D. ANT 4 position can be coax, single wire or balanced. ANT 1, 2, or 3 coax only.
4. The SWR bridge power meter is in the circuit at all times, even in BYPASS position.
5. Apply +11 to 13.5 V dc for the panel lights.
OPERATION
MATCHING
1. Always use the minimum transmitter power necessary to operate the SWR/POWER meter. To
do this, set the meter switches to REV and SWR and turn the SWR SET to full CW position.
2. Set the CAPACITOR to 2, the INDUCTOR to full scale, and S1 to 50 ohms BYPASS.
3. Apply enough transmitter drive to obtain a half-scale meter reading.
4. Switch to either side of the BYPASS position to determine which results in a lower meter
reading and leave it there.
5. Alternately adjust the CAPACITOR and INDUCTOR for lowest meter reading.
6. If the CAPACITOR shows best meter null at 0, turn S1 to other side of 50 ohms BYPASS.
7. If the best meter null is with the CAPACITOR at 10, turn S1 to the next higher position.
8. Once a null reached, to determine is sufficiently low, set the meter switches to FWD and SWR
and adjust the SWR SET control to the full scale SET mark. Switch back to REV and read the
SWR on the lower meter scale. A reading less than 1.5 is usually acceptable.
9. It is convenient to record the control settings for each antenna and band. Tune-up on a given
band will be simplified by having the settings already established.
ANTENNA SELECTION
A maximum of four antennas may be connected to the model 229 at one time, only one of which
may be a wire fed antenna. Whether the antenna selected is matched or fed directly is determined by
the setting of S1. The 50 ohm BYPASS position bypasses only the mathcing network, leaving the
SWR/POWER meter in line.
Antenna position 4 feeds ANT 4, SINGLE WIRE or, with jumper installed, BALLANCED LINE. Only
one antenna, coax, single line or balanced line feed, may be attached at one time to these outputs;
otherwise the antennas will be fed in parallel and the lowest impedance antenna will receive the most
power. When using either ANT 4 (coax) or the SINGLE WIRE terminal, do not connect the jumper
between SINGLE WIRE and one BALANCED LINE terminal as damage to the balun may result.
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