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Preselector 10Khz-600 Khz

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I have added this simple preselector to my RX. (from LF today - RSGB publications)

Advantages : parts are easy to find  - it is easy to build - verry efficient to pick up little signal in a verry small bandpass.

Inconvenients :if you want monitoring a large bandpass with your SDR, the signals outside de BP of the filter are excluded : the best way is then to include a bypass position (use then a 6 position rotary swich), first bypass the whole preselector, pick the wanted signal , and then tune it using the other postions of the rotary switch.

 presel

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WSPR signals on 630m band

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Received RX signals on 630m with the PA0RDT active antenna.

WSPR ON8IM 002

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Reception of DCF49 signals

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Affichages : 15172

F(rx) = 139.000 Khz

Decoder : multipsk mode ASCII 8bits shift 200 Hz + IEC 870-5 decoding

DCF49

 BUT !!!

Decoding the frames is much better (merci ON4MS)

frames dcf49

 

SAQ Grimeton Radio Message on 17200 Hz for the UNDay 25 october 2015

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ON8IM Grimeton thumb

Here next you will find the decoded CW message transmitted on october 25, 2015 by the station SAQ using the Alexanderson alternator.

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Weather forecast on 147 Khz

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Affichages : 15619

All infos here are coming from : http://weather.mailasail.com/Franks-Weather/Radio-Teletype-Weather-Broadcasts

In Western Europe and the Mediterranean, the Deutscher Wetterdienst (DWD), the German Weather Service have the responsibility to broadcast Weather information for mariners on RTTY.

Frequencies table see below :

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Alfa navigation VLF signals

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Affichages : 13043

Received Alfa navigation signals at 11.905 kHz, 12.649 kHz, 14.881 kHz. Click on the picture to enlarge.

ON8IM VLF thumb
 

Wat are Alfa Navigation signals ?

The ALPHA / RSDN-20 radionavigation system is transmitting a 3.6 sec long repeating sequence consisting of six 400 ms long frequency combinations with a 200 ms spacing.

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WSPR signals on the 2200m band

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Affichages : 9557

WSPR ON8IM 004

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Réception WFAX avec le programme FLDIGI

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Affichages : 8112

 

Réception en mode WFAX avec FLDIGI

image002
 

Fréquences de réception fax en KHz avec un signal correct :

Northwood England : 2618.5 4610 8040 11086.5 18261
Hamburg Germany : 3855 7880 13882.5
Athens Greece  : 4481 8105
Roma Italy : 4777.5 8146.5 13597.4
Sklamlebaek, Danemark : 5850 9360 13855 17510

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  1. JIT65-HF
  2. Antenne Beverage à 1 conducteur

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VLF

  • ANTENNES ACTIVES
  • Active antenna PA0RDT
  • Antenne PA0RDT : les fondamentaux
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  • A 10kHZ - 600 kHz preselector
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