Probably an old portable
AM radio would work as well finding those 8 or 15kHz multi-
harmonic signals.
If you haven't got an old AM radio get yourself one of these
http://www.winradio.com/home/erd.htm
I've had one for years, its easy to use and excellent for tracking down rfi
problems. Anyone
My new Flex-3000 ... getting to know it ... very nice.
I am, however, seeing spurs every 8 KHz coming from an external source, I
believe, since disappears with dummy load. Any thoughts about what might be
candidates for an 8 KHz spacing?
Thanks!
A soundcard? Many digital mode programs run the soundcard at 8kHz.
Simon Brown, HB9DRV
www.ham-radio-deluxe.com
- Original Message -
From: Sanger, Joseph joseph.san...@nyumc.org
I am, however, seeing spurs every 8 KHz coming from an external
source, I believe, since disappears
: Re: [Flexradio] Spurs Every 8 KHz
A soundcard? Many digital mode programs run the soundcard at 8kHz.
Simon Brown, HB9DRV
www.ham-radio-deluxe.com
- Original Message -
From: Sanger, Joseph joseph.san...@nyumc.org
I am, however, seeing spurs every 8 KHz coming from an external
.
-Original Message-
From: flexradio-boun...@flex-radio.biz
[mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Simon (HB9DRV)
Sent: Sunday, May 31, 2009 12:35 PM
To: flexradio@flex-radio.biz
Subject: Re: [Flexradio] Spurs Every 8 KHz
A soundcard? Many digital mode programs run the soundcard
, 2009 4:22 PM
To: Sanger, Joseph
Cc: Simon (HB9DRV); flexradio@flex-radio.biz
Subject: Re: [Flexradio] Spurs Every 8 KHz
Joseph,
I have seen Network cards do this, along with wireless routers..Bad
computer powersupplies too and DC supplies. And neighbor's plasma TV.
73,
Dudley
WA5QPZ
Might also want to check into a Power
conditioner or UPS for the computer. I'm not quite sure, but many of
those have a higher degree of power line filtering and could keep conducted
emissions from your computer from getting back into the radio.
You probably don't want the radio PS
At 14:55 5/31/2009, Scott Chrestman wrote:
My Mitsubishi 52 LCD's power supply radiates even when the display is
turned off. Physically unplugging it from the wall is the only way to see
the RFI disappear. Other power supplies, such as for wifi routers and other
wall-warts will also be on and
.
- Original Message -
From: Dudley Hurry jhu...@austin.rr.com
To: Sanger, Joseph joseph.san...@nyumc.org
Cc: flexradio@flex-radio.biz
Sent: Sunday, May 31, 2009 3:21 PM
Subject: Re: [Flexradio] Spurs Every 8 KHz
Joseph,
I have seen Network cards do this, along with wireless routers..Bad
No mention of the Power Supply on the Flex, maybe I missed it. Maybe something
not quite right if you're using a switching power supply, or just about any
power supply from MFJ.
Can you swap to another power supply, or a battery and just not transmit? I
forget the Flex 3000specs, but think
:
From: Sanger, Joseph joseph.san...@nyumc.org
Subject: Re: [Flexradio] Spurs Every 8 KHz
To: Dudley Hurry jhu...@austin.rr.com
Cc: flexradio@flex-radio.biz flexradio@flex-radio.biz
Date: Sunday, May 31, 2009, 4:22 PM
I turned off my lcd tv, wireless
router, and both OTHER computers ... no joy
I have been using the '5K to tune around all the bands just to see
what the noise floor is at my QTH. I discovered that I have some
serious birdies on 15M that tune opposite of the VFO tuning and move
rapidly across the band. I plugged in the dummy load and verified that
the spurs are
The spurs have been virtually eliminated in the Flex 5000
73 W9OY
Need a vacation? Get great deals
to amazing places on Yahoo! Travel.
