Elecraft XV Transverter Owner's Manual User Manual

Page 33

- 29 -

If aligning an XV222 or XV432, turn the power off, then on again

(either using the front panel switch or, if using an Elecraft K2 or K3 for
the I.F., use the K2 or K3 BAND switch to deselect and select the
transverter). Make sure the local oscillator voltage returns when power is
turned off then on again. If not, adjust L19 (XV222) or L4 (XV432) for
reliable starting each time power is turned on.

Part IV – Receiver RF Amplifier Bias Adjustment

Adjust the receiver low-noise amplifier (LNA) bias current as follows:

Connect your DMM to measure DC voltage between TP2 in the

upper left quadrant and ground.

Adjust R13 as follows:

XV50, XV144 or XV222: between 175 and 275 millivolts.

XV432: 5 volts.

Part V – RF Power Amplifier Quiescent Current
Adjustment.

Attach a 50 ohm dummy load to the transverter ANT connector.

Connect your DMM between TP3 (-) and TP4 (+) near J7 in the

upper right corner of the RF PCB.

If you are using an Elecraft K2 or K3 for the 28 MHz I.F., note the

settings on the Band Select DIP switches. You’ll need them later.

Set all four Band Select DIP switches to Off (toggles toward the front

panel). If you are using a non-Elecraft rig for the I.F., they will already be
in the Off position.

Disconnect the 28 MHz rig KEY IN line to the transverter, if used.

Insert the shorted RCA plug into the KEY IN jack on the back of the

transverter. This will put the transverter in transmit mode. The 28 MHz rig
must not be keyed to provide RF drive to the transverter for this
adjustment.

Adjust R39 for a reading of 20 mV on your DMM. If R39 has no

effect when aligning an XV40, XV144 or XV222, ensure W1 is installed
on RF board between C60 and R28.

Reconnect the 28 MHz rig KEY IN line to the transverter, if used.

Reset the Band Select DIP switches to their former positions.

Part VI – Filter Alignment.

Align the tunable filters in the I.F. and R.F. path as follows:

Adjust your 28 MHz rig output for the level chosen to drive your

transverter to full output (normally 1 milliwatt, 251 milliwatts or 5 watts)

Attach your DMM ground probe to one of the ground test points on

the RF PCB.

If you drive the transverter with 5 watts from your 28 MHz

rig, you may notice that some of the 1-watt resistors are quite warm to
the touch. This is normal. They are operating well within their design
ratings. These resistors were mounted above the PCB to promote
good cooling air circulation around them.

Connect your DMM to measure DC voltage between a ground test

point and TP5 in the upper left quadrant near potentiometer R10.

Set the 28 MHz rig frequency to transmit at 50.5 MHz, 144.5 MHz,

222.5 MHz or 432.5 MHz. If you are using an Elecraft K2 or K3 in
transverter mode, the frequency display will show the actual transmit
frequency. Other rigs must be set to 28.5 MHz.

Key the 28 MHz rig to provide transmit RF to the transverter and

advance R22 (Input Atten. Adjust) until the DMM reads anywhere
between 0.1 and 10 volts. Key the 28 MHz rig only as long as needed for
each adjustment.

While performing the alignment, take care not to overheat

your 28 MHz I.F. rig by holding the key down too long.