[Flexradio] J5(BPF) pins, sdr rf-spectrum
Hello, my 1W 4-board stack SDR (BPF v3.2, RFE v1.4, TRX v3.2, PIO v2.1 ) works fine for me. Great development with still great potential, congratulations to all those who did the work! I run it with the firebox and a Sony Vaio laptop. I made some measurements which might be of interest: Since I want to use the J5 connector on the BPF board to control the banpassfilters of the amplifier following the 1 W SDR, I checked the pins. I found that the ordering sequence differs from what is given on page 15 of the Hardware Manual v3.8. If I click on the bands 160 to 6 on Jeff's console, then pins are not activated increasing with increasing frequency, it is instead like 160 1 80 2 40 4 20 3 12 5 6 6 40 and 20 bands are interchanged. That of course is no problem, however, since it differs from the manual it is worth to notice. I did some measurements with a 2-tone test generator at the Mic input of the firebox and measured the rf-spectrum. First idea was to determine the maximum input for a good low intermodulation output signal. I was surprised to see that there is a kind of leveller built in which prevents overloading. The spectrum of the output signal does not change for Mic level above about -15 dB. The meausements were made at 3.7 MHz with 700 and 1900 Hz tones of the Elecraft generator, the spectrum was measured using the ESPI analyzer of RohdeSchwarz with 30 Hz resolution. All numbers in dB I am going to give, are refered to one of the test tones (not their sum). 1. the spectra with AM and FM are textbook like, wonderful. No additional signals higher than -85 dB are found in a +- 20 kHz sorrounding. 2. the spectra in SSB are almost identical for LSB and USB mirror inverted. I therefore describe only signals for LSB. After manual adjustment of phase and amplitude for image rejection, the two signals in the wrong upper sideband are suppressed by about -60 dB, which is a very good value. The intermodulation products 3rd order are down by about -56 dB, and those of 5th order down by about -73 dB. That's nice too. However there is a number of additional lines which I still cannot assign. Some are -50 dB down, most of them are close to -70 dB. Some appear as triple, rather close together and are independent of the image rejection adjustment. The latter is also true for the strongest lines in the wrong USB whose amplitudes are only about -46 dB down. Their frequencies do not correspond to expectations for intermodulation products. They appear at 3340 Hz and 4560 Hz obove 3.7 MHz in the above mentioned test set-up. Since they appear relatively strong in the wrong sideband, it is worth to think about. Any idea?? Regards, Hans, DL2MDQ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] J5(BPF) pins, sdr rf-spectrum
...The latter is also true for the strongest lines in the wrong USB whose amplitudes are only about -46 dB down. Their frequencies do not correspond to expectations for intermodulation products. They appear at 3340 Hz and 4560 Hz obove 3.7 MHz in the above mentioned test set-up. Since they appear relatively strong in the wrong sideband, it is worth to think about. Any idea?? Try shifting the Tx frequency slightly. They are likely to be spurs from the DDS. 73, Lyle KK7P ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
[Flexradio] cancelling IF signal from PowerSDR
I am using another application to send the signal to be transmitted to the soundcard output. I would like to be able to use the SDR-1000 hardware to transmit this signal without the IF signal provided by PowerSDR console. Is there a way to transmit this signal using the PowerSDR console to control the SDR-1000 hardware and have the IF signal (which goes to the soundcard output from PowerSDR) canceled so the only signal to the soundcard output is the one from my application? Thanks, Carlo -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20060511/89afae55/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
[Flexradio] UCB [OT] crosspoint switcher
This is off-topic, but does anyone know of a device that would allow me to select different antennae for more than one transceiver? Right now I have a remote coax switch that lets me choose any of a half-dozen antennas. I feed the output of that to a rotary coaxial switch that lets me select any of the rigs in the shack. The problem is that lets me use only one rig at a time. I would really like to have rig A use antenna 2 while rig B uses antenna 5, for example. It would be nice to integrate it to the SDR-1000 too. I could buy a couple dozen of Dow-Key relays, but that is costly and inelegant. I could use a patch bay, but I like being able to rotate a knob and listen to a signal on different antennas. In broadcasting we used video crosspoint switchers. Has anyone found an item like this that will handle a couple hundred watts of RF? Mike - AA8K ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] UCB [OT] crosspoint switcher
Sure, no problem, look for SO2R gear: http://www.aytechnologies.com/Products/RAS8x2data.htm and http://www.hamation.com/AntSw.htm de ken n9vv Mike Naruta wrote: This is off-topic, but does anyone know of a device that would allow me to select different antennae for more than one transceiver? ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
[Flexradio] SDR-Breadboard
