Wednesday, January 6, 2010

SDR-Receiver tests Part II

I did some more tests and search of the latest SDR-radios & softwares during the Holiday Season. It seems there are something going on on several receiver / software manufactures on SDRs just now.


This is a nice piece of software which obviously is in the development stage, but versions that I tested worked quite OK with a SDR-IQ-receiver. Obviously this is more intented to HAM-operators and IQ-compatibility is only one of the features of this softaware. The highlights of this are an integrated MP3-recorder and easy connectivity into Internet and remote use of the receiver (like IQ). However I could not find a good possibility to measure the exact carrier frequency like using the SpectraVue-software ( see earlier post "Part I" recarding the latest SpectraVue 3.03). More about SDR-RADIO on their web-pages.

SDR-IP and SpectraVue 3.03

It seems the release of the new SDR-IP-model will be in Q1 2010 and the current softaware version of SpectaVue 3.03 seems to support 2 Ms/s samplerate to achive IQ-recording of 1.8 MHz with the resolution of 0.95 Hz. The resolution enhancement is important to all of us who wants to really see and measure the carrier frequency to the last Herz. This feature have been discussed many times earlier (see the archives of earlier posts) as it is often important to visually examine the spectrum of several carriers on the tuned frequency. The latest version of the manual does not mention the support for Perseus (or other IQ-recordings) - as it was on an earlier version - an issue discussed sometimes with earlier versions of SpectraVue. It is very understandable for the software designer just to support RF-Space products. As of IP IP-board some other interesting options are at least: support for down converter of 88-108MHz (an internal 10 MHz locked downconverter).The SDR-IP utilizes straight TCP/IP and ethernet for all communications. This offers the highest possible performance due to the highly optimized ethernet drivers on PC, Mac and Linux systems. So different Operating Systems are supported. The 1.333 Mhz sample rate gives a very convenient 1.2 Mhz output (IQ) bandwith – just suited for a MW-dxer. At that sample rate the resolution is about 0.6 Hz. Let´s see when we get some real world tests of the new IP-model!

Win Radio - new model !

I was a bit surprized to get to know that also WinRadio has released a new model "coming soon". The presented Excalibur model seems to have a few interesting features like three independent channels (i.e. three receivers in one), all parameters can be set separately for each channel. Each channel can also record audio simultaneously and independently. Recording and playback are also provided at the output of the Digital Down-Converter, where an entire 2 MHz spectrum band can be recorded for later demodulation (seems to be real IQ-recording, not the "IF"-as in earlier models). The recording facility also features pre-buffering to avoid a loss of signal at the start of a transmission. A flexible Scheduler function makes it possible to program each channel separately, for unattended recording on preselected frequencies, at specified dates and times. There are not yet more information of the scheduler. However according to specs I have found that the maximum resolution is only 1.5 Hz which is not as good as that of Perseus or SpectraVue softwares. As there are no more pictures or information, you can not say if the carrier frequency can be "seen" exactly or measured by the software automatically. More information will be seen in the near future I hope.

So it seems this year we will see more happening in the field of constantly developing receivers!

1 comment:

  1. great news about the FM Coverage,
    I'd love to be able to swap FM recordings like we swap MW files even if its just 1.8mhz of band it would still be interesting