Telecommunications – Transmitter – Plural separate transmitters or channels
Patent
1986-05-22
1988-02-02
Ng, Jin F.
Telecommunications
Transmitter
Plural separate transmitters or channels
455114, 455125, H04B 104
Patent
active
047233060
ABSTRACT:
A wide band, transistorized power transmitter for the execution of radio traffic requires a filter arrangement consisting of a large number of sub-filters because of the insufficient linearity of the transmitter end stage between the output of the transmitter end stage and the transmitter output. Depending upon the adjusted transmitter frequency, in order to suppress undesired harmonics, one of the sub-filters is switched into the signal path. The relays normally used to switch on and off the sub-filter are unsuitable for carryout out frequency jump operation. By effecting a suitable sub-division of the sub-filters of the filter arrangement into two and more sub-filter groups, between which it is possible to carry out a rapid and non-abrasive switch-over by way of electronic power switches, it is possible without too high an expense to carry out a frequency jump interval which can be arbitrarily adjusted within the overall frequency range.
REFERENCES:
patent: 3546590 (1970-12-01), Covill
patent: 4234965 (1980-11-01), Bickley et al.
patent: 4521913 (1985-06-01), Huber et al.
"Wideband Linear Amplifiers in h.f. Communications" by Ling, Electronics Components and Applications, vol. 3, #4, 8/1981.
Fuenfgelder Helmut
Ochsmann Dieter
Zirwas Johann-Gerhard
Ng Jin F.
Siemens Aktiengesellschaft
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