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: [Flexradio] Spurs in FLEX-5000
The spurs have been virtually eliminated in the Flex 5000
73 W9OY
Need a vacation? Get great deals
to amazing places on Yahoo! Travel.
http://travel.yahoo.com
PM
To: Flexradio
Subject: [Flexradio] Spurs in FLEX-5000
The spurs have been virtually eliminated in the Flex 5000
73 W9OY
Yes, it is tremendously improved but I cannot recommended Tim's
operational mode. The reasons for this are it still improves the tiny
spurs but more so
I have seen comments recently about spurs in the 20m band with the SDR-1000,
and I have also seen comments that spur performance is much improved in the
FLEX-5000. Can anyone describe the changes made in the FLEX-5000 design to
improve the spur performance?
Thanks,
Bill, K5EMI
I just ran across a strange artifact that is present in both v1.10.1 in
SVN 1503.
I was on 20m USB. While tuning up in frequency in 100Hz steps, when I
stepped from 14.293.8 to 14.293.9, a series of spurs appeared all the way
across the panadpter display. When I continued tuning up in
Yes, I have observed the same thing.
Jim, W4ATK
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Ray Andrews, K9DUR
Sent: Saturday, September 01, 2007 9:12 AM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] Spurs on 20m
I just ran across a strange
Of Ray Andrews, K9DUR
Sent: Saturday, September 01, 2007 9:12 AM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] Spurs on 20m
I just ran across a strange artifact that is present in both v1.10.1 in
SVN 1503.
I was on 20m USB. While tuning up in frequency in 100Hz steps, when I
stepped from
: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Spurs on 20m
Same to me, reported a long time ago ... .
Guys who are using Powersdr FA66(@96kHz) , don't you see a noise floor drop
(more than 5dB) on bottom and top end of the spectrum ? . The spectrum looks
like a curving with its max at the middle
Yes. I see spurs from 14.291.5 to 14.297.
Using a SDR-1000 with Delta 44.
Bob
K8MLM
In a message dated 9/1/2007 10:12:29 A.M. Eastern Daylight Time,
[EMAIL PROTECTED] writes:
I just ran across a strange artifact that is present in both v1.10.1 in
SVN 1503.
I was on 20m USB.
PM
To: John Hansen
Cc: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Spurs on 20m
Same to me, reported a long time ago ... .
Guys who are using Powersdr FA66(@96kHz) , don't you see a noise floor
drop (more than 5dB) on bottom and top end of the spectrum ? . The spectrum
looks like
I have noticed this with the sdr1000 since I received it, july06 it is
like a strange mixing or something like that..
I figured it was normal...I have run across it on different bands
some screen captures of lower end of 6 meters.
http://www.w9ray.org/sdr/spurs.htm
I noticed this with both
.
- Jeff, K6JCA
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Ray J
Sent: Saturday, September 01, 2007 3:02 PM
To: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Spurs on 20m
I have noticed this with the sdr1000 since I received it, july06 it is
like
I think it must be repairable because version 1.6.2 of the code doesn't
have them... at least not the ones around 14.3 MHz on 20 meters. It does
seem to me that it's a pretty serious problem.
John W2FS
Ray J wrote:
I have noticed this with the sdr1000 since I received it, july06 it is
like a
: [Flexradio] Spurs on 20m
I think it must be repairable because version 1.6.2 of the code doesn't
have them... at least not the ones around 14.3 MHz on 20 meters. It does
seem to me that it's a pretty serious problem.
John W2FS
Ray J wrote:
I have noticed this with the sdr1000 since I received
Tim,
You wrote, The previous version used a different IF of 11025 Hz and the new
versions are using 9000 Hz.
I used the IF frequency setting in the DDS box under Setup/General/Hardware
Config (v1.10.1) to change the IF frequency back to 11025 Hz. Either this
control doesn't really change the IF
I have noticed on 17 meters with my SDR-1000 that on 17 meters when the radio
is tuned to 18.140 a signal will wander in and out of the receiver passband.
Pretty strong on the dummy load. Is this a receiver spur or other product of
the receiver or could it be the computer power supply/D44
: [Flexradio] Spurs?
