|
.... to think it possible!
Now all the CB'ers are doomed to failure! Surely the concept and workings of a phase locked loop are beyond their comprehension! evil-protectionist-chuckle Heee-he-he-he-he! John "Caveat Lector" wrote in message news:Sw7Ge.22116$HV1.13942@fed1read07... A PLL question is on the extra exam See question E7D07 -- CL -- I doubt, therefore I might be ! "John Smith" wrote in message ... How about PLL? John "Caveat Lector" wrote in message news:nH6Ge.22103$HV1.10801@fed1read07... Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? Then why ask these questions on a 2005 Ham test ?? Maybe ask about a VCO or a crowbar circuit ?? -- CL -- I doubt, therefore I might be ! Someone wrote Draw a Colpitts Oscillator What is a swinging choke |
CL:
If you run into any cb'ers having a problem with that question, it is included on this URL, containing the questions, and the CORRECT answers: http://www.craigr.com/subelement7.htm John "Caveat Lector" wrote in message news:Sw7Ge.22116$HV1.13942@fed1read07... A PLL question is on the extra exam See question E7D07 -- CL -- I doubt, therefore I might be ! "John Smith" wrote in message ... How about PLL? John "Caveat Lector" wrote in message news:nH6Ge.22103$HV1.10801@fed1read07... Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? Then why ask these questions on a 2005 Ham test ?? Maybe ask about a VCO or a crowbar circuit ?? -- CL -- I doubt, therefore I might be ! Someone wrote Draw a Colpitts Oscillator What is a swinging choke |
Caveat Lector wrote:
A PLL question is on the extra exam See question E7D07 How about "Twiddle factor"? -- 73, Cecil, http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
In article nH6Ge.22103$HV1.10801@fed1read07,
Caveat Lector wrote: Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? I believe that a goodly percentage of fixed-frequency quartz crystal oscillators use a Colpitts configuration in their feedback circuitry. Pierce topologies are likely used, as well. The L in such oscillators is the motional inductance of the crystal, rather than the inductance of a wire-wound inductor, but the principle is still the same. Then why ask these questions on a 2005 Ham test ?? Because the circuits are still relevant, to either modern ham gear, or to the older gear that many hams refurbish and use, or to both. Maybe ask about a VCO or a crowbar circuit ?? VCOs require some form of positive feedback in order to oscillate. This can be in a Colpitts configuration just as well as in any other. Questions about a crowbar would certainly be relevant as well. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
Dave:
I have seen designs used which use a "white noise generator" at their osc. Simply filter the freq you want from it and off you go... John "Dave Platt" wrote in message ... In article nH6Ge.22103$HV1.10801@fed1read07, Caveat Lector wrote: Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? I believe that a goodly percentage of fixed-frequency quartz crystal oscillators use a Colpitts configuration in their feedback circuitry. Pierce topologies are likely used, as well. The L in such oscillators is the motional inductance of the crystal, rather than the inductance of a wire-wound inductor, but the principle is still the same. Then why ask these questions on a 2005 Ham test ?? Because the circuits are still relevant, to either modern ham gear, or to the older gear that many hams refurbish and use, or to both. Maybe ask about a VCO or a crowbar circuit ?? VCOs require some form of positive feedback in order to oscillate. This can be in a Colpitts configuration just as well as in any other. Questions about a crowbar would certainly be relevant as well. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
Caveat Lector wrote:
Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? Then why ask these questions on a 2005 Ham test ?? Maybe ask about a VCO or a crowbar circuit ?? -- CL -- I doubt, therefore I might be ! Someone wrote Draw a Colpitts Oscillator What is a swinging choke The Ameritron ALS-600 solid state amplifier uses a swinging choke in its 50 volt 20 amp power supply. The choke is essentially the regulating element because it swings in and out of core saturation. I understand they now have a SMPS that they will offer with the ALS-600. Maybe they should have some questions about SMPS on the exam. Gary N4AST |
Caveat Lector wrote:
Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? Then why ask these questions on a 2005 Ham test ?? Maybe ask about a VCO or a crowbar circuit ?? You miss the point! Totally missed the point!! In the 'olden days', the exams were not multiple guess questions; and, they were answered in front of an FCC Engineer. In the olden days one had to commit to some real effort to get a license. In human nature we VALUE that which we work for or invest for. The crime in ham radio today is the 5 hour Saturday morning cram session followed by a VE session; followed by a license; followed by loss of interest in a year or so. I live in a small town with 14 licensed 'hams' with only one active [me] and only one HF station [mine]. IMO there is a significant difference between number of licenses issued or valid and how many hams are on the air. |
