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#2
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Len Over 21 wrote:
In article , (Brian the Bluffman's Home Companion Kelly) writes: (Len Over 21) wrote in message ... In article , (always write even when wrong) writes: In article , (Brian Kelly) writes: Whatever you say. You can imagine getting within 10 Hz of the correct frequency with the '50s designs all you want...but that won't make it happen. What?? Where, exactly, has anybody claimed 10Hz frequency resolution with '50s analog radios? As you will say later, those "analog" radios have INFINITE resolution. :-) Creative PLL and DDS subsystems of today, designed by others, make it possible for anyone to select 10 Hz increments on any HF band (30,000 frequencies within 300 KHz) with crystal- controlled accuracy. Analog VFOs are continuously variable. Making it possible for anyone to select an *infinite* number of "increments" within a 300Hz bandwidth much less your coarse 300 Khz wide example. Heh heh heh...your bafflegab won't win blind man's bluff, Kellie, deal yourself a better hand... :-) Feel free to try to state you can return to that "infinite possible" setting within a few PPM...all without any old crystal calibrator and dependent on that "coarse" analog dial. :-) And they do it without generating any phase noise or other forms of crud synthesizers toss out. Kellie, define "phase noise" insofar as amateur radio operation is concerned. You, for the limits of your technical knowledge, should call that "incidental FM" which is what the industry term "phase noise" refers. :-) Then you should examine exactly how low that terrible phase noise is. You can use the term "dbc" referring to the number of decibels below the "carrier" (center frequency reference, not a modulated carrier per se). The "crud" (as you term it) is quite far down in relative power and certainly won't affect morse code reception of an on-off keyed station's carrier. "Phase noise" is a somewhat new buzzword in industry due to the importance of keeping it low for QAM signals (Quadrature [phase] Amplitude Modulation, a combination of PM and AM). The cell phone engineers will know of that importance on keeping the BER (Bit Error Rate) as low as possible. The amount of work in the last decade on cellular telephony techniques has been enormous worldwide. It's only natural that industry advertisements, from sub- system components to full systems, emphasize a low "phase noise." As far as on-off keyed radiotelegraphy, your mention of "phase noise" as being "crud" in synthesizer frequency control is akin to making a big case for gold-plated music system speaker wires. :-) Once again, you've demonstrated that you know very little about problems with much of the amateur radio equipment produced within the past couple of decades. Noticeable phase noise appears not only in the receiver output section of many transceivers but in the transmitted signals as well. 1980's top of the line Kenwood TS-930's were rife with the phase noise products and synthesizer spurs. A quick spin of the main tuning dial with no antenna connected would result in a rapid p-t-t-t-t-t-t-t-t sound from such spurs. R.L. Drake's TR-7 had much less phase noise. Rigs such as Ten-Tec's Omni VI series, using a crystal mixed front end had almost no measureable phase noise. The folks in Newington whom you frequently enjoy insulting might put you on the road to being informed: http://www.arrl.org/files/infoserv/tech/bestrig.txt under "Q. What do you mean by receiver 'cleanliness'"? You may continue your education by looking at the following pdf file under section 1.2.2: http://www.qth.com/inrad/managing-interference-ch1.pdf One of the Polish fellows has published some excellent information. The phase noise issue is touched upon in the last few paragraphs: http://www.gmdx.org.uk/dxtest/qx9racze.pdf I rather prefer what I've been exposed to since 1963 on frequency control methods...beginning with those "cruddy" synthesizers (without "real" frequencies, only the "synthetic" variety)...and quartz crystal oscillator accuracy and stability to the 10 PPB region. Perhaps it is time to update your database, Leonard. USING modern equipment is NOT involving development or anything else. Try not to run off at the mouth/keyboard so hastily. Try not to nit-pick like nits over minor phrases in postings so that you have an "excuse" to cuss and snarl at NCTAs. It makes you look like nursie's cousin. :-) NOT USING modern equipment but attempting to spout off like you have some knowledge of what is being discussed is making you look like N0IMD's antenna advisor. Dave K8MN |
#3
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Dave Heil wrote in message ...
