|
I'm done. You're touchier than I usually am.
{+_+}
On 20221128 06:11:17, Gedas wrote:
toggle quoted message
Show quoted text
NOT
nonetheless !
You are
erroneously making assumptions followed by false statements
about what I want and what I said. I make no statements of
what I want other than to satisfy my curiosity to see how my
particular SDR and console react to different RF input
levels ! At no time do I ever state I am trying to achieve
or have found "optimum gain setup" or that I am trying to
turn my small SDR & console into a "precision
instrument".
Gedas, W8BYA EN70JT
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 11/28/2022 1:27 AM, jdow wrote:
Nonetheless, optimum gain setup is unique to the front end
and the use. Some need absolute maximum sensitivity and have
an environment that supports it. Others have really bad
environments and must sacrifice sensitivity (noise figure) for
dynamic range. And most are somewhere in the middle.
S-Meter behavior is an ongoing discussion with Simon.
I will note that if you are trying to make SDRC and your
front end into a precision instrument I suspect you will find
yourself frustrated by odd details of the SDRC DSP
implementation This specifically is why I made my comment.
It's been litigated before, often, to no avail.
{^_^}
On 20221127 22:07:49, Gedas wrote:
Don't
put words in my mouth. At no point did I say I was
pleased. I said that I was surprised to find a setting
for RF, IF, and visual gain that did a fair job of
reporting the true absolute RF input signal level. And
if you did watch the video, in the beginning, I stated
that the goal was to simply see if 10 dB changes in RF
input level would result in 10 dB changes as reported by
console using different RF, IF, and visual gain
settings. Nothing more nothing less.
Gedas, W8BYA
EN70JT Gallery at http://w8bya.com
Light travels faster than sound.... This is why some people
appear bright until you hear them speak.
On 11/28/2022 12:18 AM, jdow
wrote:
You're pleased. That is, in the end, what matters. I have
STRONG opinions about gain and filter distribution. (...
and about how an S-Meter should work in dBm mode.) I
figure watching somebody else limp in on settings like
this is enough to spark a coronary infarction. So I'll
pass on viewing it.
{^_^}
On 20221127 16:32:00, Gedas
wrote:
Hello
gang. Interesting chat about the various settings on
different receivers. I know some have already seen
this (apologies to you). For those that have not
here is a video I made using console with my RSPdx
as I put in calibrated signal levels and changed
combinations of Visual gain, RF gain and IF gain.
I
suggest running the video at 1.5X speed as I tend to
put folks to sleep. And pse forgive the jerky video
as I was hand holding a camcorder in my left hand.
The
very last part of the video was a pleasant surprise
as I found a combination that was not only linear in
response over a fair range but was accurate to
within a dB (absolute).
https://www.youtube.com/watch?v=qHJE6wa9dVw
Gedas, W8BYA
EN70JT Gallery at http://w8bya.com
Light travels faster than sound.... This is why some
people appear bright until you hear them speak.
On 11/24/2022 10:45 PM, jdow
wrote:
He was going to redo "Visual Gain" to make it a real
visual gain control that simply scales the displays.
As it is the last I knew the visual gain control was a
literal digital gain applied to the entire system
which led to some unfortunate behavior. Simon was
going to doctor this last I knew. But, I may have
missed his actually doing it as I do not think it's
been fixed yet.
{^_^}
On 20221124 17:44:05,
Siegfried Jackstien wrote:
don´t you have also "visual gain" in all sdr used??
that could be done in 1 db steps so finetune of any
sdr to correct readings should be possible
if no visual gain in all sdr setups under "radio"
settings ... then you could add it where that is
missing
rtl for example has fine steps (but not exactly 1
db) and visual gain in 5 db steps
maybe a finer resolution also in visual gain
possible instead coarse 5 db steps??
pluto has fine steps on gain AND visual gain
(perfect!)
airspy hf+ has preamp on/off, att from 0-48 in 6 db
stebs and visual gain in 5 db steps (-40 to +30db)
... also there a finer visual gain could be added in
1 db steps
i think if you have at least the visual gain in
fine steps on all different sdr setups a good s
meter calibration should be possible on all sdr
and visual gain does not depend on used hardware so
change that to finer steps should be easy.. not??
maybe a number box with up down buttons instead a
dropdown list?? (just thinking)
dg9bfc sigi
Am 23.11.2022 um 18:16
schrieb Simon Brown:
OK,
Some of these
radios have fixed attenuation options, for example
NetSDR. HF+ - I'll have to check.
