Hi!
Me too!
I like Janus/Ozy with SDR-1000. Should we just skip over versions
1.18.1 and upwards until version 1.20 release arrives?
Ahti OH2RZ
2009/6/22 keega...@juno.com keega...@juno.com:
Hello,
I also agree with Joe and Ronald. I to use the Janus/Ozy sound card.
1.18.0 works fine
Hi Phil and Bob,
2009/3/18 Phil Harman p...@pharman.org:
Hi Bob,
Just tried the latest test code. A HUGE improvement in the AGC performance -
sounds just great - many thanks.
Now, about the speech compressor.. :)
... or clipper?! See these interesting measurements of K3:
Thank you Lee for bringing up this valuable feature of the Flex and
other SDR equipment. Proper use of compression (or clipping) together
with equalizers and filters makes high power amplifiers unnecessary in
many cases. Try this concept and you'll find that you can manage in DX
pileups with much
extreme swr sensitivity or possibly parasitics I can guess at the
causes but I do not know what the logical troubleshooting procedure would
be.
-Pete
-Original Message-
From: Ahti Aintila [EMAIL PROTECTED]
Sent: Dec 9, 2008 11:54 PM
To: Dudley Hurry [EMAIL PROTECTED]
Cc: Pete Ferrand
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Pete Ferrand
Sent: Wednesday, December 10, 2008 4:16 AM
To: Ahti Aintila
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] blown SDR-1000 final opamp
Ahti:
Thank you for taking the time to reply. My
Pete,
The very old SDR-1000 units have OPA2677 as the final amplifier and
cannot stand short circuit. The newer radios use OPA2674 that has
internal short circuit protection. Anyhow, ask Flex people directly,
they know better the difficulties with some of the first production
units.
73, Ahti
no mention of it in
the archives I suppose that hasn't happened.
73,
-Pete
WB2QLL
Somers, WI
-Original Message-
From: Ahti Aintila [EMAIL PROTECTED]
Sent: Dec 9, 2008 4:54 AM
To: Pete Ferrand [EMAIL PROTECTED]
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] blown SDR-1000
David,
If you are using any UPS equipment or any other switched mode power
supplies, try to switch them off.
Ahti OH2RZ
On 29/11/2008, David Beumer W0DHB [EMAIL PROTECTED] wrote:
Folks
I'm trying to track down the source of some nasty QRM that appears as an
4khz wide carrier that meanders
On 01/07/2008, Ray, K9DUR [EMAIL PROTECTED] wrote:
Version 1.1 of my voice keyer program is now available for download from my
web site:
http://www/qsl.net/k9dur/downloads.htm
Hi Ray,
Thank you for the useful info. This is the correct URL:
http://www.qsl.net/k9dur/downloads.htm
73,
On 26/06/2008, Jim Lux [EMAIL PROTECTED] wrote:
The key words when working with relays are debouncing, contact
wetting currents and contamination control of contact materials.
Contrary to the common belief, silver is not the best material for low
voltage contacts (24 V) due to the high
Peter, Tim and All,
My settings for Elecraft K3 TX equalizer are following for high
noise/DX pileup conditions:
50 Hz -16 dB
100 Hz -16 dB
200 Hz -12 dB
400 Hz ±0 dB
800 Hz + 9 dB
1200 Hz +16 dB
2400 Hz +16 dB
3200 Hz -16 dB
After that there is 2,7 kHz roofing filter. The compression
On 6/3/08, Brian C [EMAIL PROTECTED] wrote:
That said, everyone knows wider bandwidths should not be employed on very
crowded amateur bands, nonetheless, the key to intelligibility and
fidelity is b a n d w i d t h.
Hi all,
Actually, IARU recommends max. bandwidth of 2700 Hz on ham bands
On 05/01/2008, Greg - ZL3IX [EMAIL PROTECTED] wrote:
I am still using a very old SVN with my HPSDR, so have not experienced
these recent problems. Personally, I am in favour of using the envelope
tracker, which I believe is implemented in COMP, rather than CPDR. The
envelope tracker seems to
On 26/10/2007, Gerald Capodieci [EMAIL PROTECTED] wrote:
I apologize for being so late with this question or to repeat it again but,
please someone point me to a definition of 11kHz DC noise and what problem
it causes. I'm sure I have the problem too. I just don't recognize it.
