Kenwood 144, 440 MHz TH-D7A Problem, Probable Cause, Corrective Action, Operating the

Models: 144 440 MHz TH-D7A TH-D7A

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Operating the

Problem

Probable Cause

Corrective Action

Ref. Page

 

 

 

 

Operating the

1 Too large distance between the

1 Operate the Commander within a

Commander simply

Commander and Transporter

distance that allows the two

 

causes it to output an

prevents correct data

transceivers to show a full-scale

 

error beep and does not

communications.

S-meter reading.

 

allow you to control the

2 Bad radio wave conditions prevent

2 Press [SYNC] occasionally to read the

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HF transceiver.

control commands from being

status of the HF transceiver.

 

 

correctly transmitted.

 

 

You cannot hear audio

You switched ON the CTCSS on the

Press [F], [3] to switch OFF the CTCSS.

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received by the HF

144 MHz band of the Commander.

 

 

transceiver.

 

 

 

 

 

 

 

You cannot

You failed to correctly enter

Use Menu 3–1 to 3–6 to correctly enter

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superimpose

information to be superimposed.

the desired information.

 

information onto the

 

 

 

VC-H1 monitor.

 

 

 

 

 

 

 

You cannot program

Bad cable connections.

Refer to the instruction manual for the

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the VC-H1 with a SSTV

 

VC-H1 and correctly connect the VC-H1

 

mode.

 

to the transceiver.

 

Note: When two received frequencies have relationships per the equation below or other similar relationships, an internal heterodyne may be heard. This is not a defect.

2 (fU – 45.05) – 4 (fV + 38.85) = 38.85 or 45.05 (fU – 45.05) – 2 (fV + 38.85) = 38.85

n (fSV – 45.05) – n (fV + 38.85) = 38.85 or 45.05 where n = 3, 4, or 5. fV = VHF frequency (band A)

fU = UHF frequency (band B) fSV = VHF frequency (band B)

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Page 101
Image 101
Kenwood 144, 440 MHz TH-D7A instruction manual Problem, Probable Cause, Corrective Action, Operating the