Len Over 21 wrote: In article , (Brian Kelly) writes: (Len Over 21) wrote in message ... In article , PAMNO (N2EY) writes: In article , (Brian Kelly) writes: Whatever you say. You can imagine getting within 10 Hz of the correct frequency with the '50s designs all you want...but that won't make it happen. What?? Where, exactly, has anybody claimed 10Hz frequency resolution with '50s analog radios? As you will say later, those "analog" radios have INFINITE resolution. :-) Note the avoidance of answering the question ;-) Creative PLL and DDS subsystems of today, designed by others, make it possible for anyone to select 10 Hz increments on any HF band (30,000 frequencies within 300 KHz) with crystal- controlled accuracy. Analog VFOs are continuously variable. Making it possible for anyone to select an *infinite* number of "increments" within a 300Hz bandwidth much less your coarse 300 Khz wide example. Heh heh heh...your bafflegab won't win blind man's bluff, Kellie, deal yourself a better hand... :-) Note the avoidance of the facts. ;-) Feel free to try to state you can return to that "infinite possible" setting within a few PPM...all without any old crystal calibrator and dependent on that "coarse" analog dial. :-) Note that the importance of this feature is not explained ;-) And they do it without generating any phase noise or other forms of crud synthesizers toss out. Kellie, define "phase noise" insofar as amateur radio operation is concerned. You, for the limits of your technical knowledge, should call that "incidental FM" which is what the industry term "phase noise" refers. :-) Then you should examine exactly how low that terrible phase noise is. You can use the term "dbc" referring to the number of decibels below the "carrier" (center frequency reference, not a modulated carrier per se). The "crud" (as you term it) is quite far down in relative power and certainly won't affect morse code reception of an on-off keyed station's carrier. "Phase noise" is a somewhat new buzzword in industry due to the importance of keeping it low for QAM signals (Quadrature [phase] Amplitude Modulation, a combination of PM and AM). The cell phone engineers will know of that importance on keeping the BER (Bit Error Rate) as low as possible. The amount of work in the last decade on cellular telephony techniques has been enormous worldwide. It's only natural that industry advertisements, from sub- system components to full systems, emphasize a low "phase noise." As far as on-off keyed radiotelegraphy, your mention of "phase noise" as being "crud" in synthesizer frequency control is akin to making a big case for gold-plated music system speaker wires. :-) Once again, you've demonstrated that you know very little about problems with much of the amateur radio equipment produced within the past couple of decades. Noticeable phase noise appears not only in the receiver output section of many transceivers but in the transmitted signals as well. 1980's top of the line Kenwood TS-930's were rife with the phase noise products and synthesizer spurs. A quick spin of the main tuning dial with no antenna connected would result in a rapid p-t-t-t-t-t-t-t-t sound from such spurs. R.L. Drake's TR-7 had much less phase noise. Rigs such as Ten-Tec's Omni VI series, using a crystal mixed front end had almost no measureable phase noise. The main importance of phase noise in amateur HF reception is that it causes the apparent noise floor to rise when a strong signal or signals is close to the desired signal frequency. If you are trying to receive a -130 dBm signal and a strong signal a few kHz away mixing with a noisy synthesized LO causes your receiver's noise floor to rise to -120 dbm, you're out of luck. And the amateur HF bands are often full of strong local signals adjacent to the weak ones we want to work. The folks in Newington whom you frequently enjoy insulting might put you on the road to being informed: http://www.arrl.org/files/infoserv/tech/bestrig.txt under "Q. What do you mean by receiver 'cleanliness'"? You may continue your education by looking at the following pdf file under section 1.2.2: http://www.qth.com/inrad/managing-interference-ch1.pdf One of the Polish fellows has published some excellent information. The phase noise issue is touched upon in the last few paragraphs: http://www.gmdx.org.uk/dxtest/qx9racze.pdf All good stuff. Note how well a certain kit transceiver performs... I rather prefer what I've been exposed to since 1963 on frequency control methods... Stuck in the past. ;-) beginning with those "cruddy" synthesizers (without "real" frequencies, only the "synthetic" variety)...and