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2 Phased Verticals Array 40m

Details: Hits: 1925

I build last week a Bazooka vertical for the 40m (see link here) with good results.

This inspired me to build a second one and implement a two phased vertical array system.

I have chosen for a Christman phasing system : simple and easy o build

ON8IM Christman

Reception of DCF49 signals

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F(rx) = 139.000 Khz

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

BUT !!!

Decoding the frames is much better (merci ON4MS)

1/4 Vertical bazooka antenna for the 40m

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I needed a omnidirectional antenna for the 40m.

Here is the schema of the antenna :

on8im vertical 40m

Weather forecast on 147 Khz

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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 :

LF-MF preselector for my TS-2000 + active antenna

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The sensitivity of my TS-2000 below +/- 1500Khz dops dramaticaly.

I installed a preselector with a range from 10kHz to 600kHZ + a PA0RDT active antenna on the RX dedicated input of the transceiver.

This dedicated RX antenna is located on the rear of the transceiver (RCA connector nr 15) and is be activated in to the menu on item 18.

TS 2000 rear

Here is the schema

WSPR signals on the 2200m band

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WSPR ON8IM 004

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.