Alteration of the R-326M into a transceiver. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Civil radio communications
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The block diagram of the conversion of the R-326M receiver for operation in the transceiver mode is shown in fig. 1. As a result of the analysis of the RPU data, it turned out to be possible to abandon the use of IF-2 in the SSB signal generation path, but in order to combine the passbands, it is necessary to use the same type of EMF in the receive and transmit paths.
(click to enlarge)
The 500 kHz signal is taken either from a smooth 500 kHz generator (in the case of using EMF-500S), or from a 500 kHz crystal oscillator (EMF-500N; EMF-500V). In the second variant, the frequency meter readings coincide with the frequency of the suppressed carrier, but 4 EMFs have to be applied (two in the receiving part, two in the shaper). It is possible to use only one (two) EMF with switching from RX mode to TX mode using two additional relays. All relays are located in compartments directly next to the switching points. Interblock connections are made with a thin MGFTE cable. When establishing, it is necessary to strictly control the DSB voltage supplied to CM1, due to the low voltage of the quartz local oscillator (210; 3300 kHz). The TX amplifier on KT610 and the push-pull emitter follower KT904, KT914 are made according to standard schemes.
The necessary alterations of the matching stage (U8) and the first mixer (IR2.206.004) are shown in Fig.2. Connections shown in dotted lines should be removed.
The introduction of RF gain control is shown in Figure 3. Resistors R1 are removed from amplifiers U2, U2, and a control voltage is applied to gates T2 through contacts K2.1.
Ris.3
To remake the RPU, I advise you to carefully study the technical description and diagrams of the radio receiver.
In conclusion, I express my deep gratitude to Andrey (RU4AA) for his help in developing and establishing this design.
Author: N.Popov (UA4APQ), Volgograd region, Serafimovich; Publication: N. Bolshakov, rf.atnn.ru
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