ICOM » IC-R75 — Price & Specifications

Triple-conversion HF desktop receiver. Analogical configuration, frequency range 0.03-60 MHz MHz all-mode. With Sync-AM and pass-band tuning (PBT). Ideated in Japan, year of introduction 1999.

Reference market : ham-radio

General :
Frequency coverage [1] 0.0300 ~ 60.0000 MHz
Modulation mode CW / RTTY / LSB / USB / AM / AM-S / FM
Tuning step 1 / 10 Hz
1 MHz
Receiver :
Sensitivity SSB / CW 2.0 uV (0.1~1.8 MHz, 10dB S/N)
0.16 uV (1.8~30 MHz, 10dB S/N)
0.13 uV (50~54 MHz, 10dB S/N)
RTTY 2.0 uV (0.1~1.8 MHz, 10dB S/N)
0.16 uV (1.8~30 MHz, 10dB S/N)
0.13 uV (50~54 MHz, 10dB S/N)
AM / AM-S 5.6 uV (0.1~1.8 MHz, 10dB S/N)
1.6 uV (1.8~30 MHz, 10dB S/N)
1.0 uV (50~54 MHz, 10dB S/N)
FM 0.22 uV (28~30 MHz, 12dB SINAD)
0.2 uV (50~54 MHz, 12dB SINAD)
Selectivity SSB / CW > 2.1 KHz (-6dB)
< 4.0 KHz (-60dB)
RTTY > 2.1 KHz (-6dB)
< 4.0 KHz (-60dB)
AM / AM-S > 6.0 KHz (-6dB)
< 20 KHz (-50dB)
FM > 12 KHz (-6dB)
< 30 KHz (-40dB)
IF-filter ultimate attenuation [2] 80 dB
Dynamic range [2] 95 dB (50 KHz spaced signals)
67 dB (5 KHz spaced signals)
Blocking [2] 119 dB (100 KHz spaced signal)
Image rejection > 70dB (0.1~30 MHz)
AGC Fast, slow, OFF
Frequency stability ± 7ppm max within 60' warm-up
± 1ppm/h max with temperature of 25°C
± 5ppm max with temperature from 0°C to +50°C
Intermediate frequency 69.0100 MHz (AM / AM-S)
69.0105 MHz (RTTY)
69.0106 MHz (CW)
69.0115 MHz (LSB / USB / FM)
9.0100 MHz (AM / AM-S)
9.0105 MHz (RTTY)
9.0106 MHz (CW)
9.0115 MHz (LSB / USB / FM)
450.0 KHz (AM / AM-S / FM)
455.0 KHz (LSB / USB)
455.9 KHz (CW)
456.0 KHz (RTTY)
Features :
Memory 99 regular memories
2 for programmed scan limits
Display 30-segments signal meter bar
Antenna SO239 50Ω connector
Terminal jack 500Ω (0.03~1.8 MHz)
Power supply 13.8 VDC external
Power consumption 1100 mA typ
900 mA squelch on
Audio power 2 W with an 8Ω load
Audio output Jack 6.35 mm headphone
Jack 3.5 mm audio
PC connection CI-V on Jack 3.5 mm
Mechanical and environmental data :
Operating temperature from 0°C to +50°C
Dimensions 241 (W) x 94 (H) x 229 (D) mm
Weight 3kg

[1] 0.1 ~ 30 MHz and 50 ~ 54 MHz specifications guaranteed
[2] This parameter, not in official data, was obtained with direct tests

Description :

The IC-R75 is a receiver with a peculiar history. With this model, the manufacturer has covered the gap left by the old R71, a valuable device in its period, due to the fact that the direct successor in time line, ie the R72, lacked functionality that became standard in other receivers. Although technologically outdated with regard to some circuit solutions, the IC-R75 is offered [2012, US market] in conjunction with the DSP module UT-106 dedicated to digital noise reduction (DNR). This module originally was an option.

