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