Check to make sure the preamp is turned on for 15 meters. If it is off the
noise floor will rise by the gain of the preamp on that band...about 15 db.
Don K7MX
___
FlexRadio Systems Mailing List
FlexRadio@flex-radio.biz
Subject: [Flexradio] Noise floor on 15 meters 20 db above all other bands
Date: Sun, Jan 6, 2013 10:55 pm
On Sun, Jan 6, 2013 at 7:39 PM, Robert Costa, KB6QXM kb6...@yahoo.com wrote:
All,
On my 5000a, I compare my noise floor on 15 meters compared with all other
bands. The15 meters noise floor
http://www.radiosky.com/rjcentral.html
On my 5000a, I compare my noise floor on 15 meters compared with all
other bands. The15 meters noise floor is about 20 db higher than all
other bands. Any clues? Calibration issue?
It is probably Jupiter.
Radio Open Conversation
Yahoo group owner/moderator
- Reply message -
From: Ross Stenberg ross.stenb...@charter.net
To: flexradio@flex-radio.biz
Subject: [Flexradio] Noise floor on 15 meters 20 db above all other bands
Date: Mon, Jan 7, 2013 8:20 am
http://www.radiosky.com/rjcentral.html
...@charter.net
To: flexradio@flex-radio.biz
Subject: [Flexradio] Noise floor on 15 meters 20 db above all other bands
Date: Mon, Jan 7, 2013 8:20 am
http://www.radiosky.com/rjcentral.html
On my 5000a, I compare my noise floor on 15 meters compared with all
other bands. The15 meters noise floor
Radio Open Conversation
Yahoo group owner/moderator
- Reply message -
From: Steve Sterling f...@sgsterling.com
To: flexradio@flex-radio.biz
Subject: [Flexradio] Noise floor on 15 meters 20 db above all other bands
Date: Mon, Jan 7, 2013 12:47 pm
I was about to comment on your original
All,
On my 5000a, I compare my noise floor on 15 meters compared with all other
bands. The15 meters noise floor is about 20 db higher than all other bands. Any
clues? Calibration issue?
Any ideas?
73,
Robert
KB6QXM
Ham Radio Open Conversation
Yahoo group owner/moderator
On Sun, Jan 6, 2013 at 7:39 PM, Robert Costa, KB6QXM kb6...@yahoo.comwrote:
All,
On my 5000a, I compare my noise floor on 15 meters compared with all other
bands. The15 meters noise floor is about 20 db higher than all other bands.
Any clues? Calibration issue?
It is probably Jupiter.
--
I received many responses to my inquiry and would like to thank all
those who responded! It turned out to be a Calibration issue. After
running the calibration routine the noice floor dropped to normal
levels about -115 dbm.
Gary,K8BKB
I have received many suggestions and have
I have setup a Flex 3000 for my Dad recently. The ambient noise floor
seems to be very high. With no antenna connected it shows a -73 dbm on
the S meter. What might explain that??
Also often, but not always when I power up PSDR and turn the start
button on I get no audio for a few
On Sat, Jun 9, 2012 at 8:39 AM, Gary Franklin franklin6...@att.net wrote:
I have setup a Flex 3000 for my Dad recently. The ambient noise floor
seems to be very high. With no antenna connected it shows a -73 dbm on
the S meter. What might explain that??
Also often, but not always when I
When your radio goes into convulsions as you say, what is happening is that
you have too many
windows applications running in the background competing with PowerSDR. Go to
control
panel - device manager - adapters, and right click on each adapter and DONT
DELETE THEM, but
disable them. Usually
This can also be caused by excessive DPC (Deferred Process Calls). I had
a similar problem when I first got my Flex-3000 and for me the main
culprit turned out to be the real time protection in Malwarebytes. After
disabling real time protection my problem was solved. I still do a daily
scan
I have received many suggestions and have cleared up a couple of the
issues below! But no one has commented on the high noise floor .
-73 dbm with no antenna attached! seems out of wack to me . any
suggestions?
Thanks
Gary, K8BKB
Original Message
Subject:
I have noticed the same thing with the latest version. Sometimes a signal
elsewhere In the band moves the whole noise floor. Had not noticed it in
previous versions. May have to go back a version myself.
