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#1
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Newby question: VFO
The instruction manual that comes with my brand new R75 talks about memory and VFO. I understand memory, but what is VFO? TIA, Larry Rogers Hilo -- Lawrence Rogers Hilo, Hawaii 96720-4091 Re Tokyo Stories see http://www.ucpress.edu/books/pages/8407.html |
#2
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Variable Frequency Oscillator--basically the tuning knob, or slew tuning
buttons as the case may be. I believe it to be somewhat more evolved than the tuner that adjusts a large tuning capacitor, but then maybe not. In any case when you turn the VFO, you are changing the frequency you are listening to. "Lawrence Rogers" wrote in message ... The instruction manual that comes with my brand new R75 talks about memory and VFO. I understand memory, but what is VFO? TIA, Larry Rogers Hilo -- Lawrence Rogers Hilo, Hawaii 96720-4091 Re Tokyo Stories see http://www.ucpress.edu/books/pages/8407.html --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.518 / Virus Database: 316 - Release Date: 9/12/2003 |
#3
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FYI: Modern radios use a digital tuning scheme -- a synthesized VFO
The "large tuning capacitor" types were analog tuning New Digital types like your R75 -- are in selectable discrete steps i.e., from as low as 1 Hertz -- up to 100 kHz see -- page 12 and 13 of the ICOM Manual. Also a 1 MHz "Quick Tuning" increment can be used for fast tuning. -- 73 From The Signal In The Noise Caveat Lector Ya All "John Garrison" wrote in message ... Variable Frequency Oscillator--basically the tuning knob, or slew tuning buttons as the case may be. I believe it to be somewhat more evolved than the tuner that adjusts a large tuning capacitor, but then maybe not. In any case when you turn the VFO, you are changing the frequency you are listening to. "Lawrence Rogers" wrote in message ... The instruction manual that comes with my brand new R75 talks about memory and VFO. I understand memory, but what is VFO? TIA, Larry Rogers Hilo -- Lawrence Rogers Hilo, Hawaii 96720-4091 Re Tokyo Stories see http://www.ucpress.edu/books/pages/8407.html --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.518 / Virus Database: 316 - Release Date: 9/12/2003 |
#4
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Much clearer for the original poster with the distinction between analog and
digital. Didn't think of any of that for some reason. Digital tuning, phase locked loop and all though can open a can of worms for the newbie to digest. Despite that all my radios have a digital VFO, when I turn the darn thing I think of strings and a big capacitor being adjusted. Oh well. "Caveat Lector" wrote in message news:3uF9b.135768$kP.76555@fed1read03... FYI: Modern radios use a digital tuning scheme -- a synthesized VFO The "large tuning capacitor" types were analog tuning New Digital types like your R75 -- are in selectable discrete steps i.e., from as low as 1 Hertz -- up to 100 kHz see -- page 12 and 13 of the ICOM Manual. Also a 1 MHz "Quick Tuning" increment can be used for fast tuning. -- 73 From The Signal In The Noise Caveat Lector Ya All "John Garrison" wrote in message ... Variable Frequency Oscillator--basically the tuning knob, or slew tuning buttons as the case may be. I believe it to be somewhat more evolved than the tuner that adjusts a large tuning capacitor, but then maybe not. In any case when you turn the VFO, you are changing the frequency you are listening to. "Lawrence Rogers" wrote in message ... The instruction manual that comes with my brand new R75 talks about memory and VFO. I understand memory, but what is VFO? TIA, Larry Rogers Hilo -- Lawrence Rogers Hilo, Hawaii 96720-4091 Re Tokyo Stories see http://www.ucpress.edu/books/pages/8407.html --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.518 / Virus Database: 316 - Release Date: 9/12/2003 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.518 / Virus Database: 316 - Release Date: 9/11/2003 |
#5
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Lawrence Rogers wrote:
The instruction manual that comes with my brand new R75 talks about memory and VFO. I understand memory, but what is VFO? In general it refers to the ability of a receiver to tune a wide range of frequencies with a 'Variable Frequency Oscillator' or VFO. More specifically for the R75 and other similar receivers, it means there is a dedicated memory which stores one or more frequencies which can be accessed by pushing the VFO button(s) instead of using the regular memory buttons. This allows the user to quickly change from one frequency to another with a single push of a button. -----= 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! =----- |
#6
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VFO -- Variable Frequency Oscillator.
