2012-04-04, 22:24 | #16 |
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Looks like the problem could be the bandwidth of the 455 kHz IF filter in your receiver? Any idea what the type number of the filter is? I just happened to listen to AIR this evening. Enclosed is a screen shot of the output from my FRG-7700's 455/12 kHz converter. By the way, the 12 kHz IF does not necessary have to be exactly 12000 Hz to get Dream to work.
My log is on the 9950 thread. |
2012-04-04, 23:11 | #17 |
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No I don't know the filter, but Eton advertise the IF as being for this sort of purpose, I will email them, am I the first person to try this receiver for DRM I wonder, I'm using Crispinos down convertor board thanks for your help, I will persevere
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2012-04-05, 03:46 | #18 | |
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Quote:
are you using mic jack of pc/laptop? To be able to decode audio, snr should be 11 or higher.
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Regards, Sarma ------------------ Elektor SDR 5/07- Elektor Preselektor - Miniwhip Antenna of PA0RDT Last edited by mvs sarma : 2012-04-13 at 06:58. |
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2012-04-05, 07:24 | #19 |
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I think the Eaton S450 looks very much the same as my Roadstar TRA-2350P which I use when I am in Sweden. See it here: http://omnirep.se/drm/roadstar.html It works rather well on most bands if you set the AM RF Gain roughly to the middle ("5").
Be sure to set the Band Width switch to "W" if you haven't done so already. "N" is too narrow for DRM. And, if you have the possibility, set the EXT/INT Antenna Switch to EXT and connect a shielded cable to the antenna connector and throw a wire out the window or better, into the garden. All my "@SE" logs from March 2012 were received with that radio. Good luck! PS: I use the Band Pass Filter in Dream, but the difference is not that much different if you don't. Last edited by Digger : 2012-04-05 at 09:21. |
2012-04-05, 07:48 | #20 |
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Thanks for your comments, I didn't spot the filter checkbox and having slept on it realise the SNR was too low, I had dragged up all the noise by winding the rf gain right up, I was only on the internal whip, so a good aerial will be sorted, back to the basics of good SW reception, I have an RF systems mini windom which I will rig up and report back. Again thanks to you folks for your help, the Eton seems to work quite well, very good value.
Regards Ian |
2012-04-10, 22:43 | #21 |
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Ok I have 12dB SNR on 9950 but still no Green MSC with Degen aerial, will try with a better aerial
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2012-04-11, 07:04 | #22 |
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Hi Ian,
Was that with the AC adapter or with internal batteries in the Eton? Forgot to mention that I always use my Roadstar with a separate DC Power Supply. |
2012-04-11, 08:12 | #23 |
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Hi
All on batteries, I noticed laptop power supply is very noisy, will try a rig up along wire and atu |
2012-04-12, 22:08 | #24 |
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Finally have some audio, with a longwire and 15.4dB SNR, more aerial work to do I feel, thanks folks
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2013-01-16, 22:10 | #25 | |
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crystal resonators
Quote:
if resonators are available in 5 kc steps ... so you can use 460 or 465 ... whatever fits best wizh your real if (and some detuning of the resonator with a cap maybe) ... dream syncs faster if you also set the real frequency (say it is 12kc) and narrow the search window to maybe only 200hz ... then dream locks much faster sigi
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best 73´s de DG9BFC, Sigi DRM-RX = ICOM IC-765 with Mixer by Sat-Schneider, HCJB Pappradio by Stephan Schaa Antennas = 170m Deltaloop, Vertical 10m w. 1:9 unun, 10m (short) longwire w. 1:9 unun |
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2013-01-16, 22:23 | #26 | |
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Quote:
you search a commercial downmixer?!? i bought mine on hamfest from sat schneider http://www.sat-schneider.de/DRM/DRM.htm (there you find also other software and nice info about drm) or why not build it yourself ?!? just a few parts on a "breadboard" sigi
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best 73´s de DG9BFC, Sigi DRM-RX = ICOM IC-765 with Mixer by Sat-Schneider, HCJB Pappradio by Stephan Schaa Antennas = 170m Deltaloop, Vertical 10m w. 1:9 unun, 10m (short) longwire w. 1:9 unun |
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