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MagaZine - Free and Open Source Software


u n

........."o IuS

0/10 CIl Ys . a~ l a ~ .

' ~S E ~ T S E ~'U


TO CHas s ," G R O U ~O

~ - ..,.-

vUlaBlE C a .a c "o ~

Fig. 3. VXO operation with the Midland 13-866.

non can be inc reased by

removmg TR8 from the circuit.

Addi ng add itional cha n­

nels by using a 4PDT switch

is accomplis hed by removing

the green, o range, blue,

and black leads going from

the selecto r swi tc h to the

14-MHz crystals on the

c hassi s Connect these

wi res as d iagramed in Fig. 2.

With the switc h down, the

24 low c hanne ls will be obtained

With the switc h in

the up position, the upper

range can be used.

For frequenci es other

than, or in addition to, the

normal 73 band plan, the

basic conve rs io n has a

usable range of about 800

kHz without retuning.

VXO operation with this

radio can be obtained by

li fting the ground bus of the

14-MH L crysta ls an d inserting

a 1().-uH choke and a

S-So-pF variable capacito r

in series with the crystal bus

to chassis ground, as In Fig.

3. This trick will work With

any fundamental crysta ls

up to about lbMHz . Do not

attempt to use it on crystals

operating in the overtone

mode because severe instability

wil l resul t. _

~ " Lunar's new 2M 4-40P

Linearized Amplifier

makes your hand-held

synthesized transceiver


1 to 4 WATTS IN-

10 to 40 WATTS OUT.

• Can be used with any

1·5 watt radio,

• Uneartzed so It's

compatible with SSB.

• Has pre-amp lOt' receiver

portion to Incre.se power and

clarity of Incoming signals.

• Amp and pre-amp functions

Independenlly controllable.

• Remote conlrol capabUity•

• Regulated voltage output as

required by the FT 207A and

TR2400 to conNl'Ye bauery pack.

• Turns your 1-4 waU transceiver

Into a higher powered base

or mobile station.

• Made with the quality and care

that has made Lunar the leader

In linearized amps.

8S Kurtl Street. Suite 10. San Diego, CA 92110

ephone 714 299-9740 Louis N, Anclaux

elex 181747


73 Magazine · April, 1981 105

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