.... in the "olden days" it was expected you would be building that equipment
you were being tested on ... .... of course logic and reason now demands the removal of those questions ... John "Ham op" wrote in message ... Caveat Lector wrote: Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? Then why ask these questions on a 2005 Ham test ?? Maybe ask about a VCO or a crowbar circuit ?? You miss the point! Totally missed the point!! In the 'olden days', the exams were not multiple guess questions; and, they were answered in front of an FCC Engineer. In the olden days one had to commit to some real effort to get a license. In human nature we VALUE that which we work for or invest for. The crime in ham radio today is the 5 hour Saturday morning cram session followed by a VE session; followed by a license; followed by loss of interest in a year or so. I live in a small town with 14 licensed 'hams' with only one active [me] and only one HF station [mine]. IMO there is a significant difference between number of licenses issued or valid and how many hams are on the air. |
Caveat Lector wrote:
Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? Then why ask these questions on a 2005 Ham test ?? Maybe ask about a VCO or a crowbar circuit ?? All of them!!! The reference oscillator in every phase locked loop is generally a Colpitt's oscillator. I suspect that every oscillator in the VCO circuit is also Colpitt's. By simply asking the question you make the point!!! The required level of knowledge for a license today is significantly poorer than 40 or 50 years ago. |
White noise is a critical requirement of the Colpitts/Hartley oscillator
design. Nothing new here! You say you don't know why White noise is required. Better go read Terman or other credible designers. John Smith wrote: Dave: I have seen designs used which use a "white noise generator" at their osc. Simply filter the freq you want from it and off you go... John "Dave Platt" wrote in message ... In article nH6Ge.22103$HV1.10801@fed1read07, Caveat Lector wrote: Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? I believe that a goodly percentage of fixed-frequency quartz crystal oscillators use a Colpitts configuration in their feedback circuitry. Pierce topologies are likely used, as well. The L in such oscillators is the motional inductance of the crystal, rather than the inductance of a wire-wound inductor, but the principle is still the same. Then why ask these questions on a 2005 Ham test ?? Because the circuits are still relevant, to either modern ham gear, or to the older gear that many hams refurbish and use, or to both. Maybe ask about a VCO or a crowbar circuit ?? VCOs require some form of positive feedback in order to oscillate. This can be in a Colpitts configuration just as well as in any other. Questions about a crowbar would certainly be relevant as well. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
Hmmm...
No, I don't believe I will have to read anything... But, if you can't tell the difference between a white noise generator and an osc giving a clean fundamental signal with greatly suppressed/filtered harmonics (or even, non-existent harmonics), you may wish to read-up before taking that project to the air... John "Ham op" wrote in message ... White noise is a critical requirement of the Colpitts/Hartley oscillator design. Nothing new here! You say you don't know why White noise is required. Better go read Terman or other credible designers. John Smith wrote: Dave: I have seen designs used which use a "white noise generator" at their osc. Simply filter the freq you want from it and off you go... John "Dave Platt" wrote in message ... In article nH6Ge.22103$HV1.10801@fed1read07, Caveat Lector wrote: Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? I believe that a goodly percentage of fixed-frequency quartz crystal oscillators use a Colpitts configuration in their feedback circuitry. Pierce topologies are likely used, as well. The L in such oscillators is the motional inductance of the crystal, rather than the inductance of a wire-wound inductor, but the principle is still the same. Then why ask these questions on a 2005 Ham test ?? Because the circuits are still relevant, to either modern ham gear, or to the older gear that many hams refurbish and use, or to both. Maybe ask about a VCO or a crowbar circuit ?? VCOs require some form of positive feedback in order to oscillate. This can be in a Colpitts configuration just as well as in any other. Questions about a crowbar would certainly be relevant as well. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
.... not at all...
