017

MIA: The Other Half of the Antenna and Cable Loss Equation

The Other Half of the Antenna and Cable Loss Equation, Kirt's Cogitation #288 - RF CafeFor some inexplicable reason, it seems that of the many articles I read dealing with antenna and feedline efficiencies, rarely is the receive side of the equation addressed. Yes, transmit power is expensive and there is a legitimate reason to reduce losses when converting power amplifier output to in-the-air power, especially for DX operations. However, it doesn't do much good to launch the full permissible 1,500 watts PEP and make a contact on the other side of the world if your system cannot receive a reply because of the excessive line loss and/or mismatch loss between your antenna and your receiver. Antennas and feedlines are reciprocal elements so if ...

7/26/2017

A Radio Shack Eulogy

A Radio Shack Eulogy - RF CafeFriends, former employees, and fellow lovers of all things electronic, we are gathered here today to remember and honor our lifelong friend and enabler of our hobby and passion, Radio Shack - once a Tandy company, as we are familiar with it. Radio Shack has lingered in failing health for a decade, all the time keeping a brave face on its dwindling number of stores. Caretakers attempted a variety of infusions and transplants in an attempt to save the American stalwart electronics retailer. Alas, a confluence of poor management ...

6/14/2017

1930 U.S. Census - Do You Own a Radio?

1930 U.S. Census - Do You Own a Radio?, Kirt's Cogitation #286 - RF CafeFor Mother's Day this year, the kids and I got Melanie a 23andMe DNA testing kit. She has spent a fair amount of time over the years researching the family lineage which, in case you care, traces back primarily to Germany and Switzerland. Along with some of the online ancestry websites, she searched the U.S. Census database for immigration and early American household information (number of people, ages, names, occupations, etc.) The entire 1930 Census form consisted of a single page seeking basic information on whether you own or rent, value of the home, live on a farm or not, color or race, ...

6/9/2017

Heathkit DX-60B Amateur Radio Transmitter Restoration

Heathkit DX-60B Amateur Radio Transmitter Restoration by Gary Steinhour, Kirt's Cogitation #285 - RF CafeLong-time RF Cafe visitor and occasional contributor Gary Steinhour, KF6U, recently sent me a note saying he had acquired a very used Heathkit DX-60B amateur radio transmitter and was in the process of restoring it. Gary's first transmitter as a freshly minted Ham over 50 years ago was a DX-60, so this was an effort to satisfy a nostalgic emotional attachment. The project is complete now, and boy does it look nice! Gary provides a brief account here ...

6/7/2017

Lightning Protection Systems

Lightning Protection Systems, Kirt's Cogitation #284 - RF CafeIf you have ever seen the result of a lightning strike on electronic equipment, then you know how devastating it can be - often total destruction that includes molten metal. Woe be unto any human operator who happens to be in contact with it at the time of the strike. Unprotected antennas are begging for contact. Shortly after leaving a company where I worked on a Tx/Rx system for a phased array weather radar I got word that the indoor equipment rack took a major hit because the guy who maintained the site forgot to reconnect a lightning rod system cable after moving it during ...

6/1/2017

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