Thanks -
Jon,
Take it positively. Isn't it good that you have the excellent digital
filters in your Flex Radio? With the 2.4 kHz SSB filter you can pass
safely your 300 Hz to 2.7 kHz audio modulation to the ionosphere and
rest safe that you don't splatter around with your unnecessarily broad
transmission
Hi Bill,
Great idea to make it a real product! That will have a lot of
customers, I believe, because: a) SDR needs at least one knob, b) I
have three years' successful experience of this concept.
I modified a Logitech USB mouse wheel like this picture shows:
David,
Perhaps a heavy common mode choke at both ends of your USB-to-parallel
cable will help. See:
http://kb.flex-radio.com/article.aspx?id=10273cNode=8F5A7W
73, Ahti OH2RZ
On 06/08/07, David Hilton-Jones [EMAIL PROTECTED] wrote:
I know that this issue has been raised before but would
-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Stig Rasmussen
Sent: Monday, June 04, 2007 1:28 PM
To: Ahti Aintila; Dale Boresz
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] audio punch
Hello, please stop this. :-)
I dont want any discussion around ESSB / and or DX
Stig and Jim,
Dale is telling the plain truth, if your main interest is getting your
signal through in noisy conditions and DX pileups. The basses convey
very little speach information, but eat up the limited power of your
transmitter. Unless you want to broadcast a Hi-Fi music program on ham
On 02/06/07, Jim Lux [EMAIL PROTECTED] wrote:
At 03:15 PM 6/1/2007, k5nwa wrote:
I just had someone that attempted to remove me from the Flex radio
Heh.. happens all the time, apparently (twice for me
recently). Maybe it's worth it for the list manager to look at the
source of the
Hi Greg et al,
FINALLY! Ihave been waiting for 4 years that other flexers start get
interested. As an old hardware man I have been talking about RF
clipping alot. I want to admit that the time of this method is over
already during this SDR era, but that function in the more
sophisticated software
Frank,
I'm no software man, but I suppose that it can be done.
73, Ahti OH2RZ
On 31/05/07, Frank Mayer [EMAIL PROTECTED] wrote:
I am not familiar with the voice shaper. Is this supposed to be
incorporated into the SDR?
- Original Message -
From: Ahti Aintila [EMAIL PROTECTED
Frank,
My best guess is the preamplifier on the RFE-board. Unless the
schematic diagram is not recently updated, there are protection diodes
(1N4148) before the input capacitor (C47) of the amplifier, so maybe
they are broken, too. You possibly can repair it yourself. See these
ECOs for help:
Sorry, my memory made me a trick. The protection diodes are not shown
in the original schematic. They are shown only in the ECO001 and
ECO025.
Please, FlexRadio, update and publish the schematic diagrams of the SDR-1000.
73, Ahti OH2RZ
On 17/05/07, Ahti Aintila [EMAIL PROTECTED] wrote:
Frank
Willi and Frank,
The DC Spark-Over Voltage of SA05-C-T52-A-301-M is specified 200V±20%
and typically the max. device voltage of the preamps is as low as
5-6V. A properly located microgap surge absorber may prevent big
disasters, but still for low voltage transients protective diodes will
be
On 20/04/07, Hulen Smith [EMAIL PROTECTED] wrote:
harder with a measure of safety, it is also very sensitive to low rf levels.
Is there anyone who has figured out a way to completely eliminate this low
level of rf from the SDR-1000 when no modulation is present? It's almost
like a balanced
Cecil,
A convenient on-line calculator for signal level conversions is this:
http://www.analog.com/Analog_Root/static/techSupport/designTools/interactiveTools/dbconvert/dbconvert.html
73, Ahti OH2RZ
On 15/04/07, Sami Aintila [EMAIL PROTECTED] wrote:
Usually for audio applications dBm should be
Dave,
The link works for me, but you may try this:
http://www.analog.com/en/DCDesignToolsDisplay/0,3091,,00.html
;ten go to Audio/Video Products and select dBm/dBu/dBv Calculator.