Greetings,
NetSDR, Icom RS-6500 and
Airspy Discovery
Vincent
Sent from Mail for Windows
Greetings,
I have always wondered why attenuation
settings both hardware and software or in
10db increments and not variable? is this a
hardware issue or software issue? Many
times, 10-30db increments is too much and
something between these settings is better.
Vincent
--
--
-
+ - + -
|
|
|
Brent Seres/ VE3CUS
I have an RSP2 and I had to build a notch filter to eliminate overload from our local 800 khz station.
|
|
|
Kriss Kliegle KA1GJU
You wouldn't happen to have an RSPA 1A in your arsenal? Would be interesting to see just how poorly I operate mine.
I still have one left on my server, but I'd rather use the Airspy HF Discovery to to less fiddling to get 'decent' results.
Plus the three other SDR's on that server have to have an AM BC filter since the RSPA1A gets swamped with images. Lightning
took the other two our years ago. LOL
They'll be no tears shed when I can remove it and the AM BC filter it requires on "KA1GJU Super Station #2" and allow users to use that site for AM DXing.
The RF Gain in the radio settings are vastly different, mine only has 0 thru 9 and not linear, hence my asking. Plus the IF Gain has to be in Manual or there will be serious pumping of the AGC if any strong signals appear in the band.
73 Kriss KA1GJU
|
|
|
NOT nonetheless !
You are erroneously making
assumptions followed by false statements about what I want and
what I said. I make no statements of what I want other than to
satisfy my curiosity to see how my particular SDR and console
react to different RF input levels ! At no time do I ever
state I am trying to achieve or have found "optimum gain
setup" or that I am trying to turn my small SDR & console
into a "precision instrument".
Gedas, W8BYA EN70JT
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 11/28/2022 1:27 AM, jdow wrote:
toggle quoted message
Show quoted text
Nonetheless, optimum gain setup is unique to the front end and
the use. Some need absolute maximum sensitivity and have an
environment that supports it. Others have really bad
environments and must sacrifice sensitivity (noise figure) for
dynamic range. And most are somewhere in the middle.
S-Meter behavior is an ongoing discussion with Simon.
I will note that if you are trying to make SDRC and your front
end into a precision instrument I suspect you will find yourself
frustrated by odd details of the SDRC DSP implementation This
specifically is why I made my comment. It's been litigated
before, often, to no avail.
{^_^}
On 20221127 22:07:49, Gedas wrote:
Don't put
words in my mouth. At no point did I say I was pleased. I
said that I was surprised to find a setting for RF, IF,
and visual gain that did a fair job of reporting the true
absolute RF input signal level. And if you did watch the
video, in the beginning, I stated that the goal was to
simply see if 10 dB changes in RF input level would result
in 10 dB changes as reported by console using different
RF, IF, and visual gain settings. Nothing more nothing
less.
Gedas, W8BYA EN70JT
Gallery at http://w8bya.com
Light travels faster than sound.... This is why some people
appear bright until you hear them speak.
On 11/28/2022 12:18 AM, jdow wrote:
You're pleased. That is, in the end, what matters. I have
STRONG opinions about gain and filter distribution. (... and
about how an S-Meter should work in dBm mode.) I figure
watching somebody else limp in on settings like this is
enough to spark a coronary infarction. So I'll pass on
viewing it.
{^_^}
On 20221127 16:32:00, Gedas
wrote:
Hello
gang. Interesting chat about the various settings on
different receivers. I know some have already seen
this (apologies to you). For those that have not here
is a video I made using console with my RSPdx as I put
in calibrated signal levels and changed combinations
of Visual gain, RF gain and IF gain.
I
suggest running the video at 1.5X speed as I tend to
put folks to sleep. And pse forgive the jerky video as
I was hand holding a camcorder in my left hand.
The
very last part of the video was a pleasant surprise as
I found a combination that was not only linear in
response over a fair range but was accurate to within
a dB (absolute).
https://www.youtube.com/watch?v=qHJE6wa9dVw
Gedas, W8BYA
EN70JT Gallery at http://w8bya.com
Light travels faster than sound.... This is why some
people appear bright until you hear them speak.
