D1723GF datasheet(39/80 Pages) NEC

39 / 80 page

µPD1723GF-013, µPD1723GF-213

Function

Symbol

When the auto local function is used, each time the

key is pressed, the local

mode is switched as shown below.

LOCAL1

→ LOCAL2 → DX → auto memory stop

When the local mode is switched, the auto memory operation is repeated from the

frequency at which is started. When the auto memory operation was stopped, if even one

broadcast station was written, operation shifts automatically from the preset memory

when the auto memory operation started to preset scan operation.

Autotuning (seek operation) key.

The frequencies are incremented (

key) or decremented (

key) in

1 channel space and whether or not there is a broadcast station (IF count and SD signal) is

detected at each receiving frequency and when there is a broadcast station, that frequency is

held.

On the VF band, when there is judged to be a broadcast station by IF count and SD signal, the

SK switch is checked 250 to 375 ms later and if there is an SK signal, that frequency is held.

When seek up (seek down) reaches the highest (lowest) frequency, it returns to the lowest

(highest) frequency and, that is, sawtooth wave mode tuning is performed.

The channel seek up (seek down) operation is shown below:

SEEK UP

SEEK DWN

Seek Up

Seek Down

When band switching is performed during the seek operation (no broadcast station), when

switching returns to the same band and when the radio is turned off (including mode

switching) and then turned back on, the frequency at which seek started is received.

The keys that are valid during the seek operation are shown in the following table.

Keys that are not shown are invalid. (

key is valid.)

When using the

and

keys, set the AUTO500 switch (diode matrix)

to 0.

POWER

SEEK UP

SEEK DWN

PSCAN

AMEMO

SEEK UP

SEEK DWN

Start

Stop

Start

For the S (slow) and F (fast) IF count conditions, see the FMIF pin and AMIF pin above.

For the 1 channel space frequency width, see the receiving frequencies above.

PSCAN

AMEMO

D1723GF Datasheet(PDF) 39 Page - NEC

D1723GF Datasheet(HTML) 39 Page - NEC

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