Ramsey Electronics FZ-146 Specifications download pdf (Page 38)

FX 146 • 38

FX-146 PROGRAMMING SUMMARY

Programming your FX-146 is really quite simple; all it takes is a clear mind, a

scratch pad and a calculator. In closing, let's find the proper N value for a

common NOAA weather channel, 162.55 MHz.

First, find N: 162550 ÷ 5 = 32,510 Then, convert to binary:

Can we subtract 32,768? NO

Can we subtract 16,384? YES 32,510 - 16,384 = 16,126

Can we subtract 8,192? YES 16,126 - 8,192 = 7,934

Can we subtract 4,096? YES 7,934 - 4,096 = 3,838

Can we subtract 2,048? YES 3,838 - 2,048 = 1,790

Can we subtract 1,024? YES 1,790 - 1,024 = 766

Can we subtract 512? YES 766 - 512 = 254

Can we subtract 256? NO

Can we subtract 128? YES 254 - 128 = 126

Can we subtract 64? YES 126 - 64 = 62

Can we subtract 32? YES 62 - 32 = 30

Can we subtract 16? YES 30 - 16 = 14

Can we subtract 8? YES 14 - 8 = 6

Can we subtract 4? YES 6 - 4 = 2

Can we subtract 2? YES 2 - 2 = 0

Can we subtract 1? NO

We're done! Install diodes in all YES positions, and no diodes elsewhere.

BASICS OF EXTERNALLY CONTROLLED FX-TRANSCEIVER

FREQUENCY SWITCHING

The 12 front panel switched channels, with never a need for a crystal will

cover most applications generously. Yet many of us will want to figure out

ways for easy frequency-programming of still more channels, especially if we

do a lot of cross-country travel. Rather than endorse or illustrate any

particular scheme, of which there are dozens if not hundreds, we provide

here the most basic schematic information needed to set up any kind of

auxiliary switching correctly. The principles and requirements remain the

same whether you use DIP switches, toggle or slide switches, electronic

latching or go all out to build the mother of all diode matrixes. Make sure

whatever you build resembles electrically the diagram on the page 39.

Some DO's and DON'Ts of FX-Transceiver Add-Ons:

1. DO study and understand the basic switching diagram.

2. DO let your ingenuity run wild to come up with the neatest, most cost-

effective scheme.

3. Please DON'T ask our technicians to talk you through your own idea.

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Ramsey Electronics FZ-146 Specifications Page 38