1 RECEPTION
TS-590S CONTENTS 5
• During the transmission:
The up-conversion configuration is always used in all modes and bandwidths. During the
transmission in SSB mode, the pass bandwidth is determined by the filter settings (digital filter of
the DSP) selected in the menu mode. The pass bandwidth of the filter in the analog stage is 6 kHz
and does not affect the final outcome of the frequency analysis.
• During the reception in AM or FM mode:
The up-conversion configuration is always used regardless of the frequency or pass bandwidth
settings.
• If WIDTH is switched from 500 Hz to 600 Hz during the reception in the 3.5 MHz band in CW
mode:
While the down conversion configuration is maintained, the roofing filter is switched from 500 Hz to
2.7 kHz.
• LO CUT is changed to 200 Hz when receiving in the 14 MHz band in SSB mode with LO CUT 300
Hz and HI CUT 3000 Hz:
Because the final pass bandwidth exceeds 2.7 kHz, the operation is switched from down-
conversion to up-conversion configuration.
• During the reception in the 50 MHz band in SSB mode with LO CUT 300 Hz and HI CUT 2700 Hz:
The up-conversion configuration is used. Though the pass bandwidth of the roofing filter is 15
kHz, the 2.7 kHz filter is selected at the second IF of 10.695 MHz.
Table 1-1 Combination of Filters at Conversion
Hints and Tips “Which type of conversion is used?”
Conversion Type
Analog IF filter Frequency Setting
Conditions Setting Example
Frequency Pass
Bandwidth
Down conversion (in 1.8
MHz, 3.5 MHz, 7 MHz,
14 MHz and 21 MHz
bands and if BW is no
more than 2700 Hz)
11.374 MHz
(first IF)
500 Hz BW is no more than 500 Hz 7.005 MHz/ CW WIDTH:
250 Hz
2.7 kHz BW is between 550 Hz and
2700 Hz
14.175 MHz/ USB LO:
100 Hz, HI 2800 Hz
Up conversion (in other
than above conditions)
10.695 MHz
(second IF)
2.7 kHz BW is no more than 2700 Hz 28.250 MHz/ USB LO:
100 Hz, HI: 2800 Hz
6 kHz
SSB BW is between 2750 Hz
and 5000 Hz/AM HI CUT
between 2.5 kHz and 3 kHz
3.560 MHz/ LSB LO:
50 Hz, HI: 3000 Hz
15 kHz AM HI CUT is between 4 kHz
and 5 kHz*1/ FM
*1 In AM mode, the bandwidth at the IF stage is equal to the value as double as the value for HI CUT frequency at the AF stage.
50.550 MHz/ AM LO:
100 Hz, HI: 4000 Hz