The receiver has a limited number of commands on the front panel, so it is easy to operate, while integrating several functions. Among these the synchronous AM, the IF pass-band-tuning (PBT) with lower and upper cutoff frequencies independent adjustment, noise-blanker, automatic notch filter, DNR, AGC time constant selectable between two values or also off, continuous gain regulation in the IF stage, squelch, two RF preamplifiers, RF attenuator, internal clock and on / off timer. Tuning set by means of a rotary control, with direct input from the keypad, or even remote from a PC. The display is alphanumeric LCD, to facilitate the recognition of individual memory locations it is possible to associate a label up to 8 characters long, S-meter bar with good resolution to appreciate variations in the signal strength of 3dB up to S9. Standard search options: between band limits, within memories, on priority channel.

There are two positions for the installation of optional filters, one for the 2nd conversion IF and one for the 3rd conversion. Several the compatible models giving the user a considerable flexibility for the choice, the components are in the following table.

Filter Mode IF Bandwidth
FL-52A CW 455 KHz 0.5 KHz (-6dB)
1.0 KHz (-60dB)
FL-53A CW 455 KHz 0.25 KHz (-6dB)
0.48 KHz (-60dB)
FL-96 SSB 455 KHz 2.8 KHz (-6dB)
FL-222 SSB 455 KHz 1.8 KHz (-6dB)
3.0 KHz (-60dB)
FL-257 SSB 455 KHz 3.3 KHz (-6dB)
FL-100 CW 9.0106 MHz 0.5 KHz (-6dB)
1.6 KHz (-60dB)
FL-101 CW 9.0106 MHz 0.25 KHz (-6dB)
0.8 KHz (-60dB)
FL-103 SSB 9.0115 MHz 2.8 KHz (-6dB)
5.0 KHz (-60dB)
FL-223 SSB 9.0115 MHz 1.9 KHz (-6dB)
3.6 KHz (-60dB)
FL-232 CW / RTTY 9.0106 MHz 0.35 KHz (-6dB)

Performance and practical notes :

In general terms the behavior in SSB and AM mode is adequate for the needs encountered in practical use, but not when extreme conditions exist. The dynamic-range on interfering signals placed at a great offset in frequency is in fact on good level, the contrary for few KHz separations where the effect of degradation becomes appreciable. This is due both to the excessive oscillator phase noise and to the mediocre ultimate attenuation guaranteed by the supplied IF quartz filters. The same filters, also having a bandwidth that satisfies most of the listening needs, are characterized by a mediocre form factor. This last point is perhaps the most critical element of the receiver. Directly a selectivity with insufficient slope in the response curve poses problems in handling amateur radio or utility traffic in crowded bands, indirectly this flaw is then emphasized with the use of the PBT that can not take full advantage of its potential. The possibility of installing one or two optional IF filters, with an optimal 6/60 dB ratio, significantly improves the performance. Some distributors to meet these requirements place on the market already receiver with an IF filter characterized by a better form factor. Pay attention to this aspect when evaluating a purchase. It should be noted that the receiver does not have a notch filter at the IF, the effective selectivity can not therefore be altered beyond the action of the pass-band tuning.

As with many other HF devices, the sensitivity is automatically reduced for frequencies below 1.8 MHz. Receiving test using the digital noise reduction function, obtained with the UT-106 module, has highlighted the usefulness of this processing without reaching high levels of sound improvement - this is probably due to a design not updated in the algorithms compared to the recent solutions.

IC-R75 price :

We have collected for your convenience the IC-R75 ICOM sales prices and their trend over time. Of course offers, accessories, warranty terms and conditions can lead to different figures.

Price Date Condition
GBP 400,-- 2018-oct Second Hand

Good condition overall and perfect working, has the optional DSP UT-106 fitted. Also supplied a 13.8V / 5A high quality regulated power supply unit. Original box. This is completely stock and has not been hacked about with any modifications at all.

Valuation :

Dynamic range
Spurious response
Signal functions
Control functions
User friendly

Stars: 1=insufficient, 2=just sufficient, 3=mediocre, 4=good, 5=excellent

Review :

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