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#1
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Hi Randy,
At the Madison, Wisconsin gathering a couple of years ago, one of the folks brought along his CCRadio. I brought a couple of mine along, and we just let the CCRadio sit along, looking happy. While the CCRadio is a good receiver, this new unit of mine will be ten steps above that in performance. The units that I have built so far have been pretty comparable in performance to my Racal 6790/GM. Another analogy..................picture a Collins 75A-4, and picture it with an antenna with performance better than a Palomar loopstick antenna, but not quite as good as the large Kiwa antenna, and..............you get the drift. Even with a 6kHz Murata ceramic filter, the skirt selectivity is steep enough that you can separate the sideband components from the carrier of an AM signal. I think that you would be very pleased with the product. It's going to be a winner. Pete Randy Padawer wrote in message om... Pete, I have no doubt that you can do it, but it strikes me that your radio will need to be darned good to beat CCrane's "CCRadio Plus." Maybe others will disagree, so I'm ready for the education I deserve if that's the case. However, as it stands now, I'm pretty impressed with that commercially available receiver. Randy (WA4FJF) |
#2
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Wow, Pete, well I'll likely be a customer!
Randy (WA4FJF) "Pete KE9OA" wrote in message ... Hi Randy, At the Madison, Wisconsin gathering a couple of years ago, one of the folks brought along his CCRadio. I brought a couple of mine along, and we just let the CCRadio sit along, looking happy. While the CCRadio is a good receiver, this new unit of mine will be ten steps above that in performance. The units that I have built so far have been pretty comparable in performance to my Racal 6790/GM. Another analogy..................picture a Collins 75A-4, and picture it with an antenna with performance better than a Palomar loopstick antenna, but not quite as good as the large Kiwa antenna, and..............you get the drift. Even with a 6kHz Murata ceramic filter, the skirt selectivity is steep enough that you can separate the sideband components from the carrier of an AM signal. I think that you would be very pleased with the product. It's going to be a winner. Pete |
#3
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That sounds good, Randy. I will be going over a few more of the details
today. I do like that modularized approach. If I use a TDA1572 as the 2nd I.F. subsystem, it is easy to have an I.F. output jack, as well as the ability to add a Sync detector further on down the line. Pete Randy Padawer wrote in message om... Wow, Pete, well I'll likely be a customer! Randy (WA4FJF) "Pete KE9OA" wrote in message ... Hi Randy, At the Madison, Wisconsin gathering a couple of years ago, one of the folks brought along his CCRadio. I brought a couple of mine along, and we just let the CCRadio sit along, looking happy. While the CCRadio is a good receiver, this new unit of mine will be ten steps above that in performance. The units that I have built so far have been pretty comparable in performance to my Racal 6790/GM. Another analogy..................picture a Collins 75A-4, and picture it with an antenna with performance better than a Palomar loopstick antenna, but not quite as good as the large Kiwa antenna, and..............you get the drift. Even with a 6kHz Murata ceramic filter, the skirt selectivity is steep enough that you can separate the sideband components from the carrier of an AM signal. I think that you would be very pleased with the product. It's going to be a winner. Pete |
#4
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I'm getting excited about this new MW receiver. I have the CCRadio
and believe it's reception is only fair, with poor selectivity compared to my Grundig Satellit 800. Even my Grundig S350 is better than the CCRadio. My biggest problem with MW is interference from hologen lamps, dimmers, etc. I don't know if there is any NB that will eliminate this type of interference. What I would like to see is: A portable with a large enough quality speaker to get a decent bass response, separate tone controls (or even better, a graphic equalizer tailored to reduce certains frequencies associated with different types of interference), at LEAST two GOOD bandwidths, a superior built-in directional antenna, and of course a selectable sideband option would certainly be nice. If your set is a real step up from what I currently have, I will definitely be a buyer! |
#5
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On Wed, 10 Sep 2003 11:25:58 -0500, Gary wrote
