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
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"Ham Radio Open Conversation"
Yahoo group owner/moderator
- Reply message -
From: "Steve Sterling"
To:
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 post, but see here y
message -
From: "Ross Stenberg"
To:
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 me
t;Ham Radio Open Conversation"
Yahoo group owner/moderator
- Reply message -
From: "Ross Stenberg"
To:
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
Could possibly be calibration. Try restoring default settings,
disconnecting all antennas and pressing Ctrl+Shift+P to bring up the
calibration program. Run all standard tests which will take about 15
minutes to recalibrate your radio on all bands.
If that doesn't do it you probably have a loc
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.
Jupiter with a spectrum analyzer would be
helpful.
73,
Robert
KB6QXM
"Ham Radio Open Conversation"
Yahoo group owner/moderator
- Reply message -
From: "Brian Lloyd"
To: "Robert Costa, KB6QXM"
Cc: "flexradio@flex-radio.biz"
Subject: [Flexrad
On Sun, Jan 6, 2013 at 7:39 PM, Robert Costa, KB6QXM wrote:
> 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.
--
Brian Llo
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
_
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 cl
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:
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 wit
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. Usuall
On Sat, Jun 9, 2012 at 8:39 AM, Gary Franklin 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 power up PSDR a
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 seconds
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
On Sat, Jan 16, 2010 at 8:10 AM, k5nwa 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 falls into the
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 ch
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 width
I re-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 t
...
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: [Flexra
(a)amsat.org .
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
- any
>repetitive waveform), and are in error, fundamentally,
>for noise. When you turn on the "noise marker", the
>instrument makes additional calculations to make the
>readings accurate for random noise.
>
>When you get down to the nitty-gritty of noise, it's
>
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 E
ECTED]
[mailto:[EMAIL PROTECTED] On Behalf 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
. When you turn on the "noise marker", the
instrument makes additional calculations 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
; anyway. running in average mode almost all the time.
>
> Jim - W4YXU
> - Original Message -
> From: "Eric Wachsmann" <[EMAIL PROTECTED]>
> To: "'Tim Ellison'" <[EMAIL PROTECTED]>; "'Doug McCormack'"
> <[E
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.
>
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 definitel
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 r
AIL PROTECTED]>
To: "'Tim Ellison'" <[EMAIL PROTECTED]>; "'Doug McCormack'"
<[EMAIL PROTECTED]>;
Sent: Thursday, June 14, 2007 11:04 AM
Subject: Re: [Flexradio] Noise Floor S meter vs Panadapter
> This is close, but technically, a bit
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 distribut
PROTECTED] [mailto:[EMAIL 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 Panadap
PROTECTED]
[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
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 to
i would terminate the antenna connection into a 50 ohm load to measure
noise.
phil AB2JL
- Original Message -
From: "Doug McCormack" <[EMAIL PROTECTED]>
To:
Sent: Thursday, June 14, 2007 11:29 AM
Subject: [Flexradio] Noise Floor S meter vs Panadapter
>I recently
@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 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
___
Van: 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 preampli
sired "quiet" receiver, or
are we talking about two different ideas?
Craig, KC2LFI
- Original Message -
From: "Tayloe Dan-P26412" <[EMAIL PROTECTED]>
To:
Sent: Sunday, January 21, 2007 3:54 PM
Subject: [Flexradio] Noise floor driven, threshold based AGC?
>
PROTECTED]
> Sent: Sunday, January 21, 2007 3:35 PM
> 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
ex-radio.biz
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 (b
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 st
- 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
>
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 sig
lto:[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]
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
Wachsmann'; 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
adio@flex-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
the SVN version, on both versions I had 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,
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 the
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 sound
TECTED]
> radio.biz] 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
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 ow
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
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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