I decided to design a
multi band SSB Transceiver using common components and to cover from 80m to 10m bands (because i
have only a vertical 5band antenna).
The circuit is simple Q1-Q2 2N5109 is used
as Rf Preamplifier and Post Mixer Amplifier, MC1350 as IF Amplifier and NE612
as Product Detector. A MiniCircuits ADE-1 mixer was used as RX Mixer.In front
of the receiver there is an attenuator for strong local signals. The
R15-R16-R17 attenuator adjusts the impedance with the XTAL Filter and the
X1-X2-C23 crystal filter reduces background noise. At the end IC3 NE5534 and Q3
are the AF Preamplifier and Mute control.
 |
| Receiver Circuit |
I rewind the IF1 (max 4μΗ) and
remove the capacitor.
R1-R2-R3 attenuator -10db.
R15-R16-R17 attenuator -3db Z=200Ω
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