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1 RECEPTION
10 CONTENTS TS-590S
Following is a figure that represents the TX-RX UNIT that has the circuitry configuration in question.
By detaching the lower case, you can access the jumper connectors CN101 through CN103.
Figure 1-8 TX-RX UNIT
1) Raising sensitivity in the BC band:
Remove the jumper for CN103 and insert the jumper into CN102. This will increase the sensitivity
in the BC band for 20 dB. (Assuming that there is the high output power in local broadcasting
stations in the BC band, the sensitivity is lowered by 20 dB as the
is factory default.)
2) Changing the attenuation amount of ATT:
Remove the jumper of CN101. This changes the attenuation of ATT from 12 dB to 20 dB. (Store
the removed jumper in a secure place for future use.)
The headphone jack of the TS-590S is designed to have, as on the previous HF transceivers, an
impedance of 8 (standard). Therefore, if you use a headphone with impedance higher than 8, you
will experience the symptoms as below.
The volume level is too high overall.
Even if AF Volume is turned down, a hissing residual noise is audible.
Even if the beep sound level is set to minimum, the beep sound is loud.
If you experience these symptoms, use a set of headphones with impedance close to 8.
Hints and Tips “The output level of the headphone jack is too high?”
CN101
CN102
CN103
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