Schematics > RF circuit > MK414 SW Receiver
MK414 SW ReceiverDescription:
A Short Wave Receiver based on the MK484 (formerly ZN414) that includes the
tropical bands and 49 metre bands.
MK414 SW Receiver circuit
Notes:
The original data sheet for the MK414 states a maximum working frequency is
around 4 MHz. SW transmissions are so powerful that this receiver will work well
with signals up to about 6 or 7 MHz. The 10k resistor controls the operating
voltage for the IC which is critical for good performance.
Coil Details:
The tuned circuit consists of a variable capacitor and fixed air spaced coil.
For the coil, I wound between 10 and 20 turns of wire on an empty tube of around
1.5 inches diameter. The turns were spaced so that the overall length was around
3 inches. The variable capacitor tuned 0 - 300 pF but there is plenty of scope
for experiment here. One final point, you will need an external antenna to
receive broadcasts. I have an outside wire that is about 7 meters long and this
was quite effective. The antenna can be connected at either end of the coil or
via a series capacitor value between 10pF and 100pF.Circuit :
Andy Collinson
Email: anc@mitedu.freeserve.co.uk
Title: MK414 SW Receiver
Source: unknown
Published on: 2006-01-15
Reads: 755
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