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

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


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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.


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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

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

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


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Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
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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

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

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

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.


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