SR Lite RX V6.2 40/30m 07_External Connections

Install Power Connection

• Connect DC power leads to the pair of plated through-holes just below D1 on the left edge of the board.
• The plated through-hole nearest to D1 is the positive connection to a DC power source and the lower of the two plated through-holes is the power supply negative connection or circuit ground.

Install Soundcard (I/Q) Connection

A stereo audio cable may be connected at this time to the board at the three plated through-holes along the lower left edge of the board near the lower left corner.

• Use a short piece of #22 bus wire to connect the middle plated through-hole (ground) to the shield (barrel) of the cable and wrap the end of the bus wire around the outside of the cable several turns for strain relief of the cable.
• The tip of the stereo cable plug connects to the plated through-hole that is marked with the letter T on the board
• The ring of the stereo cable plug connects to the plated through-hole marked with the letter R.

The 30m, 20m, and 17/15m kits use 1/3 sub-harmonic sampling. This results in the I and Q signals for those kits being reversed. Consequently, if you are wiring the connections for one of these higher band kits, reverse the preceding wiring instructions. The photo below shows the wiring for the lower band kits.

Install Antenna Connection

It is extremely important to use an antenna with as close a match as possible to 50 ohms impedance. The radio's sensitivity is predicated on a 50 ohm antenna input.

• Connect a length of 50 ohm coax to the antenna connection on the right edge of the board near the upper right corner.
• The upper of the two plated through-holes is the antenna return connection to the coax shield
• The lower plated through-hole is the coax center conductor connection.

You may want to review the series of messages on this subject in the Softrock 40 Yahoo Group.

Additionally, you should review the materials on the Clifton Labs website concerning the use of an antenna isolation transformer

Finally, regarding the "floating antenna RET" connection, review the messages in this topic where the builder was getting no signal and the cause was the improper ANT RET connection.