IC-756Pro2_review_ARRL_2002.pdf

《IC-756Pro2_review_ARRL_2002.pdf》由会员分享，可在线阅读，更多相关《IC-756Pro2_review_ARRL_2002.pdf（27页珍藏版）》请在收音机爱好者资料库上搜索。

1、ARRL Laboratory Expanded Test-Result Report ICOM IC-756 Pro II Prepared by: American Radio Relay League, Inc. Technical Department Laboratory 225 Main St. Newington, CT 06111 Telephone: (860) 594-0210 Web Site: http:/www.arrl.org/ Internet email: mtracyarrl.org Order From: American Radio Relay Leagu

2、e, Inc. Technical Department Secretary 225 Main St. Newington, CT 06111 Telephone: (860) 594-0278 Internet email: reprintsarrl.org Price: $7.50 for ARRL Members, $12.50 for non-Members, postpaid. Model Information: Model: IC-756 Pro II Serial #: 01164 QST Product Review: February 2002 Manufacturer:

3、ICOM America, Inc 2380 116th Ave NE PO Box C-90029 Bellevue, WA 98004 USA Phone: 425-454-8155 425-450-6088 (literature) 800-858-6252 Fax: 425-454-1509 Web Site: ARRL Laboratory Expanded Test-Result Report Model: ICOM IC-756 Pro II Serial: 01164 Copyright 2002, American Radio Relay League, Inc. All R

4、ights Reserved. - Page 1 Downloaded by? RadioAmateur.EU Contents: Section Page Introduction 3 Transmitter Output Power 4 Transverter Jack Output Power Test 4 Current Consumption Test 5 Transmit Frequency Range Test 5 CW Transmit Frequency Accuracy Test 6 Spectral Purity Test 6 Transmit Two-Tone IMD

5、Test 9 SSB Carrier and Unwanted Sideband Suppression Test 11 CW Keying Waveform Test 11 Keying Sidebands Test 13 Transmit Keyer Speed Test 13 Transmit/Receive Turnaround Test 13 Transmit Delay Test 14 Transmit Composite Noise Test 14 Receiver Noise Floor Test 16 Receive Frequency Range 16 AM Sensiti

6、vity Test 17 FM SINAD Test 17 Blocking Dynamic Range Test 18 Two-Tone 3rd-Order Dynamic Range Test 19 Second-Order IMD Test 22 In-Band Receiver IMD Test 22 FM Adjacent Channel Selectivity Test 24 FM Two-Tone 3rd-Order Dynamic Range Test 24 Image Rejection Test 24 IF Rejection Test 25 Audio Output Po

7、wer Test 25 IF + Audio Frequency Response Test 25 Squelch Sensitivity Test 26 S-Meter Test 26 Notch Filter Test 26 Notch Attack Time 26 Noise Reduction Test 27 ARRL Laboratory Expanded Test-Result Report Model: ICOM IC-756 Pro II Serial: 01164 Copyright 2002, American Radio Relay League, Inc. All Ri

8、ghts Reserved. - Page 2 Introduction This document summarizes the tests performed by the ARRL Laboratory for each unit that is featured in QST Product Review. The ARRL Laboratory has a separate document, the ARRL Laboratory Test Procedures Manual, that explains our specific test methods in detail in

9、cluding a complete test description, a block diagram showing the specific equipment currently in use for each test, all equipment settings and the specific step by step procedure used. While this is not available as a regular ARRL publication, it can be downloaded from our Members Only web page. The

10、 ARRL Technical Department Secretary can also mail out a copy at a cost of $20.00 for ARRL Members, $25.00 for non-Members, postpaid. Most of the tests used in ARRL product testing are derived from recognized standards and test methods. Other tests have been developed by the ARRL Lab. The ARRL test

11、equipment is calibrated annually, with traceability to National Institute of Standards and Technology (NIST) standards. The units being tested are operated as specified by the manufacturer. Equipment that is intended for mobile and hand-held use is also tested for function, output power and frequenc

12、y accuracy at the minimum specified voltage, as well as at the extremes of their rated temperature range. NOTE: ARRL Product Review testing usually represents a sample of only one unit and is not necessarily representative of all units of the same model number. Often, some parameters will vary signi

13、ficantly from unit to unit. The ARRL Laboratory and Product Review editor work with manufacturers to resolve any problems encountered in the review process and these problems are documented in the Product Review. ARRL Laboratory Expanded Test-Result Report Model: ICOM IC-756 Pro II Serial: 01164 Cop