I have noticed on 17 meters with my SDR-1000 that on 17 meters when the
radio is tuned to 18.140 a signal will wander in and out of the receiver
passband. Pretty strong on the dummy load. Is this a receiver spur or
other product of the receiver or could it be the computer
:25 PM
Subject: RE: [Flexradio] Spurs?
If you turn on and off Spur Reduction does it move?
Is it a hump or a spike?
-Tim
Integrated Technical Services
www.itsco.com
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Frank Mayer
I notice that with spur reduction checked there is a monster spur at
28.588 488 and a while below.
This beast goes away at 28.588 489 and above, OR if spur reduction is
unchecked.
On my machine 10M seems pretty full of spurs and spur reduction just
moves them out of the way!
Should I be
]
[mailto:[EMAIL PROTECTED] On Behalf Of Jim McLester
Sent: Friday, April 20, 2007 11:02 AM
To: flexradio@flex-radio.biz
Subject: [Flexradio] spurs
I notice that with spur reduction checked there is a monster spur at
28.588 488 and a while below.
This beast goes away at 28.588 489 and above, OR if spur
PROTECTED]
To: FlexRadio@flex-radio.biz
Sent: Tuesday, August 15, 2006 6:59 AM
Subject: Re: [Flexradio] Spurs and Picket Fences
Did you guys have Spur Reduction checked?
I went across the entire 10 meter band just now and had only 1 spot with a
spur.
I was in upper sideband running a bandwidth of 4
Well, with the current spurs discussion going on, a few have emailed me
directly to ask how I have been dealing with the spurs...so here goes...
I think as Bob mentioned, the bandscope is our best friend and worst
enemy...due to the spurswell I guess I have worked with my SDRs enough
to
I have also experienced this spurious situation. I have a few questions.
I am shopping for a GPS disciplined 10 MHz reference oscillator. I have a
good Symmetricom 58532A antenna. Waiting for the right receiver. Will the
use of this device cut down on the spurs?
I'm also planning to have the
FlexRadio Systems
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
radio.biz] On Behalf Of Mike King - KM0T
Sent: Wednesday, August 16, 2006 9:01 AM
To: 'FlexRadio Mailing List'
Subject: [Flexradio] Spurs at KM0T
--snip--
As and example, when tuned to 144.200
Mike,
What is the location for the Delta-44 mods by KC7KW. I found several
sites about Andy and his prolific setup
but the Delta-44 eludes me.
73, Larry K2LT
Mike Monnier wrote:
I have also experienced this spurious situation. I have a few questions.
I am shopping for a GPS disciplined 10
At 07:07 AM 8/16/2006, Mike Monnier wrote:
I have also experienced this spurious situation. I have a few questions.
I am shopping for a GPS disciplined 10 MHz reference oscillator. I have a
good Symmetricom 58532A antenna. Waiting for the right receiver. Will the
use of this device cut down on
Thanks Mike for the leads. Ken, N9VV posted on 7/23/06.
There was discussion several months ago on Teamspeak about the SM5BSZ
mods to the Delta 44. His work was done on an earlier version of the
D44. The conclusion was that similar changes were incorporated by M
Audio in later versions of
Did you guys have Spur Reduction checked?
I went across the entire 10 meter band just now and had only 1 spot with a
spur.
I was in upper sideband running a bandwidth of 4 khz and the spur was in my
passband at 28.583 ,584 and 585.
The Signal level was -87.3 dBm. Nothing in the entire band other
Yes. The issue with PowerSDR is that you can see tiny spurs that you
cannot hear in a normal radio. Furthermore, because the audio output
of most transceivers has about 50 dB dynamic range at most, you will
not see the spurs in the audio output even if you hook up a good
Spectrum program
The spurs you see are real. They are DDS spurs for the most part. The
traveling hump is due to the switching power supplies providing the
rails on the INA's.