On 11/24/2022 10:45 PM, jdow
wrote:
He was going to redo "Visual Gain" to make it a real
visual gain control that simply scales the displays. As
it is the last I knew the visual gain control was a
literal digital gain applied to the entire system which
led to some unfortunate behavior. Simon was going to
doctor this last I knew. But, I may have missed his
actually doing it as I do not think it's been fixed yet.
{^_^}
On 20221124 17:44:05,
Siegfried Jackstien wrote:
don´t you have also "visual gain" in all sdr used??
that could be done in 1 db steps so finetune of any
sdr to correct readings should be possible
if no visual gain in all sdr setups under "radio"
settings ... then you could add it where that is
missing
rtl for example has fine steps (but not exactly 1 db)
and visual gain in 5 db steps
maybe a finer resolution also in visual gain possible
instead coarse 5 db steps??
pluto has fine steps on gain AND visual gain
(perfect!)
airspy hf+ has preamp on/off, att from 0-48 in 6 db
stebs and visual gain in 5 db steps (-40 to +30db) ...
also there a finer visual gain could be added in 1 db
steps
i think if you have at least the visual gain in fine
steps on all different sdr setups a good s meter
calibration should be possible on all sdr
and visual gain does not depend on used hardware so
change that to finer steps should be easy.. not??
maybe a number box with up down buttons instead a
dropdown list?? (just thinking)
dg9bfc sigi
Am 23.11.2022 um 18:16
schrieb Simon Brown:
OK,
Some of these
radios have fixed attenuation options, for example
NetSDR. HF+ - I'll have to check.
Greetings,
NetSDR, Icom RS-6500 and
Airspy Discovery
Vincent
Sent from Mail for Windows
Greetings,
I have always wondered why attenuation
settings both hardware and software or in 10db
increments and not variable? is this a
hardware issue or software issue? Many times,
10-30db increments is too much and something
between these settings is better.
Vincent
--
--
- + -
+ -
|
|
|
Nonetheless, optimum gain setup is unique to the front end and
the use. Some need absolute maximum sensitivity and have an
environment that supports it. Others have really bad environments
and must sacrifice sensitivity (noise figure) for dynamic range.
And most are somewhere in the middle.
S-Meter behavior is an ongoing discussion with Simon.
I will note that if you are trying to make SDRC and your front
end into a precision instrument I suspect you will find yourself
frustrated by odd details of the SDRC DSP implementation This
specifically is why I made my comment. It's been litigated before,
often, to no avail.
{^_^}
On 20221127 22:07:49, Gedas wrote:
toggle quoted message
Show quoted text
Don't put
words in my mouth. At no point did I say I was pleased. I
said that I was surprised to find a setting for RF, IF, and
visual gain that did a fair job of reporting the true
absolute RF input signal level. And if you did watch the
video, in the beginning, I stated that the goal was to
simply see if 10 dB changes in RF input level would result
in 10 dB changes as reported by console using different RF,
IF, and visual gain settings. Nothing more nothing less.
Gedas, W8BYA EN70JT
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 11/28/2022 12:18 AM, jdow wrote:
You're pleased. That is, in the end, what matters. I have
STRONG opinions about gain and filter distribution. (... and
about how an S-Meter should work in dBm mode.) I figure
watching somebody else limp in on settings like this is enough
to spark a coronary infarction. So I'll pass on viewing it.
{^_^}
On 20221127 16:32:00, Gedas wrote:
Hello
gang. Interesting chat about the various settings on
different receivers. I know some have already seen this
(apologies to you). For those that have not here is a
video I made using console with my RSPdx as I put in
calibrated signal levels and changed combinations of
Visual gain, RF gain and IF gain.
I
suggest running the video at 1.5X speed as I tend to put
folks to sleep. And pse forgive the jerky video as I was
hand holding a camcorder in my left hand.
The very
last part of the video was a pleasant surprise as I
found a combination that was not only linear in response
over a fair range but was accurate to within a dB
(absolute).
https://www.youtube.com/watch?v=qHJE6wa9dVw
Gedas, W8BYA
EN70JT Gallery at http://w8bya.com
Light travels faster than sound.... This is why some people
appear bright until you hear them speak.
