If IT's the SBS I know be perpared to pay big bucks for high quality.Barry Dieser [EMAIL PROTECTED] wrote: I have been out of the loop for awhile, so sorry if this has been posted before. Looks interesting. I am trying to find out the cost.http://www.sbs.com/products/807/-Barry
Alberto, I used the software all day with a single ended input at 5 KHz and 6.4 KHz. Sounds good. The denoise function works best in lo. I like the offset function that can be typed in. FrankAlberto I2PHD [EMAIL PROTECTED] wrote: As I am not ready yet to release my new SDR program, I decided
Ruffino Chainti is my plan for new year's eve with a big batch of meat balls my son andI will make saturday morning. It is supposed to snow so we may not have much company. Plenty of left over sauce for round 2 on Sunday. HNY guysAlberto I2PHD [EMAIL PROTECTED] wrote: Hi Johan, oh no, the
chip. Bob - AE6RV --- FRANCIS CARCIA
[EMAIL PROTECTED] wrote: Bob, I'm planning one myself for an interface to my Racal RA6830 455 KHz IF. I also did the same tests as you so can't wait to have the real interface. I noticed the color burst crystal divided by 8 gives you an IF of 8.44 KHz
conveniences, withoutmaking a single modification to my KWM-2A. :o)Bob - AE6RV--- FRANCIS CARCIA [EMAIL PROTECTED] wrote: You will be stuck in SSB or CW using your method. fc
YAHOO! GROUPS LINKS
Visit your group "soft_radio" on the web.
To unsubscribe from this g
Mike the CD4066 is a slower part look it up on the web The LS is a bit slower and does not have as muck output drive. They will work if you are connecting the interface to a radio IF like 455 KHz. The 4066 may have different pinouts than the 74hc part I don't remember. You can go to TI or
another common configuration is to use a fixed divide by N ratio then vary the DDS into the reference to move the pll. The DDS can be high frequency then post divided to limit spurs. this configuration uses a wider frequency range in the DDS so it can't be used with a crystal filter. The use of
would that increase the number of spurs but lower in amplitude?KD5NWA [EMAIL PROTECTED] wrote: Here is another item that will tweak your sense of reason.A DDS can have all of it's spurs cleaned up if when you take the sine wave value out of it's lookup table and add a small random number to
The only problem I ever have with ver 99 is in sync detectror AM mode. When
talking to multiple people a little off frequency the cf shifts trying to lock
to the new signal.
Then I have to go back to am mode recenter it then tune the radio to center
the signal again. not a real problem I
So what configuration is best. Big series resistor with small cap to reduce
load during overlap or shorter sample time?
Milt Cram [EMAIL PROTECTED] wrote: Hi all,
I would like to submit some observations based on my modelling of the
detectors in SoftRock40...
When the source impedance is
Dan,
I built a homebrew board to plug into my RA6830 that converts 455 KHz to
7.625 KHz using a color burst crystal divided by 8. My converter is a double
balanced tayloe and oscillator is a soft rock 40 copy. I put a 6 dB pad at the
input so the input Z is forced to 50 ohms. It would be very
My 455 KHz interface is similar to the flex front end without filters. I just
used a 6 dB pad on the input. The only change needed was to reduce the gain of
the amplifiers so the sound card doesn't saturate. It works great. I have done
the interface on both sides of the 455 khz filters. 602
A good SAW oscillator will do 500 mHz. with the same performance as a crystal
oscillator.
Jim Miller [EMAIL PROTECTED] wrote:
I was looking last night at Harold Johnson's paper on the EMRFD CD that
described his 105Mhz VFO based on a helical resonator. From his summary:
Measured noise
Take an HP8640B and feed it an external reference divided by 4 to make up for
the johnson counter and the readout will track.
[EMAIL PROTECTED] [EMAIL PROTECTED] wrote:Someone build this for us all
to use in SDR!
I want to mention an idea I once had in the 80's I told someone about
each sample makes a very small correction so the frequency doesn't jump around.
[EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I am downloading all of the Huff Puff wesites now and will look for info on noise if available. I do know of a way to get around the jumping noise if it is present and
I'm told the DDC has a limited dynamic range so I think the first method sounds better. Cubic, Transworld and Harris all have used tunable preselectors. I'm lucky to have one that will be my front end. My unit is controlled by 4 BCD decade inputs.
