Re: [Flexradio] Frequency Calibration

Yes, ageing is the fastest te fist few month of the life of the Xtal See as an example http://www.golledge.com/pdf/products/xtl_ld/hc49.pdf Calibration 30ppm (standard) Ageing

Re: [Flexradio] Frequency Calibration

ast the "really steep" part of the aging curve, and that costs money. Essentially, you're buying an oscillator that already has 1000 or more hours on it. >Bob W6TR >- Original Message - >From: "Frank Mayer" <[EMAIL PROTECTED]> >To: >Sent:

Re: [Flexradio] Frequency Calibration

Thanks for the tip! - Original Message - From: "Bob Maser" <[EMAIL PROTECTED]> To: "Frank Mayer" <[EMAIL PROTECTED]>; Sent: Monday, May 28, 2007 5:06 PM Subject: Re: [Flexradio] Frequency Calibration > Mine started in the -150 range and 6 months lat

Re: [Flexradio] Frequency Calibration

PROTECTED]> ; pa0pvn(a)gmail.com ; pa0pvn(a)amsat.org . Van: [EMAIL PROTECTED] namens Bob Maser Verzonden: ma 28-5-2007 23:06 Aan: Frank Mayer; flexradio@flex-radio.biz Onderwerp: Re: [Flexradio] Frequency Calibration Mine started in the -150 range and 6

Re: [Flexradio] Frequency Calibration

Frank .. all crystals change frequency with age. The change should be less and less with time and in the same direction, until it settles down. I would say that what you are seeing is quite normal. If you want to worry about something consider if the air filter catching enough dust! The real qu

Re: [Flexradio] Frequency Calibration

r" <[EMAIL PROTECTED]> To: Sent: Monday, May 28, 2007 4:45 PM Subject: [Flexradio] Frequency Calibration >I have had my SDR-1000 since December. When I first got the clock offset >was set to about +100 for accurate calibration. Since then it has been >steadily needed to be

[Flexradio] Frequency Calibration

I have had my SDR-1000 since December. When I first got the clock offset was set to about +100 for accurate calibration. Since then it has been steadily needed to be reset to a lower value. It is at -1300 now. Could the problem be the crystal going bad? Frank WA3JBT. -- next par

Re: [Flexradio] Frequency Calibration Problem

I encountered exactly this problem years ago when using a $50,000 high-end spectrum analyzer (at least it was back then - HP 8560 series) to automatically characterize a wideband free-running VCO's tuning range, tuning slope, harmonics, etc. across its entire tuning range (before the days of the fa

Re: [Flexradio] Frequency Calibration Problem

own Roman consultant > >-Original Message- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of Larry W8ER >Sent: Wednesday, January 17, 2007 3:20 PM >To: FlexRadio - Eric; flexradio@flex-radio.biz >Subject: [Flexradio] Frequency Calibration Problem > >

[Flexradio] Frequency Calibration Problem

Thanks for the explanation Eric. I experience exactly the same thing. Norman -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070117/168e9ec8/attachment.html _

Re: [Flexradio] Frequency Calibration Problem

y, January 17, 2007 3:20 PM To: FlexRadio - Eric; flexradio@flex-radio.biz Subject: [Flexradio] Frequency Calibration Problem I have three versions of Power SDR available. They are PowerSDR 1.6.3 (with K6JCA mods), PowerSDR 1.8.0, and PowerSDR latest SVN. There are three groups of numbers

Re: [Flexradio] Frequency Calibration Problem

It's definitely not just your problem. The display code changed in the latest versions to enable the zoom/pan features that came along with the wider display. Because of this, we have to use a more flexible manner of converting a pixel on the display to a frequency. Unfortunately the resolution

[Flexradio] Frequency Calibration Problem

I have three versions of Power SDR available. They are PowerSDR 1.6.3 (with K6JCA mods), PowerSDR 1.8.0, and PowerSDR latest SVN. There are three groups of numbers below the panadapter. First is hz deviation of the frequency of the strongest signal in the filter passband. Second is that signal'