On 11/24/2022 10:45 PM, jdow
wrote:
He was going to redo "Visual Gain" to make it a real
visual gain control that simply scales the displays. As it
is the last I knew the visual gain control was a literal
digital gain applied to the entire system which led to
some unfortunate behavior. Simon was going to doctor this
last I knew. But, I may have missed his actually doing it
as I do not think it's been fixed yet.
{^_^}
On 20221124 17:44:05, Siegfried
Jackstien wrote:
don´t you have also "visual gain" in all sdr used??
that could be done in 1 db steps so finetune of any sdr
to correct readings should be possible
if no visual gain in all sdr setups under "radio"
settings ... then you could add it where that is missing
rtl for example has fine steps (but not exactly 1 db)
and visual gain in 5 db steps
maybe a finer resolution also in visual gain possible
instead coarse 5 db steps??
pluto has fine steps on gain AND visual gain (perfect!)
airspy hf+ has preamp on/off, att from 0-48 in 6 db
stebs and visual gain in 5 db steps (-40 to +30db) ...
also there a finer visual gain could be added in 1 db
steps
i think if you have at least the visual gain in fine
steps on all different sdr setups a good s meter
calibration should be possible on all sdr
and visual gain does not depend on used hardware so
change that to finer steps should be easy.. not??
maybe a number box with up down buttons instead a
dropdown list?? (just thinking)
dg9bfc sigi
Am 23.11.2022 um 18:16
schrieb Simon Brown:
OK,
Some of these
radios have fixed attenuation options, for example
NetSDR. HF+ - I'll have to check.
Greetings,
NetSDR, Icom RS-6500 and
Airspy Discovery
Vincent
Sent from Mail for Windows
Greetings,
I have always wondered why attenuation settings
both hardware and software or in 10db increments
and not variable? is this a hardware issue or
software issue? Many times, 10-30db increments
is too much and something between these settings
is better.
Vincent
--
--
- + - + -
|
|
|
Don't put words in my mouth.
At no point did I say I was pleased. I said that I was
surprised to find a setting for RF, IF, and visual gain that
did a fair job of reporting the true absolute RF input signal
level. And if you did watch the video, in the beginning, I
stated that the goal was to simply see if 10 dB changes in RF
input level would result in 10 dB changes as reported by
console using different RF, IF, and visual gain settings.
Nothing more nothing less.
Gedas, W8BYA EN70JT
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 11/28/2022 12:18 AM, jdow wrote:
toggle quoted message
Show quoted text
You're pleased. That is, in the end, what matters. I have
STRONG opinions about gain and filter distribution. (... and
about how an S-Meter should work in dBm mode.) I figure watching
somebody else limp in on settings like this is enough to spark a
coronary infarction. So I'll pass on viewing it.
{^_^}
On 20221127 16:32:00, Gedas wrote:
Hello
gang. Interesting chat about the various settings on
different receivers. I know some have already seen this
(apologies to you). For those that have not here is a
video I made using console with my RSPdx as I put in
calibrated signal levels and changed combinations of
Visual gain, RF gain and IF gain.
I suggest
running the video at 1.5X speed as I tend to put folks to
sleep. And pse forgive the jerky video as I was hand
holding a camcorder in my left hand.
The very
last part of the video was a pleasant surprise as I found
a combination that was not only linear in response over a
fair range but was accurate to within a dB (absolute).
https://www.youtube.com/watch?v=qHJE6wa9dVw
Gedas, W8BYA EN70JT
Gallery at http://w8bya.com
Light travels faster than sound.... This is why some people
appear bright until you hear them speak.
On 11/24/2022 10:45 PM, jdow wrote:
He was going to redo "Visual Gain" to make it a real visual
gain control that simply scales the displays. As it is the
last I knew the visual gain control was a literal digital
gain applied to the entire system which led to some
unfortunate behavior. Simon was going to doctor this last I
knew. But, I may have missed his actually doing it as I do
not think it's been fixed yet.