14、yright 2002, American Radio Relay League, Inc. All Rights Reserved. - Page 3 Transmitter Output Power Test description: The ARRL Lab measures the CW output power for every band on which a transmitter can operate. The unit is tested across the entire amateur band and the worst-case number for each ba

15、nd is reported. The equipment is also tested on any mode of operation for which the transmitter is capable. Typically, the most popular band of operation for each mode is selected. This test also compares the accuracy of the units internal output-power metering against the ARRL Laboratorys calibrate

16、d test equipment. A two-tone audio input, at a level within the manufacturers microphone-input specifications, is used for the SSB mode. No modulation is used in the AM and FM modes. Note that most transmitters are de-rated from maximum output power on full-carrier AM and FM modes. Typically, a 100-

17、watt CW/SSB transmitter may be rated at 25 watts carrier power on AM. The radio may actually deliver 100 watts PEP in AM or FM, but is not specified to deliver full power for continuous duty. In almost all cases, the linearity of a transmitter decreases as output power increases. A transmitter rated

18、 at 100 watts PEP on single sideband may actually be able to deliver more power, but as the power is increased beyond the rated RF output power, adjacent channel splatter (IMD) usually increases dramatically. SSB transmitter testing is typically performed at the transmitters rated PEP SSB output. Tr

19、ansmitter Output Power Test Results: Frequency Mode Units Meter Minimum Power (W) Measured Minimum Power (W) Unit s Meter Maximum Power (W) Measured Maximum Power (W) Notes 1.8 MHz CW N/A 0.5 W 100 W 103.4 W 3.5 MHz CW N/A 0.7 W 100 W 112.0 W 3.5 MHz AM N/A 0.1W 37 (approx.) 39.0 W 7 MHz CW N/A 0.7

20、W 100 W 116.3 W 10.1 MHz CW N/A 0.7 W 100 W 117.2 W 14 MHz CW N/A 0.7 W 100 W 117.5 W 14 MHz USB N/A 0.9 W 100 W 114.5 W 18 MHz CW N/A 0.7 W 100 W 117.8 W 21 MHz CW N/A 0.7 W 100 W 118.2 W 24 MHz CW N/A 0.7 W 100 W 117.5 W 28 MHz CW N/A 0.7 W 100 W 117.2 W 28 MHz FM N/A 0.1 W 100 W 116.9 W 50 MHz CW

21、 N/A 0.1 W 100 W 108.1 W 50 MHz FM N/A 0.7 W 100 W 106.1 W 50 MHz SSB N/A 0.1 W 100 W 107.9 W 50 MHz AM N/A 3 kHz away) that cause the most problems. These can cause splatter up and down the band from strong signals. Transmit IMD Graphs ICOM IC-756 Pro II, s/n 01164 1.850 MHz, Transmit IMD, 100 W F:

22、SHAREDPROD_REVTESTSIC756P2756P2ILO.TXT 1086420246810 80 70 60 50 40 30 20 10 0 Frequency Offset (kHz) Reference Level: 0 dB PEP ICOM IC-756 Pro II, s/n 01164 3.900 MHz, Transmit IMD, 100 W F:SHAREDPROD_REVTESTSIC756P2756P2I80.TXT 1086420246810 80 70 60 50 40 30 20 10 0 Frequency Offset (kHz) Referen

23、ce Level: 0 dB PEP ICOM IC-756 Pro II, s/n 01164 7.250 MHz, Transmit IMD, 100 W F:SHAREDPROD_REVTESTSIC756P2756P2I40.TXT 1086420246810 80 70 60 50 40 30 20 10 0 Frequency Offset (kHz) Reference Level: 0 dB PEP ICOM IC-756 Pro II, s/n 01164 10.120 MHz, Transmit IMD, 100 W F:SHAREDPROD_REVTESTSIC756P2

24、756P2I30.TXT 1086420246810 80 70 60 50 40 30 20 10 0 Frequency Offset (kHz) Reference Level: 0 dB PEP ARRL Laboratory Expanded Test-Result Report Model: ICOM IC-756 Pro II Serial: 01164 Copyright 2002, American Radio Relay League, Inc. All Rights Reserved. - Page 9 ICOM IC-756 Pro II, s/n 01164 14.2

