ELECRAFT K3S - RECEIVER (Main and Sub); TRANSMITTER

9
RECEIVER (Main and Sub)*
Sensitivity (MDS)
(Typical values, in
500 Hz bandwidth)
HF, Preamp off: -133 dBm. Preamp 1: -138 dBm. Preamp 2 (12/10/6 m): -145 dBm.
Reduced sensitivity near 8.2 MHz (first I.F.) and from 44-49 MHz. Sensitivity
decreases gradually below 1.8 MHz due to intentional high-pass response at the T-R
switch. (Use RX ANT input, XVTR IN, or sub receiver’s AUX input to avoid the
high-pass filter loss.) Note: KBPF3A option required for full general coverage
(including 100 to 1700 kHz). Sensitivity falls off below 200 kHz; MDS typically
-115 dBm at 137 kHz (2200 m band) using RX ANT IN or XVTR IN.
Dynamic Range
IMD3 at 5 and 20 kHz spacing, 500 Hz BW: ~100 dB. Blocking: ~140 dB.
Image and I.F. Rejection
> 70 dB
Audio Output
2.5 W per channel into 4 ohms; typ. 10% THD @ 1 kHz, 2 W
S-Meter
Nom. S9 = 50 µV, preamp 1 on; user-adjustable
Preamp
Preamp 1 (all bands): 10 dB; preamp 2 (12/10/6 meters): 20 dB
Attenuator
Main receiver: 5/10/15 dB levels, settable per-band. Sub receiver, 10 dB.
Noise Blanker
Adjustable, multi-threshold/multi-width hardware blanker plus DSP blanker
Receive AF graphic EQ
+/- 16 dB/octave, 8 bands
Filter Controls
IF Shift/Width & Lo/High Cut with automatic crystal filter selection
* Receive specifications are guaranteed only within ham bands. Dynamic range measurements based on 400-Hz, 8-pole
filter. See www.elecraft.com for full list of available crystal filters.
TRANSMITTER *
Output Power
K3S/100: 0.1 W –100 W typ. Suggested max from 51-52 MHz, 85 W; 52-54, 70 W.
K3S/10 (or K3S/100 with PA bypassed): 0.1 W –12 W, HF-10 m; 8 W max on 6 m.
XVTR OUT: HF, -10 to +1.8 dBm; at 472 kHz (630 m), -3 dBm (see pg. 41).
K144XV: ~10 W, 144-148 MHz.
Note: K3S/100 output can be set up to 110 W. However, IMD and spurious products
are specified at 100 W, the recommended maximum (lower on 6 m; see above).
Duty Cycle
CW and SSB modes, 100% 10-min. 100W key-down at 25 C ambient
True RF Speech Processor
Adjustable compression
Transmit AF graphic EQ
+/- 16 dB/octave, 8 bands
SSB TX Bandwidth
4 kHz max (> 2.8 kHz requires 6 kHz or 13 kHz crystal filter)
VOX
DSP-controlled, adjustable threshold, delay, and anti-VOX
Full and Semi CW Break-In
Adjustable delay; diode T/R Switching
SSB Carrier Suppression
> 50 dB
Harmonic / Spurious Outputs
> 50 dB below carrier @ 100W (> 60 dB on 6 meters)
CW Offset/Sidetone
300-800 Hz, adjustable (filter center frequency tracks sidetone pitch)
Mic Connector
Front panel, 8 pin; rear panel 3.5 mm; switchable DC bias
* Transmit specifications are guaranteed only within ham bands.