{^_^}
On 20221124 17:44:05, Siegfried
Jackstien wrote:
don´t you have also "visual gain" in all sdr used?? that
could be done in 1 db steps so finetune of any sdr to
correct readings should be possible
if no visual gain in all sdr setups under "radio"
settings ... then you could add it where that is missing
rtl for example has fine steps (but not exactly 1 db) and
visual gain in 5 db steps
maybe a finer resolution also in visual gain possible
instead coarse 5 db steps??
pluto has fine steps on gain AND visual gain (perfect!)
airspy hf+ has preamp on/off, att from 0-48 in 6 db stebs
and visual gain in 5 db steps (-40 to +30db) ... also
there a finer visual gain could be added in 1 db steps
i think if you have at least the visual gain in fine
steps on all different sdr setups a good s meter
calibration should be possible on all sdr
and visual gain does not depend on used hardware so
change that to finer steps should be easy.. not??
maybe a number box with up down buttons instead a
dropdown list?? (just thinking)
dg9bfc sigi
Am 23.11.2022 um 18:16 schrieb
Simon Brown:
OK,
Some of these radios
have fixed attenuation options, for example NetSDR. HF+
- I'll have to check.
Greetings,
NetSDR, Icom RS-6500 and Airspy
Discovery
Vincent
Sent from Mail for Windows
Greetings,
I have always wondered why attenuation settings
both hardware and software or in 10db increments
and not variable? is this a hardware issue or
software issue? Many times, 10-30db increments is
too much and something between these settings is
better.
Vincent
--
--
- + - + -
|
|
|
You're pleased. That is, in the end, what matters. I have STRONG
opinions about gain and filter distribution. (... and about how an
S-Meter should work in dBm mode.) I figure watching somebody else
limp in on settings like this is enough to spark a coronary
infarction. So I'll pass on viewing it.
{^_^}
On 20221127 16:32:00, Gedas wrote:
toggle quoted message
Show quoted text
Hello gang.
Interesting chat about the various settings on different
receivers. I know some have already seen this (apologies to
you). For those that have not here is a video I made using
console with my RSPdx as I put in calibrated signal levels
and changed combinations of Visual gain, RF gain and IF
gain.
I suggest
running the video at 1.5X speed as I tend to put folks to
sleep. And pse forgive the jerky video as I was hand holding
a camcorder in my left hand.
The very
last part of the video was a pleasant surprise as I found a
combination that was not only linear in response over a fair
range but was accurate to within a dB (absolute).
https://www.youtube.com/watch?v=qHJE6wa9dVw
Gedas, W8BYA EN70JT
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 11/24/2022 10:45 PM, jdow wrote:
He was going to redo "Visual Gain" to make it a real visual
gain control that simply scales the displays. As it is the
last I knew the visual gain control was a literal digital gain
applied to the entire system which led to some unfortunate
behavior. Simon was going to doctor this last I knew. But, I
may have missed his actually doing it as I do not think it's
been fixed yet.
{^_^}
On 20221124 17:44:05, Siegfried
Jackstien wrote:
don´t you have also "visual gain" in all sdr used?? that
could be done in 1 db steps so finetune of any sdr to
correct readings should be possible
if no visual gain in all sdr setups under "radio" settings
... then you could add it where that is missing
rtl for example has fine steps (but not exactly 1 db) and
visual gain in 5 db steps
maybe a finer resolution also in visual gain possible
instead coarse 5 db steps??
pluto has fine steps on gain AND visual gain (perfect!)
airspy hf+ has preamp on/off, att from 0-48 in 6 db stebs
and visual gain in 5 db steps (-40 to +30db) ... also there
a finer visual gain could be added in 1 db steps
i think if you have at least the visual gain in fine steps
on all different sdr setups a good s meter calibration
should be possible on all sdr
and visual gain does not depend on used hardware so change
that to finer steps should be easy.. not??
maybe a number box with up down buttons instead a dropdown
list?? (just thinking)
dg9bfc sigi
Am 23.11.2022 um 18:16 schrieb
Simon Brown:
OK,
Some of these radios
have fixed attenuation options, for example NetSDR. HF+ -
I'll have to check.
Greetings,
NetSDR, Icom RS-6500 and Airspy
Discovery
Vincent
Sent from Mail for Windows
Greetings,
I have always wondered why attenuation settings both
hardware and software or in 10db increments and not
variable? is this a hardware issue or software
issue? Many times, 10-30db increments is too much
and something between these settings is better.
