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1750Hz tone generator module
1750 Hz tone generator module In german amateur radio usually only Tone I (1750 Hz) was used to activate relay stations. A continuous transfer of these relay stations is usually not permitted. Therefore the transmitter of the relay...
PTT Sequencer ED 70 c module
... the timely and step shaped transmit-receive switch When simultaneously turning off the antenna preamplifier and turning on the coaxial relay, the amplifier and the transceiver by the usual PTT control, the following serious errors...