Re: [Flexradio] Frequency calibration, measurement of unknowns with SDR1000Re: Question regarding commercial AM broadcasters' carrieraccuracy

[Flexradio] Frequency calibration, measurement of unknowns with SDR1000Re: Question regarding commercial AM broadcasters' carrieraccuracy When I was chiefing, I think the AM tolerance was 20 Hertz. To tweak it, I would have to shut down a transmitter, open the door, and adjust the trimmer. Th

Re: [Flexradio] Frequency calibration, measurement of unknowns with SDR1000Re: Question regarding commercial AM broadcasters' carrieraccuracy

At 10:42 AM 11/7/2006, Mike Naruta wrote: >When I was chiefing, I think the AM tolerance was 20 Hertz. Still is, that's the FCC spec. Might want to look at http://www.w3eee.com/kfi.htm for an interesting discussion of this.. errors of 1 Hz aren't unusual.

Re: [Flexradio] Frequency calibration, measurement of unknowns with SDR1000Re: Question regarding commercial AM broadcasters' carrieraccuracy

When I was chiefing, I think the AM tolerance was 20 Hertz. To tweak it, I would have to shut down a transmitter, open the door, and adjust the trimmer. They did not like me taking the station down, or switching to the auxiliary transmitter, so I just checked frequency occasionally. We also had qu

[Flexradio] Frequency calibration, measurement of unknowns with SDR1000Re: Question regarding commercial AM broadcasters' carrieraccuracy

At 01:30 PM 11/6/2006, Eric Wachsmann wrote: >That procedure makes more sense to me. It is probably going to come down to >what tools you are using to make the final measurement. Our display is only >accurate to 11Hz per bin at best (more likely more Hz / pixel on the >display). Single point cal

Re: [Flexradio] Frequency Calibration on Recent SVN's

I use the Phase 1 display and SAM mode. Use the Freq Cal button to get close. On the Hardware Config tab you can use the up and down on the DDS Clock Offset to jump by tens until you get the pattern to rotate slowly clockwise and counter-clockwise. Then you can type in values in between to get

Re: [Flexradio] Frequency Calibration on Recent SVN's

] [mailto:[EMAIL PROTECTED] On Behalf Of John Hansen Sent: Sunday, September 10, 2006 1:42 PM Cc: flexradio@flex-radio.biz Subject: Re: [Flexradio] Frequency Calibration on Recent SVN's FWIW, I found that if I used the WWV signal at 15 MHz the calibration procedure appeared to work. If I try it

Re: [Flexradio] Frequency Calibration on Recent SVN's

FWIW, I found that if I used the WWV signal at 15 MHz the calibration procedure appeared to work. If I try it at 10 MHz, I get the error referenced in my previous message. The 10 MHz value appears to be broken in the current SVN version. Thanks, everyone, for the suggestions. John W2FS

Re: [Flexradio] Frequency Calibration on Recent SVN's

Exactly Another weird little thing I've noticed when tuning using DSB is in the phase display mode. According to which side of center your on the display will move in a clockwise or counter-clockwise direction. I think ideally it should be completely stopped and inthe middle of the display but my r

Re: [Flexradio] Frequency Calibration on Recent SVN's

At 10:17 AM 9/10/2006, Tim Ellison wrote: >Just to add to Jimmy's comments. > >After allowing the SDR-1k to warm up for hours, I tried the DSB method >described here where you zero beat the constant tone with ticks (not >just the ticks alone). > >After calibrating from wwv using 15.0 MHz, the DSB m

Re: [Flexradio] Frequency Calibration on Recent SVN's

On 9/10/06, Tim Ellison <[EMAIL PROTECTED]> wrote: > Now the real question: is this a problem with the calibration routine of > just an anomaly of using a frequency standard that is effected by > atmospheric and solar factors? > I have had problems before when the signal was not sufficient. I su