Bob K6DDS
iPhone
___
FlexRadio Systems Mailing
At 02:54 PM 1/21/2007, Tayloe Dan-P26412 wrote:
I was listening to a homebrew SDR receiver last night and it stuck me
how noisy it was compared to my analog, narrow band NC2030. As I
thought about this for a bit, I think the reason that the NC2030 is so
quiet (besides close attention of audio
On Sat, Jan 16, 2010 at 8:10 AM, k5nwa k5...@sbcglobal.net wrote:
At 02:54 PM 1/21/2007, Tayloe Dan-P26412 wrote:
Suppose the receiver does an average noise level calculation over the
sampled bandwidth (min function?) and then set an AGC threshold above
that point (10 db?). If the signal
I am a weak signal 6 meter operator using an SDR5000. I have noticed that if I
set the Sample Rate to 48K (under the Audio Tab) rather than 96K, my noise
floor drops 1 dB or so. I am not sure if there is any signal to noise net
advantage. All other settings being kept the same. (i.e filter
...
I'll see if I can find my report and send you a link to see if we're seeing
the same thing.
Mark
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Doug McCormack
Sent: Thursday, June 14, 2007 11:30 AM
To: flexradio@flex-radio.biz
Subject: [Flexradio] Noise
-calibrate the receiver.)
Mark
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Mark Amos
Sent: Tuesday, June 19, 2007 9:29 PM
To: 'Doug McCormack'; flexradio@flex-radio.biz
Subject: Re: [Flexradio] Noise Floor S meter vs Panadapter
Doug,
I had the same problem
you get down to the nitty-gritty of noise, it's
not at all a simple subject.
73,
Dave W8NF
From: Doug McCormack [EMAIL PROTECTED]
Subject: Re: [Flexradio] Noise Floor S meter vs
Panadapter
Thanks everyone for the quick and detailed
explanation. I now understand
the S meter displays one
.
Van: [EMAIL PROTECTED] namens Charles Greene
Verzonden: za 16-6-2007 13:55
Aan: Dave Haupt; flexradio@flex-radio.biz
Onderwerp: Re: [Flexradio] Noise floor, specifying
David,
I'm not a practicing engineer, but I always thought Noise
power=10*log BW. So the noise power in a 10hz filter was 10
- Original Message -
From: Eric Wachsmann [EMAIL PROTECTED]
To: 'Tim Ellison' [EMAIL PROTECTED]; 'Doug McCormack'
[EMAIL PROTECTED]; flexradio@flex-radio.biz
Sent: Thursday, June 14, 2007 11:04 AM
Subject: Re: [Flexradio] Noise Floor S meter vs Panadapter
This is close
to make the
readings accurate for random noise.
When you get down to the nitty-gritty of noise, it's
not at all a simple subject.
73,
Dave W8NF
From: Doug McCormack [EMAIL PROTECTED]
Subject: Re: [Flexradio] Noise Floor S meter vs
Panadapter
Thanks everyone for the quick and detailed
Of Dave Haupt
Sent: Friday, June 15, 2007 12:05 PM
To: flexradio@flex-radio.biz
Subject: Re: [Flexradio] Noise floor, specifying
You're getting very close to instrumentation norms.
Noise, by its very nature, varies in apparent strength by the bandwidth
in which you measure it. When measuring truly
At 12:05 PM 6/15/2007, Dave Haupt wrote:
You're getting very close to instrumentation norms.
To be accurate, an engineer specifies noise either as
dBm/Hz which means dBm measured in a one Hertz
bandwidth or watts/hz or something like that.
Noise Power Spectral Density or No (as in Eb/No) which
I recently build the Elecraft kit to provide a reference signal for
calibration of my SDR1000. With the 50 uV reference my S meter shows
-73 dBm (S 9.0). At 1 uV reference, the meter shows -107 dBm ( S
3.3). These two numbers show the S meter is perfectly calibrated.
When I remove the Elecraft
@flex-radio.biz
Subject: [Flexradio] Noise Floor S meter vs Panadapter
I recently build the Elecraft kit to provide a reference signal for
calibration of my SDR1000. With the 50 uV reference my S meter shows
-73 dBm (S 9.0). At 1 uV reference, the meter shows -107 dBm ( S
3.3). These two numbers
i would terminate the antenna connection into a 50 ohm load to measure
noise.
phil AB2JL
- Original Message -
From: Doug McCormack [EMAIL PROTECTED]
To: flexradio@flex-radio.biz
Sent: Thursday, June 14, 2007 11:29 AM
Subject: [Flexradio] Noise Floor S meter vs Panadapter
I recently
in a 3.3 KHz
bandwidth.
