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Icom IC-R72

Manual

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Icom IC-R72About Icom IC-R72
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User reviews and opinions

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Comments to date: 9. Page 1 of 1. Average Rating:
Andrew Vandever 12:21pm on Saturday, October 30th, 2010 
It was fast fun and easy. Stuck the cassette in plug in my MP3 player and listen to good quality music with no static. Easy Setup","Good Quality".
hubbabubba 6:40am on Saturday, August 21st, 2010 
The silicone fittings are changeable so you can choose the right size for your ears. Bad thing about that is that they tend to fall off now and then. Not only do I like bacon, but I love the way it smells when it is cooking Inexpensive, but sound great The wire is a little thin. Not a big deal.
j.renuart 11:09am on Sunday, July 18th, 2010 
Sound quality??? After reading other review I am extremely surprised at what I am listening to. Amazing Creative EP-630 In-Ear Noise-Isolating Headphones (Black) I got a pair of these when I ordered my XPS computer system back in 2008.
son_t 12:59am on Friday, July 16th, 2010 
I must be a compulsive headphone buyer. I have a lot of headphones at home, most inexpensive and not all are being used.
7stg 11:29pm on Friday, May 28th, 2010 
The only issue that I have found is that the rubber ear buds can compress at times - I simply pull them back out, but it can be anoying at times.
cfeyrer 4:30am on Friday, April 30th, 2010 
Heralded by the headphone enthusiast community as the KSC75 of ear buds. Headphones Arrived quickly. Earphones work very well but no good if your lug holes are smaller than the average person.
Standefer 10:12am on Friday, April 9th, 2010 
Hello Bargain Hunters! lightweight, great sound, wide range, comfy none Placement of the headset in the ear of the Creative EP630 with coverage from rubber provide a fantastic experience audio in MP3 format.
kimber 3:23am on Thursday, March 25th, 2010 
My first IEM were "Koss Spark Plug" ( 2 pairs ) and I thought they were good, but after trying EP-630 I forgot "Plugs" like a horrible nightmare. These came with my Dell XPS 1530 and I tried them for the first time and really was impressed. These came with my Dell XPS 1530 and I tried them for the first time and really was impressed.
rewtal 8:41pm on Thursday, March 18th, 2010 
Creative EP-830 Noise Isolating Earphones Very disappointed with these earphones, i bought them off the back of very good reviews i had read.

Comments posted on www.ps2netdrivers.net are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.

 

Documents

doc0

Preparing the R72 for DRM reception
I will describe here the (simple) steps needed to be able to receive DRM (Digital Radio Mondiale) with the fantastic Icom IC-R72 but first let me state it very clearly: do it at your own risk. I will accept no liability for any damage you will do to your radio, to yourself or to this sector of the Universe by following the procedure outlined in this document. The basic idea is to extract the IF signal (at 9.0106 MHz) in an non-invasive way, and to carry it to a down-converter that will convert it to 12 kHz; then it will enter the PC Sound Card, and a piece of software like DREAM will do the magic and convert the digital signal into clean, crisp audible signal. You will have to remove both top and bottom covers of the radio; you will have also to remove the top board (Regulator Unit), to reach the PLL unit. Follow the instructions at page 24 of the users manual (section: Disassembly). My R72 does not have the optional CW-Narrow filter installed. This is indeed very convenient, since I can extract the signal from there. All you need is a short piece of coaxial cable (RG174 is perfect to this purpose), terminated with short, rigid conductors (see Figure 1) that can be used like pins, to be inserted into the empty filter slot (See Figure 2). This was you dont need to solder anything on the circuit board of the radio, and the cable can be instantaneously removed later, should you decide to undo the modification. Figure 3 shows the cable already inserted (pushed) in the empty filter slot; please note the correct position of the ground and centre conductors. The cable is the routed to the unused RCA connector located on the back of the radio, and marked as 48 - spare jack (page 6 of the users manual). Solder the coaxial cable to the jack as shown in Figure 4, noting that you have to cut open the thin conductor that shorts the jack. I inserted a small 10nF capacitor in series with the inner conductor of the coaxial cable, to provide DC isolation (decoupling), and protect the radio. Congratulations your work in the radio is now finished ! You can close the radio now. Now, when you select the CW-N position, the IF signal is automatically routed to the back jack connector, and it is available for a downconverter. I decided to keep the downconverter outside the radio, but it can be located internally if you wish so. I purchased mine already assembled from I5XWW, but there are several other
manufactures out there check ebay too; or you can roll you own. Just be sure that they are set to work with ICOM radios, i.e. they convert 9.0106 MHz to 12 kHz. Installing the DREAM software was a breeze, and everything worked fine right away just remember to check the Flips Input Spectrum box in the Evaluation Dialog Box (we are using CW, so the spectrum is reversed). Please note that there will be no audio coming out of the radios speaker, since the IF signal is diverted out of the radio. Moreover for the same reason the AGC is NOT working, so if the radio signal is very strong, you will have to use the manual attenuators/preamp. Contact me if you want to exchange ideas at: iz2eas@arrl.net Enjoy your R72 ! 73, Michele
Figure 1: RG174 coaxial cable is terminated with rigid, short conductors
Figure 2: pins are ready to be inserted in the slot.
Figure 3: pins are inserted in CW filter slot.