Vincent
--
--
- + - + -
|
|
|
Also THANK you Joanne for explaining why variable attenuators are difficult to implement from manufatures
Sent from
Mail for Windows
toggle quoted message
Show quoted text
From: vince battle
Sent: Sunday, November 27, 2022 5:16 PM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Attenuation
Thank you my friend
Sent from
Mail for Windows
Vince,
There's a pdf on how to use SDRC via the remote servers and how to set up your own server in the files section. I was there today looking for the one I had posted years ago for the group. This is mostly my work, but somebody added more stuff to it and more
graphics, but posted it under my name. lol
https://sdr-radio.groups.io/g/main/files/Version3ServerHelpFiles
It's time for me to do an updated version since some of the stuff has changed since 2/17/2018!!!
73 Kriss KA1gju
|
|
|
Thank you my friend
Sent from
Mail for Windows
toggle quoted message
Show quoted text
From: Kriss Kliegle KA1GJU
Sent: Sunday, November 27, 2022 5:10 PM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Attenuation
Vince,
There's a pdf on how to use SDRC via the remote servers and how to set up your own server in the files section. I was there today looking for the one I had posted years ago for the group. This is mostly my work, but somebody added more stuff to it and more
graphics, but posted it under my name. lol
https://sdr-radio.groups.io/g/main/files/Version3ServerHelpFiles
It's time for me to do an updated version since some of the stuff has changed since 2/17/2018!!!
73 Kriss KA1gju
|
|
|
Kriss Kliegle KA1GJU
Vince, There's a pdf on how to use SDRC via the remote servers and how to set up your own server in the files section. I was there today looking for the one I had posted years ago for the group. This is mostly my work, but somebody added more stuff to it and more graphics, but posted it under my name. lol https://sdr-radio.groups.io/g/main/files/Version3ServerHelpFilesIt's time for me to do an updated version since some of the stuff has changed since 2/17/2018!!! 73 Kriss KA1gju
|
|
|
Hello gang. Interesting chat
about the various settings on different receivers. I know some
have already seen this (apologies to you). For those that have
not here is a video I made using console with my RSPdx as I
put in calibrated signal levels and changed combinations of
Visual gain, RF gain and IF gain.
I suggest running the video at
1.5X speed as I tend to put folks to sleep. And pse forgive
the jerky video as I was hand holding a camcorder in my left
hand.
The very last part of the
video was a pleasant surprise as I found a combination that
was not only linear in response over a fair range but was
accurate to within a dB (absolute).
https://www.youtube.com/watch?v=qHJE6wa9dVw
Gedas, W8BYA EN70JT
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 11/24/2022 10:45 PM, jdow wrote:
toggle quoted message
Show quoted text
He was going to redo "Visual Gain" to make it a real visual
gain control that simply scales the displays. As it is the last
I knew the visual gain control was a literal digital gain
applied to the entire system which led to some unfortunate
behavior. Simon was going to doctor this last I knew. But, I may
have missed his actually doing it as I do not think it's been
fixed yet.
{^_^}
On 20221124 17:44:05, Siegfried
Jackstien wrote:
don´t you have also "visual gain" in all sdr used?? that
could be done in 1 db steps so finetune of any sdr to correct
readings should be possible
if no visual gain in all sdr setups under "radio" settings
... then you could add it where that is missing
rtl for example has fine steps (but not exactly 1 db) and
visual gain in 5 db steps
maybe a finer resolution also in visual gain possible instead
coarse 5 db steps??
pluto has fine steps on gain AND visual gain (perfect!)
airspy hf+ has preamp on/off, att from 0-48 in 6 db stebs and
visual gain in 5 db steps (-40 to +30db) ... also there a
finer visual gain could be added in 1 db steps
i think if you have at least the visual gain in fine steps on
all different sdr setups a good s meter calibration should be
possible on all sdr
and visual gain does not depend on used hardware so change
that to finer steps should be easy.. not??
maybe a number box with up down buttons instead a dropdown
list?? (just thinking)
dg9bfc sigi
Am 23.11.2022 um 18:16 schrieb
Simon Brown:
OK,
Some of these radios
have fixed attenuation options, for example NetSDR. HF+ -
I'll have to check.
Greetings,
NetSDR, Icom RS-6500 and Airspy
Discovery
Vincent
Sent from Mail for Windows
Greetings,
I have always wondered why attenuation settings both
hardware and software or in 10db increments and not
variable? is this a hardware issue or software issue?
Many times, 10-30db increments is too much and
something between these settings is better.