- Dan, N7VE
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Doug McCormack
Sent: Thursday, June 14, 2007 8:30 AM
To: flexradio@flex-radio.biz
Subject: [Flexradio] Noise Floor S meter vs Panadapter
I recently build the Elecraft kit
]
[mailto:[EMAIL PROTECTED] Behalf Of Philip J Gentile
Sent: Thursday, June 14, 2007 7:54 AM
To: Doug McCormack; flexradio@flex-radio.biz
Subject: Re: [Flexradio] Noise Floor S meter vs Panadapter
i would terminate the antenna connection into a 50 ohm load to measure
noise.
phil AB2JL
- Original
PROTECTED]
radio.biz] On Behalf Of Tim Ellison
Sent: Thursday, June 14, 2007 10:47 AM
To: Doug McCormack; flexradio@flex-radio.biz
Subject: Re: [Flexradio] Noise Floor S meter vs Panadapter
Do you have averaging turned on with the Panadapter? The S meter will
display the highest value it sees
At 08:54 AM 6/14/2007, Philip J Gentile wrote:
i would terminate the antenna connection into a 50 ohm load to measure
noise.
phil AB2JL
When making noise power measurements one has to be aware of the fact
that the instantaneous power can vary quite widely. The noise is a
normally distributed
Ellison' [EMAIL PROTECTED]; 'Doug McCormack'
[EMAIL PROTECTED]; flexradio@flex-radio.biz
Sent: Thursday, June 14, 2007 11:04 AM
Subject: Re: [Flexradio] Noise Floor S meter vs Panadapter
This is close, but technically, a bit different. The multimeter actually
calculates the power within
At 09:00 AM 6/14/2007, Tayloe Dan-P26412 wrote:
What you see on the display and what is on the meter are two different
things. If you are sampling at 48 KHz, what you see on the panadapter
is the noise per 11 Hz bin. What you see on your meter is the noise
from all the 11 Hz bins within the
Doug:
Please ignore all of the erroneous information you have been given.
Everyone is supposed to have read the thousands and thousands of emails
and to have learned everything that was ever said here. You did this right?
;-)
Sorry, I just couldn't resist. Let me explain. This is
Hi Bob,
Forgive me if this is in the manual - What are the attack and decay time
constants on the S meter? Are they adjustable? - I haven't found
anywhere to adjust them.
73, Greg, ZL3IX
Robert McGwier wrote:
Doug:
Please ignore all of the erroneous information you have been given.
I was listening to a homebrew SDR receiver last night and it stuck me
how noisy it was compared to my analog, narrow band NC2030. As I
thought about this for a bit, I think the reason that the NC2030 is so
quiet (besides close attention of audio chain details), is that it has
no AGC. Thus, I can
:[EMAIL PROTECTED] ; pa0pvn(a)hetnet.nl
mailto:[EMAIL PROTECTED] ;
pa0pvn(a)gmail.com ; pa0pvn(a)amsat.org .
Van: [EMAIL PROTECTED] namens Tayloe Dan-P26412
Verzonden: zo 21-1-2007 21:54
Aan: flexradio@flex-radio.biz
Onderwerp: [Flexradio] Noise floor driven
Hi Dan,
The noise-driven AGC is implemented in the Rocky program, its description is
available at (http://www.dxatlas.com/rocky/). The noise floor is estimated
in the frequency domain, as the median of the power spectrum. The median
function is insensitive to the outliers (strong narrowband
- Original Message -
From: Alex, VE3NEA [EMAIL PROTECTED]
The noise-driven, non-inertial AGC is especially useful in the
situations
when the DX operator is working simplex and several strong stations
are
calling him on his frequency, since the weak signals can be heard
between
Hi Guy,
You are right, the non-inertial agc is not a panacea, there are situations
that require a different type of gain control. One good example is
ragchewing: when there is no need to hear weak signals, one may prefer to
have a slow agc that masks the noise completely in the presence of a
Onderwerp: [Flexradio] Noise floor driven, threshold based AGC?