Good luck, Ahti OH2RZ
On 15/04/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
Original Message
Dana,
it looks to me that you may have a problem with the filter switches
either on the BPF or the RFE boards. Due to bit errors and/or
unreliable connections wrong filter(s) get selected. That has happened
to me.
73, Ahti OH2RZ
On 03/03/07, N1OFZ [EMAIL PROTECTED] wrote:
When we calibrated
On 18/02/07, Bill Tracey [EMAIL PROTECTED] wrote:
The basic FFT bin size is 11hz, so for a filter 30 hz or
Bill,
That is a minor difference, but anyhow, I have a question just for
understanding better:
If the sampling frequency is 48 kHz and the number of bins is 4096,
would the bin be
Thank you, Eric and John,
I'm patiently waiting for the better 10-band EQ, but don't hurry. The
highest priority is the MODULAR PowerSDR.
Just wanted to say that the 15-band version was pretty good a couple
of years ago. Also I want to remind why I like a multiband EQ, not
because of the nice
Tim,
Thank you for the excellent articles regarding the optimal voice
settings. As an avid SSB user and supporter and opponent of the double
sideband AM since the mid 50's, I have been wondering why the people
want to waste the scarcest nature's resource of HAM-radio, the
electromagnetic
Krister and Willy,
I totally agree with your opinions otherwise, but the copy or clone
should always in ALL respects be an improvement over the original
design. That the German copy is not. Obviously the worst mistake Mr.
Dipl.-Ing. H.-J. Kneisner made is that he did not know or understand
that
Eric and the whole Software Team,
Thank you for the great v. 1.8.0. Nothing to complain - and that's
something that I usually don't do. Just a question this time:
I followed the recommendation of Eric and Bob and let the PowerSDR
build the mdb-file instead of transferring my previous one. I
On 23/12/06, Robert McGwier [EMAIL PROTECTED] wrote:
final filter design. It is my opinion that the Blackman-Harris filter
design is optimal for our needs.
Bob,
Thank you. I have the same opinion, but wanted to be sure. I will
change back to Blackman-Harris.
Xmas!
Ahti OH2RZ
The updated BandText table is contained in a small MS Access database
and must be copied or exported to your working PowerSDR database
(powersdr.mdb).
This file has been supplied courtesy of Ahti, OH2RZ
___
FlexRadio mailing list
Hi Flexers,
Has anybody Access, time and interest for making a downloadable
general purpose (or even personalized) mdb-file with IARU Region 1
frequency allocations?
73, Ahti OH2RZ
___
FlexRadio mailing list
FlexRadio@flex-radio.biz
On 17/12/06, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
Question about RF pre-amplifier
Arial [0 or -10dB] [RF preamp] [mixer] [amplifier X dB or X+Y dB]
Soundcard
Peter,
That is almost right. The RF preamp is always on, but [amplifier X dB or Y dB].
73, Ahti OH2RZ
Gordon and other Flexers,
Thanks a lot. I received the BandText table from Bodo, DJ9CS, and
found an unused ACCESS in my office computer. Now the new PowerSDR.mdb
works already.
Maybe, Tim or Bodo are going to upload the table to the Knowledge
Base. However, I think that PowerSDR installation
On 18/12/06, Marzan, Edwin [EMAIL PROTECTED] wrote:
Greetings,
Could one just delete the existing table and replace it with the new table?
If that is the case I'll try it on my own system and if it works I'll be
willing to do the swap for others as well.
That's it how I did it. Using MS
Schematics and ECOs found by using Knowledge Base search.
Why to make it so difficult? I could not even use the same user name
that I earlier registered for Forum.
Ahti OH2RZ
On 07/11/06, Ahti Aintila [EMAIL PROTECTED] wrote:
Eric,
I miss the schematics and all ECOs. Why not put them
Eric,
I miss the schematics and all ECOs. Why not put them downloadable as
they were earlier? Actually, the schematic diagrams should be updated
to reflect the present situation with all the ECOs included. At the
same time the resolution should be increased so that the component
values and finer
Are we already addicted to the Flexradio reflector?