Re: [Flexradio] Frequency Calibration on Recent SVN's

ge- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jimmy Jones Sent: Sunday, September 10, 2006 12:15 PM To: flexradio@flex-radio.biz Subject: Re: [Flexradio] Frequency Calibration on Recent SVN's I've noticed that the software does not cal wwv properly for some time now

Re: [Flexradio] Frequency Calibration on Recent SVN's

nday, September 10, 2006 10:51 AM Subject: [Flexradio] Frequency Calibration on Recent SVN's > I noticed that the frequency calibration was off on a couple of the > recent SVN's (WWV at 10 MHz was about 20 Hertz low). So I tried to run > the frequency calibration routine. When I d

Re: [Flexradio] Frequency Calibration on Recent SVN's

Bob Barlow -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Hansen Sent: Sunday, September 10, 2006 11:52 AM To: flexradio@flex-radio.biz Subject: [Flexradio] Frequency Calibration on Recent SVN's I noticed that the frequency calibration was off

[Flexradio] Frequency Calibration on Recent SVN's

I noticed that the frequency calibration was off on a couple of the recent SVN's (WWV at 10 MHz was about 20 Hertz low). So I tried to run the frequency calibration routine. When I do this I get a pop message box that says, "Peak is Outside Valid Range." I don't have this problem with 1.6.2

Re: [Flexradio] frequency calibration

Yesterday I performed all three calibration routines with 1.6.0 (I had not re-done them since beta 14) and they seemed to work very smoothly indeed. The PA calibration seemed to work faster than ever before. It might be worth a 'cold' installation when upgrading to 1.6.x!

Re: [Flexradio] frequency calibration

esult. Pete. N3EVL > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Eric > Wachsmann - FlexRadio > Sent: Tuesday, April 18, 2006 1:50 PM > To: 'Jeff Griffin'; 'Reflector Flex-Radio' > Subject: Re: [Flexrad

Re: [Flexradio] frequency calibration

. Eric Wachsmann FlexRadio Systems > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > radio.biz] On Behalf Of Jeff Griffin > Sent: Saturday, April 15, 2006 10:00 AM > To: Reflector Flex-Radio > Subject: [Flexradio] frequency calibration > >

[Flexradio] frequency calibration

Yesterday I received the SDR-1000 I purchased used. All is working fine on my 2gig p4 512 mb XP PRO machine. Only problem I'm having is getting the calibration routine to work properly. The best I can do on WWV is about 500 hz low. I tried several different WWV frequencies, but can do a much

Re: [Flexradio] frequency calibration etc

At 04:09 PM 11/23/2005, Robert McGwier wrote: Relatively prime numbers are your friend. Indeed, but I was thinking that one might be able to adopt an off the shelf dual modulus counter, which typically differ by one count. Actually, there's all kinds of other strategies, too.. you can use the

Re: [Flexradio] frequency calibration etc

At 03:52 PM 11/23/2005, ecellison wrote: Jim Could we just not divide at all using the 1 pps gate and just use the variance of the last 2 or three digits, and make the assumption that it was accurate 200,000,xxx? I wouldn't think we would want to make any correction in software more frequently t

Re: [Flexradio] frequency calibration etc

Relatively prime numbers are your friend. Jim Lux wrote: At 02:15 PM 11/23/2005, ecellison wrote: Lyle Thanks. Well not too difficult to divide the 200 by 10 externally and perhaps provide buffering for the 200 mhz sig coming out of the SDR. Eric2 Even better, if you don't want to

Re: [Flexradio] frequency calibration etc

store a running average of the last three digits in an accumulator for the comparison against the 'rock'. Eric2 -Original Message- From: Jim Lux [mailto:[EMAIL PROTECTED] Sent: Wednesday, November 23, 2005 5:44 PM To: ecellison Cc: '[EMAIL PROTECTED] Biz' Subject:

Re: [Flexradio] frequency calibration etc

At 02:15 PM 11/23/2005, ecellison wrote: Lyle Thanks. Well not too difficult to divide the 200 by 10 externally and perhaps provide buffering for the 200 mhz sig coming out of the SDR. Eric2 Even better, if you don't want to give up the resolution (dividing by 10 does that) is divide by 10 a

Re: [Flexradio] frequency calibration etc

At 01:56 PM 11/23/2005, you wrote: Folks   I have a stupid question which I should be able to look up. Can an FPGA pin actually accept a 10 mhz or 200 mhz signal so that the LE’s could be configured to divide it down? Yes.. depends on the FPGA, though, what the maximum clock rate is. Jim 'rmk

Re: [Flexradio] frequency calibration etc

Hello Eric! Thanks. Well not too difficult to divide the 200 by 10 externally and perhaps provide buffering for the 200 mhz sig coming out of the SDR. The EP1C3T100 used in the Xylo board you mentioned earlier is good to 275/320/405 MHz depending on the speed grade of the part. That may be

Re: [Flexradio] frequency calibration etc

;Jeff Anderson'; 'Jim Lux'; '[EMAIL PROTECTED] Biz' Subject: Re: [Flexradio] frequency calibration etc > Can an FPGA > pin actually accept a 10 mhz or 200 mhz signal so that the LE's could be > configured to divide it down? 10 MHz is no problem. 200 MHz!

Re: [Flexradio] frequency calibration etc

Can an FPGA pin actually accept a 10 mhz or 200 mhz signal so that the LE’s could be configured to divide it down? 10 MHz is no problem. 200 MHz! Many FPGAs can handle this frequency, some go faster, many can't go quite this fast. 73, Lyle KK7P

Re: [Flexradio] frequency calibration etc

). It’s fun tho!   Eric     From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Jeff Anderson Sent: Wednesday, November 23, 2005 12:04 PM To: Jim Lux; [EMAIL PROTECTED] Biz Subject: Re: [Flexradio] frequency calibration etc   Hi Jim, Jim Lux <[EMAIL PROTECTED]>

Re: [Flexradio] frequency calibration etc

At 09:04 AM 11/23/2005, Jeff Anderson wrote: Hi Jim, Jim Lux <[EMAIL PROTECTED]> wrote: Or, use a fixed oscillator, and run an NCO in the FPGA to create an offset frequency, which you then mix with the fixed oscillator to create your locked output. [This is what we are doing in an experim

Re: [Flexradio] frequency calibration etc

I like your idea of keeping the existing low phase noise Oscillator and measure the drift and correct in the software. The whole thing could be quite cheap yet give you good results. Like you mentioned using a small CPU running off a GPS calibrated clock to measure the Oscillator output, multip

Re: [Flexradio] frequency calibration etc

Message - From: "Jim Lux" <[EMAIL PROTECTED]> To: "Jeff Anderson" <[EMAIL PROTECTED]>; "[EMAIL PROTECTED] Biz" Sent: Wednesday, November 23, 2005 10:10 AM Subject: Re: [Flexradio] frequency calibration etc Or, use a fixed oscillator, a

Re: [Flexradio] frequency calibration etc

Hi Jim,Jim Lux <[EMAIL PROTECTED]> wrote: Or, use a fixed oscillator, and run an NCO in the FPGA to create an offset frequency, which you then mix with the fixed oscillator to create your locked output. [This is what we are doing in an experimental deep space transponder.. where phase noise is o

Re: [Flexradio] frequency calibration etc

nesday, November 23, 2005 10:10 AM Subject: Re: [Flexradio] frequency calibration etc > > > Or, use a fixed oscillator, and run an NCO in the FPGA to create an offset > frequency, which you then mix with the fixed oscillator to create your > locked output. [This is what we are doing

Re: [Flexradio] frequency calibration etc

At 05:14 AM 11/23/2005, Jeff Anderson wrote: Hi Eric - To your earlier post regarding implementing within an FPGA the circuitry Alberto pointed to. Yes, this is easily done. In fact, I'd think you could improve upon the design, too. For example, in the schematic you really don't want the 43K