quartz crystal oscillator accuracy and stability to the 10 PPB region. Perhaps it is time to update your database, Leonard. To at least 1980s levels ;-) USING modern equipment is NOT involving development or anything else. This gives us cause to wonder..... What amateur radio equipment has Len developed? What amateur radio equipment has Len actually used, and in what environments? (The contest environment is quite different from the "quiet band" environment) How many contest points/countries/states/contacts has Len made with amateur radio equipment he developed/designed/built/paid for himself? What articles on amateur radio receiver performance issues such as dynamic range (third order IMD, BDR, etc.), phase noise, etc., has he authored? Or even actually read and understood? The world wonders....;-) Try not to run off at the mouth/keyboard so hastily. Try taking your own advice ;-) Try not to nit-pick like nits over minor phrases in postings so that you have an "excuse" to cuss and snarl at NCTAs. What minor phrases? Len claimed that frequency synthesizer rigs were necessary for the "subdivisions" of 1968. Numerous positngs by different authors, all of whom actually had to deal with those "subdivisions" have proved that to be utterly false and without basis. Len, of course, never had to deal with them at all because he's never been a radio amateur and never operated an amateur radio station. (By FCC definition, operating requires a license). It makes you look like nursie's cousin. :-) NOT USING modern equipment but attempting to spout off like you have some knowledge of what is being discussed is making you look like N0IMD's antenna advisor. Not using, not owning, not building, not developing...... Of course, to the knowledgeable reader, Len's postings simply reveal how truly ignorant he is of amateur radio in many ways. That's not a crime, of course, but it does get boring. His posts also reveal how resistant is he is to new ideas and information, when presented to him from certain sources he deems inferior. 73 de Jim, N2EY |
#4
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In article ,
(N2EY) writes: Dave Heil wrote in message ... Tsk, Jimmie be posting to me, yet doesn't get who he be making a reply to... :-) [see later] Note the avoidance of answering the question ;-) Note the avoidance of the facts. ;-) Note that the importance of this feature is not explained ;-) Stuck in the past. ;-) Tsk. Jimmie looking in mirror again when writing, reflecting his own "renowned historian" claim and musing on stacks and stacks of old periodicals. This gives us cause to wonder..... What amateur radio equipment has Len developed? What amateur radio equipment has Len actually used, and in what environments? (The contest environment is quite different from the "quiet band" environment) How many contest points/countries/states/contacts has Len made with amateur radio equipment he developed/designed/built/paid for himself? What articles on amateur radio receiver performance issues such as dynamic range (third order IMD, BDR, etc.), phase noise, etc., has he authored? Or even actually read and understood? The world wonders....;-) "The world" isn't "wondering" at all. Neither Jimmie nor Davie have developed any marketable ham transceivers. [if they did, they should fire their marketing consultants for creating invisibility of product] Try not to run off at the mouth/keyboard so hastily. Try taking your own advice ;-) Always do. Try not to nit-pick like nits over minor phrases in postings so that you have an "excuse" to cuss and snarl at NCTAs. What minor phrases? Len claimed that frequency synthesizer rigs were necessary for the "subdivisions" of 1968. Tsk. I didn't refer to 1968 per se. Numerous positngs by different authors, all of whom actually had to deal with those "subdivisions" have proved that to be utterly false and without basis. "Authors?" Who in here, besides myself, can claim many bylines and a staff position at a ham magazine? Not Jimmie. Not Davie. Len, of course, never had to deal with them at all because he's never been a radio amateur and never operated an amateur radio station. (By FCC definition, operating requires a license). Pity that. All that while as a professional and never becoming a licensed amateur! Horrors! Of course, to the knowledgeable reader, Len's postings simply reveal how truly ignorant he is of amateur radio in many ways. That's not a crime, of course, but it does get boring. Poor baby. Bored are you? Tsk, tsk. Jimmie needs a hobby activity or to get out and see more things. Jimmie ought to understand that radio amateurs didn't invent radio nor did they develop all the circuits and systems in modern ready- built radios. Tsk. His posts also reveal how resistant is he is to new ideas and information, when presented to him from certain sources he deems inferior. Tsk. Still on that inferiority complex are you? Don't worry. You keep shouting and denigrating your inferiors and all will respect you in the morning. :-) |
