Friday, August 18, 2017
Above was my 1st computer in January 1981
The Sinclair ZX81 was a home computer released in 1981 by Sinclair Research. It was the follow-up to the Sinclair ZX80.The machine's distinctive appearance was the work of industrial designer Rick Dickinson. Video output, as in the ZX80, was to a television set, and saving and loading programs was via an ordinary home audio tape recorder to audio cassette. Like its predecessor it used a membrane keyboard. Timex Corporation manufactured kits as well as assembled machines for Sinclair Research. In the United States a version with double the RAM and an NTSC television standard was marketed as the Timex Sinclair
Thursday, August 17, 2017
Camp David is the country retreat of the President of the United States. It is located in wooded hills of Catoctin Mountain Park near Thurmont, Maryland, about 62 miles (100 km) north-northwest of Washington, D.C.. It is officially known as the Naval Support Facility Thurmont, because it is technically a military installation, and staffing is primarily provided by the United States Navy and the United States Marine Corps.
Everything you ever wanted to know about Camp David.
From Wikipedia, the free encyclopedia
Monday, August 14, 2017
Sunday, August 13, 2017
There is always something new to try in Ham Radio one being MSPR (Weak Signal Propagation Reporter). Actually MSPR is not new I dabbled with it about five years ago not pursuing at any great length, other things were on my mind. My new interest came about after seeing a very small low power transmitter advertised. It transmits on 20 and 30 meters out of the box. Others bands can be added by adding a filter that comes in kit form. The wheels turned and the 30 meter vertical antenna that was not being used could work very well with this unit. It was ordered and in a very short time delivered. It does not come with a few adapters but luckily I had them in my junk box. It was assembled and connected to the antenna then powered on. It requires only 5 volts coming from a charger for a cell phone or a battery through a USB cable. The RF output is only 200Mw or less. This is 2 tenths of one watt. This is extremely low power. A computer, tablet, or smart phone enables you to see who is receiving the signal. The first time I brought up the web page I was totally amazed. My 200Mw signal on 30 meters was being received by other Hams hundreds of miles away. Later that night when conditions were better the signal made it all the way to New Zealand, some 8,218 miles away, this was almost unbelievable to me. keeping an eye on the distance being covered it has been received even further to Australia and many countries in Europe. By hooking it to various antennas you can judge the efficiency and directivity also the best times of day or night to use your other transmit modes such as SSB. All and all a not only fun gadget but a very useful one.
See a Youtube video about MSPR
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