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..
This month’s QuickStats poll has been posted! Check the QuickStats page and answer these questions . . . • Have you ever repaired your primary transce... Read more
YAESU FT DX3000 Review Read more
Michael DB6NT and Andreas DB2NP made on 20th July 2020 first-ever QSO on 725Ghz! Congratulation for these great achievement! http://www.db6nt.de/filea... Read more
The ZUMspot RPi is an advanced radio module board. Paired with a Raspberry Pi and the MMDVM software becomes a small and efficient multi-mode digital... Read more
“The Athens Daily Review reports Loretta Smith KG5QCH has achieved her amateur radio license at the age of 91 The newspaper says: Loretta Smith,... Read more
Applications for the 2020 ARRL Foundation Scholarship Program will be accepted between September 1 and December 31, 2019. All applicants must be FCC-l... Read more
Yaesu FT-DX101D HF/50MHz 100W SDR Yaesu FT-DX101D HF/50MHz 100W SDR Reservation ** Get in line! Reserve yours today, risk free! ** This radio has NOT... Read more
Listen to Christmas in Antarctica by Dan KB6NU “Hi, everyone. Merry Christmas, Happy Hanukkah, and any other holidays you may celebrate!... Read more
J52HF will be again on air from April 11 to April 30, 2015 Operator IZ3BUR Livio will be on air in the spare time, mainly on 20-15-10-6 m SSB and PSK3... Read more
By Javier Argüello Long before Twitter and Facebook, amateur radio community shared their virtual lives. Age 60, Alv Våge received notification tha... Read more
“Worlds smallest APRS transceiver with TNC” offers many applications. Matchbox-sized, built-in GPS receiver. The transceiver can not only... Read more
General description of the OM1002+ solid state amplifier for 144 MHz VHF band The OM Power model OM1002+ is a single band, solid state amplifier, des... Read more
New from Hi-Q Antennas Initially Developed for NASA as a space bound NVIS antenna For ground penetrating HF Radar antenna. It is available for Shipboa... Read more
2m – 144MHz Dual Polarity Yagi Antenna PA144-XPOL-18-5. Wideband operation 144 – 145 MHz. Cross Polarized “XPOL” Yagi antenna... Read more
Recent Posts
New QST QuickStats Poll Posted
Yaesu FT DX3000 Review [ Video ]
725GHz first QSO!
ZUMSpot RPi PiStar Hotspot Review
Loretta gets ham radio licence at 91
ARRL Foundation Scholarship Program is Now Accepting Applications
Yaesu FT-DX101D HF/50MHz 100W SDR
Listen to Christmas in Antarctica
J52HF – Guinea Bissau
Amateur Radio: the first social network
PicoAPRS with GPS receiver
OM1002+ OM Power Solid State amplifier for 144 MHz VHF band
NVIS Antennas by Hi-Q Antennas 2-30 MHz
2m 18 elements XPOL Yagi antenna PA144-XPOL-18-5
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