Easy explanation -- like the tuning dial on a basic Am or FM radio. When you are in the VFO mode, the main tuning dial is rotated to the desired frequency or to tune in a station. Old style VFO's were continuous tuning. Analog New Digital types like your R75 -- are in selectable discrete steps i.e., from as low as 1 Hertz -- up to 100 kHz see -- page 12 and 13 of the ICOM Manual. Also a 1 MHz "Quick Tuning" increment can be used for fast tuning. -- 73 From The Signal In The Noise Caveat Lector Ya All "Lawrence Rogers" wrote in message ... The instruction manual that comes with my brand new R75 talks about memory and VFO. I understand memory, but what is VFO? TIA, Larry Rogers Hilo -- Lawrence Rogers Hilo, Hawaii 96720-4091 Re Tokyo Stories see http://www.ucpress.edu/books/pages/8407.html |
#7
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LR,
I guess today "VFO" is a manufacture selling feature "BUZZ" Word. Except for the earliest receivers all radios have some form of "VFO" (Local Oscillator) Long age Amateur (HAM) Transmitters and Transceivers were 'fix frequency' and Crystal Controlled for frequency stability. The external [High Stability] Variable Frequency Oscillator (VFO) was an up-grade for old HAM Radios. Then the next step was, a new 'needed' selling feature of a HAM Radio became a built-in "VFO". Finally BCL/SWLs were sold on the 'idea' (a selling concept) that quality "Communications" Receivers needed a "VFO" to be the equal of the HAMs Transceivers. TBL: The "VFO" is a good and needed feature of any modern Communications Receiver. mttidnk ~ RHF .. .. = = = (Lawrence Rogers) = = = wrote in message ... The instruction manual that comes with my brand new R75 talks about memory and VFO. I understand memory, but what is VFO? TIA, Larry Rogers Hilo |
#8
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In article ,
Lawrence Rogers wrote: The instruction manual that comes with my brand new R75 talks about memory and VFO. I understand memory, but what is VFO? TIA, Larry Rogers Hilo This is just the ham-radio heritage of ICOM showing through. VFO is ham jargon, its the acronym for Variable Frequency Oscillator. Here, it means the same thing as Continuous Tuning. On the R75, the difference between memory & VFO modes becomes most important when you punch the SCAN button. In VFO mode, the frequency starts changing continuously, as if some internal motor were turning the tuning knob. Push SCAN in Memory mode, and the R75 starts jumping through the preset channels without covering any frequencies "between". -- R F Wieland Newark, DE 19711-5323 USA 39.68N 75.74W Icom R75 Heathkit GR-81 Inverted-L in the attic Reply to wieland at me dot udel dot edu |
#9
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Close - but not really "continuous tuning" like an analog tuned receiver.
For New Digital types like your R75 -- the VFO tuning is in selectable discrete steps i.e., from as low as 1 Hertz -- up to 100 kHz see -- page 12 and 13 of the ICOM Manual. Also a 1 MHz "Quick Tuning" increment can be used for fast tuning. And many mil and commercial rigs -- use the term VFO - so not an exclusive Ham term per se -- 73 From The Signal In The Noise Caveat Lector Ya All ==================== "Robert F Wieland" wrote in message ... In article , Lawrence Rogers wrote: The instruction manual that comes with my brand new R75 talks about memory and VFO. I understand memory, but what is VFO? TIA, Larry Rogers Hilo This is just the ham-radio heritage of ICOM showing through. VFO is ham jargon, its the acronym for Variable Frequency Oscillator. Here, it means the same thing as Continuous Tuning. On the R75, the difference between memory & VFO modes becomes most important when you punch the SCAN button. In VFO mode, the frequency starts changing continuously, as if some internal motor were turning the tuning knob. Push SCAN in Memory mode, and the R75 starts jumping through the preset channels without covering any frequencies "between". -- R F Wieland Newark, DE 19711-5323 USA 39.68N 75.74W Icom R75 Heathkit GR-81 Inverted-L in the attic Reply to wieland at me dot udel dot edu |
#10
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Caveat Lector wrote:
Close - but not really "continuous tuning" like an analog tuned receiver. For all practical purposes a tuning step of 1-Hz is continuous. This tuning rate is common on high end receivers. -----= 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! =----- |
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