Introduction KPA500 Compact 160-6 M Solid State Amplifier Available as a Factory Assembled or Modular No-Soldering Kit.  The KPA500 is also compatible with most popular rigs. Add more punch to your signal with Elecraft's KPA500/KAT500 PowerCombo!  Learn more here. Overview OVERVIEW 500+ Watts in a compact package The 500-watt solid-state amp that integrates so well with your station (most HF Transceivers), you’ll think it's reading your mind.   The KPA500 features 160-6M coverage, instant RF-based band switching with any radio, alphanumeric status display, bright LED bar graphs, and a rugged, internal linear supply. The amp’s manual band switches may be used to directly change bands on the K3 and K4 Transceivers.  Additionally, the K3 and K4 can automatically select per-band amplifier drive levels when the amp is placed into operation mode, so you’ll rarely need to adjust the power output. But the KPA500 is not just limited to use with  K3s and K4s – it is fully compatible with most radios. (Only amplifier keying (PTT) and RF are required for operation, including instant RF frequency sensing, fully automatic band switching.) KPA500 Features: 500W, Compact, Solid State FET amplifier for 160-6 m Works and auto band selects with any radio that provides Key-Out and RF signals. 26 lbs, 12 kg Internal low noise linear power supply: 100-120, 200-240 VAC, 50/60 Hz operation Instant-on operation Rugged, conservative design with smart soft and hard fault detection Intelligently reduces power by 2.5 dB temporarily when presented with input overdrive or a high SWR, allowing you to quickly reduce your drive to compensate without dropping the amplifier off-line. The amp automatically recovers to full power once the soft fault condition is corrected. Excessive overdrive or SWR events instantly place the amp safely into protective stand-by Works with any radio that supplies PTT to Ground Ultra high speed QSK. Silent, diode switched T/R Super fast RF sensing band selection. Only PTT and RF are required for fully automatic band changing operation. Can receive band data information from most radios that supply it Fully remote controllable Six speed temperature sensing fan Advanced integration with the K3 and K4 Transceivers using the optional KPAK3AUX cable KPA500 band buttons drive the K3 and the K4 Transceiver band and drive level Band data is sent from K3 and K4 Transceivers to KPA500 before TX PTT included in cable, external PTT cable not required The K3 and K4 Transceivers sense the KPA500 operate/standby state and adjust drive power between two memorized levels on each band. K3 and K4 Transceivers can also provide two different output power levels for when the KPA500 is in Operate or in Stand-By/Off mode. Available as Factory Assembled, or as a Modular, No-Soldering Kit Cables for Other Radios Cables for Other Radio Brands/Models Elecraft Cable # Transceiver Model Notes E100416 (Included w/ Amp) Phono Cable works with most radio models.  Please Select additional cable(s) below based on desired operating mode. Standard Mode – Keying.   Phono Keying Cable included with Amp.  Amp/ATU selects band and freq. by using its internal frequency counter to measure TX freq. in this mode. Works with all radios with a keying output phono jack. KPAK3AUXSET K3, K3S Enhanced Mode. Aux Cable set for KPA500 AND second E850463 aux cable for KAT500. AUX Cable Set incl: 15-Pin to 15-Pin DE-15 + Key Line Interrupter adapter. Cables for non-Elecraft Transceivers Yaesu Cable # Yaesu Model Notes E100416 (Included w/ Amp) Phono Cable works with most radio models.  Please Select additional cable(s) below based on desired operating mode. Standard Mode – Keying.   Phono Keying Cable included with Amp.  Amp/ATU selects band and freq. by using its internal frequency counter to measure TX freq. in this mode. Works with all radios with a keying output phono jack. CBL-YAESUKEY FT-817, FT818 Standard Mode – Keying.  Incl. 8-pin MiniDIN to phono CBL-YAE-BANDKEY FT-920, FT990, FT1000 family, FT2000, FT5000, FT9000 family Intermediate Mode. Incl. 8-pin DIN to DE15 cable for band data plus keying, plus Aux Cable to connect the KAT500 to the KPA500. CBL-YAE-BKMINI FT857, FT891, FT897, FT991, FT710 AESS Intermediate Mode. Incl. 8-pin MiniDIN to DE15 cable for band data plus keying, plus Aux Cable to connect the KAT500 to the KPA500. CBL-YAE-BKDIN10 FT450, FTdx1200, FTdx10 Intermediate Mode. 10-Pin MiniDIN to DE15 cable for band data plus keying, plus Aux Cable to connect the KAT500 to the KPA500. CBL-YAE-BKDA15 FTdx3000, FTdx101 Family Intermediate Mode. DA15 to DE15 cable for band data plus keying, plus Aux Cable to connect the KAT500 to the KPA500. Icom Cable # Icom Model Notes E100416 (Included w/ Amp) IC7300, 7600, 7700, 7851, 9100 Standard Mode – Keying.   Phono Keying Cable included with Amp.  CBL-ICOMKEY Icom "small" radios: IC703, 706, IC7000 Standard Mode. ICOMKEY to KAT500. Use Phono cable from t