I was listening to a homebrew SDR receiver last night and it stuck me
how noisy it was compared to my analog, narrow band NC2030. As I
thought about this for a bit, I think the reason that the NC2030 is so
quiet (besides close attention
To: Tayloe Dan-P26412; flexradio@flex-radio.biz
Subject: RE: [Flexradio] Noise floor driven, threshold based AGC?
Hi Dan,
I wonder what homebrew this was, and what soundcard was used.
My experience is that the SDR1000 can be very quite when you set the RF
gain.
I like to know what
receiver, or
are we talking about two different ideas?
Craig, KC2LFI
- Original Message -
From: Tayloe Dan-P26412 [EMAIL PROTECTED]
To: flexradio@flex-radio.biz
Sent: Sunday, January 21, 2007 3:54 PM
Subject: [Flexradio] Noise floor driven, threshold based AGC?
I was listening
: Tayloe Dan-P26412 [mailto:[EMAIL PROTECTED]
Verzonden: ma 22-1-2007 3:14
Aan: [EMAIL PROTECTED]; flexradio@flex-radio.biz
Onderwerp: RE: [Flexradio] Noise floor driven, threshold based AGC?
It was nothing special. Just a simple SDR receiver; front end, detector, and
audio preamplifier. I just threw
] On Behalf Of Andy Smith
Sent: Tuesday, September 12, 2006 9:51 AM
To: flexradio@flex-radio.biz
Subject: [Flexradio] Noise Floor Higher - SVN vs 1.6.2
Hi Folks,
Just got my SDR-1000 and only tried RX so far, I notice the noise floor is
around 20-30 dB up the scale using the latest
Hi Folks,
Just got my SDR-1000 and only tried RX so far, I notice the noise floor is
around 20-30 dB up the scale using the latest PowerSDR SVN compared to
1.6.2, is this correct? I have checked all the settings and they look the
same between the two versions. I am using a Firebox for the
to high.
Andy.
G1JVY
-Original Message-
From: Eric Wachsmann [mailto:[EMAIL PROTECTED]
Sent: 12 September 2006 15:55
To: 'Andy Smith'; flexradio@flex-radio.biz
Subject: RE: [Flexradio] Noise Floor Higher - SVN vs 1.6.2
Andy,
Did you import your database or recalibrate the RX Level on the new
the pre-amp set to
high.
Andy.
G1JVY
-Original Message-
From: Eric Wachsmann [mailto:[EMAIL PROTECTED]
Sent: 12 September 2006 15:55
To: 'Andy Smith'; flexradio@flex-radio.biz
Subject: RE: [Flexradio] Noise Floor Higher - SVN vs 1.6.2
Andy,
Did you import your database or recalibrate
-radio.biz
Subject: RE: [Flexradio] Noise Floor Higher - SVN vs 1.6.2
Do the RX Image Rejection and if possible, the Level calibrations.
These are important and I do them every time a version is released that
had modifications to the RX.
The XG-1 or XG-2 from Elecraft is cheap and excellent for doing
'; flexradio@flex-radio.biz
Emne: Re: [Flexradio] Noise Floor Higher - SVN vs 1.6.2
Hi Eric,
I don't have any database so nothing was imported, the SDR is literally just
out of the box, I haven't done any calibration with either version of
software, with 1.6.2 the noise floor sits at around -140dBm against
Dave,
I've observed this kind of behavior as well when using CW. It's been
going on for months and I've been slowly tracking it down. It seems
related to the use of the ATU and may be related to the ATU not finding
a suitable setting for the impedance match in a high SWR condition.
When I
Hi, Dave.
In my event this situation is connected with
external PA and X2 TR Sequencing.
Quality of the Ground TRX and Ext.PA - no problems.
SDR1k 1W + Home Made PA PowerSDR v1.4.5b19
Celeron 2.9GHz, Delta44, WinXP Pro SP2
--
Sergey RW3PS mailto:[EMAIL PROTECTED]
I am a new
I am a new owner as well. I am just setting up for transmitting SSB. I
noticed that sometimes when I key MOX then transmit and then deselect MOX
the receiver noise floor goes down -- I can't hear anything. I have to
restart SDR1K to get it out of this mode. Any ideas?
Thanks
Dave
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