10 MHz, 1 MHz, 100 KHz, 10 KHz. The Harris RF
I wish I was smart enough to help.
i2phd [EMAIL PROTECTED] wrote: --- In soft_radio@yahoogroups.com, frank carcia [EMAIL PROTECTED] wrote:
I wonder when AM will be added to this cool program? frank wa1gfz
It will eventually be added, together with FM and ECSS. They are just
not high in the
part 5 fcc license.
i2phd [EMAIL PROTECTED] wrote:
--- In soft_radio@yahoogroups.com, [EMAIL PROTECTED] [EMAIL PROTECTED]
wrote:
I know that 1750 meters is an unlicensed experimental band {160
to 190 kHz @ 1 watt input} and now there is the 137 kHz band.
Can someone tell us about
I find even the Tayloe works better when the input bandwidth is limited. I changed to a 40 KHz roofing filter in my RA6830 interface and found the performance degraded
letting more of the world through the front door. Saturation is saturation and there is only 2 ways to avoid it. Roofing filter
How about making your boards mate with the Atlas HPSDR board with din connectors? Or join the gang.
David Brainerd [EMAIL PROTECTED] wrote: I am planning on having some boards made the 1st of next month(July).
I can either get about 25 on prototype boards in 5 days or get
production
I use minimum gain in the op amps after the detector to get maximum dynamic
range.
BTW Sound card codec is an A/D. frank
[EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
Alberto:
Over at the very controversial group softrock40 group. I suggested once that
they could add analog to digital
The problem with a broadband AGC is the strongest singnal into the broad input
sets the attenuation for the whole input frequency range raising the system
mds. This then reguces the dynamic range,
[EMAIL PROTECTED] [EMAIL PROTECTED] wrote: ZN414 IC
3 pin TO-92 and 8 pin DIP version.
Leon,
Which Racal did you work for? I have a few RA6830s in the shack with the
RA019 fractional n lsi chip. Works well. 1 MHz. into the phase detector.
Frank WA1GFZ
Leon Heller [EMAIL PROTECTED] wrote:
- Original Message -
From: [EMAIL PROTECTED]
To:
Do you contacts of people who may have worked on the 6830 software?
Leon Heller [EMAIL PROTECTED] wrote: - Original Message -
From: FRANCIS CARCIA [EMAIL PROTECTED]
To: soft_radio@yahoogroups.com
Sent: Monday, June 12, 2006 2:16 AM
Subject: Re: [soft_radio] Re: A/D Idea - New
variable clean LO's will be rewarded with a high
performance in the little radios.
At 11:32 PM 6/12/2006, you wrote:
Francis Carcia:
Yes there is that problem of agc acting on all of the spectrum
coming into the sound card over 96 kHz. So I propose that as a
standard when desired to be use
The only agc action is to generate a fixed audio output for any signal coming
in up to the saturation point of the A/D or noise floor. All the software I
have used does this.
You would need additional computer interface to do anything else. IE: FLEX
SDR changing gain or turning on attenuator
I suppose it would be easy to put an analog loop around the front end that
reduces the gain as the saturation point of the A/D is approached. A variable
gain amplifier or passive pin attenuator would work well. Another approach
would to use the computer to generate a D/A output based on the
I'm using a RA6830 DF radio as front end for my SDR module. It has a digital
step AGC with 2 dB steps.
KD5NWA [EMAIL PROTECTED] wrote: I prefer the idea of programmed gain
steps, so you know exactly what
the system gain is at all times therefore you will be able to have
your signal
73s de ik2wqi - Andreas
FRANCIS CARCIA wrote:
I suppose it would be easy to put an analog loop around the front end that
reduces the gain as the saturation point of the A/D is approached. A variable
gain amplifier or passive pin attenuator would work well. Another approach
would to use
powerful kind of AGC, aligned to the requirements of a modern SDR.
vy 73s de ik2wqi - Andreas
FRANCIS CARCIA wrote:
I don't like anything pulsing in a RX front end to raise noise. maybe an
analog AGC would be simple. just monitor the A/D input and reduce the gain
when needed. The problem
I must be stupid I don't see any spectrum analyzer on the site but found all the
other stuff. Where is thr sa3000 hidden?
[EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
http://www.infinitespectra.com
Francis:
I temporary uploaded the SA 3000 (3002) in the group files and plan
to delete
can you please send me the link again.
[EMAIL PROTECTED] [EMAIL PROTECTED] wrote: It should be on the
first main file page. As SA 3000.zip the actual
model is SA 3002, thats the way the zip came. It is not in a folder.
