Code-named " Rubin ", this system used an improved transmitter and receiver from " Zenit ", but had a single antenna, made possible by a device ( a duplexer ) personally developed by Truten.
42.
Any arrangement that efficiently uses the 108 MHz bandwidth in the frequency range 698-806 MHz must thus have more than one duplexer . Dual duplexer means that the handset has 2 duplexers, one per sub band as illustrated in figure 8.
43.
With the use of a dual duplexer arrangement the individual duplex spacing will be increased, providing at the same time more usable spectrum for FDD . With current technology it would not be possible to implement a passband of 50 MHz with a single duplex solution.
44.
Implementing this attenuation requirement is a simple matter with the suggested 2x50 MHz arrangement by the use of a dual duplexer because the own UL and DL bands are separated by much wider separation distance the 8 MHz that would have been the case if a single duplexer is applied.
45.
Implementing this attenuation requirement is a simple matter with the suggested 2x50 MHz arrangement by the use of a dual duplexer because the own UL and DL bands are separated by much wider separation distance the 8 MHz that would have been the case if a single duplexer is applied.
46.
She returned to the United States at the end of the war, and began taking on patrol and training duties . " New York " was fitted with XAF RADAR in February 1938, including the first United States duplexer so a single antenna could both send and receive.
47.
There are two predominant types of duplexer in use-" notch duplexers ", which exhibit sharp notches at the " unwanted " frequencies and only pass through a narrow band of wanted frequencies and " bandpass duplexers ", which have wide pass frequency ranges and high out of band attenuation.
48.
An improved system, designated " JB-3 ", was built at the BPI; the most important changes were the use of a transmit-receive device ( a duplexer ) allowing a common antenna, and an increase in frequency to 120 MHz ( 2.5 m ).
49.
Engineers at the NII-20, with the cooperation of NII-9 in Leningrad, further improved the " RUS-2 ", developing a transmit-receive device ( a duplexer ) allowing a single antenna, as well as a range display based on a cathode-rayoscilloscope.
50.
This is usually to enable two signals to be transmitted simultaneously on the same communications channel, or to allow transmitting on one frequency while receiving on another . ( This specific use of a diplexer is called a duplexer . ) The same device can be used to separate the signals again at the far end of the channel.