Folks Version 4.0 is now released and on the SqueakMap. The web site http://myweb.tiscali.co.uk/g3ukb/ is up to date and contains a fair bit more info. I have even joined hamsdr.com so the link is there as well. This version has a lot of improvements and is much easier to manage. If all this means absolutely nothing to you then please spend a few minutes just looking at the web site. If interested then just a few hours of your precious time would be much appreciated to give it a whirl. Thanks to those that helped shape this release. It is still a work in progress but the current functionality is stable and very self contained so it won't pollute your system with random files! If there is enough interest I will do the Teamspeak thing to answer questions. I really am interested in your views and would love to have a discussion. I don't mind adverse comments in the least but it would be really disappointing to have no comments. Do you have a view on cross platform versa single platform? On languages? On single versa multi-machine deployment? On software front panels that imitate hardware versa software focused controls? On monolithic versa component GUI's? On the price of beer? Can anyone donate a brand new SDR1000 to a poor old guy that only has an old 3 board stack and may not have a job in a few months so can't get XYL approval to spend money? The forum has been very quiet lately; perhaps there really is no one out there... - 73 de Bob (G3UKB) *** Confidentiality Notice *** Proprietary/Confidential Information belonging to CGI Group Inc. and its affiliates may be contained in this message. If you are not a recipient indicated or intended in this message (or responsible for delivery of this message to such person), or you think for any reason that this message may have been addressed to you in error, you may not use or copy or deliver this message to anyone else. In such case, you should destroy this message and are asked to notify the sender by reply email. -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20060511/3306ef8f/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] SDR-Breadboard
You have at least one comment, mine. The way out in the fringe way of doing the software looks interesting and your displays look a lot nicer that the last time I looked. Seriously, I'll take a detailed look on Sunday. Off the top of my head, I would be more interested in a Linux port, I'm slowly moving away from Windows, and another functional SDR software package that I could fiddle with would be welcomed, that is if you have release the code to the public. As far as multi-platform if it can be reasonably done so it's supported in multiple platforms so much the better, if you can run under OSX that would be a big plus for me. I'm curious what sort of PC have you used this software with, so I can determine approximately the CPU power required. I'll give you more opinions and questions after I look at it more thoroughly. At 04:13 PM 5/11/2006, Cowdery, Bob [UK] wrote: Folks Version 4.0 is now released and on the SqueakMap. The web site http://myweb.tiscali.co.uk/g3ukb/ is up to date and contains a fair bit more info. I have even joined hamsdr.com so the link is there as well. This version has a lot of improvements and is much easier to manage. If all this means absolutely nothing to you then please spend a few minutes just looking at the web site. If interested then just a few hours of your precious time would be much appreciated to give it a whirl. Thanks to those that helped shape this release. It is still a work in progress but the current functionality is stable and very self contained so it won't pollute your system with random files! If there is enough interest I will do the Teamspeak thing to answer questions. I really am interested in your views and would love to have a discussion. I don't mind adverse comments in the least but it would be really disappointing to have no comments. Do you have a view on cross platform versa single platform? On languages? On single versa multi-machine deployment? On software front panels that imitate hardware versa software focused controls? On monolithic versa component GUI's? On the price of beer? Can anyone donate a brand new SDR1000 to a poor old guy that only has an old 3 board stack and may not have a job in a few months so can't get XYL approval to spend money? The forum has been very quiet lately; perhaps there really is no one out there... - 73 de Bob (G3UKB) *** Confidentiality Notice *** Proprietary/Confidential Information belonging to CGI Group Inc. and its affiliates may be contained in this message. If you are not a recipient indicated or intended in this message (or responsible for delivery of this message to such person), or you think for any reason that this message may have been addressed to you in error, you may not use or copy or deliver this message to anyone else. In such case, you should destroy this message and are asked to notify the sender by reply email. -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20060511/3306ef8f/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com Cecil Bayona KD5NWA www.qrpradio.com Windows, the most successful software virus ever Don Seglio Batuna ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] SDR-Breadboard
Hi Bob,
Interesting. I don't have any SDR-1000 or even a SoftRock going yet,
but it looks interesting.
