TS-440S

I

CIRCUIT DESCRIPTION

13. Band information generation circuit (in the R F unit )

Band information from the control unit is sent to connecto r 15 of the RF unit . Band information signals BO to B3 for m a BCD code in which BO corresponds to LSB . Q4D (M74LS145P) is used to convert data from BCD to DEC, an d it generates control signals for ten of the 11 bands . Control signals for the remaining band (25 .5 MHz to 30 MHz) ar e generated in the AND circuit consisting of D57, D58, an d Q46 . These contorl signals go through the current buffer con - sisting of Q41 to Q45 (M54561P and 2SA562Y), and ar e OR'ed by diodes, as required, and sent to AT unit, filter unit , CO, and ANT BPF, as shown in Figure 21 .

Q40 M74LS145P

BCD — DEC

Q41 M54561P Buff \/ x V v 0

042 Q43 Q44

Band information 7800 PBo — 3, B3B2B1B o

 

30kHz -

0

.5MHz

0 0

0 0

0

.5MHz -

1

.6MHz

0 0

0

1

1 .6MHz -

2

.5MHz

0 0

1

0

2

.5MHz -

4MHz

0 0

1

1

 

4MHz -

6MHz

0 1

0 0

 

6MHz -

7

.5MHz

01

0 1

7

.5MHz -

10 .5MHz

01

1

0

10

.5MHz -

14 .5MHz

0 1

1

1

14

.5MHz -

22MHz

1 0

0 0

22MHz -

25 .5MHz

1 00 1

25

.5MHz -

30MHz

1 0 1

0

Table 1 3

I4V

28T (25 .5 . 30 1

0 24T 122 25.5 1

To AT u

0

IT

114 .5- 221

10 I4T 110 .5-- 14.5 1

0

1OT

17.5 '

10 .5 1

 

7T

(6 ~..

7.51

lD60 ~~6 1

D65

 

28F 122 ,-, 30 )

 

 

21F

 

(14 .5-- 22 )

 

D64

0

 

 

141

 

17.5-- 14 .5 1

To Filter u

0ID63

 

0

71'

 

(47-7 .5 1

N1

 

 

D62

0

4F

 

(2.5^, 4 ,

 

 

 

 

 

 

I

0

2F

 

11 .6-- 2 .5)

 

Q17

 

Q21

67.05

75 .0 5

-

•

O

 

122 .. 301

 

I

Q1 8

 

022 I

59.55 ...

67.0 5

 

0

 

 

(

 

 

 

 

 

/J\

1114 .5 .22 1

 

Q

 

Q23 (

52 .55

5

 

 

 

 

1 (7 .5-14 .5 1

 

020

 

Q24 ( 45 .05 52.5 5

 

 

 

 

 

(0 ^ 7 .5 1

 

VCO SW VCO

To RFU BPF

Fig . 21 Band information generation circuit

23

Page 22 Page 24
Page 23
Image 23
Kenwood MB-430, PS-50 Band information 7800 PBo 3, B3B2B1B o, Vco Sw Vco, Fig Band information generation circuit, Bcd Dec
Page 22 Page 24

SP-430, VS-1, PS-430, AT-440, YK-88C specifications

The Kenwood MB-430, PS-50, YK-88S, YK-88CN, and YK-88SN are notable components that enhance the capabilities of Kenwood's transceiver products, particularly in the amateur radio segment. Each of these units plays an essential role in expanding functionality, improving performance, and providing users with valuable features that are beneficial in various communication scenarios.

Starting with the Kenwood MB-430, it serves as a versatile mobile bracket designed for specific Kenwood radio models. The MB-430 enhances mobility, allowing operators to mount their radios securely in vehicles or portable setups. Its sturdy construction ensures reliability during operation, and it offers a simple installation process, making it user-friendly for both beginners and seasoned enthusiasts.

The PS-50 power supply is a crucial accessory that complements Kenwood's transceiver line. This power supply is known for its compact design, providing 13.8 V DC output, which is essential for powering radios effectively. With a current rating that adequately supports various transceivers, the PS-50 is equipped with short-circuit protection and thermal overload features. These safety mechanisms protect both the power supply and the connected equipment, making it a dependable choice amongst operators.

The YK-88S, YK-88CN, and YK-88SN are all filters that enhance the performance of Kenwood transceivers. The YK-88S is a high-performance SSB filter, designed to improve the clarity of SSB signals while reducing adjacent channel interference. It offers narrow bandwidth options that facilitate more precise tuning, making it particularly valuable in crowded band conditions.

Meanwhile, the YK-88CN is known for its crystal filter technology, optimizing the transceiver's performance for CW and digital modes. This filter helps in eliminating unwanted noise, allowing operators to enjoy clearer reception and improved decoding of weak signals.

The YK-88SN, similar in function to the YK-88S and YK-88CN, provides additional narrow filtering options, enhancing the agility of transceiver operation in various modes. It effectively enhances selectivity and reduces interference from strong signals, providing a cleaner audio output.

Together, these components contribute to a seamless operating experience for amateur radio enthusiasts. Whether enhancing filter characteristics, providing reliable power, or ensuring secure mobility, the MB-430, PS-50, YK-88S, YK-88CN, and YK-88SN demonstrate Kenwood’s commitment to quality and performance in the radio communications field.
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