Ramsey Electronics FZ-146 Specifications download pdf (Page 118)

FX 146 • 118

Frequency Programming and Channel Switch Preparation

Before completing the transmit functions of this VHF FM transceiver, we

should now verify that the PLL Frequency Synthesizer gives performance as

desired and as designed. Regardless of whether you pursued the VCO/

receiving tests proposed as optional in the previous section, it is now time to

put your completed receiver section through its paces.

In order to do this, one or more receiving frequencies must be programmed

on the primary matrix. If you already have a firm plan for how you wish to

program some or all of the channel positions, you can proceed with making

the frequency programming lines that you are sure about. If you have little

or no sure idea of how you want to set up the channel selector switch, you

can build up a simple switching system that will let you try any frequency of

your choice.

 H43. If you are unsure of what frequencies to program, we suggest the

following to get started:

• Channel 1: 146.52 MHz Simplex (national calling frequency)

• Channel 2: One additional simplex frequency such as 146.55 MHz

• Channel 3: Main repeater of your local radio club

• Channel 4: One additional repeater in your area

• Channel 11: A popular packet frequency such as 145.01 MHz

• Channel 12: Your local NOAA weather station.

Add more channels as you become more familiar with 2 Meter band

operation in your area. You can change or delete any of these frequencies

whenever you wish.

 H44a. Construct at least two diode bridges for frequency programming

as illustrated.

 H44b. Install 2 or more diode bridges in the channel rows of your choice.

 H45. Install programming diodes for two or more channels per the

following guide or per your own calculations or our Quick-Reference

Chart:

'X' indicates the installation of a diode in that position. Each one of these

channels also requires a diode installed at the 'Simplex' position. Before

installing diodes, please be sure that you understand the principles of binary

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Ramsey Electronics FZ-146 Specifications Page 118