Keep up the good work!
73,
Rob
Cowdery, Bob [UK] wrote:
Folks
Version 4.0 is now released and on the SqueakMap. The web site
http://myweb.tiscali.co.uk/g3ukb/ is up to date and contains a fair bit
more info. I have even joined hamsdr.com so the link is there as well.
This version has a lot of improvements and is much easier to manage. If
all this means absolutely nothing to you then please spend a few minutes
just looking at the web site. If interested then just a few hours of
your precious time would be much appreciated to give it a whirl. Thanks
to those that helped shape this release. It is still a work in progress
but the current functionality is stable and very self contained so it
won't pollute your system with random files! If there is enough interest
I will do the Teamspeak thing to answer questions.
I really am interested in your views and would love to have a
discussion. I don't mind adverse comments in the least but it would be
really disappointing to have no comments. Do you have a view on cross
platform versa single platform? On languages? On single versa
multi-machine deployment? On software front panels that imitate hardware
versa software focused controls? On monolithic versa component GUI's? On
the price of beer? Can anyone donate a brand new SDR1000 to a poor old
guy that only has an old 3 board stack and may not have a job in a few
months so can't get XYL approval to spend money?
The forum has been very quiet lately; perhaps there really is no one out
there...
- 73 de Bob (G3UKB)
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Re: [Flexradio] SDR-Breadboard
Bob Third time I've been blown outta my chair today... Fantastic man! Keep it up! Like Alice through the looking glass to the future! Amazing! It's great to be alive and still thinking! Thanks Eric2 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Cowdery, Bob [UK] Sent: Thursday, May 11, 2006 5:13 PM To: FlexRadio@flex-radio.biz Subject: [Flexradio] SDR-Breadboard Folks Version 4.0 is now released and on the SqueakMap. The web site http://myweb.tiscali.co.uk/g3ukb/ is up to date and contains a fair bit more info. I have even joined hamsdr.com so the link is there as well. This version has a lot of improvements and is much easier to manage. If all this means absolutely nothing to you then please spend a few minutes just looking at the web site. If interested then just a few hours of your precious time would be much appreciated to give it a whirl. Thanks to those that helped shape this release. It is still a work in progress but the current functionality is stable and very self contained so it won't pollute your system with random files! If there is enough interest I will do the Teamspeak thing to answer questions. I really am interested in your views and would love to have a discussion. I don't mind adverse comments in the least but it would be really disappointing to have no comments. Do you have a view on cross platform versa single platform? On languages? On single versa multi-machine deployment? On software front panels that imitate hardware versa software focused controls? On monolithic versa component GUI's? On the price of beer? Can anyone donate a brand new SDR1000 to a poor old guy that only has an old 3 board stack and may not have a job in a few months so can't get XYL approval to spend money? The forum has been very quiet lately; perhaps there really is no one out there... - 73 de Bob (G3UKB) *** Confidentiality Notice *** Proprietary/Confidential Information belonging to CGI Group Inc. and its affiliates may be contained in this message. If you are not a recipient indicated or intended in this message (or responsible for delivery of this message to such person), or you think for any reason that this message may have been addressed to you in error, you may not use or copy or deliver this message to anyone else. In such case, you should destroy this message and are asked to notify the sender by reply email. -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20 060511/3306ef8f/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
[Flexradio] Interesting artifact
I observed an interesting phenomenon this evening and I wonder if my assumption is on track. When I started up my SDR1K this evening, I had it connected to a dummy load to do a little audio testing. On the Panadapter, I noticed a signal 500 Hz wide that was about -100dBm in intensity that sounded like a whistle. I could really hear it because the noise floor was about -138dBm. The signal never changed in intensity, but was rapidly increasing in frequency. I checked on another radio and the signal was definitely in the SDR1K. I started tracking it at around 14.190 KHz and followed it up the band. As it crawled up the band, the rate of frequency change decreased, but the intensity never did. I tracked it to all the way to 14.290 KHz where it finally stabilized its frequency change. This whole process took about 20 minutes to complete. At this point I