.... some are cmos/mosfet nand/nor gates, xtal controlled feedback--used as osc's and only tuned by "pulling" the xtal with a cap, and the signal passed to multipliers (multishot monostable vibrators) or freq dividers (dec/hex/oct) and used with other signals (mixed) to produce still other/unique freqs. Special purpose ic's are around which contain all this (except the xtal) on a single chip. There is probably much newer technology than this at this point, as all my knowledge of this hardware is a decade or more old... The cheapest/easiest equip uses a coil and cap (old vfo's) and/or xtal (vxo's.) John "Ham op" wrote in message ... Caveat Lector wrote: Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? Then why ask these questions on a 2005 Ham test ?? Maybe ask about a VCO or a crowbar circuit ?? All of them!!! The reference oscillator in every phase locked loop is generally a Colpitt's oscillator. I suspect that every oscillator in the VCO circuit is also Colpitt's. By simply asking the question you make the point!!! The required level of knowledge for a license today is significantly poorer than 40 or 50 years ago. |
The same day I took the test for General, I also took and passed all
requirements for a first class Phone with RADAR endorsement. The engineer administering the test told me if I wanted to take a really tough test, the amateur extra was the most difficult given by the FCC. Unfortunately at that time one had to wait a year to take advanced and two years to take the Extra. I would sure like to see them reinstate the time requirements so some of these young bucks could get a little seasoning before advancing. Today you can get it all in one day. Then armed with your brand new Extra; proceed to E-Ham and ask questions in the Elmer conference that could be answered by an old time novice. "Ham op" wrote in message ... The required level of knowledge for a license today is significantly poorer than 40 or 50 years ago. |
Fred:
Yes. But those were simple times when much of what we take for granted today loomed before us as dark mysteries... Things are much more complex these days, BS, MS, PHD's are much more common per capita and the general knowledge of the common person on the street is magnitudes greater than the times you are speaking of. No longer are people with a bit of knowledge in such demand. Our colleges turn out highly educated individuals in vast numbers which stagger the imagination. Indeed, seats in colleges are filled far too quickly, leaving no room for those not fortunate to gain entrance. It is quite possible the person you see before you in a lowly public service position has a degree. Across the board, +25% of all college grads are working at or near minimum wage in a field outside their course of study--five years after they graduate; I suspect this figure, which the colleges themselves claim, is rather low... John "Fred W4JLE" wrote in message ... The same day I took the test for General, I also took and passed all requirements for a first class Phone with RADAR endorsement. The engineer administering the test told me if I wanted to take a really tough test, the amateur extra was the most difficult given by the FCC. Unfortunately at that time one had to wait a year to take advanced and two years to take the Extra. I would sure like to see them reinstate the time requirements so some of these young bucks could get a little seasoning before advancing. Today you can get it all in one day. Then armed with your brand new Extra; proceed to E-Ham and ask questions in the Elmer conference that could be answered by an old time novice. "Ham op" wrote in message ... The required level of knowledge for a license today is significantly poorer than 40 or 50 years ago. |
John, I'm very serious when I say that 'white noise' is critical to
Colpitts/Hartley oscillator operation. The feedback equation for oscillation requires a voltagecurrent gain greater than 1 and a phase shift of 180 degrees [in simplified terms]. Starting conditions, in the absence of white noise, has zero input voltage and hence zero output voltage and therefore no oscillation! The presence of white noise provides the starting conditions, the Vin to be amplified, and the tuned circuit, L and C, provides the frequency discrimination, and the fundamental frequency of the oscillator. The Capacitive voltage divider [Colpitts] or the Inductive voltage divider [Hartley] provides the feedback factor. The active device, tube, transistor, FET, etc. provides the gain and contributes to the phase shift. White noise, frequency selectivity, gain greater than 1, and 180 degrees phase shift are absolute requirements for an oscillator. In the absence of any one there is NO oscillator. The white noise provides the starting conditions for oscillation!!! John Smith wrote: Hmmm... No, I don't believe I will have to read anything... But, if you can't tell the difference between a white noise generator and an osc giving a clean fundamental signal with greatly suppressed/filtered harmonics (or even, non-existent harmonics), you may wish to read-up before taking that project to the air... John |
Does that mean you don't maintain your equipment or know what to look
for when you open the cover? Amateur Radio is supposed to encourage self learning in some [SOME] phase of the electronic disciplines associated with the generation, transmission, and reception of electromagnetic signals. I consider that self learning requires more than finding and using the ON/OFF button. John Smith wrote: ... in the "olden days" it was expected you would be building that equipment you were being tested on ... ... of course logic and reason now demands the removal of those questions ... John "Ham op" wrote in message ... Caveat Lector wrote: Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? Then why ask these questions on a 2005 Ham test ?? Maybe ask about a VCO or a crowbar circuit ?? You miss the point! Totally missed the point!! In the 'olden days', the exams were not multiple guess questions; and, they were answered in front of an FCC Engineer. In the olden days one had to commit to some real effort to get a license. In human nature we VALUE that which we work for or invest for. The crime in ham radio today is the 5 hour Saturday morning cram session followed by a VE session; followed by a license; followed by loss of interest in a year or so. I live in a small town with 14 licensed 'hams' with only one active [me] and only one HF station [mine]. IMO there is a significant difference between number of licenses issued or valid and how many hams are on the air. |
Point well made!! AMEN !!
