Elecraft KPA100 Manual User Manual
Page 70
70
U4 is an RS-232 transceiver IC. It converts the 5V logic-level signals at
pins 11 and 12 (RX/TX data) to RS-232 levels, +/- 5 to +/- 12 VDC.
P1 is the interface connector between the K2 Control board and the
KPA100. The 12CTRL line (12 volts switched) is used to power the
KPA100 fan, relays, HV bias supply, RS-232 interface and SWR bridge.
This allows these circuits to be used and tested even if a high-current
power supply is not connected at J3.
See also other documents in the category Elecraft Accessories communication:
- KX3 Owner's Manual (58 pages)
- KX3 Assembly Manual (47 pages)
- KX3 Assembly Manual Errata (5 pages)
- KX3-2M (30 pages)
- KX3-PCKT (2 pages)
- KX3 Mobile Installation And Operation Guide (17 pages)
- KX3 Guide for Blind Operators (7 pages)
- KX3 Quick Reference (2 pages)
- K3 Programmers Reference (26 pages)
- KX3 Speaker Grille Instructions (9 pages)
- KXFL3 Filter Option (12 pages)
- KXFL3 Filter Option Errata (2 pages)
- KXAT3 (5 pages)
- KXBC3 (13 pages)
- KXPD3 (4 pages)
- Proset Boom Headset (1 page)
- PX3 Owner's Manual (53 pages)
- PX3 Owners Manual Errata (2 pages)
- KXPA100 Manual (55 pages)
- KXPA100 Assembly Manual (27 pages)
- KXPA100 Assembly Errata (1 page)
- KXPA100 Programmers Reference (24 pages)
- KXAT100 Installation Manual (17 pages)
- KX1 Manual (96 pages)
- KXAT1 (12 pages)
- KXPD1 (7 pages)
- KXB30 (8 pages)
- KXB3080 (20 pages)
- K1 (91 pages)
- K1 1.09 F/W (1 page)
- KNB1 Manual (8 pages)
- KAT1 Manual (15 pages)
- KFL1-2 (2 pages)
- KTS1 (1 page)
- KBT1 Manual (8 pages)
- KBT1 Manual Errata (2 pages)
- K1BKLTKT LCD Mod Kit (6 pages)
- K2 Owner's Manual (171 pages)
- K2 Owner's Manual Errata (1 page)
- K2 PLL (4 pages)
- K2ATOBKIT (15 pages)
- K2ATOBKT (2 pages)
- K2 Keying Modification Instructions (4 pages)
- KPA100 Shield Upgrade (3 pages)