radio path of the transceiver. Scheme, description

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radio path of the transceiver. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Civil radio communications

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This block is intended for use in a transceiver with a single frequency conversion. A quartz filter is used as the main selection element [1].

Fig.1 (click to enlarge)

In the receive mode, the GPA signal is applied to the winding 1 of the transformer T1. At the connection point of the windings II and III of this transformer, a signal is supplied from the band-pass filters. On diodes VD1 - VD4, having assembled the first balanced mixer. The IF signal (2 MHz) selected on the L1, C9,05 circuit is amplified by the first IF stage (VT1), filtered by a quartz filter, amplified by the second IF stage (VT2) and then enters the second balanced mixer. It also receives a signal from a reference quartz local oscillator (9,05 MHz). The LF signal is fed through the Dr2S20 to the ULF. An AGC cascade is assembled on the VT3 transistor. R18 adjusts the IF gain. In the transmission mode, relays K1 - K3 are activated. In this case, the signal from the reference quartz local oscillator (1 MHz) is applied to the winding 1 T9,05.

A signal from a microphone amplifier is fed to the midpoint of the winding T1. Carrier suppression is carried out by adjusting the resistor R1. The DSB signal is amplified by transistor VT1. The quartz filter highlights one sideband. The amplified SSB signal (transistor VT2) is fed to the second balanced mixer. The GPA signal is also supplied here. From the midpoint T4, the signal enters the FSS radio frequency of the corresponding range.

Radio path of the transceiver
Relays - mode switches

Radio path of the transceiver
microphone amplifier

Winding data are given in table. one.

Designations according to the scheme	Number of turns	Wire brand	frame	Core	Note
L1	10	PELSHO-0.16	5 mm	from SB-12	Over L2
L2, L3, L5	29	PELSHO-0.16	5 mm	from SB-12	coil to coil
L4	15	PELSHO-0.16	5 mm	-	Over L3
L6	10	PELSHO-0.16	5 mm	-	Over L3
T1 - T4	10 + 10 + 10	PELSHO-0.24	K7x4x2	2 rings 50 HF	coil to coil
Dr1, Dr2, Dr3	180	PEL-0.16	MLT 0.25 1 MΩ	-	in bulk

A drawing of a printed circuit board and the placement of parts on it are shown in Fig. 2

Literature

1. The best designs of the 31st and 32nd exhibitions of radio amateurs in 1989. Transceiver "Ural-84". - M.: DOSAAF USSR, S.61.

Author: V.Rubtsov (UN7BV ex UL7BV), Tselinograd, Radio Amateur 2/94, p.48-49

See other articles Section Civil radio communications.

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