Cross Country Wireless HF Preselector
Cross Country Wireless have released a HF Preselector.
This can be used to provide additional front end selectivity for HF and medium wave receivers protecting the receiver from strong out of band transmissions, wideband noise and other transmitters on multi-station field days.
As the sunspot cycle declines and more listening is done on the lower HF bands with long wire antennas and strong NVIS signals then the HF Preselector is an ideal accessory to aid receiver performance.
It is invaluable when using simple conventional superhet or SDR receivers such as RTL-SDR dongles with upconverters or SDRPlay with large HF antennas.
It is an ideal tool to reduce ADC overload on the Icom IC-7300 with the new InRad receive only antenna jack kit.
It can also be used with other transceivers that have sockets for a separate receiver input and receive antenna output.
It also covers the medium wave broadcast band for MW DXers.
The Preselector is a passive high Q design that does not use an additional amplifier or require external power.
Frequency tuning range: 0.5 to 55 MHz in five bands
Input impedance: 50 ohms
Output impedance: 50 ohms
Bypass option on switch
Galvanic isolation between input and output
Insertion loss: 2 dB
Selectivity: See HP network analyser plots below
Connectors: BNC female (RF in 50 ohms), BNC female (RF out)
Tough polycarbonate case
Overall dimensions: 125 mm (L) x 85 mm (W) x 55 mm (H)
Weight: 192 g
The PayPal button automatically adds 20% VAT if the buyer is in the UK or EU.
The HF Preselector FAQ sheet can be downloaded as a PDF file here .
The plots below were taken using a HP 8754A network analyser covering 3 to 40 MHz. The markers on the trace show 10 MHz steps.
The vertical scale is in 10 dB steps.
Click on the image to view a larger image.
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