Re: [Flexradio] frequency calibration etc

Hi Eric - To your earlier post regarding implementing within an FPGA the circuitry Alberto pointed to. Yes, this is easily done. In fact, I'd think you could improve upon the design, too. For example, in the schematic you really don't want the 43K resistor across the 470 uF cap - it, in series

Re: [Flexradio] Frequency calibration etc

- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jim Lux Sent: Tuesday, November 22, 2005 5:57 PM To: ecellison; 'John Ackermann N8UR' Cc: FlexRadio@flex-radio.biz Subject: Re: [Flexradio] Frequency calibration etc At 02:16 PM 11/22/2005, ecellison wrote: John Tha

Re: [Flexradio] Frequency calibration etc

I know that Gerald is a distributor since you don't sell M-Audio products without being one. So I suppose that constitutes a relationship. Bob Mark Amos wrote: You guys have probably already hashed this kind of thing out earlier, but does anyone at Flex have a relationship with the M-Audio

Re: [Flexradio] Frequency calibration etc

PM To: ecellison; 'John Ackermann N8UR' Cc: FlexRadio@flex-radio.biz Subject: Re: [Flexradio] Frequency calibration etc At 02:16 PM 11/22/2005, ecellison wrote: >John > >Thanks for the input. I have not heard of anyone else using the external >reference, and you never noted any sev

Re: [Flexradio] Frequency calibration etc

At 03:31 PM 11/22/2005, John Ackermann N8UR wrote: Well, you motivated me to do a simple test. I'm using the Baudline signal analysis program under Linux and clocking the sound card at (nominal) 96ksamples/second. Bottom line -- when I started the test half an hour ago, the nominal 11,025H

Re: [Flexradio] Frequency calibration etc

f you have to measure the difference on a high quality counter.. er well. > Also thanks in advance for the tests. > > Thanks! > > -Original Message- > From: John Ackermann N8UR [mailto:[EMAIL PROTECTED] > Sent: Tuesday, November 22, 2005 8:35 AM > To: ecellison >

Re: [Flexradio] Frequency calibration etc

At 02:16 PM 11/22/2005, ecellison wrote: John Thanks for the input. I have not heard of anyone else using the external reference, and you never noted any severe adverse effects. Is the 5065a keeping the SDR dead on, which is the primary objective in this whole discussion. Do you notice variation

Re: [Flexradio] Frequency calibration etc

- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Gollum Sent: Tuesday, November 22, 2005 10:25 AM To: FlexRadio@flex-radio.biz Subject: Re: [Flexradio] Frequency calibration etc > Well, I think we are a ways away from a kit. I was sort of suggesting that > we try just usi

Re: [Flexradio] Frequency calibration etc

22, 2005 8:35 AM To: ecellison Cc: 'Ross'; FlexRadio@flex-radio.biz Subject: Re: [Flexradio] Frequency calibration etc ecellison wrote: > Ross > > > > Well, I think we are a ways away from a kit. I was sort of suggesting that > we try just using the Rockwell - J

Re: [Flexradio] Frequency calibration etc

Robert McGwier wrote: Awesome Alberto! That is under an hours work to layout! We need to google and delve more deeply into our Italian genius' web site!! Bob, I am not the author of the project, it was developed by Andy Talbot G4JNT. I just hosted it in one of my pages. I have designed a

Re: [Flexradio] Frequency calibration etc

Awesome Alberto! That is under an hours work to layout! We need to google and delve more deeply into our Italian genius' web site!! Bob Gollum wrote: Well, I think we are a ways away from a kit. I was sort of suggesting that we try just using the Rockwell - Jupiter board and it's 10 mhz

Re: [Flexradio] Frequency calibration etc

And look here too: http://mysite.verizon.net/n1jez/osc/page5.html This board and Jupiter GPS module are available for $25, but apparently supplies are limited. A small number of us in the NJQRP club are doing a group project with it. You can see a close-up photo of a unit we had at the meeti

