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Summary of Contents for REUTER RDR54
- Page 1 Receiving Examples Digital Communication Measurement Receiver / Transceiver RDR54 / 50 Version: English First posted: 31/10/2012 Last change: 31/10/2012 ________________________________________________________________________________ Author: Dipl.-Ing. R.Menn...
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Page 2: Table Of Contents
Page 8 6.) CW reception and decoding Page 11 7.) DRM reception “Reuter” style Page 12 8.) Reception of a weak SW station right next to a strong one Page 13 9.) Reception of a multiple challenged station, LHASA 4820kHz,... -
Page 3: Introduction
An ICOM 8500 was used for reference in the 2m band. I nevertheless find that the Reuter RDR54 deserves a place in this line-up of top receivers. Its sound on AM with the Envelope-Detector challenges the legendary sound quality of the Collins R-390A while at the same time the endless filter bandwidth selection reminded me of a Perseus SDR. -
Page 4: Am Broadcast Band Station
1.) AM broadcast band station The display settings are chosen so that the signal can be seen well and an optimal listening experience can be guaranteed. Demodulator: AM-E(nvelope), 10 kHz Bandwidth, AGC limit –50 dBm (medium strong station) The station was received using a loop antenna, a good choice for this band. The next image shows the same station at the same time using a small active antenna, the SONY AN-1. -
Page 5: Am Reception With An Interfering Signal
2.) AM reception with an interfering signal In the upper part of the spectrum you see a dominant “whistler”, a typical small interference signal which will be heard as a loud constant tone. Using the sharp edged Notch Filter, we can blank out the unwanted signal without losing too much information of the passband. -
Page 6: Reception Of A Shortwave Station With A Strong Interference In One Sideband
3.) Reception of a shortwave station with a strong interference in one sideband Shown here is the signal of Radio Rebelde Cuba, 5025 kHz, as it can be received in the early morning hours in Europe. The lower sideband has a relatively wide interference which we can eliminate in a couple of ways. First, we can use the SYNC-mode and simply chose the Upper Side Band, thus engage SUSB mode (trivial, not shown). -
Page 7: Shannon Volmet 5505Khz With Interference
4.) SHANNON Volmet 5505kHz with interference Intentionally, the RDR54 was set to 10,000 Hz audio bandwidth. As you can see, the signal is displayed quite compressed, but the interference “hump” can be seen well. In this setting, the audio of the VOLMET is completely dominated by the interference. -
Page 8: Reception Of An Ndb And Decoding The Stations Id Using The Waterfall Diagram
5.) Reception of an NDB and decoding the stations ID using the waterfall diagram In Europe, you can receive a lot of NDBs (=non directional beacons) in the upper LW band. A local station broadcasts on 343 kHz. Set the display resolution from 1,280 to 320 to visualize the signal better. Now the two sidebands can be seen clearly. - Page 9 Switching to the waterfall display shows the spectrum as follows. The CW type sidebands can be seen, but the coloring is quite distracting. We now shift the color table so that the signal can be interpreted better (+62). It’s still the same signal, but we “desensitized”...
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Page 10: Cw Reception And Decoding
6.) CW reception and decoding For the CW signal (which is usually very weak) a combination of some of the RDR54’s unique features can be used to make the signal more intelligible. First, we use one of the highest display resolutions (160 or 320 pixel/unit), then shrink the bandwidth to a super narrow 320 Hz or even smaller. - Page 11 This will result first in a gargling sound, if we continue, the dashs and dots will be literally “punched” out of the noise which will make the CW signal very easy to understand. Again we use the waterfall display to verify our settings. A further adaptation of the color table (from “41”...
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Page 12: Drm Reception "Reuter" Style
7.) DRM reception “Reuter” style Nothing could be easier. Simply switch on the “IFIQ” demodulator when you see a signal like this on the RDR’s spectrum display. Turn down the loudspeaker’s volume completely. Connect the RDR’s headphone out to the soundcard input of your PC or laptop. In case of the latter, the settings for microphone sensitivity might be a little tricky (overall loudness, mic-amp engaged or “off”... -
Page 13: Reception Of A Weak Sw Station Right Next To A Strong One
(eg. a 12 kHz mixer board) nor a lot of settings to be changed in your PC or laptop. Simply allow the signal from the RDR54 to enter your soundcard and let DREAM do the trick. -
Page 14: Reception Of A Multiple Challenged Station, Lhasa 4820Khz, 20:30 Utc
VoA reception using the Synchronous detector and LSB as an option. Audio and sideband bandwidth set to 5000 Hz. VoA reception using DSB and a Passband shift of 4000 Hz to cut out the REE signal completely. Note that the bandwidth needs to be adjusted afterwards also. 9.) Reception of a multiple challenged station, LHASA 4820kHz, 20:30 UTC The reception of PBS Xizang,Lhasa-Baiding on 4820 KHz is challenged in many ways. - Page 15 Two het tones (3, 4) appear in the upper sideband, one 5kHz away from the carrier (4). Again, the RDR54 gives us some options to optimize the reception. The RTTY signal and the warbling sound can be cut out completely by using the Synchronous detector and USB as an option.
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Page 16: Reception Of Weak Signals Close To The Noise Ground On 2M
(seen from the antenna to the receiver) can show its merits. And this is where the RDR54/50 really shine. Seen here is a weak signal with medium modulation on 2m. The low axis setting is set at the median of the noise floor of the signal to emphasize the presence of weak signals and to eliminate the clutter of the negative valleys of the random noise. - Page 17 In this example of a strong local signal, the minimum signal level is raised so that we can make exact measurements and set the controls optimally. SQUELCH: There is no separate control for squelch operation. A squelch capability is important for listening to FM wide or narrowband signals.
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