Savel brain dump in English!

I was testing radio link in our city and with mine country house. The testing transceiver was Kenwood TK-760G-1. I am a bit disappointed with the quality of radio link.

The frequency of radio is about 132? ~ 174 MHz. The output power is up to 25W. The transceiver was in high power mode and the antenna burned the hand quite well. The output stage of the radio is built using Mitsubishi RF module M67741H. The output power of the module in 150 … 175 band range is 35W when powered from 12.5V PSU. Inside the module there are two transistors (or maybe amps) and few passive elements. According to diagrams in datasheet, the module maybe can be used in FM band with transmitter like Veronica.

I was using simple quarter wavelength antennas. The link quality was poor. Even when I attached special external antenna placed on the roof. Meanwhile the radio link using old soviet transmitter was ideal. Ant the output power of Маяк (164MHz) transceiver is only 10…15W. Maybe the reason of it is the sensitivity of receiver? Bur in old radio it is about 0.4 … 0.8μV, while kenwood states 0.25 … 0.33μV. It is strange.

One more interesting moment- old soviet transmitter can be tuned to 0.2μV sensitivity and up to 50W (!) output power without changing components.

Now I need to reprogram Kenwood to other bands and test again. Maybe the used frequency is jammed? I soldered RS232 to TTL converter with MAX232 chip. Also found special software in the internet. While programing I receive “-PC-” on transceiver display and lot of errors on PC. Someone told, that kenwood PC link is very lame and I need to use old PC and exact cable like original one from kenwood. Damn capitalists- they use lame hardware to make user to buy original cables. Hundreds of dollars for fucking few transistor cable…

This Lithuania only blog entry. Just about that I found lots of wild hemp growing near my horse house. And my dog just tore the pillow.

Cannabis sativa, also known as hemp, is a species of Cannabis. It is a dioecious, annual herb. It has been used by humans throughout recorded history for its fiber, for its psychological and physiological potential as a source of drug material, and for the nourishment and oil of its seeds.

Mad dog

Due to some national holidays we had four free days. Ant the mother nature decided to show us some heat. In the shady spot it was about 30°c, ant the thermometers on the sunny side were “overloaded”.

Reader must understand, that Lithuania is quite cold country. The 22°C temperature is called “hot”. And quite rainy. So such hot is rare and dangerous. Ant it is wet hot. The hygrometer placed inside the “sealed” house is showing more than 80% of humidity.

And now some reminiscences from some not very old times, January 20, same year. This image is from Henkas blog and is about five months old:

In short- about 70 degrees of temperature swing.