ELECRAFT K2 SSB Manual
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ELECRAFT K2 SSB Manual

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DL-QRP-AG
K2 SSB Modifikation
A compilation of the mods suggested by
John, KI6WX, Karl-Heinz, DF7KHK and Frank, DJ3FR by DL2FI
© QRPproject Molchstr. 15 12524 Berlin http://www.QRPproject.de Telefon: +49(30) 85 96 13 23 e-mail: support@QRPproject.de
Manual by: FIservice Peter Zenker DL2FI email:dl2fi@qrpproject.de
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  • Page 1 DL-QRP-AG K2 SSB Modifikation A compilation of the mods suggested by John, KI6WX, Karl-Heinz, DF7KHK and Frank, DJ3FR by DL2FI © QRPproject Molchstr. 15 12524 Berlin http://www.QRPproject.de Telefon: +49(30) 85 96 13 23 e-mail: support@QRPproject.de Manual by: FIservice Peter Zenker DL2FI email:dl2fi@qrpproject.de...
  • Page 2 Xtal Filter suggested by John have been bands. Using microphones with higher levels it can happen, that the NE602 overtaken for the series kits by elecraft some years ago. is over driven with causes AF clipping. This mod is a clean solution for both problems.
  • Page 3 number 2 wire to solderlug number 4. This will reverse T2 by 180 degrees. [ ] Install a PN2222 (attention, 2N2222 has another pinning). Place it at the right side of NE602 the flat side orientated towards NE602. The 3 Pins look upwars.
  • Page 4 MOD 2: Decreasing distortions If the Level for the NE602 Input gets to high, this will cause AF clipping what means Intermodulations and Distortions of the AF signal. To avoid this, we add a Resistor. [ ] Check R2. If it is not 5k6 replace it with 5k6. [ ] Solder 2k2 resistor between PIN 1 and PIN 2 of U5.
  • Page 5 Modifikation: Microphone Sensitivity (DF7KHK Meßpunkt SSB unmodified SSB modified U3.4 30 mVpp 60 mVpp The K2 feeds the the compressor chip U3.7 1,5 Vpp 1,2 Vpp directly, not using any preamplifuer. U5.1 600 mVpp 300 mVpp Regarding the KSB2 Manual the U5.4 800 mVpp 1 Vpp...
  • Page 6 for the other SSB Bandwith´s which will be adjusted to best sound in receive mode only. Addition: We found at a very low number of K2 (mostly K2/100) a small anomaly in the ALC funktion. Check the following and modify if necessary Switch Display to ALC Push PTT and talk your normal way.

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