Fred W4JLE wrote: The same day I took the test for General, I also took and passed all requirements for a first class Phone with RADAR endorsement. The engineer administering the test told me if I wanted to take a really tough test, the amateur extra was the most difficult given by the FCC. Unfortunately at that time one had to wait a year to take advanced and two years to take the Extra. I would sure like to see them reinstate the time requirements so some of these young bucks could get a little seasoning before advancing. Today you can get it all in one day. Then armed with your brand new Extra; proceed to E-Ham and ask questions in the Elmer conference that could be answered by an old time novice. "Ham op" wrote in message ... The required level of knowledge for a license today is significantly poorer than 40 or 50 years ago. |
Ham op:
Absolutely! Any amp is an oscillator, any oscillator is an amp... just depends on how ya use it (mainly feedback.) There is also the subjects of "thermal noise" and "quantum noise", both contribute to the ease which with a circuit begins and sustains oscillations... Well, unless the laws of physics have changed! John "Ham op" wrote in message ... John, I'm very serious when I say that 'white noise' is critical to Colpitts/Hartley oscillator operation. The feedback equation for oscillation requires a voltagecurrent gain greater than 1 and a phase shift of 180 degrees [in simplified terms]. Starting conditions, in the absence of white noise, has zero input voltage and hence zero output voltage and therefore no oscillation! The presence of white noise provides the starting conditions, the Vin to be amplified, and the tuned circuit, L and C, provides the frequency discrimination, and the fundamental frequency of the oscillator. The Capacitive voltage divider [Colpitts] or the Inductive voltage divider [Hartley] provides the feedback factor. The active device, tube, transistor, FET, etc. provides the gain and contributes to the phase shift. White noise, frequency selectivity, gain greater than 1, and 180 degrees phase shift are absolute requirements for an oscillator. In the absence of any one there is NO oscillator. The white noise provides the starting conditions for oscillation!!! John Smith wrote: Hmmm... No, I don't believe I will have to read anything... But, if you can't tell the difference between a white noise generator and an osc giving a clean fundamental signal with greatly suppressed/filtered harmonics (or even, non-existent harmonics), you may wish to read-up before taking that project to the air... John |
Ham op:
Just where do you get a soldering iron which is small enough to deal with smc components, these boards are done by machine. The world has gone surface mount technology yanno... I only work on the mikes, low pass/high pass/bandpass filters, linears and feedlines, antennas, parts which are still big enough to handle... My receiver is a PCI card for my computer (100khz-180Mhz, there are a couple of birdies on the 2.8Ghz it is mounted in, these were not apparent when it was in a 900Mhz motherboard) and the xmitter is a continuous full coverage 3-5 watt transmitter PCI card 100khz-250mhz... computer sound card doubles as the output audio for the receiver and dsp mike input for the transmitter... driver/linear is external... different faces(skins) for the receiver (on the monitor) are software selectable, any mode is possible, with the proper software--even those NOT invented yet... My "equip" is pretty much my computer these days, but I do have some ancient gonset, johnson, hallicrafters, drake which I have not used in over a year. Got some heavy duty chicken band equip too, but the computer is highly capable of 11 meters, but not type accepted for CB... John John "Ham op" wrote in message ... Does that mean you don't maintain your equipment or know what to look for when you open the cover? Amateur Radio is supposed to encourage self learning in some [SOME] phase of the electronic disciplines associated with the generation, transmission, and reception of electromagnetic signals. I consider that self learning requires more than finding and using the ON/OFF button. John Smith wrote: ... in the "olden days" it was expected you would be building that equipment you were being tested on ... ... of course logic and reason now demands the removal of those questions ... John "Ham op" wrote in message ... Caveat Lector wrote: Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? Then why ask these questions on a 2005 Ham test ?? Maybe ask about a VCO or a crowbar circuit ?? You miss the point! Totally missed the point!! In the 'olden days', the exams were not multiple guess questions; and, they were answered in front of an FCC Engineer. In the olden days one had to commit to some real effort to get a license. In human nature we VALUE that which we work for or invest for. The crime in ham radio today is the 5 hour Saturday morning cram session followed by a VE session; followed by a license; followed by loss of interest in a year or so. I live in a small town with 14 licensed 'hams' with only one active [me] and only one HF station [mine]. IMO there is a significant difference between number of licenses issued or valid and how many hams are on the air. |
