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#41
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#42
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In article ,
Sel wrote: Telamon wrote: I'm glad you are happy with the R75 but I have read the manual and I So, you haven't actually used or owned one? but you are happy to tell others not to buy! Well Sel in a perfect world I would but I don't have unlimited time and money so I've done the next best thing and researched it. I've read many different people opinions that do own it, read the manual, read about the design modifications to get the R75 up to speed. The R75 has nothing new in the way of features or performance that I already have with the other radios I own. And? And what? I would not call the way the squelch / RF gain knob operates as intuitive and from reading the manual See above. So what are you trying to say, that another aspect of the radio does not follow the operation instructions in the manual? it seems to me a novice could I didn't say a novice could not just that they could more easily get themselves in trouble with the R75. I would not call the AOR7030+ a beginner radio either. easily get the radio in a condition where nothing would be heard from it or have the sound grossly distorted. This has never happened to me. Well good for you. It seems to me you qualify for the title of expert. Someone who helps people go wrong with confidence. Thanks for conferring the title of expert upon me. -- Telamon Ventura, California |
#44
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Pete KE9OA wrote:
snipped On the subject of the R75, I know, the sync detector isn't the best in the world Pete, Have you thought about incorporating one of your sync' detector designs to the R75? It might prove to be the ultimate sync' mod for it. -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#45
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"Pete KE9OA" wrote in message
I can't comment on some of these receivers, but I can comment on the AOR7030. Meets its specs? Maybe, but after 1 year of use, some unadvertised "bonuses" were thrown in. The mode switches have developed bounce problems which could have easily been addressed in software. The mechanical tuning encoder has been noisy since day one, sometimes "scanning" the frequencies on its own. The sensitivity is definitely not on a par with the R75. I don't care what the unit is specified as; the MDS on the R75 is better. According to Dave Zantos, the 7030 Plus isn't much better. On his sample unit, the optical encoder shaft developed a wobble after about one year. His 7030 Plus had a low level background noise on signals that wasn't present with the 7030. It is suspected that the removal of the shielding from the synthesizer might be causing the problem. I do have both the R75 and the AOR7030, and after two years, the R75 has not had any problems surface. If the 7030 wasn't a Christmas gift from my wife, I would have sold this unit a long time ago. On the subject of the R75, I know, the sync detector isn't the best in the world, and the "large front mounted speaker" is a joke, but in terms of RF handling, selectivity, etc, the R75 is a very good receiver. Normally, I don't step into this kind of discussion, but sometimes, there is more than meets the eye in this situation. If anybody doesn't like the R75, that's fine...................still, it is a fairly good receiver, especially for the 450 dollar price tag that this unit is being sold for. Okay, the sync detector doesn't work. Hi Pete nice review.About the R75 sync det,Kiwa CO have a fix for it: Synchronous Detector Upgrade Kiwa provides two major upgrades to the Synchronous Detector. Together they provide enhanced performance where the PLL stays "locked" under the most difficult signal conditions.The first upgrade is best described as a "dual speed control voltage". The control voltage for the PLL filter is tuned within an optimum window that is determined by signal conditions.The response is slow to maintain a "centered" condition. A second circuit provides the control accuracy to react to fast flutter fading and noisey conditions. These two circuits provide a dual speed control for the PLL. The second major upgrade is to the Synchronous AM AGC. The dual speed technique is used again to first center the AGC but still allow for quick short changes in AGC characteristics as required by signal conditions.In the yahoo R-75 group we have two other sync det mod projects,one of this mods use a comparator[339]and work very good and the cost is less than $7.00 for the total mod.I'm using your Pete's [sensitivity mod] and now this receiver shine in the MW band.After did your mod I tested it with a drake R8B and for hard core dxing the Icon won hands down,thanks for the R75 exceptional quit circuitry,the help of its nice DSP and your well designed sensitivity mod. |
#46
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starman wrote in message ...
