Elecraft T1 ATU Owner's Manual - Manual (Page 7)

7
Additional Operating Features
The switch on the right (S2) provides access to three additional functions. These are described below.
Bypassing the ATU (L and C set to 0)
• Tap PWR/TUNE; the yellow LED will flash.
• Tap BYP/INFO to alternate between ATU in-line (green LED on) and bypassed (yellow LED on).
• When bypassed, the T1 can still show SWR; activate TUNE mode, then key the transmitter.
This is especially useful when adjusting backpacking or mobile antennas to resonance.
INFO Report
The last SWR reading, battery voltage, and other information can be obtained using the INFO feature.
• Tap PWR/TUNE; the yellow LED will flash. Hold BYP/INFO for about 1 second, then release.
• The T1 will send several parameters in slow Morse code on both the yellow LED and via a weak
RF signal (see page 11). “R” (radix) is used in lieu of decimal points. Parameters sent include:
Sx SWR (e.g., S1R0 = 1.0:1)
Vx Battery voltage (e.g., V9R0 = 9 volts)
Lx Inductance in H (e.g., L1R45 = 1.45 H)
Cx Capacitance in pF (e.g., C330 = 330 pF)
Nx Network configuration (NT = K8 set to “TX”, NA = K8 set to “ANT”)
Bx Band ID: B0, no band data; B1-B11, 160-6 m; B12, over 6 m (L & C set to 0)
Fx Firmware revision (e.g., F1R06 = revision 1.06)
• The report can be cancelled by holding PWR/TUNE for about 1 second.
L-Network Testing
The T1 includes a test mode that’s useful for troubleshooting relays and L-network components (also see
page 10). To use test mode:
• Tap or hold PWR/TUNE. The yellow or green LED will flash.
• Hold BYP/INFO for over 4 seconds, then release. “L0” will be sent in slow CW on the yellow
LED, showing that L = 0 (C is also set to 0). A test-mode “heartbeat” will flash on the red LED.
• Tap BYP/INFO to select L1; “1” will be sent on the yellow LED. Further taps select L2, L3…L7.
• Hold BYP/INFO to switch to C; “C0” will be sent. Tapping BYP/INFO selects C1, C2…C7.
• Hold BYP/INFO to select N (net relay); “NT” will be sent (C TX). Tap to select “NA” (C ANT).
• Relays can also be controlled by sending binary data via J3. Use the TUNE and DATA timing
shown in Figure 3. Send 0000 to reset all relays, and 0001-1111 to set K1-K15 respectively.
Once any relay data is sent via J3, you’ll need to use only this method, not manual selection.
• Connect a sensitive SWR bridge between the T1 and transmitter to test components (page 10).
Tap PWR/TUNE to exit. (Note: In TEST mode, the T1 turns off after 60 seconds of no activity.)