Nonsense John, today's college graduate is more in line with the high school
graduates of the fifties. I hired enough of your "highly educated" graduates to be more than a casual observer. They knew every thing there was to know about political correctness, liberal thinking, and how to bitch if they were not given everything on a platter the day they hired in. I assigned an engineer the task of designing a simple serial interface to a piece of equipment. He told me "we didn't cover that in school". Today A's are passed out to everyone, in some schools, so as not to make the others feel bad. Give me an old time ham or a Navy trained technician, at least they had the basics. Many of today's graduates are over paid at minimum wage. "John Smith" wrote in message ... Fred: Yes. But those were simple times when much of what we take for granted today loomed before us as dark mysteries... Things are much more complex these days, BS, MS, PHD's are much more common per capita and the general knowledge of the common person on the street is magnitudes greater than the times you are speaking of. No longer are people with a bit of knowledge in such demand. Our colleges turn out highly educated individuals in vast numbers which stagger the imagination. Indeed, seats in colleges are filled far too quickly, leaving no room for those not fortunate to gain entrance. It is quite possible the person you see before you in a lowly public service position has a degree. Across the board, +25% of all college grads are working at or near minimum wage in a field outside their course of study--five years after they graduate; I suspect this figure, which the colleges themselves claim, is rather low... John "Fred W4JLE" wrote in message ... The same day I took the test for General, I also took and passed all requirements for a first class Phone with RADAR endorsement. The engineer administering the test told me if I wanted to take a really tough test, the amateur extra was the most difficult given by the FCC. Unfortunately at that time one had to wait a year to take advanced and two years to take the Extra. I would sure like to see them reinstate the time requirements so some of these young bucks could get a little seasoning before advancing. Today you can get it all in one day. Then armed with your brand new Extra; proceed to E-Ham and ask questions in the Elmer conference that could be answered by an old time novice. "Ham op" wrote in message ... The required level of knowledge for a license today is significantly poorer than 40 or 50 years ago. |
Fred:
I disagree. Most of the problems we see in academia is that the mindset has changed. Older personalities have quite some difficulty in coping with the new generations, it has always been like that though, just more intense in this age (but what isn't?) The oldsters have a "control freak" attitude which the youngsters are not properly trained to deal with, I think the parents used to take care of this, and we in academia have failed the youngsters in not picking up as part of their training and education, when the mothers left home for work. And these new grads are a real and present danger to the oldsters, and we know it. The corps know it to, they can have a handful of these new grads for what one of us old farts demand for our "experience." (ancient historical knowledge) I felt them a threat to, and the young guys with those new minds can come up with new ideas with blazing speed. R&D ends up being a roomful of these guys and one old guy keeping heard over their "enthusiasm." The "generation gap" is wider than ever, and you need the "right guys" in senior positions which can interact with the new minds. Truth is, if you are 55 these days, you'd better think about retiring--before you embarrass your self or others about you... The world is changing as much as when the cotton gin was invented--most of the people back then died off without never being able to adapt to the "industrial age." We are just seeing it happen all again, but many are unaware of this history--and so end up repeating the same mistakes. John "Fred W4JLE" wrote in message ... Nonsense John, today's college graduate is more in line with the high school graduates of the fifties. I hired enough of your "highly educated" graduates to be more than a casual observer. They knew every thing there was to know about political correctness, liberal thinking, and how to bitch if they were not given everything on a platter the day they hired in. I assigned an engineer the task of designing a simple serial interface to a piece of equipment. He told me "we didn't cover that in school". Today A's are passed out to everyone, in some schools, so as not to make the others feel bad. Give me an old time ham or a Navy trained technician, at least they had the basics. Many of today's graduates are over paid at minimum wage. "John Smith" wrote in message ... Fred: Yes. But those were simple times when much of what we take for