Ramsey Electronics BS1 Instrukcja Obsługi Pobierz pdf (Strona 24)

SG7• 24

is important for several reasons. If it is damaged, your project will be on

hold until you can get a replacement from us. Also, lead wires MUST be

kept as short as possible - and its cathode end is soldered very near the

SMT chip capacitor. Its glass body is very fragile, so be careful!

 17b. After considering the concerns in step 17a., carefully install diode D2,

making sure the banded (cathode) end is toward C7.

CONGRATULATIONS! You have completed construction of a 2.6GHz.

microstrip oscillator. It is ready for its shielding cover, but - DO NOT install the

cover until completing several voltage tests explained below.

The following tests require completion of the SG7 Speed Readout circuit board,

correct preparation of the 2-conductor shielded cable set, and a reliable 12 volt,

200 ma minimum power source:

 1. First, make sure that the voltage to the Speed Readout unit is a healthy

12-13 volts, not "10 or 11 volts or so". You will NOT get acceptable

readings with a lower supply voltage, and you cannot do anything else

useful with this PC board until it is enclosed and properly soldered to the

antenna housing.Verify the following voltages on the microwave oscillator

board:

 2. Strip DD: 8 volts DC

 3. Collector of Q1: about 3.7 volts

 4. Collector of Q2: about 6 volts (5.5 to 6.5 is OK)

 5. Base of Q2: 2.3 to 2.7 volts

Once you verify the above voltage readings, you can proceed to the section on

installing the shielding cover. Before doing so, take one last and critical look at

the quality of all solder points. And be VERY sure that there are no bits of wire

or solder tucked under a resistor or capacitor.

FORMING AND INSTALLING THE MICROWAVE OSCILLATOR

SHIELD:

If you are used to making your own metal chassis projects, just what to do with

the pre-cut oscillator cover will be obvious. Just get your bends going right from

the start - or you will have to reverse them and risk weakening and distorting

the bends. If you have never done something like this ever before, fear not. It's

an easy process and even shows the basics of how a sheet-metal "brake"

works. Such a metal brake is an even-pressure folding machine, whether used

to make electronic chassis or heating/air conditioning ductwork!

The idea is to fold the 4 "flaps" to a clean 90-degree angle from the "top" so that

the finished assembly makes a snug-fitting cover for the SG7B Microstrip

Oscillator Board. The cover goes over the component side of the PC board, so

that the shiny ground-plane side of the board and cover form a neat box, with

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Ramsey Electronics BS1 Instrukcja Obsługi Strona 24