25、50 MHz, Transmit IMD, 100 W F:SHAREDPROD_REVTESTSIC756P2756P2I20.TXT 1086420246810 80 70 60 50 40 30 20 10 0 Frequency Offset (kHz) Reference Level: 0 dB PEP ICOM IC-756 Pro II, s/n 01164 18.120 MHz, Transmit IMD, 100 W F:SHAREDPROD_REVTESTSIC756P2756P2I17.TXT 1086420246810 80 70 60 50 40 30 20 10 0

26、 Frequency Offset (kHz) Reference Level: 0 dB PEP ICOM IC-756 Pro II, s/n 01164 21.250 MHz, Transmit IMD, 100 W F:SHAREDPROD_REVTESTSIC756P2756P2I15.TXT 1086420246810 80 70 60 50 40 30 20 10 0 Frequency Offset (kHz) Reference Level: 0 dB PEP ICOM IC-756 Pro II, s/n 01164 24.950 MHz, Transmit IMD, 10

27、0 W F:SHAREDPROD_REVTESTSIC756P2756P2I12.TXT 1086420246810 80 70 60 50 40 30 20 10 0 Frequency Offset (kHz) Reference Level: 0 dB PEP ARRL Laboratory Expanded Test-Result Report Model: ICOM IC-756 Pro II Serial: 01164 Copyright 2002, American Radio Relay League, Inc. All Rights Reserved. - Page 10 I

28、COM IC-756 Pro II, s/n 01164 28.350 MHz, Transmit IMD, 100 W F:SHAREDPROD_REVTESTSIC756P2756P2I10.TXT 1086420246810 80 70 60 50 40 30 20 10 0 Frequency Offset (kHz) Reference Level: 0 dB PEP ICOM IC-756 Pro II, s/n 01164 50.200 MHz, Transmit IMD, 100 W F:SHAREDPROD_REVTESTSIC756P2756P2I6M.TXT 108642

29、0246810 80 70 60 50 40 30 20 10 0 Frequency Offset (kHz) Reference Level: 0 dB PEP SSB Carrier and Unwanted Sideband Suppression Test Test Description: The purpose of the SSB Carrier and opposite-sideband Suppression test is to determine the level of unwanted carrier and unwanted sideband relative t

30、o Peak Envelope Power (PEP). The transmitter output is observed on the spectrum analyzer and the unwanted components are compared to the desired sideband. The greater the amount of suppression, the better the transmitter. Test Results: Frequency/ Mode Carrier Suppression (dB) Opposite Sideband Suppr

31、ession (dB) Notes 14.2 MHz USB 65 dB PEP 65 dB PEP 14.2 MHz LSB 65 dB PEP 65 dB PEP CW Keying Waveform Test Test Description: The purpose of the CW Keying Waveform Test is to determine the shape of the RF output envelope for the unit under test in the CW mode. A picture of the oscilloscope screen is

32、 taken of the results with the QSK on, and with QSK off, showing the first dit, and any other test conditions that result in a waveshape that is significantly different from the others (more than 10% difference, spikes, etc.). The first and second dits are shown in all modes. If the risetime or fall

33、time become too short, the transmitter will generate key clicks. Most click-free transmitters have a rise and fall time between 1 ms and 5 ms. The absolute value of the on delay and off delay are not critical, but it is important that they be approximately the same so that CW weighting will not be a

34、ffected. Some transmitters used in semi-QSK (or QSK off) mode exhibit a first dit that is shorter than subsequent dits. Other transmitters can show significant shortening of all dits when used in the QSK mode. The latter will cause keying to sound choppy at higher keying speeds. ARRL Laboratory Expa

35、nded Test-Result Report Model: ICOM IC-756 Pro II Serial: 01164 Copyright 2002, American Radio Relay League, Inc. All Rights Reserved. - Page 11 Note: All Figures are 10 ms/division, unless otherwise noted. Figure 1 shows the first and second dits with QSK on. Figure 2 shows the first and second dit

36、s with QSK off. CW Keying Waveforms Figure 1 CW keying - QSK on Figure 2 CW keying - QSK off ARRL Laboratory Expanded Test-Result Report Model: ICOM IC-756 Pro II Serial: 01164 Copyright 2002, American Radio Relay League, Inc. All Rights Reserved. - Page 12 Downloaded by? RadioAmateur.EU Keying Side

37、bands Test Test Description: This test measures the spurious sidebands creating by the CW keying wave shape, so as to indicate the degree to which the transmitter would produce key clicks. As a point of reference, see the expanded test result report for the original ICOM IC-756 (May 1997). The trans

