IC-7851
Test Report for IC-7851 July 1 and September 21-22, 2015 by Adam Farson VA7OJ/AB4OJ (Iss. 2)
The following are the results obtained from lab tests which the author conducted on Icom IC-7851 S/N 02001019, kindly loaned by Allan Buckshon VE7SZ. The installed firmware versions were V1.01 for the receiver tests and V1.11 for the transmitter tests. The baseline configuration for all receiver tests was MAIN Receiver, NR/NB/ATT/Notch off, AGC Slow . A. Receiver Tests (July 1, 2015): 1. MDS (Minimum Discernible Signal). Test setup: Marconi 2018A signal generator, 20 dB pad, DUT ANT1 input.
HP 339A distortion meter at EXT SP jack as level meter. 2. NPR (Noise Power Ratio). Test setup: Wandel & Goltermann RS-50 and RS-25 noise generators (fitted with filters per Table 2), MCL 75/50Ω transformer or matching pad for 1940 kHz only), DUT ANT1 input. DUT set to LSB for all test frequencies except 5340 kHz (USB). 2.4 kHz IF filter selected. Noise loading adjusted for 3 dB increase in audio output at EXT SP jack, as read on HP 339A. NPR derived by calculation. 3. RMDR (Reciprocal Mixing Dynamic Range). Test setup: Marconi 2018A signal generator, 3 dB pad, 9830 kHz bandstop filter, 0-110 dB step attenuator, DUT ANT1 port. HP 339A distortion meter at EXT SP jack as level meter. 4. DR3 (2-Tone 3rd -Order IMD Dynamic Range).
Test setup: Marconi 2018A and 2019 signal generators, MCL ZHL-32A buffer amplifiers, MCL low-pass filters appropriate for band tested, 20 dB pads, MCL ZSC-2-1W combiner, 0-110 dB step attenuator, DUT ANT1 input. Test signal level adjusted for 3 dB increase in audio output at EXT SP jack, as read on HP 339A. 5. Roofing-filter bandwidth: As for 1. 6. Spectrum scope RBW: As for 1. 1. MDS (Minimum Discernible Signal) tested on 14.1 MHz in CW mode (500 Hz), Preamp off, 1 and 2 in turn. Roofing filter 15, 6, 3 and 1.2 kHz in turn. The MAIN receiver is tuned to f0 = 14.1 MHz and a test signal applied. For each preamp/roofing filter combination, the input power Pi required to raise audio output noise level by 3 dB is noted. Pi = MDS. NR/NB/ATT/Notch off, AGC Slow for all tests. Refer to Table 1. A variant of MDS is also measured in SSB mode (2.4 kHz) at each of the four NPR test frequencies in turn, for use in calculating NPR. The measured MDS values and roofing-filter correction values are given in Table 2. Table 1: Minimum Discernible Signal (MDS). 14.1 MHz, 500 Hz CW..
Release notes Version 1.28.0 MAINTENANCE RELEASE – Added support to a new service (Special Contest Calls) that will work with SCL (Special Callsign) f... Read more
by Bob K0NR “Some exciting news wandered into my inbox this past week concerning a handheld radio driven by the Android operating system. The RF... Read more
The RSGB IOTA Contest is the most popular contest in the RSGB HF Contests calendar, attracting entries from around the world. IOTA refers to the RSGB... Read more
Hybrid SDR Configuration In addition to the Narrow band SDR receiver, that boasts overwhelming Basic Performance, the Hybrid Configuration Digital Pro... Read more
Morse code is hugely popular as evidenced by the level of activity seen in the this 30 second snapshot of the CQWW 160 metre contest this evening. Des... Read more
ABOUT THE AUTHOR Marga Ortigas Marga Ortigas covers the Asia-Pacific region for Al Jazeera English. Beijing, China – His kingdom was tu... Read more
Faraglia Martin, aged 13 First radio amateur in Trentino Alto Adige. he is currently also one of the youngest radio amateurs in Italy. Martin attends... Read more
RT-100 LDG has announced the RT-100. The RT-100 is a 100 watt coax in / coax out remote tuner designed to be placed near the feedpoint of the antenna.... Read more
Indonesia Earthquakes and Tsunami A sequence of earthquakes and a tsunami in the Indonesian areas of Donggala and Palu on 28th September have left hun... Read more
The winning article for the September 2018 QST Cover Plaque award is “Small Gap-Resonated HF Loop Antennas” by Kai Siwiak, KE4PT, and Richard Quick, W... Read more
So, do you think Nikola Tesla’s wireless energy system could have worked? Find out in this video! Read more
JVP Antenas was born in 1982 by José Vasallo Paleologo LU1FJ, former LU5FHM with the idea of manufacturing high performance antennas for amateur rad... Read more
Recent Posts
Log4OM 1.28.0 has been released
Introducing The Android HT
RSGB IOTA Contest Announced Operations: 2019
Yaesu FTDX101D First Look
![30s snapshot of the CQWW 160 contest [ VIDEO ]](https://qrznow.com/wp-content/uploads/2020/01/cqww-265x168.jpg)
30s snapshot of the CQWW 160 contest [ VIDEO ]
Al Jazeera: Ham Radio and Scarborough Reef ( BS7H )
Martin Faraglia 13 years IN3EYI Second Op. ARRL DX Contest march 5-6 2016
LDG RT-100 Remote Tuner
Indonesia Earthquakes and Tsunami
KE4PT and W4RQ Win the September QST Cover Plaque Award
Tesla Coil Wireless Energy and Resonance Demonstration
JVP Antennas back to the market!
Warning: file_get_contents(https://plusone.google.com/_/+1/fastbutton?url=https%3A%2F%2Fqrznow.com%2Fcomplete-ic-7851-test-report-now-on-line-by-adam-va7ojab4oj%2F): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found in /home/qrznow/public_html/wp-content/themes/goodnews5/framework/functions/posts_share.php on line 151
