It is my pleasure to inform that today, 25th of January, I run complete and successful test of the FM stereo rig Zagros Mark III.
-- Main unit ordered from diy-electronics.com (model FM008) with the IC based 500 mW RF amplifier (same source).
-- Minimal half-wave dipole (2 * 75cm) on the 75 ohm cable and BNC connectors, installed indoor at the side of the bookshelf, at the third floor of the stone-made building (block #2 in Prosfygika).The antenna was not optimised, tuned nor balanced.
-- Internal power from an alkaline 9V battery
-- External power from a 12V acid-lead battery via L7812cv stabilisator. 12V is maximum nominal voltage accepted by the rig.
-- Sound source: laptop audio card through male-male stereo cable.
-- Nokia 101 with headphones
-- Simple analog battery handheld radio (telescopic antenna).
Starting at 95.65 MHz, the transmitter later drifted to 95.8 MHz
On internal power, the reception was limite to direct line of sight of the flat windows (both sides), with some reflected signal vailable in front of block #1 and behind block #3. Handheld radio was more sensitive, but also was easier to be confused by interfering stations.
On external power the reception was better in the first area, except for some blind spots (due to antenna location). Reception was arratic between block #3 and in front of #1. Some reflected signal was received at the stairs behind block #4 and by the steel fence of the hospital (steel rail and fence probably providing some secondary resonance).
During the weekend I plan to run more tests, using outdoors GP omnidirectional antenna and directional halfmoon dipole (ready made).
It works. We have the installation that can possibly (with good antenna and possibly some 2-5 Watt boosters) provide all functionality we plan for or radio products.
After successful weekend tests I will proceed to start making presentations and raising investment funds.
Tomorrow I will provide pictures of the installation.