Ahti OH2RZ
On 01/11/06, Tom Thompson [EMAIL PROTECTED] wrote:
Jim Lux wrote:
Just a test..
Jim, W6RMK
James Lux, P.E.
Spacecraft Radio Frequency Subsystems Group
Flight Communications Systems Section
Jet Propulsion Laboratory, Mail
On 16/10/06, Jim, W4ATK [EMAIL PROTECTED] wrote:
RFI elimination
is trial and error.
73 Jim, W4ATK
Yes, Jim, so it is!
In my case one common mode choke was not enough. I tried two cokes
first at the radio end and then at the computer end. The best result
was with one choke at both ends. It
Ferrite can help in the case of common mode interference problems. I
am using several turns of USB cable wound in double E-core ferrite
(Grade N27) at BOTH ends of the cable.
http://kotisivu.dnainternet.net/ahti/sdr-1000/USBfilt.jpg If you
have no E-core, you may use big toroids with several (3-4)
Dan,
Let me comment some statements in this discussion:
On 07/10/06, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
that we have great analog signal meter, I'd like the option to remove the dB
signal level display
Why to hide the absolutely best and most useful display feature of the
whole
On 05/10/06, Wayne Roth [EMAIL PROTECTED] wrote:
Now that we have great analog signal meter, I'd like the option to remove the
dB signal level display
Why to hide the absolutely best and most useful display feature of the
whole SDR-1000?! I need dBm for my measurements.
73, Ahti OH2RZ
Cecil,
Good joke, but don't Shock us. Any silly search machines may connect
us to a wrong group of people due to careless dirty words.
73, Ahti
On 30/09/06, Cecil Bayona [EMAIL PROTECTED] wrote:
Douglas Shock wrote:
Why does my SDR-1000 sound like a ticking watch when powered off? Did I get
Willi,
Thanks for remembering! Linear power supply/voltage regulator is
always a good solution for low noise applications. Unfortunately,
sometimes we cannot use them.
Actually, now I'm using the original chopper with better filtering.
You may add 47uF capacitor parallel to C7 and double the
Hi Tim and Ross,
Let me copy what I answered to Cris and Willi few hours ago:
--
Willi,
Thanks for remembering! Linear power supply/voltage regulator is
always a good solution for low noise applications. Unfortunately,
sometimes we cannot use them.
Actually, now I'm using the original chopper
Larry, Jim, Joe,
Actually, in principle I agree all you said. Nevertheless, let me
express my opinion about the HPSDR project. It is now really overly
complicated and space hungry concept, especially due to that ATLAS
motherboard. However, at this phase of DEVELOPMENT this kind of
solution makes
On 14/09/06, Tim Ellison [EMAIL PROTECTED] wrote:
So anyone have a good recommendation for a stable signal generator that
won't break the bank?
-Tim
Tim,
Why not use Analog Devices evaluation board for AD9952
http://www.analog.com/en/prod/0,,770_843_AD9952%2C00.html? Does
USD250.00 break
On 15/09/06, Kevin Hobbs [EMAIL PROTECTED] wrote:
On
the SDR-1000RFE v1.4 PCB, I found 2 diodes attached to a trace between K14
and C47 . the other end of both diodes go thru the PCB near T2, but they
aren't soldered top or bottom . the PCB bottom solder mask has been scraped
away where the
On 04/09/06, Gerald Capodieci [EMAIL PROTECTED] wrote:
I've found this problem with USB connections. I simply unplug the device and
plug it back in then it usually connects.
Hi Tim, Gerald and all,
That is good advice, but don't forget to check the USB connection on
the set-up window.
Jim,
Thank you very much for your mathematical treatment of the I/Q
balancing matters. That is really the weak point of the otherwise
excellent SDR-1000. To me personally, it means so much that as soon as
I realised this more than about 3 years ago I refused to transmit
before manually correcting
Peter,
To Sami's comment I want add my purist's 0.02 Euro worth:
1/f noise is real, but cannot be easily seen in the present
implementation of the SDR-1000 hardware. As a good designer Gerald has
hidden it by: 1) putting the preamplifier gain so high that the noise
coming from the front end
Another reason for using IF higher than 0 Hz is the high inherent
noise level of typical transistors and opamps at low frequencies (so
called 1/f-noise). This and the leakage of the VFO signals made me to
move away from the zero-IF in my early switching (and Tayloe) mixer
experiments.