started transmitting and the peak jumped to 14.335 KHz. Once I quit transmitting it started to drop again to stabilize around 14.328 KHz. So it looks like this phenomenon is very likely temperature dependent. Am I correct to assume that this phenomenon is related to DDS thermally instability?? If it is DDS related, shouldn't the intensity of this signal decreased in intensity as it stabilized or should this S5 signal always be here? Should this DDS noise be this strong in intensity? I am just trying to figure out if this is normal operation of do I have some other problem. Any comments and opinions are welcome. -Tim --- Tim Ellison mailto:[EMAIL PROTECTED] Integrated Technical Services http://www.itsco.com/ Apex, NC USA 919.674.0044 Ext. 25 / 919.674.0045 (FAX) 919.215.6375 - cell PGP public key available at all public KeyServers Skype: kg4rzy ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] Interesting artifact
I'm sorry, I believe your SDR-1000 is processed by an evil Mongolian demon. Send it to me for about a year or two and I will exorcise the demons out. Let me know when you need my shipping address. On Thu, 2006-05-11 at 22:16 -0400, Tim Ellison wrote: I observed an interesting phenomenon this evening and I wonder if my assumption is on track. When I started up my SDR1K this evening, I had it connected to a dummy load to do a little audio testing. On the Panadapter, I noticed a signal 500 Hz wide that was about -100dBm in intensity that sounded like a whistle. I could really hear it because the noise floor was about -138dBm. The signal never changed in intensity, but was rapidly increasing in frequency. I checked on another radio and the signal was definitely in the SDR1K. I started tracking it at around 14.190 KHz and followed it up the band. As it crawled up the band, the rate of frequency change decreased, but the intensity never did. I tracked it to all the way to 14.290 KHz where it finally stabilized its frequency change. This whole process took about 20 minutes to complete. At this point I started transmitting and the peak jumped to 14.335 KHz. Once I quit transmitting it started to drop again to stabilize around 14.328 KHz. So it looks like this phenomenon is very likely temperature dependent. Am I correct to assume that this phenomenon is related to DDS thermally instability?? If it is DDS related, shouldn't the intensity of this signal decreased in intensity as it stabilized or should this S5 signal always be here? Should this DDS noise be this strong in intensity? I am just trying to figure out if this is normal operation of do I have some other problem. Any comments and opinions are welcome. -Tim --- Tim Ellison mailto:[EMAIL PROTECTED] Integrated Technical Services http://www.itsco.com/ Apex, NC USA 919.674.0044 Ext. 25 / 919.674.0045 (FAX) 919.215.6375 - cell PGP public key available at all public KeyServers Skype: kg4rzy ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
[Flexradio] Hamvention Activities.
Subject: Hamvention Activities. Hello Flexers. The Hamvention is fast approaching. SDR1000s are flying off the assembly line. And, a group of talented individuals are polishing their Dayton presentations. Here's what we know about SDR and FlexRadio System Activities... Friday. Inside exhibits open at 9 AM. FRS has two booths this year and will have 3 radio setups. Two of the SDR1000s will be operational; they are for use by for perspective Flexers and current Flexers who might be having withdrawal pains. Friday Evening: FRS will be attending the FDIM vendor night at the Holiday Inn in Fairborn Saturday. Inside exhibits open at 8 AM 8:30 a.m. - 9:30 a.m. Software Defined Radios Open Source Software Defined Radios- the new wave in radio communications. Moderator: Gerald Youngblood, K5SDR Open source Software Defined Radio is no longer just for experimenters, but for all amateurs regardless of their technical ability and or experience. This forum will discuss what the amateur community needs to know about the flexibility, performance, and operation of SDRs from the $15 SoftRock-40 TM to the top performing FlexRadio SDR-1000(r). 12:00 p.m. - 1:45 p.m. SOFTWARE DEFINED RADIO - GROUNDSWELL TO TIDAL WAVE Moderator: Eric Ellison, AA4SW, V31SR Ever since Gerald Youngblood K5SDR published a series of articles in QEX magazine and offered the first, off the shelf SDR transceiver, Ham's worldwide have been forging ahead into the Future of Radio. Although not the only exploration into SDR, at that time, the SDR-1000 and GPL PowerSDR open source code has been a major engine to spur new exploration. Once again hams are at the very leading edge of radio. High Performance Software Defined Radio Project [HPSDR] Speaker: Lyle Johnson, KK7P The HPSDR is an open source hardware and software project intended as a next generation Software Defined Radio for use by Radio Amateurs and Short Wave Listeners . The design is modular, so an experimenter can choose the bits and pieces required to