#5
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Avery Fineman wrote:
In article , (N2EY) writes: Dave Heil wrote in message ... What amateur radio equipment has Len developed? What amateur radio equipment has Len actually used, and in what environments? (The contest environment is quite different from the "quiet band" environment) How many contest points/countries/states/contacts has Len made with amateur radio equipment he developed/designed/built/paid for himself? What articles on amateur radio receiver performance issues such as dynamic range (third order IMD, BDR, etc.), phase noise, etc., has he authored? Or even actually read and understood? The world wonders....;-) "The world" isn't "wondering" at all. Neither Jimmie nor Davie have developed any marketable ham transceivers. No, I've developed the same number of marketable ham transceivers you have, Leonard--none. Then again, I was aware of the synthesizer phase noise and spurs. You weren't. You attempted to spoon feed us crap. What minor phrases? Len claimed that frequency synthesizer rigs were necessary for the "subdivisions" of 1968. Tsk. I didn't refer to 1968 per se. Weren't you the guy who wrote something of nit-picking? When did you think those subbands came into existence? Numerous positngs by different authors, all of whom actually had to deal with those "subdivisions" have proved that to be utterly false and without basis. "Authors?" Who in here, besides myself, can claim many bylines and a staff position at a ham magazine? Not Jimmie. Not Davie. Authors. You know, who writes something. I've had a number of bylines in amateur radio magazines. Be careful, you'll end up looking like Brian Burke in his A-1 Op Club gaffe. Len, of course, never had to deal with them at all because he's never been a radio amateur and never operated an amateur radio station. (By FCC definition, operating requires a license). Pity that. All that while as a professional and never becoming a licensed amateur! Horrors! Do us a favor and note that this newsgroup is rec.radio.amateur.policy. I'm not impressed with your frequent touting of your past professional status. Many radio amateurs are current or past professionals in communications or electronics. Tooting your horn about your past work and attempting to use it as a substitute for an amateur license in an amateur radio newsgroup isn't likely to win you any points among hams. Of course, to the knowledgeable reader, Len's postings simply reveal how truly ignorant he is of amateur radio in many ways. That's not a crime, of course, but it does get boring. Poor baby. Bored are you? Tsk, tsk. Jimmie needs a hobby activity or to get out and see more things. Oh! Didn't you know? Jim's a licensed amateur radio operator. Maybe you could take up amateur radio. Jimmie ought to understand that radio amateurs didn't invent radio nor did they develop all the circuits and systems in modern ready- built radios. Tsk. I'm guessing that Jim and everyone else here was already aware of that factoid. Jim likely realizes that you didn't invent radio or all of the circuits and systems in modern ready-built radios. That makes you even. Dave K8MN |
#6
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In article , Dave Heil
writes: No, I've developed the same number of marketable ham transceivers you have, Leonard--none. Then again, I was aware of the synthesizer phase noise and spurs. You weren't. You attempted to spoon feed us crap. I "wasn't aware?" :-) Wow, Marconi Jr., you best run to GE and have them cancel out a bunch of RCA archives with my name on it. They were very much concerned with spurious output (noise is a spurious output). Real technical papers, published and all that after being checked by staff folks. What "crap" did you get in your feeding spoon tonight? Did it give you terrible heartburn to having an NCTA demonstrate some inside knowledge of frequency control? I'll bet it did. There's all kinds of antacids on the shelf. Avail yourself of them. Weren't you the guy who wrote something of nit-picking? When did you think those subbands came into existence? The first ones were in 1934...birth of the FCC. :-) Authors. You know, who writes something. I've had a number of bylines in amateur radio magazines. Wow. Yeah! Ham