Figure 4: cable is routed to the SPARE JACK, and soldered to it. I inserted a small 10nF condenser in series with the inner conductor, to provide DC isolation.

doc1

Fixing the Audio Drop-out problem of the Icom IC-R72
My beloved R72 eventually developed the audio-dropout problem, that seems to be a very common failure of these receivers. What I will describe here is a simple procedure to fix it. But first let me state it very clearly: do it at your own risk. I will accept no liability for any damage you will do to your radio, to yourself or to this sector of the Universe by following the procedure outlined in this document. The symptom The symptom is simple and scaring: there are audio dropouts in various segments of the bands; actually, the receiver stops receiving for few kHz; these mute segments of bands are periodically repeated every 512 kHz. Sometimes the problem goes away after few minutes of warm-up. It gets worse and worse with passing time. The diagnosis The cause is the DDS (direct digital synthesizer) losing lock because of drift, due to aging. Let me be more specific: in the PLL loop there is a VCO (called sub-loop) that spans 512 kHz of frequency, from 62.05 MHz to 62.56119 MHz; because of aging this VCO drifts so much that the PLL is no longer able to make it work at the right frequencies, and it stops working. Luckily the solution is VERY simple, it takes no more than 15 minutes and the only tools you need are a DVM (Digital Volt Meter) and screwdrivers to open the radio. The cure What you have to do is described at page 7-2 of the Service Manual, at the paragraph entitled "DDS LOOP" (middle-page); actually, you can connect a DVM to L42 instead of the oscilloscope, since what we are measuring is the DC voltage that drives the varicap of the VCO. In my case at 14.12650 the DVM reading was 0.1 V DC (instead of 1.0 V), and at 14.12649 the reading was 1.1 V (instead of 2.0 V). Guess what: when cold my R72 was loosing lock around 14.12650
To fix it I had to gently squeeze L30 with two fingers to bring the values of the DC voltage back in spec; obviously when you touch L30 with your fingers (or with a nonplastic tool) the oscillator stops working; so the procedure is: 1) Get a copy of the Service Manual, a DVM and a set of screwdrivers 2) Open your radio to access the PCB below the power supply (Figure 1) 3) Remove the cover of the DDS oscillator (circled in Figure 1 and Figure 2); you can simply pull it out, since it is not soldered in place 4) Connect a DVM to L42 (red arrow A in Figure 3) and ground 5) slightly squeeze with your fingers (or expand, depending on the actual situation of your VCO) L30 (arrow B in Figure 3) 6) Remove your fingers or tools 7) Read the DVM 8) If the reading is still far from the specifications repeat from point 5) You can refer to the photos below to help you in the process. Feel free to contact me if you want to exchange ideas at: iz2eas@arrl.net. Enjoy your R72 ! Michele IZ2EAS (iz2eas@arrl.net)
Figure 1. Circled is the cover of the DDS that must be removed; just pull it out, it is not soldered in place.
Figure 2. Circled is the DDS with its cover removed.
Figure 3. Zoom-in of the DDS circuit. Connect the (+) terminal of the DVM to A (L42), and squeeze (or expand) the coil B (L30). Note that there is no need to remove the original paraffin.

 

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