granted today loomed before us as dark mysteries... Things are much more complex these days, BS, MS, PHD's are much more common per capita and the general knowledge of the common person on the street is magnitudes greater than the times you are speaking of. No longer are people with a bit of knowledge in such demand. Our colleges turn out highly educated individuals in vast numbers which stagger the imagination. Indeed, seats in colleges are filled far too quickly, leaving no room for those not fortunate to gain entrance. It is quite possible the person you see before you in a lowly public service position has a degree. Across the board, +25% of all college grads are working at or near minimum wage in a field outside their course of study--five years after they graduate; I suspect this figure, which the colleges themselves claim, is rather low... John "Fred W4JLE" wrote in message ... The same day I took the test for General, I also took and passed all requirements for a first class Phone with RADAR endorsement. The engineer administering the test told me if I wanted to take a really tough test, the amateur extra was the most difficult given by the FCC. Unfortunately at that time one had to wait a year to take advanced and two years to take the Extra. I would sure like to see them reinstate the time requirements so some of these young bucks could get a little seasoning before advancing. Today you can get it all in one day. Then armed with your brand new Extra; proceed to E-Ham and ask questions in the Elmer conference that could be answered by an old time novice. "Ham op" wrote in message ... The required level of knowledge for a license today is significantly poorer than 40 or 50 years ago. |
On Thu, 28 Jul 2005 08:18:49 -0700, "Caveat Lector"
wrote: Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? Then why ask these questions on a 2005 Ham test ?? Maybe ask about a VCO or a crowbar circuit ?? Okay, draw me a circuit of a Colpitts VCO. Why you apparently think these are obsolete is beyond me. All sine wave oscillators, LC or crystal, are basically the same circuit with the only variable being the location of the rf common point. A lot of modern high voltage supplies would be better off if they had swinging chokes in them. My "modern" 8877 amp power supply uses a resonant choke. |
Wes:
Those osc are a thing of the past... Bring a junk am broadcast radio near your computer, you will hear literal dozens (well, a bunch anyway!) of osc's freqs going on there, probably not one being generated by a colpitts, hartley or pierce osc circuit... And, with the proper processing, all those waves could be a sine... John "Wes Stewart" wrote in message ... On Thu, 28 Jul 2005 08:18:49 -0700, "Caveat Lector" wrote: Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? Then why ask these questions on a 2005 Ham test ?? Maybe ask about a VCO or a crowbar circuit ?? Okay, draw me a circuit of a Colpitts VCO. Why you apparently think these are obsolete is beyond me. All sine wave oscillators, LC or crystal, are basically the same circuit with the only variable being the location of the rf common point. A lot of modern high voltage supplies would be better off if they had swinging chokes in them. My "modern" 8877 amp power supply uses a resonant choke. |
Ham op wrote:
The crime in ham radio today is the 5 hour Saturday morning cram session ... Would that be a felony or a misdemeanor? -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
Cecil:
Would an anger management class, perhaps, be order for such an offense? With the offender able to have all charges dismissed on successful completion of the class? Hate to see a fellow get a record for that... John "Cecil Moore" wrote in message ... Ham op wrote: The crime in ham radio today is the 5 hour Saturday morning cram session ... Would that be a felony or a misdemeanor? -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
On 2005-07-28, Fred W4JLE wrote:
Today you can get it all in one day. Then armed with your brand new Extra; proceed to E-Ham and ask questions in the Elmer conference that could be answered by an old time novice. Don't be silly! The first thing any new ham learns on the internet is that if you got your Extra after the 20wpm requirement was dropped, your questions will meet with nothing but scorn and derision! -- Ben Jackson http://www.ben.com/ |
Ben:
Be patient, we are in the process of upgrading all the elmers to no-coders now. Give us time, this is a major upgrade and results cannot be expected immediately. John "Ben Jackson" wrote in message ... On 2005-07-28, Fred W4JLE wrote: Today you can get it all in one day. Then armed with your brand new Extra; proceed to E-Ham and ask questions in the Elmer conference that could be answered by an old time novice. Don't be silly! The first thing any new ham learns on the internet is that if you got your Extra after the 20wpm requirement was dropped, your questions will meet with nothing but scorn and derision! -- Ben Jackson http://www.ben.com/ |
"results cannot be expected "
brilliant, absolutely brilliant |
Class A felony, Life without parole.