Typo correction: ... article in QEX...
Ahti OH2RZ
On 21/05/06, Ahti Aintila [EMAIL PROTECTED] wrote:
Another reason for using IF higher than 0 Hz is the high inherent
noise level of typical transistors and opamps at low frequencies (so
called 1/f-noise). This and the leakage of the VFO
Peter,
You are right about the 22 kHz image in transmission. That is why I am
reluctant to transmit without checking (and adjusting) the attenuation
on the used frequency.
With the preamplifier board the leakage of the sampling signal still
can be detected by my other receivers. In practice it
Thanks to everybody for the most interesting and educating discussion.
Nevertheless, I am not happy until the JANUS version with AK5394A is
in my hands and I have modified the QSD and the following amplifier.
Best regards and special thanks to the HPSDR group for the good work
done so far,
Ahti
Tim,
This sounds like interference coming from the 12 V to +/-15 V DC to DC
converter (NMA1215S) on the PIO board. I have added some extra
filtering, but still sometimes can see and hear it wandering across
the panadapter window at a level -155 dBm. Naturally, that low level
can be seen only
Bill,
You are right, at least partially. There is a big risk of tin whiskers
shorting the narrow gaps between the fine pitch lead-free solder
joints, unless the manufacturers know exactly their materials and can
strictly control the process.
There are positive examples since several years when
Bill,
If the normal clamp-on chokes don't help, you may use double ferrite
E-cores, wind several turns of cable and close together with ahdesive
tape. See this:
http://kotisivu.dnainternet.net/ahti/sdr-1000/USBfilt.jpg. This
trick works well with my USB-to-PIO adapter proto.
Larrys advice may
Is this a bug or a new feature? The Level Calibration of the preview
18 with -70 dBm signal gives me following signal levels on the
Spectrum display with different preamp gains:
Off: -70 dBm
Low: -80 dBm
Med: -70 dBm
High: -80 dBm
If I transfer the mdb-file from the version 1.4.5.16, all gain
Gerald and Paul,
I don't have the DUBUS article around. How exactly is the compression
done in SDR-1000? According to my understanding the compression will
increase the INBAND intermodulation distortion, unless the audio
spectrum is sliced to narrow subbands that are individually compressed
Dale,
This 60 ohms to ground most probably indicates a hardware fault. The
parallel interface cannot drive that low impedance to the logical 1
level.
Earlier, before I changed away from the parallel cable to USB
connection, I had difficulties that I corrected by soldering a 3.3 kohm
are worth reading:
http://kotisivu.dnainternet.net/ahti/sdr-1000/speechproc.pdf
http://kotisivu.dnainternet.net/ahti/sdr-1000/filtclip.pdf
73, Ahti OH2RZ
- Original Message -
From: Willi Reppel [EMAIL PROTECTED]
To: Ahti Aintila [EMAIL PROTECTED]; FlexRadio@flex-radio.biz
Sent: Monday
The new EQ's are amazing,considering that they are only 3 channels.
Behringer could take a lesson for their vx2000 processor.
Bill Nagle
[EMAIL PROTECTED]
More TX equalizer channels needed for the optimal noise penetrating
communications quality! Our HF DX-bands are not the best place for
Hi Larry,
Due to the failure of the parallel port data communication you may get a
wrong relay or semiconductor switch - and correspondingly some wrong
filter - to pass your signal. That would explain the attenuation. My
recommendation is the USB to parallel adapter.
