SBE SB-36 OPERATION MANUAL
down.
D. After a specific period of time, the "READ” Command switches to
the read-out potential. The operation of the input count is inhibited.
With no more inputs being applied to the RF counter chain, the last
count produced by each divider circuit (in the RF counter chain) is
retained. Their output stages are, in effect, a form of data storage.
E. When the "READ" Command is switched to the READ-OUT
potential, it also causes the "READ" gate to turn on the Nixie tubes.
The converted output states of the RF counter chain is displayed for
the duration of the READ-OUT potential.
F. The reset pulse reoccurs causing a recycling of events discussed in
paragraph 5.3.6, items A through E.
The previous sequence of events occurs at a rate faster than the
human eye can follow. Only the frequency display of the Nixie tubes is
perceived.
Operating in conjunction with the counter circuit in the SB-36
Transceiver are upper and lower band limit lights. The band limit lights
provide a visual indication to the operator when the transceiver VFO is
operating outside of a normal band. Table 5.2 shows the relationship
between the various bands in the SB-36 Transceiver and functions of
the band edge limit lights.
TABLE 5.2 UPPER/LOWER RANGE LIMIT LIGHTS
Band Upper Lamp Lower Lamp
80 m ON ON
40 m OFF ON
20 m OFF ON
15 m OFF ON
10 m (28.0 - 28.5 MHz) OFF ON
10 m (28.9 - 29.0 MHz) *1 ON ON
10 m (29.0 - 29.5 MHz) OFF ON
10 m (29.5 - 30.0 MHz) ON ON
(*1: Typo: Should be 28.5 -29.0MHz.)
5.3.7 Power Supply
The DC operating voltage for the SB-36 Transceiver are generated by
the companion AC power supply. The power supply consists of a
printed circuit board and miscellaneous electrical parts mounted in the
NoobowSystems Lab. Tomioka, Japan 2003 http://www.noobowsystems.com/ Page 28 / 56
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