DRAKE R-4A Spezifikationen PDF herunterladen (Seite 21)

Fixed Frequency Operation

The R-4A can be locked to a specific frequency by plugging the

appropriate crystal in the crystal lock socket, located on the left

side of the chassis, and positioning the

XTAL/VFO

switch to the

XTAL position.

When the switch is so positioned, the R-4A VFO and crystal oscillator

system will no longer control the frequency.

Crystals for this application should be of the parallel resonant

fundamental variety with HC-6/U holders. The frequency of the

crystal to be used in this socket should be equal to the desired

operating frequency +5645 KC or to

l/2

of this value if it exceeds 15mc.

EXAMPLES:

Desired operating freq. 7155KC + 5645 KC =

12.800KC

(crystal frequency)

Desired operating freq.

21,145KC

+ 5645KC = 26,790KC

2 =

13,395KC

(crystal frequency)

A trimmer capacitor is provided directly below the crystal socket for

”

pulling” the crystal slightly in order to get exactly on the desired

frequency.

The PRESELECTOR and BAND switch should be positioned as described

under “Accessory Frequency Coverage”

for the desired frequency. If a

T4X

is being used, placing the

T4X

TRANSCEIVE switch on SEP.CONT.

will result in the

T4X

being VFO controlled while the R-4A is xtal locked.

Placing this switch in the RCVR position will lock the

T4X

on the R-4A

lock frequency.

If the switch is placed on XMIT, the

T4X

controls both receive and

transmit frequencies.

The lock crystal in the R-4A will then have no

effect.

Crystals for fixed frequency

R-4A

operation may be ordered direct from

the R. L. Drake Company.

When ordering, be sure to specify that the

crystal you are ordering is for fixed frequency operation with the R-4A.

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