(in message ) : I'm getting excited about this new MW receiver. I have the CCRadio and believe it's reception is only fair, with poor selectivity compared to my Grundig Satellit 800. Even my Grundig S350 is better than the CCRadio. My biggest problem with MW is interference from hologen lamps, Generally, there is no interference from halogen lamps themselves, I have two in my radio room and there is no interfernce whatsoever from them. However (and you knew this was coming, right? grin) these have off-lo-hi switches. I have one in the living room which has a dimmer switch and it tears up anything that gets close. Some of this latter design will even interfere when they're turned off. dimmers, etc. I don't know if there is any NB that will eliminate this type of interference. What I would like to see is: A portable with a large enough quality speaker to get a decent bass response, separate tone controls (or even better, a graphic equalizer Over the years, I've used from one tone control to nine and the simplest that worked well was three controls, the standard trebel and bass and a "midrange" that covered (typically) from 300 to 3000cps/Hertz. tailored to reduce certains frequencies associated with different types of interference), at LEAST two GOOD bandwidths, a superior built-in directional antenna, and of course a selectable sideband option would certainly be nice. If your set is a real step up from what I currently have, I will definitely be a buyer! Gray |
#6
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Thanks, Gary. I think that a portable will definitely be on the horizen, and
the tone control circuit is beginning to sound like a better and better idea. I think that this can be implemented into the design. The main thing is the choice of turnover frequencies of the tone control circuit, for the best sound. Back in the early to mid 90s, I used to design and build custom acoustic instrument amplifiers, so I've got a bit of experience with tone control circuitry. Thanks for those comments! Pete Gray Shockley wrote in message ... On Wed, 10 Sep 2003 11:25:58 -0500, Gary wrote (in message ) : I'm getting excited about this new MW receiver. I have the CCRadio and believe it's reception is only fair, with poor selectivity compared to my Grundig Satellit 800. Even my Grundig S350 is better than the CCRadio. My biggest problem with MW is interference from hologen lamps, Generally, there is no interference from halogen lamps themselves, I have two in my radio room and there is no interfernce whatsoever from them. However (and you knew this was coming, right? grin) these have off-lo-hi switches. I have one in the living room which has a dimmer switch and it tears up anything that gets close. Some of this latter design will even interfere when they're turned off. dimmers, etc. I don't know if there is any NB that will eliminate this type of interference. What I would like to see is: A portable with a large enough quality speaker to get a decent bass response, separate tone controls (or even better, a graphic equalizer Over the years, I've used from one tone control to nine and the simplest that worked well was three controls, the standard trebel and bass and a "midrange" that covered (typically) from 300 to 3000cps/Hertz. tailored to reduce certains frequencies associated with different types of interference), at LEAST two GOOD bandwidths, a superior built-in directional antenna, and of course a selectable sideband option would certainly be nice. If your set is a real step up from what I currently have, I will definitely be a buyer! Gray |
#7
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![]() "Pete KE9OA" schreef in bericht ..net... My employer has given me the go ahead to design a new product. If there is enough interest, I will design a new MW receiver for the market. What would you be more interested in......................a small table top type, or a portable? Performance wise, I am talking about something like that of an AOR7030. I don't think that I would be inplementing Sync Detection, Synch detection is a MUST for a high quality AM radio. but a couple of I.F. bandwidths could be possible. Definitely, double conversion, and digital readout, Single conversion with a good preselector is O.K Up conversion may also be considered with good audio quality. For mediumwave reception LOWE's HF150 should be your guide in performance, (Not in ergonomics). The synch detector is very high quality Would you want any presets? How about target price? Do you want a built in antenna, or external antenna only? High and low impedance antenna inputs? How about a built in tunable preselector? E-mail me directly, and we will see what happens. This is usenet, more people are interested in the discussion. Any of you who have built any of me receivers know what I am talking about...............I plan to take the design to the next couple of steps up in performance. |
#8
