User Manual

Contents:
Sec Topic Page
1 HB Helical Resonator Bandpass Filter Description (50W HB only)31-1
2 HB Low Power Bandpass Filter Description......................31-3
3 LB Low Pass & Notch Filter Description........................31-4
4 RF Directional Coupler Description............................31-5
List of Figures:
Fig Title Drawing Reference
1 Bandpass Filter response...........................text, page 31-2
2 Bandpass Filter schematic..........................text, page 31-3
3 RF Directional Coupler schematic....................text, page 8-6
4 Generic Helical Resonator Bandpass Filter Assembly...30C1064 sht 2
5 High Band Bandpass Filter Assembly....................20B704 sht 1
High Band Bandpass Filter Schematic...................10A769 sht 1
6 Low Band Bandpass & Notch Filter Assembly............20B1118 sht 1
Low Band Bandpass & Notch Filter Component locations.20B1120 sht 1
7 Low Band Bandpass & Notch Filter Schematic...........20B1151 sht 1
8 RF Directional Coupler Assembly.......................20B534 sht 4
Low Band Coupler PC Board Assembly...................10A1942 sht 1
1. 30C1064G1 Helical Resonator Bandpass Filter (used with 50 watt High
Band):
The helical resonator was developed during the late 1950's and first described in
"Proceedings of the IRE" magazine by W. W. McAlpine and R. O. Schildknecht,
"Coaxial Resonators with Helical Inner Conductor," Proceedings of the IRE, vol.
47, no. 12, pp. 2099-2105; December, 1959. The same authors later published
another magazine article "Helical Resonator Design Chart," Electronics, p. 140;
12 August 1960.
IRE stood for the "Institute of Radio Engineers" which was responsible for some
of the television transmission standards that remain in use today. IRE later
merged with the "American Institute of Electrical Engineers" to become the
"Institute of Electrical and Electronic Engineers" which is known to us as the
"I-triple-E" and which continues publication of important electrical and
electronic engineering research papers in the "Proceedings of the IEEE" and in
the "IEEE Transactions" dealing with electrical and electronics interests.
We generally avoid such papers in our manuals except for the rare instance where
critical information is involved, as the content of most of these publications
are considered to be excessively arcane and esoteric for the beleaguered
technician whose sole interest is to get the transmitter back on the air. Should
you wish further information, we refer you to the above cited publications, to
"Reference Data for Radio Engineers, sixth edition" published by Howard W. Sams &
Co., and to the "ARRL Radio Amateur's Handbook" published annually by the
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