Pete KE9OA wrote: snipped On the subject of the R75, I know, the sync detector isn't the best in the world Pete, Have you thought about incorporating one of your sync' detector designs to the R75? It might prove to be the ultimate sync' mod for it. Yes an maybe better than the R8b sync det [a very good one] but not perfect Pete is a great designer and he inspired and working very hard now in his sync det project.My own R-75 sync det [with a 339 comparator mod] is working for me an greatly reduce fading distortion and diminishing and eliminating adjacent channel interference and is sideband selectable [manually] using a 2.4 stock filter and selecting manually [with the twin PBT] the less interfered of the two sideband.Yes the R8b sync use a different aut sync circuity but if my R75 sync det is working ok, then what is the motive for keep yearning for the "ultimate sync"? |
#47
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In article
, "Pete KE9OA" wrote: I can't comment on some of these receivers, but I can comment on the AOR7030. Meets its specs? Maybe, but after 1 year of use, some unadvertised "bonuses" were thrown in. The mode switches have developed bounce problems which could have easily been addressed in software. The mechanical tuning encoder has been noisy since day one, sometimes "scanning" the frequencies on its own. The sensitivity is definitely not on a par with the R75. I don't care what the unit is specified as; the MDS on the R75 is better. According to Dave Zantos, the 7030 Plus isn't much better. On his sample unit, the optical encoder shaft developed a wobble after about one year. His 7030 Plus had a low level background noise on signals that wasn't present with the 7030. It is suspected that the removal of the shielding from the synthesizer might be causing the problem. I do have both the R75 and the AOR7030, and after two years, the R75 has not had any problems surface. If the 7030 wasn't a Christmas gift from my wife, I would have sold this unit a long time ago. On the subject of the R75, I know, the sync detector isn't the best in the world, and the "large front mounted speaker" is a joke, but in terms of RF handling, selectivity, etc, the R75 is a very good receiver. Normally, I don't step into this kind of discussion, but sometimes, there is more than meets the eye in this situation. If anybody doesn't like the R75, that's fine...................still, it is a fairly good receiver, especially for the 450 dollar price tag that this unit is being sold for. Okay, the sync detector doesn't work. I remember the NRD545 review a few years back. When the author of the article questioned JRC about the ultimate rejection problem of the DSP section ,he was informed that JRC didn't have any intention of addressing this problem. In another thread in this newsgroup, I read that there was a mod to clean up the "monkey chatter". What I find interesting about this discussion is that I can't express my opinion on the R75 without people responding with complete illogic and in addition they insist on adding to the meaning of what I wrote. I made specific and clear reference to what I objected to as design and not QC problems. Whether another radio has QC problems or not has nothing to do with my objections to the R75. Whether or not someone has a different performance issue with another radio has nothing to do with my objections on the R75 either. The cost of another radio has nothing to do with my objections with the R75. I don't care if it was offered for $45 bucks I don't want it. I'm not a youngster and in the past I have taken the cheap route out of necessity. Turns out I was never happy later on and found I was better off waiting and saving for what I really wanted so the cost argument falls on deaf ears. So reading between the lines does that mean I think someone is an idiot for buying this radio. No. The R75 has good things going for it and some people are willing to overlook my objections or fix them. Fine with me that's their decision. The R75 modified or not works well for people that use it in a way that does not interest me. Modified or not the R75 will not work as well as the radios I own in the way I use them, which is program listening. I prefer working on antenna performance instead of buying a radio I would to modify to suit my preferences. Those are my preferences, opinion and I don't think people that differ from it are nuts. Telamon wrote in message ... In article , (Kenneth) wrote: Telamon wrote in message . For example a ten-tec RX-340? This one have some flaws too and cost $3,950.The sync selectable sideband lose look relatively easily,Passport recomend an external Sherwood SE-3 [500.00],poor dynamic range,static crashes sound harsher than on analog receivers.Spurious signal noted around 6MHZ segment,notch filter does not work in AM,Sync selectable sideband or ISB modes,Noise blanker not effective ect, ect, ect,.What about a Drake R8B? Cost $1,495, This one have a lot of flaws too,for example the power supply run very hot,[a remedy is to use an external power supply],bassy sound "virtually requieres a outboard speaker" [Passport],a cheap mechanical encoder used to have an above -average failure rate [Why not an optical one like in the AOR 7030+],a lot of birdies and background hiss [from the synthesizer board and some poor shielding and grounding techniques ect ect ect..... But what about companies like Ten-tec and drake .Ten tec owners are still waiting for the RX-350 sync det fixing and others flaws fixing[check the complains in the RX-350 yahoo group].What about the Ten Tec flaws that you can read in passport to world band? Why they don't fix then? An now we are talking about a $3,999 receiver.What about Drake R8b encoders,birdies,synthesizer circuit noise ect ect,?All companies including Icom make excuses and try to compensate with more advertizings in shortwave radio guides.But the difference with Icom is that they decrease the R-75 price form $1,100 to $450.00 or $525.00 and are including a free DSP but Drake and others are increasing the price of their receiver but they are not raising the quality standards,. It is reasonable to differ over wants and needs but specifications or facts are generally not arguable. If you misunderstand what someone has wrote and continue to argue some point (several actually) as you have been doing your credibility will be zero. "If you have a glass roof don't throw stones to others".I did the tests and I did the research looking for others experiences,expert reviews,an articles and after dozens of e-mails received from others honest drake and ten tec owners that want to fix their receivers flaws and not hide the facts [their receivers flaws] under the rug I react to others postings.If you check the R-75 yahoo group you will see honest owners sharing the pro and con of the R-75 and in the process finding the answers and solutions to their radio few problems.The myth of the perfect receiver without any flaw was found to be false.For example check the passport reviews and see for yourself all the ten tec 340 flaws that they found.If for you, passport credibility is zero thats ok with me,but if you like to go to a group like this posting about why you don't like the Icom receiver this is your privilege but don't begin to groan and talk about "zero credibility" if someone point out your own receiver faults. Well Kenneth it you keep on making false statements that¹s what you will have ³zero credibility.² And it does not help your arguments to redirect issues either. Try staying on point. I tried being polite and that didn't work so now I'll be more direct. You have a reading comprehension problem. One radio (R75) does not meet its published specifications and all the others in the discussion (RX340, R8B, AOR7030+) do meet their stated specifications and function. You read the manual and operate these three radios and you get what you expect. You read the R75 manual and you don't get what you expect. If that does not get through to you I give up. You have to modify the radio to get it to work as described. -- Telamon Ventura, California -- Telamon Ventura, California |
#48
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#49
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So I Said To Myself... SELF !