Re: [Flexradio] Frequency calibration etc

Well, I think we are a ways away from a kit. I was sort of suggesting that we try just using the Rockwell - Jupiter board and it's 10 mhz oscillator 'naked' and just see what we get. Give a look here : http://gpsdo.i2phd.com 73 Alberto I2PHD

Re: [Flexradio] Frequency calibration etc

Mike King - KM0T wrote: I too have been using an external 10 MHz source on my SDR. First I used a Rubidium source off of ebay, never noticed anything different from the internal crystal other than no drift. (rock solid) Note that I have only used it on 902 thru 24 GHz - where the SDR is the

Re: [Flexradio] Frequency calibration etc

You made the right decision to move from the rubidium. The "off ebay rubidium sources" almost all FM the line looking for it. This means that the output of one of these rubidiums is typically a zero mean on the frequency of interest and should never be used directly but only as a reference i

Re: [Flexradio] Frequency calibration etc

I too have been using an external 10 MHz source on my SDR. First I used a Rubidium source off of ebay, never noticed anything different from the internal crystal other than no drift. (rock solid) Note that I have only used it on 902 thru 24 GHz - where the SDR is the 28 MHz IF. I recently

Re: [Flexradio] Frequency calibration etc

ecellison wrote: Ross Well, I think we are a ways away from a kit. I was sort of suggesting that we try just using the Rockwell - Jupiter board and it's 10 mhz oscillator 'naked' and just see what we get. In 2 lengthy arounds on this thread mostly what we have is theory and nothing tried at

Re: [Flexradio] Frequency calibration etc

Rockwell board would be worth a shot.   Eric     From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Ross Sent: Tuesday, November 22, 2005 1:00 AM To: FlexRadio@flex-radio.biz Subject: [Flexradio] Frequency calibration etc   Eric Can you please put me down for a Reflock

[Flexradio] Frequency calibration etc

Eric Can you please put me down for a Reflock and other items as well. Thanks Ross ZL1WN

Re: [Flexradio] Frequency Calibration.

At 04:17 AM 6/12/2005, John Ackermann N8UR wrote: [EMAIL PROTECTED] wrote: >The current cal scheme is unlikely to ever work well for most users. The >issue >is the error in the oscillator in everyone's sound card. Without taking this >into >account, most of us can achieve very good accuracy at o

Re: [Flexradio] Frequency Calibration.

At 07:46 PM 6/11/2005, [EMAIL PROTECTED] wrote: The current cal scheme is unlikely to ever work well for most users. The issue is the error in the oscillator in everyone's sound card. Without taking this into account, most of us can achieve very good accuracy at one WWV frequency but will find it

Re: [Flexradio] Frequency Calibration.

[EMAIL PROTECTED] wrote: >The current cal scheme is unlikely to ever work well for most users. The >issue >is the error in the oscillator in everyone's sound card. Without taking this >into >account, most of us can achieve very good accuracy at one WWV frequency >but will find it is way off on ano

Re: [Flexradio] Frequency Calibration.

EMAIL PROTECTED]>; "FlexRadio Reflector" Sent: Saturday, June 11, 2005 20:26 PM Subject: Re: [Flexradio] Frequency Calibration. > For frequency cal you could use WWV or CHU. > > For level cal you can attach a dummy load, and set it to be whatever the > noise floor is supposed

Re: [Flexradio] Frequency Calibration.

For frequency cal you could use WWV or CHU. For level cal you can attach a dummy load, and set it to be whatever the noise floor is supposed to be - think these values are in the docs, as I recall -120 w/o RFT and -130 with. Of course, it won't really be calibrated with this approach, it wil

[Flexradio] Frequency Calibration.

Hi All,   With a receive only SDR-1000 RO [possible in the future] how does one complete both the Frequency / Level Calibration without any measure equipment i.e. signal generator?   Your comments are most welcome.   Thank you.   Greg