Happy new year and 73,
The SSB modulation came to the telecommunication in the purpose of
saving frequency spectrum and reducing transmitting power without
sacrificing the signal intelligibility. It seems to me that during the
years and decades the knowledge of processing the signal for optimal
communication grade
Hi all, audiophiles included (like myself),
Just wanted to remind that any HF equipment doesn't deserve to be called
SSB transceiver if it has no equalization of the transmitted signal. It
is extremely important in SSB DX work when you want to get through the
QRM and other noise. As Bob let
Bob,
With the changes in Preview 8 the good RX of the SDR-1000 is
now GREAT! My system is: Pentium 4, 3.2 GHz, 1024 MB DDR, XP
Pro SP2, Radeon 9550 256 MB, w/RFE, Waveterminal 192X, WDM-KS,
USB-to-PIO.
The CPU loadings are:
- Display off 3.9%
- Spectrum 5 FPS 4.7%
- Spectrum 15 FPS 6.3%
Well
Larry wants to use separate receivers and transmitters -
possible different antennas for the receiver and transmitter.
In this situation for protecting the receiver, it must be
completely isolated from the antenna during the transmitting
time by a good antenna relay, PIN diode switch or high
Website is now OK, but where is Forum?
73, Ahti OH2RZ
Hi Dan,
I was wondering the same specification of the PreSonus Firebox, but did not
ask them. Thanks for doing that.
Obviously Firebox has better dynamic range than Delta 44 (higher max level,
lower noise?). However, the best specifications I have seen is with AKM chip
set as given in your
Hi Willi (et al),
Correction to your message: HP's RPN calculators are from the past
millennium.
Ahti OH2RZ
- Original Message -
From: Willi Reppel [EMAIL PROTECTED]
Sent: Saturday, November 05, 2005 11:43 PM
RPN was already used on HP´s desktop calculators in the sixties of the
I can confirm Eric's statement. One of our three SDR-1000 systems had this
problem. Cooling down the AD9854 helped temporarily. Then I installed a
bigger heatsink that worked a couple of weeks until the synthesizer got
damaged so badly that it did not work any more with any version of the
that it was the
failure of AD9854. Unfortunately I have no possibilities of etching the
package open for microscopic inspection of the bare die.
73, Ahti OH2RZ
- Original Message -
From: Jim Lux [EMAIL PROTECTED]
To: Ahti Aintila [EMAIL PROTECTED]; [EMAIL PROTECTED];
FlexRadio@flex
-
From: Lyle Johnson [EMAIL PROTECTED]
To: Ahti Aintila [EMAIL PROTECTED]
Cc: Tayloe Dan-P26412 [EMAIL PROTECTED];
FlexRadio@flex-radio.biz
Sent: Sunday, September 25, 2005 11:54 PM
Subject: Re: [Flexradio] Audiocards, USB, etc.
Hello Ahti!
In my previous message the input signal specification
PROTECTED]; Ahti Aintila [EMAIL PROTECTED];
FlexRadio@flex-radio.biz
Sent: Saturday, September 24, 2005 6:20 AM
Subject: Re: [Flexradio] Audiocards, USB, etc.
At 05:40 PM 9/23/2005, Tayloe Dan-P26412 wrote:
I would think that on top of the audio blocking test we also want to
run audio IP3 tests
Hi Riho and Bob,
If I am not mistaken, the dynamic range of the loopback measurement in this
case may be limited by the DAC that happens to have noise about -106 dBA.
Another limiting factor is the maximum signal before clipping.
The important parameters for our SDR-1000 receivers are the
I have same kind of problems since the early versions of PowerSDR. In my
case the system may hang already when starting the program. Usually the CPU
loading goes up above 50% before I click STANDBY to ON. If at this phase
I can use the Task Manager. If clicking ON, the CPU loading goes to 100%
No MOX problem after having 3.3 kohm connected between X2-14 and X2-11.
73 de Ahti OH2RZ
- Original Message -
From: Eric [EMAIL PROTECTED]
To: 'FlexRadio - Eric' [EMAIL PROTECTED]; 'Mike King - KM0T'
[EMAIL PROTECTED]; FlexRadio@flex-radio.biz
Sent: Friday, July 22, 2005 6:00 PM
Wally and all,
Since receiving the SDR-1000 in July 2003 I am fighting the RFI, spurious,
noise and common mode issues and no final and universal solution yet! So far
I try to manage with isolating transformers in I/Q lines (input and output),
ferrite beads in parallel cable as well as the USB
84 matches
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