Cecil Moore wrote: Ham op wrote: The crime in ham radio today is the 5 hour Saturday morning cram session ... Would that be a felony or a misdemeanor? |
John Smith wrote:
Ham op: SNIPPED I only work on the mikes, low pass/high pass/bandpass filters, linears and feedlines, antennas, parts which are still big enough to handle... SNIPPED Well at my age, I only work on stuff I can see. That is limited by aging shakes in my hands. But I can still find a screw driver somewhere, if I can find my glasses. This morning I couldn't get out of bed when I woke up. I couldn't find the floor without my glasses. :-) It's a shame yo get old! |
Fred W4JLE wrote:
Nonsense John, today's college graduate is more in line with the high school graduates of the fifties. I hired enough of your "highly educated" graduates to be more than a casual observer. They knew every thing there was to know about political correctness, liberal thinking, and how to bitch if they were not given everything on a platter the day they hired in. I assigned an engineer the task of designing a simple serial interface to a piece of equipment. He told me "we didn't cover that in school". Today A's are passed out to everyone, in some schools, so as not to make the others feel bad. Give me an old time ham or a Navy trained technician, at least they had the basics. Many of today's graduates are over paid at minimum wage. I hired many newly degreed engineers in the 1980s. It took 5 to 8 years of actual work before they became real engineers. Several engineers from 'highly' accredited universities were dismissed because they wouldn't or couldn't write a simple technical report. Check the Harvard University graduation list. EVERYBODY is a high honors graduate!!! More than 90% of Harvard graduates are high honors. I find that hard to believe. |
On Thu, 28 Jul 2005 19:59:49 -0700, "John Smith"
wrote: Wes: Those osc are a thing of the past... I beg to differ. Bring a junk am broadcast radio near your computer, you will hear literal dozens (well, a bunch anyway!) of osc's freqs going on there, probably not one being generated by a colpitts, hartley or pierce osc circuit... And, with the proper processing, all those waves could be a sine... In all likelyhood, the master clock oscillator for the microprocessor is a Pierce xtal oscillator. All of the other garbage is derived from that. There may also be plug-in cards with their own clock, most likely another Pierce. In case you've forgotten, these are -digital- circuits, sine waves need not apply. Why you guys think that the computer guys have invented some new -magic- oscillator is beyond me. Wait a minute..... maybe I understand after all. |
Thank you - curiosity satisfied.
Just curious as how often these are used today I do know about colpitts, hartley, pierce, wien, clapp, TGTP, relaxation, crystal, negative resistance, dynatron, etc Anyone remember the dynatron oscillator? Tetrodes me lads tetrodes. -- CL -- I doubt, therefore I ask "Ham op" wrote in message ... Caveat Lector wrote: Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? Then why ask these questions on a 2005 Ham test ?? Maybe ask about a VCO or a crowbar circuit ?? All of them!!! The reference oscillator in every phase locked loop is generally a Colpitt's oscillator. I suspect that every oscillator in the VCO circuit is also Colpitt's. By simply asking the question you make the point!!! The required level of knowledge for a license today is significantly poorer than 40 or 50 years ago. |
Remember the golden rule!