Radio Horizons...aimed for the beginner in radio. Go for it! Famous Author Davie! You ought to publish a book. Be careful, you'll end up looking like Brian Burke in his A-1 Op Club gaffe. ...or any other NCTA you want to destroy. :-) Do us a favor and note that this newsgroup is rec.radio.amateur.policy. I'm not impressed with your frequent touting of your past professional status. Awww. We don't impress you? How sad. Many radio amateurs are current or past professionals in communications or electronics. So? You demand "showing papers" at train stations too? That black leather overcoat is in style, I suppose. The jack boots aren't... Tooting your horn about your past work and attempting to use it as a substitute for an amateur license in an amateur radio newsgroup isn't likely to win you any points among hams. Tsk. This is a "points count?" Poor Davie...still stuck on enforced licensing just to advocate some freeding into getting into licensing. Tsk. Who says the PCTA abrogate the First Amendment? Nearly all... Oh! Didn't you know? Jim's a licensed amateur radio operator. Maybe you could take up amateur radio. Toss out the code test and I'll think about it. Maybe you could take up "civil discourse," Davie? Then you wouldn't look like second cousin to nursie yell-yell. I'm guessing that Jim and everyone else here was already aware of that factoid. Jim likely realizes that you didn't invent radio or all of the circuits and systems in modern ready-built radios. That makes you even. No problem. You sure as hell didn't invent much. :-) Didn't St. Hiram invent radio? And then form a religious order around it? :-) Why did you grab all the A-1 sauce? :-) |
#7
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In article , Dave Heil
writes: Avery Fineman (in a desperate attempt to get through spam filters) wrote: In article , (N2EY) writes: Dave Heil wrote in message ... What amateur radio equipment has Len developed? Answer: None that he will admit to. What amateur radio equipment has Len actually used, and in what environments? (The contest environment is quite different from the "quiet band" environment) Answer: None that he will admit to. How many contest points/countries/states/contacts has Len made with amateur radio equipment he developed/designed/built/paid for himself? Answer: None What articles on amateur radio receiver performance issues such as dynamic range (third order IMD, BDR, etc.), phase noise, etc., has he authored? Or even actually read and understood? Answer: None The world wonders....;-) "The world" isn't "wondering" at all. Yes it is! ;-) Neither Jimmie nor Davie have developed any marketable ham transceivers. Who are "Jimmie and Davie"? Perhaps Len meant "Jim, N2EY" and "Dave, K8MN". If so, then his use of feminized diminutives for our names proves (paraphrasing Brian, N0IMD): "he doesn't have the guts to spell our names right". I have designed, built, and operated at three amateur radio HF transceivers. First one was about 25 years ago. Before that, I was doing the same with separate receivers and transmitters. No, I've developed the same number of marketable ham transceivers you have, Leonard--none. Why is it at all important that something be "marketable"? One of the joys of home construction is *not* having to meet someone else's idea of "what the market wants". Then again, I was aware of the synthesizer phase noise and spurs. You weren't. You attempted to spoon feed us crap. What minor phrases? Len claimed that frequency synthesizer rigs were necessary for the "subdivisions" of 1968. Tsk. I didn't refer to 1968 per se. Weren't you the guy who wrote something of nit-picking? When did you think those subbands came into existence? Subbands-by-license-class came into existence in US ham radio in 1951, with the creation of the Novice. Len wasn't a ham then. The current system of General/Advanced/Extra subbands-by-license-class came into existence in US ham radio in 1968, after several years of discussion. Len wasn't a ham then. I was, K8MN was. Len wrote here in January 2000 that he was going for Extra right out of the box. He wasn't a ham then. Nor now. Numerous positngs by different authors, all of whom actually had to deal with those "subdivisions" have proved that to be utterly false and without basis. "Authors?" Who in here, besides myself, can claim many bylines and a staff position at a ham magazine? Living in the past.... Did Len have a nice office at the magazine? Did he like living in New Hampshire? Whatever became of that magazine? - I can't find it on the newsstands... I do have quite a few old copies of it, but Len's name isn;t