It is also over at HuffPuffVFO.
It is listed as a temporary file
A pair of good double balanced mixers sounds a lot easier
Frank [EMAIL PROTECTED] wrote: Hello,
I was wondering if anybody experimented with frequencies above 30MHz for FET
switch
demodulation. If I had a carrier frequency of say 900MHz in ISM, or some lower
carrier for
remotes like
Look at the vco control voltage with a scope. Say it is slammed against a rail
high or ground. This means the reference divider or the divide by N are not set
up properly.
If it is oscillating then the filter is wrong. surf old motorola for special
functions for applications information. The
making small pulses to hold the vco on frequency.
Then you can fine tune the filter.
hope this helps Good Luck. Frank WA1GFZ
Frank [EMAIL PROTECTED] wrote:
--- In soft_radio@yahoogroups.com, FRANCIS CARCIA [EMAIL PROTECTED]
wrote:
Look at the vco control voltage with a scope. Say
Merry Christmas and Happy New Year To the software master! Frank
i2phd [EMAIL PROTECTED] wrote: Merry Christmas and Happy New Year
2007
to everybody !
73 Alberto I2PHD
[Non-text portions of this message have been removed]
[Non-text portions of this message have been
I was just telling a lowfer friend about your radio also. he is part 5 on 137
KHz.
i2phd [EMAIL PROTECTED] wrote: --- In soft_radio@yahoogroups.com,
Phil Covington [EMAIL PROTECTED]
wrote:
Since the actual DSP is done in the PC, RX bandwidths less than 25 Hz
are possible. When I
Thank you very much!
Giancarlo [EMAIL PROTECTED] wrote: Hi All,
If you like to know more about D'MIXER that removed the mixer from
the most critical stages in a receiver see what Martein Bakker,
PA3AKE, has just published; a magnificent document regarding his
evaluation of Colin
Alberto,
We will be waiting to see pictures and performance data on receivers from the
home of the high performance race car. fc
i2phd [EMAIL PROTECTED] wrote:
--- In soft_radio@yahoogroups.com, rhblumeng [EMAIL PROTECTED]
wrote:
Hi Alberto -
For Guy Atkins' comments on using
Anybody ever try using 2N5109s in an Hmode mixer with RF drive. Frank WA1GFZ
Giancarlo [EMAIL PROTECTED] wrote: Hi all,
I do not have G3SBI 74AC04 fundamental squarer but you can adapt the
one used in the I7SWX 2T H-Mode Mixer. I have loaded the circuit
diagram in Files.
The FSA3157
Wow,
You can get samples of the 1 gHz DDSI have a beautiful 1 GHz. SAW
oscillator I would love to interface it to. fc
i2phd [EMAIL PROTECTED] wrote:
--- In soft_radio@yahoogroups.com, D. J. Wang [EMAIL PROTECTED] wrote:
Hi Janne,
An PLL LO with large step size indeed made
by the sound card not my input board. frank
Giancarlo [EMAIL PROTECTED] wrote:
Hi Frank,
thanks for clarifying your question
--- In soft_radio@yahoogroups.com, FRANCIS CARCIA [EMAIL PROTECTED] wrote:
Hi,
I was thinking about discrete switching devices like a good fast
transistor
PROTECTED] wrote:
Hi Francis
--- In soft_radio@yahoogroups.com, FRANCIS CARCIA [EMAIL PROTECTED] wrote:
Hi,
So the square vave drive to a bus switch must saturate better
than the SD5000. Racal drives the gates of the SD5000 through a 1:2
transformer with about 10 volts peak to peak
I love software disconnected from gatesware. ECSS works great for me (I'll
admit I'm sucking up because I prefer Alberto's software). The only problem I
have with it is the center frequency will shift off the set point when it trys
to lock to carriers off to the side. It will walk across the
Berg LA6UY
--- In soft_radio@yahoogroups.com, FRANCIS CARCIA [EMAIL PROTECTED] wrote:
...ECSS works great for me...
Alberto,
My main concern is the shift in the capture range as the ECSS attempts to
lock to a carrier near the edge of the selected capture range (CF +/-). When
this happens I have to select AM retune then reselect ECSS. If the program
dropped back to am mode you would still decode audio while
usually the attack time is constant while decay varies. It can be as fast as a
couple hundred ms or as log 6 to 8 seconds. then there is a third function in
some receivers called the hang time where the agc does not decay until after
the hang time.
i2phd [EMAIL PROTECTED] wrote: ---
I found the same poor specs on LTC chips.
