FTDX101D Test

| mayo 11, 2019

FTDX101D Test

Sherwood Engineering HF Test Results

FTDX101D TestSherwood Engineering HF Test Results

  • Model FTdx101D
  • Serial # 9F010008
  • Starting test date: 05/10/2019
IF BW 2400 -6 / -60, Hz / Ultimate dB
IF BW 500 -6 /-60, Hz / Ultimate dB
Front End Selectivity (A – F) First IF rejection +/- kHz dB
Dynamic Range with radio, no preamp Dynamic Range 20 kHz 110 dB
Dynamic Range 10 kHz 110 dB
Dynamic Range 5 kHz 110 dB

Dynamic Range 2 kHz

# Combination of phase noise and 3rd order product

110 dB
* Consisted of phase noise only
Dynamic Range with radio, Preamp 1 Dynamic Range 20 kHz 110 dB
Dynamic Range 10 kHz 110 dB
Dynamic Range 5 kHz 110 dB

Dynamic Range 2 kHz

# Combination of phase noise and 3rd order product

110 dB
* Consisted of phase noise only
Dynamic Range with radio, 2nd radio Dynamic Range 20 kHz dB
Dynamic Range 2 kHz dB
Dynamic Range with radio, alternate conversion scheme Dynamic Range 20 kHz dB
Dynamic Range 2 kHz dB
Blocking above noise floor, 1uV signal @ 100 kHz, AGC On, (Or ADC overload for DS SDR radios) 147 dB
Spacing kHz dB
2.5 124 dB
5 126 dB

10

15

127 dB

20

25

30

40

128 dB

50

75

128 dB
100 128 dB

200

300

400

500

128 dB
Phase noise (normalized) at 2.5 kHz spacing: 151 dBc
Phase noise (normalized) at 5 kHz spacing: 153 dBc
Phase noise (normalized) at 10 kHz spacing: 154 dBc
Phase noise (normalized) at 20 kHz spacing: 155 dBc
Phase noise (normalized) at 30 kHz spacing: dBc
Phase noise (normalized) at 40 kHz spacing: dBc
Phase noise (normalized) at 50 kHz spacing: 155 dBc
Phase noise (normalized) at 80 kHz spacing: dBc
Phase noise (normalized) at 100 kHz spacing: 155 dBc
Phase noise (normalized) at 200 kHz spacing: 155 dBc
Phase noise (normalized) at 300 kHz spacing: dBc
Phase noise (normalized) at 400 kHz spacing: dBc
Phase noise (normalized) at 500 kHz spacing: dBc
Noise floor, SSB bandwidth 14 MHz, no preamp -121 dBm
Noise floor, SSB bandwidth 14 MHz, Preamp 1 On -130 dBm
Noise floor, SSB bandwidth 14 MHz, Preamp 2 On -135 dBm
Sensitivity SSB at 14 MHz, no preamp 0.6 uV
Sensitivity SSB at 14 MHz, Preamp 1 On 0.2 uV
Sensitivity SSB at 14 MHz, Preamp 2 On 0.12 uV
Noise floor, 500 Hz, 14.2 MHz, no preamp -127 dBm
Noise floor, 500 Hz, 14.2 MHz, Preamp 1 On -136 dBm
Noise floor, 500 Hz, 14.2 MHz, Preamp 2 On -140 dBm
Noise floor, SSB, 50.125 MHz, no preamp -125 dBm
Noise floor, SSB, 50.125 MHz, Preamp 1 -134 dBm
Noise floor, SSB, 50.125 MHz, Preamp 2 -135 dBm
Sensitivity, SSB, 50.125 MHz, no preamp 0.4 uV
Sensitivity, SSB, 50.125 MHz, Preamp 1 0.14 uV
Sensitivity, SSB, 50.125 MHz, Preamp 2 0.12 uV
Noise floor, 500 Hz, 50.125 MHz, no preamp -130 dBm
Noise floor, 500 Hz, 50.125 MHz, Preamp 1 On -139 dBm
Noise floor, 500 Hz, 50.125 MHz, Preamp 2 On -141 dBm
Signal for S9, no preamp 100 uV
Signal for S9, Preamp 1 32 uV
Signal for S9, Preamp 2 13 uV
Gain of preamp(s)
Preamp 1 9 dB
Preamp 2 18 dB
AGC threshold at 3 dB, no preamp 4.5 uV
AGC threshold at 3 dB, Preamp 1 On 1.6 uV
AGC threshold at 3 dB, Preamp 2 On 0.58 uV

Notes:

The waterfall is rather granular (chunky).

IMD on the spectrum display is significantly higher than the down-conversion radio itself. (Less dynamic range on the bandscope than the radio itself)

Strangely at the strong test signal levels required to test the radio for dynamic range (DR3) the spectrum display / waterfall has a notch (dead zone) equal to the roofing filter bandwidth at levels around S9+40 dB.

With a single test signal, such as making a Reciprocal Mixing Dynamic Range (RMDR) measurement, the level for this anomaly is around S9+53 dB.

FTDX101D Test


Unless the touch screen pressure is adjustable in a menu, it takes excessive pressure to make simple changes such as selecting the antenna port or switching preamps.

There is not a dedicated power output knob, which is inconvenient when adjusting drive to a linear amplifier. This requires a button push, a push on the multi-function knob, then selecting the power output function on a very busy menu, and finally adjusting output power with the multi-function knob. This can be assigned to the C. S. button, but takes 3 functions: Push C.S. button, adjust with sub-RX VFO dial, push C.S. button again.

Transmit intermodulation, band limited white noise to approximate speech

FTDX101D Test

Output power overshoot occurs on CW, and even more so on SSB. When output power is set for 30 watts, typical of a low drive linear amplifier, peak power can exceed 120 watts, four times the desired power setting. A peak reading wattmeter has captured peaks exceeding 180 watts.

There have been some email reflector reports of the FTdx-101D causing linear amplifiers to fault on SSB due to the excessive overshoot.

SSB overshoot set for 30 watts output. Horizontal cursor lines are set at 30 watts.

FTDX101D Test

CW overshoot at 30 watts key down.

FTDX101D Test

The key line timing is acceptable for a QSK capable linear amplifier. Unless there is a menu setting to adjust for slower T/R relays in non-QSK amps, hot switching may occur on CW and SSB on the initial power output. The “key-up” delay is adequate. Key down delay is about 14ms, and key up is about 3ms.

FTDX101D Test

Transmit odd-order IMD

Power 100 watts odd-order product dBc Add 6 dB for PEP method
Band 3rd 5th th 9th
6m -25 -29 -37 -48
20m -33 -32 -41 -53
80m -37 -38 -41 -44
Power 50 watts odd-order product dBc Add 6 dB for PEP method
Band 3rd 5th th 9th
6m -26 -37 -51 -61
20m -26 -35 -49 -55
80m -34 -35 -40 -48

Broadband transmit composite noise (total noise)

Composite noise is a combination of phase noise and AM noise. Noise interference, particularly with strong signals on the same band, is caused by composite noise (total noise), not just phase noise. Most data in magazines currently only publish phase noise data, which may be much less than composite noise. The ARRL is working on correcting this oversight.

Composite Noise, 20 meters at 100 and 30 watts Value in dBc/Hz

Offset 1 kHz 2 kHz 5 kHz 10 kHz 20 kHz 100 kHz
100 watts -131 -133 -134 -137 -138 -141
30 watts -128 -129 -132 -134 -135 -137

Many linear amps require much less than full transceiver output for rated output. Rev E

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