Vincent
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Kriss,
First, thank you for the hand-holding and blunt comment, I finally got the SDRC server manger to work, night and day results. Thank you again, have a good day.
Vincent
Sent from
Mail for Windows
toggle quoted message
Show quoted text
From: Kriss Kliegle KA1GJU
Sent: Sunday, November 27, 2022 5:42 AM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Attenuation
Vince,
I'll be more blunt about my post...
It appears your issues are because you are operating SDRC via a Spyserver. If you ditch the Spyserver and run your equipment via SDRC Server, your issues will be resolved.
Nothing more, nothing less.
73 Kriss KA1GJU
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Kriss Kliegle KA1GJU
Vince,
I'll be more blunt about my post...
It appears your issues are because you are operating SDRC via a Spyserver. If you ditch the Spyserver and run your equipment via SDRC Server, your issues will be resolved.
Nothing more, nothing less.
73 Kriss KA1GJU
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Kriss Kliegle KA1GJU
If you place the scroll bar on the righthand side to where you want to view, leave it there. When screen refreshes, just click and hold and it will return back there. But you gotta read what you need real fast!
I believe it remains where you scrolled to on the iPad though.
I just use that to get an idea how my 5 servers are working and find where all the activity is. Too bad it only publishes the center frequency and bandwidth, not the actual frequency in use. hint hint nudge nudge
73 Kriss KA1GJU
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On Sat, Nov 26, 2022 at 11:07 PM, Don Moman VE6JY wrote:
That link refreshes so often, and returns you to the beginning of the list so can't even begin to see who is online....
Agree Don the auto-refresh is annoying as it keeps returning the list back to the top every 10 seconds. Could it be disabled to let people manually refresh, or at least have a tick-box option on the web page? Or I guess maybe as it is XML it's not intended to be viewed? Maybe it's for input to the server list in SDRC? Max
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That's a longish coffee table discussion and some digging into
how semiconductors really work. I do not know if I can do it
justice. So I'll make a grand statement with a very brief
descriptions of why.
Every variable attenuator I know for this use has very nasty
downsides. This also applies to variable gain amplifier stages.
For an example a diode can, for small signals, be a current
variable attenuator, roughly 25 ohms at 1ma current, 12.5 at 2 ma
, 50 at 0.5 ma. When the signal level becomes significant compared
to the current setting the nice exponential curve, a fancy Taylor
Series expansion for the nonlinearity involved) starts generating
appreciable IMD. So this sort of variable attenuator is best at
near zero attenuation and at maximum attenuation. At middle
settings IMD will increase. Another example, a typical voltage
variable gain stage for a bipolar transistor amplifier can use
this same resistance effect to vary the gains. But, at mid range
settings, IMD goes up. J-Fets can do moderately well, some MOSFETs
can do pretty well as voltage variable resistors, especially in
balanced configurations. Since the control voltage on the device
is higher than for bipolars the IMD issue is mitigated maybe 20
dB. This is good enough it is sometimes seen in some analog mixer
designs.
The whole picture is much more complex; but, I keep running into
the same basic issues. You have to work at quite low impedance
with LOTS of current in your devices to have it all work well for
you with minimal IMD. "LOTS" of current is an excessive term for
AirSpies. It is excessive even for RX888 MKII models.
(The real unfortunate situation is that the high attenuation
attenuator and reduced gain amplifier are MORE susceptible to IMD
in most conditions making the control VERY undesirable. It gets
worse when you need better.)
{^_^}
On 20221126 08:58:21, vince battle
wrote:
toggle quoted message
Show quoted text
Joanne,
I DO NOT use the Discovery with the 8600,
not sure where you got that. Ok, perhaps I didn’t ask my
question correctly, I understand that Simone only supports
what the hardware manufacture gives him to work with, So the
question is WHY doesn’t the hardware manufactures make
attenuation variable instead of fixed?
Sent from
Mail for Windows
The AirSpy discovery is pretty much designed to run with its
own agc active. But that is likely to be awkward for SSB
reception with the usual receiver AGC active. The hope is that
the time constant for the Discovery's AGC is long (for release
at least) compared to that used inside the SDR software.
Otherwise you get odd phenomena as you described. This is
compounded when you use the Discovery as an IF for the 8600.
It's not really designed for that use but you can in both
cases switch over to manual gain.