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![]() I think the idea of a high performance MW radio is a great idea! There is definately a good market for it. The main competitor I would imagine would be the CC Radio, so your end price would have to be comparative to that. I am a MW DXer, so I hope I can give you some helpful advice and encouragement. No matter how the radio takes shape, it probably goes without saying that it should be able to be powered by both AC and DC. If you can only pick one, go with DC. First, I offer three suggestions if you must keep it cheap. 1. Analog tuning. However please keep the dial accurate and as even and as spread as possible, with a marking for each kHz. This will enable the listener to know if he is tuned to 832 kHz or 837 kHz for example. The needle which shows the listener where he is tuned should be narrow yet brightly colored. Many current radios suffer from squashing the high end frequencies together... this should be avoided. In fact, I'm sure many MW DXers would agree with me that although they might prefer digital tuning, if you could produce a radio with a very accurate and evenly spread analog dial, they would gladly accept the trade-off. No matter what you do, please keep the noise floor as low as humanly possible in this radio (another reason to go analog). 2. Make sure the radio's own antenna can swivel independently from the radio itself. Some old radios have this helpful feature. It allows you to keep the radio pointed right at you so you can read the dial, and just swivel the antenna. Make the antenna as big and as sensitive as possible, whether it be a loop or a stick. Also, please allow for the ability to switch off this antenna so that an external antenna could be added by the listener. Would it be possible to incorporate some sort of phasing relationship between the external antenna and the radio's antenna without adding much cost? If so, that could be a third switch position on the radio's antenna controls. 3. Use high quality filters with 3 different positions... wide, narrow, and super narrow. If only two are feasible, I would strongly recommend narrow and super narrow.... not many listen to music for enjoyment on MW radio these days, and since this radio is designed mainly for distance listening I'm sure a wide position wouldn't be missed. If you can add a few more expensive features, I'll rank them in importance. 1. Sync detector. The sync detector on my Sony 2010 really helps me dig out stations that my other non-sync radios cannot. How much per unit would a sync detector cost? 2. If this radio does take a digital form, a dozen presets would be nice. If at all possible, it would be great to have a memory scan feature where these 12 stations could be scanned repeatedly, with the radio pausing 10 seconds on each frequency before moving on to the next. The listener could program in 12 MW stations they use as benchmarks for DX conditions, and then let the radio scan through them automatically. That's it for me... I really think this is a great project and wish you all the luck in the world. I would be glad to publiicize too on the various MW groups and lists on the net as well once it is produced. |
#9
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In article , Matt wrote:
1. Sync detector. The sync detector on my Sony 2010 really helps me dig out stations that my other non-sync radios cannot. How much per unit would a sync detector cost? The sync detector on the 2010 was born because Sony had tons of AM stereo demultiplexor chips and nothing to do with them. By the time the 2010 came out AM stereo was dead. Anyone out there with a AM stereo receiver? (mine was stolen in 1989). A brilliant engineer figured out that with a slight circuit modification, he could add a sync detector (unheard of on a consumer radio) and get rid of those chips. With the demise of the SW77, I doubt those chips are still available. Now, to throw my own two cents in. :-) I'd like to see the unit "EMP hardened" to the point that a nearby lightening strike would not damage it. I live 3,000 feet up in the desert and we get some very strong lightening storms. Geoff. -- Geoffrey S. Mendelson 972-54-608-069 Icq/AIM Uin: 2661079 MSN IM: (Not for email) Carp are bottom feeders, koi are too, and not surprisingly are ferrets. |
#10
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![]() "Geoffrey S. Mendelson" wrote in message ... The sync detector on the 2010 was born because Sony had tons of AM stereo demultiplexor chips and nothing to do with them. By the time the 2010 came out AM stereo was dead. It's true that AM stereo isn't the big deal that it's promoters claimed it was, but it's hardly dead. It certainly wasn't when the 2010 was introduced. By the mid 80's, I'd say the AM stereo receiver market was still growing. AM stereo was approved in 82. There's three AM stereo stations here. Anyone out there with a AM stereo receiver? (mine was stolen in 1989). Two. One's the car radio. [snip] Geoff. Frank Dresser |
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