38、mitter is set up to key at a 60 wpm rate via an external source (as in the Keying Waveform Test), and the attenuated output is fed into the spectrum analyzer. The analyzer is configured to sweep very slowly (30 second) over a frequency range of 20 kHz. The input bandwidth is set to a narrow 300 Hz t

39、o approximate the bandwidth of a CW receiver. ICOM IC-756 Pro II, s/n 01164 14.0 MHz Band, Keying Sidebands, QSK, 100 W C:MYDOCU1PRODREVTESTDATAICOMIC756P2KEYSB756P2QSK.TXT 14.01614.01814.02014.02214.024 90 80 70 60 50 40 30 20 10 0 Frequency (MHz) Reference Level: 0 dBc ICOM IC-756 Pro II, s/n 0116

40、4 14.0 MHz Band, Keying Sidebands, Semi-QSK, 100 W C:MYDOCU1PRODREVTESTDATAICOMIC756P2KEYSB756P2SBK.TXT 14.01614.01814.02014.02214.024 90 80 70 60 50 40 30 20 10 0 Frequency (MHz) Reference Level: 0 dBc Transmit Keyer Speed Test Test Description: This test measures the speed of the internal keyer on

41、 transmitters so equipped. The keyer is tests at minimum, midrange and maximum speeds and the time from dit to dit is measured using an oscilloscope and used to calculate the speed using the Paris method of code speed calculation. (In the Paris method, the word Paris is used as the standard word to

42、calculate words per minute.) Test Results: Min WPM Max WPM Mid WPM Notes 6 WPM 48 WPM 38 WPM Transmit/Receive Turnaround Test Test Description: The purpose of the Transmit/Receive turnaround test is to measure the delay required to switch from transmit mode to receive mode. Test Results: Frequency C

43、onditions T/R Delay AGC Fast T/R Delay AGC Slow Notes 14.2 MHz SSB 23 ms 24 ms 1 Notes: 1. T/R delay less than or equal to 35 ms is suitable for use on AMTOR. ARRL Laboratory Expanded Test-Result Report Model: ICOM IC-756 Pro II Serial: 01164 Copyright 2002, American Radio Relay League, Inc. All Rig

44、hts Reserved. - Page 13 Transmit Delay Test Test Description: The purpose of the Transmit Delay test is to measure the time between PTT closure and 50% RF output. It is measured on SSB, modulated with a single tone and on FM, unmodulated. Test Results: Frequency (MHz) Mode On delay Notes 14.2 MHz SS

45、B 20 ms 29 MHz FM 12 ms 52 MHz FM 10 ms Transmit Composite Noise Test Test Description: The purpose of the Composite-Noise Test is to observe and measure the phase and amplitude noise, as well as any spurious signals generated by the device under test transmitter. Since phase noise is the primary no

46、ise component in any well-designed transmitter, it can be assumed, therefore, that almost all the noise observed during this test is phase noise. This measurement is accomplished by converting the output of the transmitter down to a frequency about 10 or 20 Hz above baseband. A mixer and a signal ge

47、nerator used as a local oscillator are used to perform this conversion. Filters remove the 0 Hz component as well as the unwanted heterodyne components. The remaining noise and spurious signals are then observed on the spectrum analyzer. The lower the noise as seen on the plot, the better the transm

48、itter. Transmit Composite Noise Graphs ICOM IC-756 Pro II, s/n 01164 3.520 MHz, Phase Noise, 100 W F:SHAREDPROD_REVTESTSIC756P2756P2P80.TXT 246810121416182022 140 130 120 110 100 90 80 70 60 Frequency Sweep: 2 to 22 kHz from Carrier Reference Level: - 60 dBc/Hz Vertical Scale: dBc/Hz ICOM IC-756 Pro

49、 II, s/n 01164 14.020 MHz, Phase Noise, 100 W F:SHAREDPROD_REVTESTSIC756P2756P2P20.TXT 246810121416182022 140 130 120 110 100 90 80 70 60 Frequency Sweep: 2 to 22 kHz from Carrier Reference Level: - 60 dBc/Hz Vertical Scale: dBc/Hz ARRL Laboratory Expanded Test-Result Report Model: ICOM IC-756 Pro II Serial: 01164 Copyright 2002, American Radio Relay League, Inc. All Rights Reserved. -