Alberto I2PHD [EMAIL PROTECTED] wrote: wb8lga wrote:
I've been looking for some IC chips that can be used for SDR. I've located
one. Its the RS2713 by RF Micro-Devices. I have requested a few samples from
them . I hope to have them by next
FYI Guys I think Alberto's software does a better job decoding AM that Flex
software.
I run a RA6830 in parallel with my SDR set up. A couple weeks ago I was on
160 AM with very poor conditions. No audio was coming out of the Flex software.
(HPSDR interface with homebrew converter) but I was
always in my book!
i2phd [EMAIL PROTECTED] wrote: --- In soft_radio@yahoogroups.com,
FRANCIS CARCIA [EMAIL PROTECTED] wrote:
FYI Guys I think Alberto's software does a better job decoding AM
that Flex software.
I run a RA6830 in parallel with my SDR set up. A couple weeks ago
I
I built a double balanced tayloe. A friend and I made pc boards so the module
would plug into my Racal RA6830.
Softrock is a lot quicker and cheaper. frank
garys_dad [EMAIL PROTECTED] wrote:
--- In soft_radio@yahoogroups.com, Adnan Yusuf [EMAIL PROTECTED]
wrote:
I am planning to
Softrock 6 and the right crystal does the same thing for under $20 and it had
op amps after the converter to get a bit of gain. gfz
David [EMAIL PROTECTED] wrote: For those of you that have another
radio with a 10.7MHz IF tap, here's
another SDR option.
Mini Circuits
Youngblood started flex as a company after he wrote the articles. He started by
selling just a RX then later it grew into an XCVR gfz
Frank [EMAIL PROTECTED] wrote: Hello,
Is SDR for the Masses supposed to be the flex-radio? I recall that
was in the Yongblood article titles, I was not
I built the double balanced Tayloe with the TI 3253 that words very well. The
INA163s gain is X10 since my unit hangs off a 455 KHz IF. I put a 6 dB pad on
the input to force 50 ohms.
This feeds my HPSDR set up in the low gain setting. The HPSDR in high gain
mode requires lower op amp gain
1N270s are not that good and fairly high leakage try 1N5711
Daniel Jackson [EMAIL PROTECTED] wrote: I am using 1N270 hot carrier
diodes which are more sensitive than the
past, small signal diodes, in QSD mixer designs. I borrowed the idea
from the SPL-1 and TUF-1 mixers.
I was
Good reading. I think it will be a while before SDR matches that performance
but it does do very well processing the IF. fc
Giancarlo [EMAIL PROTECTED] wrote: Yes, again about the H-Mode Mixer
but this time A High Dynamic Range
Front-End by Martein Bakker, PA3AKE.
Martein has just
I bought a nice 7904 a couple years ago then found the plug- ins I can easily
see a 1GHz. sine wave.A friend just gave me two new CRTs. I'm into it for
under $200.
HP8640B is still one of the best generators for ham use. You really want a
pair to test Dynamic range. An HP3400 RMS meter is
a 6 dB resistive pad works for me connecting to the IF of my RX
Andre Belokon [EMAIL PROTECTED] wrote: Hello
I recently studied schematic of SDRZero
http://py2wm.qsl.br/SDR/SDRZero-2.html. this sdr receiver include rf
amplifier (MMIC variation) between bandpass filter and QSD. author
Check your input to make sure it is a stereo L/R input. Image rejection will be
bad if it is a single input.
Leif Asbrink [EMAIL PROTECTED] wrote: Hi Vojtech,
I built a SoftRock RXTX 40 recently and I am disappointed with its
image suppression when using built in laptop sound card.
alberto,
I'm hoping you add HPSDR Mercury to your software for the same reason. fc
--- On Sat, 12/27/08, i2phd i2...@weaksignals.com wrote:
From: i2phd i2...@weaksignals.com
Subject: [soft_radio] Re: sdr 1000
To: soft_radio@yahoogroups.com
Date: Saturday, December 27, 2008, 10:56 AM
--- In
Alberto,
My Mercury arrived today. fc
--- On Sat, 12/27/08, i2phd i2...@weaksignals.com wrote:
From: i2phd i2...@weaksignals.com
Subject: [soft_radio] Re: sdr 1000
To: soft_radio@yahoogroups.com
Date: Saturday, December 27, 2008, 1:27 PM
--- In soft_ra...@yahoogro ups.com, FRANCIS CARCIA
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