The DDS spurs can and should be avoided. We can mathematically derive
where they will be and then we can avoid them. It is yet
In my case, turning spur reduction seems to make it worse, the spurs are -50dB
or even higher, it's totally useless on 10 meters.
On Tuesday 15 August 2006 06:59, Jimmy Jones wrote:
Did you guys have Spur Reduction checked?
I went across the entire 10 meter band just now and had only 1 spot
- Original Message -
From: Cecil Bayona [EMAIL PROTECTED]
To: flexradio@flex-radio.biz
Sent: Tuesday, August 15, 2006 9:56 AM
Subject: Re: [Flexradio] Spurs and Picket Fences
In my case, turning spur reduction seems to make it worse, the spurs
are -50dB
or even higher, it's totally
M. Lanese [EMAIL PROTECTED]
To: philip gentile [EMAIL PROTECTED]; [EMAIL PROTECTED];
flexradio@flex-radio.biz
Sent: Tuesday, August 15, 2006 11:57 AM
Subject: Re: [Flexradio] Spurs and Picket Fences
Phil
Try designing a pico Amp reading Electrometer and see how much hair PS
noise
eliminates
AM
Subject: Re: [Flexradio] Spurs and Picket Fences
i'm just guessing here, but could all these spurs and fences and such be
caused by power supply noise from the external switching or ripple from
linear power supplies?
if the PSSR of the linear stuff is low enough or the noise high enough
AM
Subject: Re: [Flexradio] Spurs and Picket Fences
The spurs you see are real. They are DDS spurs for the most part. The
traveling hump is due to the switching power supplies providing the
rails on the INA's.
The DDS spurs can and should be avoided. We can mathematically derive
where
I have the same problem here with my SDR1000.
Maarten N1DZ
On Mon, 14 Aug 2006 12:20:59 -0400, Richard Smith [EMAIL PROTECTED]
wrote:
I'm new to the SDR-1000 and have a question about spurs. I've read the
reflector, and understand that right now, spur reduction has more to do
with
I guess the key word here is see. Only in the SDR can you see the
spurs, even if you can't hear them..Most of the spurs I see, are gone
by the time they arrive in my passband. Any radio will have some
spurs, but they only worry about the ones that can be heard. I'm sure that
the SW
I disagree. With my SDR1000 the spurs are real, audible and numerous
within the receivers passband.
Maarten N1DZ
On Mon, 14 Aug 2006 23:53:16 -0400, Dudley Hurry [EMAIL PROTECTED]
wrote:
I guess the key word here is see. Only in the SDR can you see the
spurs, even if you can't hear
, August 14, 2006 9:02 PM
To: Dudley Hurry [EMAIL PROTECTED], FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Spurs and Picket Fences
I disagree. With my SDR1000 the spurs are real, audible and numerous
within the receivers passband.
Maarten N1DZ
As a follow up.
I did a short count of audible birdies on 10m with the SDR1000 receiver
terminated in a dummy load. (BTW 10M is the IF for most of my
transverters.)
A scan from 28.000 to 28.250MHz netted over 40 birdies. These are audible.
I only counted the ones that were 20dB above the noise
]
Date: Tue, 15 Aug 2006 00:36:06
To:FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Spurs and Picket Fences
As a follow up.
I did a short count of audible birdies on 10m with the SDR1000 receiver
terminated in a dummy load. (BTW 10M is the IF for most of my
transverters.)
A scan from 28.000
, December 13, 2005 10:36 AM
To: Gerald Youngblood; FlexRadio@flex-radio.biz
Subject: RE: [Flexradio] Spurs on 10 meters and 6 meters
Gerald, I like the radio and I very much enjoyed meeting you
at Pacificon (I was talking with you when the fire broke
out on Sunday), but your remarks (and those
Of Ross Stenberg
Sent: Monday, December 12, 2005 3:34 PM
To: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Spurs on 10 meters and 6 meters
Sorry. but sometimes it takes a marketing person to bring the
engineers back to reality; does it really matter in the
scheme of normal amateur radio
At 06:49 AM 12/13/2005, Gerald Youngblood wrote:
Ross,
Thanks for bringing some reality back into the discussion. The simple fact
is that the locations of the worst case spurs don't really matter. Those
frequencies are rarely if ever used. Also, most spurs are well below the
atmospheric
stereo coupler.