in any of them. Not Jimmie. Not Davie. Doesn't have the guts to spell... Authors. You know, who writes something. I've had a number of bylines in amateur radio magazines. Be careful, you'll end up looking like Brian Burke in his A-1 Op Club gaffe. I've had articles published in amateur magazines. A lot more recently than Len, too ;-) But as you say, Dave, an author is someone who writes. I am the author of this post; therefore, I am an author. So are you. The point is the same: Numerous authors here have proved Len's assertions about subbands and synthesizers to be completely without basis in fact. Len, of course, never had to deal with them at all because he's never been a radio amateur and never operated an amateur radio station. (By FCC definition, operating requires a license). Pity that. All that while as a professional and never becoming a licensed amateur! Horrors! "Not that there's anyhting wrong with that" Do us a favor and note that this newsgroup is rec.radio.amateur.policy. I'm not impressed with your frequent touting of your past professional status. Many radio amateurs are current or past professionals in communications or electronics. Tooting your horn about your past work and attempting to use it as a substitute for an amateur license in an amateur radio newsgroup isn't likely to win you any points among hams. The plain simple fact remains that Len has not had to deal with subbands-by-license-class in amateur radio. Or any other amateur-radio issues. His observations are those of a spectator only, not a participant. Of course, to the knowledgeable reader, Len's postings simply reveal how truly ignorant he is of amateur radio in many ways. That's not a crime, of course, but it does get boring. Poor baby. Bored are you? Tsk, tsk. Jimmie needs a hobby activity or to get out and see more things. Oh! Didn't you know? Jim's a licensed amateur radio operator. Maybe you could take up amateur radio. I have several non-work activities and responsibilites and I get out quite a bit. Jimmie ought to understand that radio amateurs didn't invent radio nor did they develop all the circuits and systems in modern ready- built radios. Tsk. I'm guessing that Jim and everyone else here was already aware of that factoid. I realized that long ago. Jim likely realizes that you didn't invent radio or all of the circuits and systems in modern ready-built radios. That makes you even. Actually, I don't think Len invented *any* of the circuits or systems now used in "modern ready-built radios". Not any radios I know of, anyway. "Not that there's anything wrong with that" 73 de Jim, N2EY |
#8
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In article , Dave Heil
writes: USING modern equipment is NOT involving development or anything else. Try not to run off at the mouth/keyboard so hastily. Try not to nit-pick like nits over minor phrases in postings so that you have an "excuse" to cuss and snarl at NCTAs. It makes you look like nursie's cousin. :-) NOT USING modern equipment but attempting to spout off like you have some knowledge of what is being discussed is making you look like N0IMD's antenna advisor. That would be Kellie...whose only "engineering expertise" seems involved with antenna support structures. Kellie not know much of the innards of frequency control subsystems in a modern radio so he tries to misdirect onto his mechanical thing. Do I have knowledge of modern frequency control subsystems of radios? Yes, considerable. Such applies to all radios, not what a designer-maker has labeled "amateur" as (as you imply) being somehow different than other radios. No amateur radio license is required to acquire knowledge of radio-electronics technology. No amateur radio license will let you legally radiate RF outside of amateur bands (beyond the incidental/low-power government limits). In most U.S. radio services no federal license is required to use those radios. |
#9
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Len Over 21 wrote:
In article , Dave Heil writes: USING modern equipment is NOT involving development or anything else. Try not to run off at the mouth/keyboard so hastily. Try not to nit-pick like nits over minor phrases in postings so that you have an "excuse" to cuss and snarl at NCTAs. It makes you look like nursie's cousin. :-) NOT USING modern equipment but attempting to spout off like you have some knowledge of what is being discussed is making you look like N0IMD's antenna advisor. That would be Kellie...whose only "engineering expertise" seems involved with antenna support structures. Leonard, you can't seem to get anything right of late. Kelly's advice was totally rejected by your little electrolyte, "William". Brian posed you a question which had nothing whatever to do with "antenna support structures". Did you come up with the answer yet? Kellie not know much of the innards of frequency control subsystems in a modern radio so he tries to misdirect onto his mechanical thing. He certainly knows more about them than you as evidenced by your comments on phase noise compared to his. Do I have knowledge of modern frequency control subsystems of radios? Yes, considerable. That hasn't been evident in light of your comments on the importance of low synthesizer phase noise. Such applies to all radios, not what a designer-maker has labeled "amateur" as (as you imply) being somehow different than other radios. Amateur transceivers are, for the most part, quite different than transceivers designed for point-to-point use. Some rigs--Ten-Tec's Omni V, Omni VI and the main receiver of the Orion are amateur band only transceivers. No amateur radio license is required to acquire knowledge of radio-electronics technology. Lucky for you! No amateur radio license will let you legally radiate RF outside of amateur bands (beyond the incidental/low-power government limits). And? In most U.S. radio services no federal license is required to use those radios. Sounds like a plan for you. Grab a job in one of those services and operate like crazy. You didn't seem to have any comments at all about your comments on phase noise as compared to reality. My comments to you we "Once again, you've demonstrated that you know very little about problems with much of the amateur radio equipment produced within the past couple of decades. Noticeable phase noise appears not only in the receiver output section of many transceivers but in the transmitted signals as well. 1980's top of the line Kenwood TS-930's were rife with the phase noise products and synthesizer spurs. A quick spin of the main tuning dial with no antenna connected would result in a rapid p-t-t-t-t-t-t-t-t sound from such spurs. R.L. Drake's TR-7 had much less phase noise. Rigs such as Ten-Tec's Omni VI series, using a crystal mixed front end had almost no measureable phase noise." "The folks in Newington whom you frequently enjoy insulting might put you on the road to being informed: http://www.arrl.org/files/infoserv/tech/bestrig.txt under 'Q. What do you mean by receiver cleanliness'? You may continue your education by looking at the following pdf file under section 1.2.2: http://www.qth.com/inrad/managing-interference-ch1.pdf One of the Polish fellows has published some excellent information. The phase noise issue is touched upon in the last few paragraphs: http://www.gmdx.org.uk/dxtest/qx9racze.pdf " Dave K8MN |
#10
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![]() Creative PLL and DDS subsystems of today, designed by others, make it possible for anyone to select 10 Hz increments on any HF band (30,000 frequencies within 300 KHz) with crystal- controlled accuracy. Analog VFOs are continuously variable. Making it possible for anyone to select an *infinite* number of "increments" within a 300Hz bandwidth much less your coarse 300 Khz wide example. Sure, but those old VFOs tended to change the frequency a little over time. AKA "drift". Me thinks one desires to select a frequency and then have the rig stay put on it. Modern rigs can do that to the accuracy and drift of a good crystal oscillator to some set resolution. But for our uses, 10Hz resolution is more than sufficient. And they do it without generating any phase noise or other forms of crud synthesizers toss out. Kellie, define "phase noise" insofar as amateur radio operation is concerned. You, for the limits of your technical knowledge, should call that "incidental FM" which is what the industry term "phase noise" refers. :-) Then you should examine exactly how low that terrible phase noise is. You can use the term "dbc" referring to the number of decibels below the "carrier" (center frequency reference, not a modulated carrier per se). The "crud" (as you term it) is quite far down in relative power and certainly won't affect morse code reception of an on-off keyed station's carrier. Early 2 meter synthesized rigs had some trouble with this (the phase noise would "add" to the FM modulation and produce extra noise. Phase modulation and frequency modulation are closely related, one is the integral (as in calculus) of the other. As for HF CW, some poorly designed novice xtal oscillator circuits probably had it worse than a modern synthesized rig. And then there's chirp... |
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