Setting up manual gain is not trivial. Maybe somebody who
knows noise figure work and has a Discovery in MGC mode can
describe their configuration.
{^_^}
On 20221125 17:03:44, vince battle wrote:
Hi Sigi,
I have “visual gain” only when I use the
Airspy Discovery, but the spectrum jumps up and down so
much, I stopped using the Airspy for voice and only use it
for “data” (FT8). Now I must confess I use remote
(spyserver) for the Airspy. I do not use the Icom RS8600
with SDRC because the “scan” functions are not operational
on SDRC.
My “still rocking” NetSDR does not have
“visual gain “available and I have too use the “RF gain”/
Vincent
Sent from
Mail for Windows
He was going to redo "Visual Gain" to make it a real visual
gain control that simply scales the displays. As it is the
last I knew the visual gain control was a literal digital
gain applied to the entire system which led to some
unfortunate behavior. Simon was going to doctor this last I
knew. But, I may have missed his actually doing it as I do
not think it's been fixed yet.
{^_^}
On 20221124 17:44:05, Siegfried
Jackstien wrote:
don´t you have also "visual gain" in all sdr used?? that
could be done in 1 db steps so finetune of any sdr to
correct readings should be possible
if no visual gain in all sdr setups under "radio"
settings ... then you could add it where that is missing
rtl for example has fine steps (but not exactly 1 db) and
visual gain in 5 db steps
maybe a finer resolution also in visual gain possible
instead coarse 5 db steps??
pluto has fine steps on gain AND visual gain (perfect!)
airspy hf+ has preamp on/off, att from 0-48 in 6 db stebs
and visual gain in 5 db steps (-40 to +30db) ... also
there a finer visual gain could be added in 1 db steps
i think if you have at least the visual gain in fine
steps on all different sdr setups a good s meter
calibration should be possible on all sdr
and visual gain does not depend on used hardware so
change that to finer steps should be easy.. not??
maybe a number box with up down buttons instead a
dropdown list?? (just thinking)
dg9bfc sigi
Am 23.11.2022 um 18:16 schrieb Simon
Brown:
Some of these radios have fixed
attenuation options, for example NetSDR. HF+ - I'll
have to check.
Greetings,
NetSDR, Icom RS-6500 and Airspy
Discovery
Vincent
Sent from
Mail for Windows
Greetings,
I have always wondered why attenuation settings
both hardware and software or in 10db increments
and not variable? is this a hardware issue or
software issue? Many times, 10-30db increments is
too much and something between these settings is
better.
Vincent
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Kriss,
I’m not sure if your comment is a joke or helpful?
Sent from
Mail for Windows
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That link refreshes so often, and returns you to the beginning of the list so can't even begin to see who is online....
On Sat, Nov 26, 2022 at 3:49 PM Kriss Kliegle KA1GJU < kliegle@...> wrote: Use Simon's SDRC Server and don't look back! hi hi
We could use more good servers (ie functioning properly, online, with decent antennas w/o massive QRM) on SDRC:
http://onairv3.sdrspace.com/onair-v3.xml
73 Kriss KA1GJU
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Kriss Kliegle KA1GJU
Use Simon's SDRC Server and don't look back! hi hi We could use more good servers (ie functioning properly, online, with decent antennas w/o massive QRM) on SDRC: http://onairv3.sdrspace.com/onair-v3.xml73 Kriss KA1GJU
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Kriss,
I’m running the Discovery remotely using the spyserver from SDRC.
I’m also running the newest SDRC version as of today.
If I operate the Discovery locally the behavior running remote is not there
The first video was 225khz and the second video was at 57khz
Vincent
Sent from
Mail for Windows
toggle quoted message
Show quoted text
From: Kriss Kliegle KA1GJU
Sent: Saturday, November 26, 2022 12:25 PM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Attenuation
What kind of server are you running it from? I don't recognize the radio settings options vs mine. Operating an Airspy or any SDR has the same options whether you are using one locally or via the SDRC Server (which I do 99% of the time).
How does it behave when operated locally? I couldn't make out what bandwidth in the lower left tool bar, but was there a strong signal present w/in the selected bandwidth? There is a CW contest going on, but not on 17M. I used to have a contester 1/2 mile
away and I was right smack in his beam path. I could hear his products on every band I listened on, WARC bands as well!
73 Kriss KA1GJU
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