implement his own creation. This is similar to creating something from Lego blocks. The initial system consists of a motherboard/chassis to contain and power the modules, along with a few building blocks. Real radios have Knobs...One at least : The Picastar Project. Speaker: Harold Johnson, W4ZCB SoftRock40, Past, Present, Future Speaker: Tony Parks, KB9YIG About a year ago Tony, designed a small transceiver for 40 meters which derived, I and Q signals from a crystal, a pair of flip-flops and a transformer. Absolute inexpensive simplicity! Since then, Tony has produced and shipped thousands of kits worldwide. There appears to be no end in sight for this $14 dollar V.6 high quality receiver kit. Come hear what is in store next. Operating Digital Radio Mondiale with the SDR-1000 Speaker: Mel Whitten, K0PFX Digital Radio Mondiale (DRM) is now broadcasting digital programming with FM sound quality world wide. Rekindle your interest in shortwave listening using one of the finest receivers for DRM reception, the SDR-1000! A simple cookbook method will show you how to configure your SDR for optimum DRM reception of data, text and images using DREAM open source software. Experiments in transmitting DRM and the ham radio implementation of DRM (WinDRM) will be demonstrated. SDR for Emergency Communications Todd Collins - N2TUN Software defined radios can change parameters that in a hardware radio are inaccessible. Disaster communications require that robust, reliable networks be configured quickly with little or no pre-planning or coordination. SDR allows you to alter all parameters, automatically in response to changes in the environment. This ability (cognitive radio technology) is key to the wireless mesh concept, allowing the automation of physical layer parameters. The application of these technologies on the UHF and VHF bands by amateurs can create robust and surprisingly fast ad-hoc data networks. Saturday Evening. HOSPITALITY Suite hosted by FlexRadio Systems at the Crowne Plaza Hotel Bechel Room 7 P M Doors Open. Pay as you go bar, complimentary soft drinks and light snacks. Program begins at 8 PM moderated by Eric Ellison Welcome Introductions of key FRS personnel Presentation by Gerald [similar to town hall meeting. G will introduce a new radio prototype-don't get too excited it is still a work in progress.] QA with Gerald New Initiatives Volunteers for Flexer Award program, 2007 Dinner for Flexers [Hamvention], special QSL cards Wrap up-Eric2 Resume socializing Saturday evening activities will be played on TeamSpeak. Sunday inside exhibits open at 8 AM ATTENTION ! Attention! Attention! . We could use help manning the booth Friday through Sunday-especially Sunday. Booth activities include showing future Flexers how a SDR1000 works and sharing operational experiences. We look forward to seeing everyone. 73 The FlexRadio Team John P. Basilotto W5GI Marketing and Product Manager FlexRadio Systems
Re: [Flexradio] Interesting artifact
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 without antenna connected to the SDR-1000. In the normal listening it disappears under the noise coming from the antenna. 73, Ahti OH2RZ On 12/05/06, Tim Ellison [EMAIL PROTECTED] wrote: I observed an interesting phenomenon this evening and I wonder if my assumption is on track. When I started up my SDR1K this evening, I had it connected to a dummy load to do a little audio testing. On the Panadapter, I noticed a signal 500 Hz wide that was about -100dBm in intensity that sounded like a whistle. I could really hear it because the noise floor was about -138dBm. The signal never changed in intensity, but was rapidly increasing in frequency. I checked on another radio and the signal was definitely in the SDR1K. I started tracking it at around 14.190 KHz and followed it up the band. As it crawled up the band, the rate of frequency change decreased, but the intensity never did. I tracked it to all the way to 14.290 KHz where it finally stabilized its frequency change. This whole process took about 20 minutes to complete. At this point I started transmitting and the peak jumped to 14.335 KHz. Once I quit transmitting it started to drop again to stabilize around 14.328 KHz. So it looks like this phenomenon is very likely temperature dependent. Am I correct to assume that this phenomenon is related to DDS thermally instability?? If it is DDS related, shouldn't the intensity of this signal decreased in intensity as it stabilized or should this S5 signal always be here? Should this DDS noise be this strong in intensity? I am just trying to figure out if this is normal operation of do I have some other problem. Any comments and opinions are welcome. -Tim --- Tim Ellison mailto:[EMAIL PROTECTED] Integrated Technical Services http://www.itsco.com/ Apex, NC USA 919.674.0044 Ext. 25 / 919.674.0045 (FAX) 919.215.6375 - cell PGP public key available at all public KeyServers Skype: kg4rzy ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