"He who has the gold makes the rules" We old farts have it and the young bucks want it, makes us right no matter what! It is my intention to be a professional curmudgeon until I am looking at the grass from the bottom... "John Smith" wrote in message ... Fred: I disagree. Most of the problems we see in academia is that the mindset has changed. Older personalities have quite some difficulty in coping with the new generations, it has always been like that though, just more intense in this age (but what isn't?) |
The three most important things in life are attitude, attitude, and
attitude. Many of the new hams have yet to learn that lesson. It is my experience that scorn and derision are heaped on the deserving! "Ben Jackson" wrote in message ... On 2005-07-28, Fred W4JLE wrote: Don't be silly! The first thing any new ham learns on the internet is that if you got your Extra after the 20wpm requirement was dropped, your questions will meet with nothing but scorn and derision! -- Ben Jackson http://www.ben.com/ |
And thus the reason for "No Code / Slow Code".
The mantra today is "I want it so give it to me!" Then justify it by claming those that have learned the requirements are just trying to feel superior. A real no no in these days of no score soccer games... Someday they will realize the animus is not about code, it is about their attitudes. "Ham op" wrote in message ... Check the Harvard University graduation list. EVERYBODY is a high honors graduate!!! More than 90% of Harvard graduates are high honors. I find that hard to believe. |
Nope the FCC makes the rules
You can beat up on the new non-technical hams OR help them The choice is yours. In our area, we run a weekly 2M Ham Help net Our repeater is open to any technical question, no matter how basic. Periodic classes are conducted for Tech and General -- success rate is quite high. And many of our no-code Techs are very active in emergency communications, PR communicators, field day, and many other useful avenues of ham radio. Quite a number have advanced to General and Extra. The times is a changing -- Bob Dylan -- CL -- A 20 wpm Extra since 1979 "Fred W4JLE" wrote in message ... Remember the golden rule! "He who has the gold makes the rules" We old farts have it and the young bucks want it, makes us right no matter what! It is my intention to be a professional curmudgeon until I am looking at the grass from the bottom... "John Smith" wrote in message ... Fred: I disagree. Most of the problems we see in academia is that the mindset has changed. Older personalities have quite some difficulty in coping with the new generations, it has always been like that though, just more intense in this age (but what isn't?) |
Negative resistance comes to mind...
"Caveat Lector" wrote in message news:IsrGe.22435$HV1.3739@fed1read07... Anyone remember the dynatron oscillator? Tetrodes me lads tetrodes. -- CL -- I doubt, therefore I ask "Ham op" wrote in message ... Caveat Lector wrote: Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? Then why ask these questions on a 2005 Ham test ?? Maybe ask about a VCO or a crowbar circuit ?? All of them!!! The reference oscillator in every phase locked loop is generally a Colpitt's oscillator. I suspect that every oscillator in the VCO circuit is also Colpitt's. By simply asking the question you make the point!!! The required level of knowledge for a license today is significantly poorer than 40 or 50 years ago. |
Fred W4JLE wrote:
The mantra today is "I want it so give it to me!" My dog is like that but I love her anyway. And it's typical of most animal species. So shouldn't the blame lie instead with the governmental bureaucrats who freely dole out the welfare packages? -- 73, Cecil, http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
Indeed negative resistance it be
A tetrode with grid and plate potentials so arranged that plate current decreases when plate potential increases. -------------------------------------------------------------------------------- -- CL -- I doubt, therefore I might be ! "Fred W4JLE" wrote in message ... Negative resistance comes to mind... "Caveat Lector" wrote in message news:IsrGe.22435$HV1.3739@fed1read07... Anyone remember the dynatron oscillator? Tetrodes me lads tetrodes. -- CL -- I doubt, therefore I ask "Ham op" wrote in message ... Caveat Lector wrote: Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or a swinging choke ?? Then why ask these questions on a 2005 Ham test ?? Maybe ask about a VCO or a crowbar circuit ?? All of them!!! The reference oscillator in every phase locked loop is generally a Colpitt's oscillator. I suspect that every oscillator in the VCO circuit is also Colpitt's. By simply asking the question you make the point!!! The required level of knowledge for a license today is significantly poorer than 40 or 50 years ago. |
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