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RARE DX under QRM ? Dig it out with this Tunable Audio Notch Filter
between your receiver and extension speaker or headphones, BOOST your
DX/QRM ratio, 40 dB notch, WINKLE out the WEAK DX from under
tiring whistles and cw interference FAST - when interference starts
just notch it out and carry on DXing. Set to 5kHz for hiss and splatter.
Its built-in speaker amplifier maintains the gain and sharpens the notch
so that the resulting "hole" has little effect on speech.
TYPICAL PERFORMANCE. Notch frequency range 350 - 5000 Hz, notch depth 40dB,
20dB bandwidth 150Hz at 1kHz, unity voltage gain, input resistance 10k ohms,
output resistance 1 ohm, power output 0.1W (12V, 8 ohm load),
supply needed 9-15V at 50mA, controls for tuning and notch/flat
(bypassed when off),
4 x 7 x13 cm, 200 g.
| "heterodyne disappeared completely", Practical Wireless. |
| "fully compares with other makes at much greater prices", HHA
in Accrington. |
| "impressed at the ease with which I can tune out an annoying heterodyne",
Practical Wireless. |
| "...it works 100%",
JV in Aberdeenshire. |
| "excellent quality and value",
JD in Berkshire. |
This fun-to-build kit used to include all parts, tinned drilled fibre-glass pcb, case, connectors, screws etc
as well as detailed assembly and operating instructions including circuit description and diagram,
and was priced at £22.20 including VAT and UK postage.
Please e-mail martincambridge@live.co.uk
for the latest price reduction, details of payment and any extra parts now neeeded.
2021 April 10 David Smith We would like to help you but your email box is full
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