2. A DC Power cable (6-8 feet?).
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Gerald Youngblood
Sent: Tuesday, December 13, 2005 6:50 AM
To: 'Ross Stenberg'; FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Spurs on 10 meters and 6
. It will be a free download when it does.
73,
Gerald
K5SDR
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bill Tracey
Sent: Sunday, December 11, 2005 5:21 PM
To: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Spurs on 10 meters
How sure
Tim,
Were your screen shots done with spur reduction on or off? With spur
reduction on, I do not get the nine spurs you see on 28.581, I get one big
spur about 5.9 khz above. Spur situation does not change @ 28.582 except
the big spur is now only 4.9 khz above. For my setup with spur
Systems
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
radio.biz] On Behalf Of Bill Tracey
Sent: Sunday, December 11, 2005 5:21 PM
To: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Spurs on 10 meters
How sure are folks that grunge they are seeing and hearing
Sorry. but sometimes it takes a marketing person to bring the engineers back
to reality; does it really matter in the scheme of normal amateur radio
operation if there is a spur at 50.011025 MHz and 28.582454 MHz? Please
accept my sarcasm with the sincerest form of respect :)
73 Ross
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] Spurs on 10 meters
While tuning around 10 meters today I came across the worst case
of spurs I have ever seen on any radio. From 28.580 to 28.585 is
nothing but spurs. Turning off the spur reduction makes it even worse.
This 5khz is not usable
.
- Jeff, WA6AHL
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Stan
Sent: Sunday, December 11, 2005 12:00 AM
To: Tim Ellison
Cc: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Spurs on 10 meters
Theres a very small spur at 28.700 there are a few
Would having a 2nd refence for the DDS chip and being able to select between 200mhz and oh for example161.1328MHzbe a cure for the spurs? The frequency where the spur occurs would shift and surely a PC could do the math to provide the DDS with the proper number to hit the same frequency.
-- If you
Yes.
Bob
N4HY
David Queen wrote:
Would having a 2nd refence for the DDS chip and being able to select
between 200mhz and oh for example
161.1328MHz be a cure for the spurs? The frequency where the spur
occurs would shift and surely a PC could do the math to provide the
DDS with the
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] Spurs on 10
meters etc
Would having a 2nd refence for the DDS chip and being able to select
between 200mhz and oh for example
161.1328MHz
be a cure for the spurs? The frequency where
the spur occurs would shift and surely a PC
How sure are folks that grunge they are seeing and hearing at 28.500 MHz
and thereabouts are DDS spurs? I did a little playing with this with
different DDS frequencies and listening with another radio to the same
frequency and have a feeling I'm hearing my computer. What I'm hearing is
.
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Bill Tracey
Sent: Sunday, December 11, 2005 3:21 PM
To: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Spurs on 10 meters
How sure are folks that grunge they are seeing and hearing at 28.500 MHz
While tuning around 10 meters today I came across the worst case
of spurs I have ever seen on any radio. From 28.580 to 28.585 is
nothing but spurs. Turning off the spur reduction makes it even worse.
This 5khz is not usable for me. Its totally destroyed by the spurs.
Anyone else seeing this or
Same here, Stan. I'm sure it's not your specific system. Gary AI4IN
-- Original message --
From: Stan [EMAIL PROTECTED]
While tuning around 10 meters today I came across the worst case
of spurs I have ever seen on any radio. From 28.580 to 28.585 is
nothing
PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Stan
Sent: Saturday, December 10, 2005 9:02 PM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] Spurs on 10 meters
While tuning around 10 meters today I came across the worst case
of spurs I have ever seen on any radio. From 28.580 to 28.585 is
nothing
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