How Effective are these Modifications to the Icom IC-R75 Owner ? { The Icom IC-R75 Question -&- The Question of the Icom IC-R75 } I guess that there is value, Value. and VALUE ! "value," = Simple Cost of an Product or Service. "Value." = Cost and Benefit = Cost Benefit Analysis (CBA). "VALUE !" = The 'personal' "Value" that an Individual or a Group places on, or assigns to, a Product or Service. (The Social Dynamic {Status} of the Purchase and Ownership.) EXAMPLE: Drake R8_ Owners -=V=- Icom R75 OWNERS. * The Drake R8_ Owner may have the better radio out of the box and takes pride in owning a higher prices radio. TBL: The Drake R8_ has "Value." * The Icom R75 OWNER gets a lower cost radio and does, or has done, some Modifications to the basic radio. The Icom R75 now becomes "MY ICOM R75" the Icom R75 Owner becomes and "OWNER" and through the Modification Process developes a 'personal' Relationship with HIS "R75". TBL: The Icom R75 has "VALUE !" to the Icom R75 "OWNER". Sort-a-Like Automobiles: * The 'average' "New Car" Owner Likes their New Car and Enjoys Driving It. (Has the Status that a New Car Confers.) * The 'individual' who OWNS and Older Restored Car from the 1950s - 1960s (The Golden Age of Automobiles) has a 'personal' "Relationship" with MY CAR. TBL: Love It -or- Hate It = ITS "MY" CAR ! The Psychology of Ownership - - - = = = V = = = - - - The Psychosis of OWNERSHIP ! (YES - It's a Fine Madness !) awc? ~ RHF = = = Are We Communicating ? .. .. = = = = = = (RHF) wrote in message . com... STARMAN, "BTW- I guess it was just a matter of time before this subject came around again. I think it's clear who got it going. This will be my only reply. I don't care who gets the last word." POF - Actually it all re-started when "BH" posted this and never responded after two requests for details and facts. * * * * B O M B S - A W A Y * * * * Bill Hennessy ) Subject: Icom R-75 question Newsgroups: rec.radio.shortwave Date: 2003-12-29 11:40:58 PST Icom has quality control problems. Thay work great, when thay work. Bill, N5NOB - - - - - - - - - - - - - - - - - - wmcis ~ RHF . . = = = starman = = = wrote in message ... All receivers have design problems. The design of any receiver is a compromise of cost vs. performance. I prefer to pay more for a receiver that doesn't need many (if any) mod's, than to pay less up front and then spend more time and money to get it working acceptably. BTW- I guess it was just a matter of time before this subject came around again. I think it's clear who got it going. This will be my only reply. I don't care who gets the last word. .. |
#50
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The reviews I read before purchase did not sing any praises for the
IC-R75s speaker so I had mine shipped directly to Kiwa for the following mods: --synchronous detector upgrade --audio upgrade --high fidelity audio filter --R75 filter module The sound is just fine, though for obvious reasons I can't compare it now to what is would have sounded like. The tiny speaker the R75 has can't sound very good. If you are going to spend the money for those modifications then spend a little more and buy an external speaker. That was my intent all along before I actually got it and listened to it with the mods. Now I'm not really in a hurry as the sounds if fine. When dx'ng I plug in my Grado SR80 headphones. I find it more useful to read opinons from ppl who have actually used a product. Kiwa's synch upgrade is top notch and I second the positive comments for this mod. Had no qualms with sending my unit directly to Kiwa as after several e-mails back and forth between Kiwa and iCOM they pretty much said that the warranty would still be good as long as the mods were done "cleanly". ymmv. |
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