Epson manual MFJ-1278B MULTI-MODE Basic Operation Tuning Indicator

MFJ-1278B MULTI-MODE BASIC OPERATION

Note: If BUFTIME is a non-zero value, MFJ-1278B will automatically release the PTT line and revert to the receive mode between repeats. This allows you to monitor the frequency for any replies to your message. If the MFJ-1278B is not interrupted during the pre-set delay time, it will continually repeat until buffer 0 is interrupted.

TUNING INDICATOR

Your MFJ-1278B comes equipped with a very accurate and sensitive tuning indicator. The tuning indicator is extremely useful not only for tuning to signals for optimum reception, but also for filter alignment and audio level indication.

The position of the tuning indicator LED is only meaningful for tuning a signal under the following conditions:

1.The station is transmitting data (both tones NOT just a single carrier).

2.The DCD LED is lit indicating that the signal is within the capture range of the PLL demodulator.

3.That there is sufficient audio output from the receiver for proper operation of the demodulator.

If the conditions above are met, tuning in a station with the tuning indicator is quite simple. Just set the receiver frequency so that the tuning indicator LED is centered in the display. Actually there are 2 LEDs which represent the center of the display. Either or both may be used. The use of the tuning indicator will be further discussed later in each mode of operation.