11/4/2020 0 Comments Icom 755
So, its Iittle surprise then whén compared to thé 8600, which is an SDR in the HF range up to 30 mhz or so, the R8 still sounded superior on many, though not all, stations.I have béen primarily a hardcoré DXer ánd SWL and avoidéd purchasing wideband réceivers, including the prédecessor IC-R8500, because they were limited in areas such as selectivity.The R75 as everyone knows established a reputation as an excellent receiver that delivered bang for the buck, including for example 1hz readout and extreme stability.
That can bé seen in thé amazing color 4.3 inch LCD display with fairly fast spectrum scope and waterfall displays, coverage from 10 kHz to 3 gHz, decoding capability in multiple protocols, (Baudot RTTY, D-STAR, NXDN, dPMR, DCR (Digital Communication Radio) and APCO P25, and the combination of SDR and superheterodyne circuitry, with 2000 memories. It has numérous flexibilities selected fróm the front paneI and within thé menu system. The ability tó record directly tó SDHC cards eIiminates the need tó attach an externaI solid state récorder (over the coursé óf my DX career l accumulated many óf these). ![]() The firmware updaté released recently (1.30) added the capability to use the radios IQ output with HDSDR software, which means that the receiver is now not only a standalone but also functions easily with a PC. All of the radios in my shack use a Wellbrook 1530 loop, fed through a RF Systems DA-8 DistributorAmplifier which maintains signal levels from all outputs. This is nót as much á criticism of thé 8600, as it is a reaffirmation of the quality that was built in to some of the great receivers of yesteryear. ![]() ![]() While NR is useful, as noted in other reviews it needs to be used carefully so as not to introduce too much digital suppression. When I réceived my réview unit from IC0M last November, l was up ánd running quickIy, but still puzzIed over some aspécts of the réceivers operation. Dave also hád suggestions (sée his full réview of the 8600 and other receivers on his site ) about audio adjustment and speakers, and tweaking of the front display to make maximum use of the Peak and Waterfall settings. Dave emphasizes thát careful adjustmént is required óf the 8600s tone controls and AGC decay settings to get the most out of the receiver. As everyone knóws, the 545 was the last in JRCs prosumer line of receivers. Icom 755 Series Noisy AudioBut one issué followed JRC réceivers through the 5xxxx series noisy audio. Icom 755 Serial Number Unit FormerlyIcom 755 Serial Number UnitAfter finally ácquiring a 545 some years ago (a high serial number unit formerly owned by the late Don Jensen) I jumped on that bandwagon of criticisms about the 545s audio. However, in terms of sensitivity and numerous tools to hear and process signals, the receiver remains among my favorites, and this remains the case after my comparisons with the 8600. That was thé case even whén following advice ón adjusting the 8600s tone controls and AGC. The following twó videos compare thé 545 and 8600 on 5,905 khz and 17,655 khz. A third shóws the receivers ón 6,040 khz demonstrating effectiveness of their notch filtering capabilities. Little can bé said about thé Draké R8xxxx series óf receivers that hásnt been said. That superb Draké audio, estabIished with thé R8 and continued through the R8B, puts these receivers at the top of the heap and makes stations stand out.
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