i have an Autek research WM-1 meter. I'm trying to do the quick alignment as described in the manual I included an image
Am I reading it right using a 50-ohm dummy load, set the SWR to 1.1 ??? Also, I've noticed that when on the 2000 scale, the SWR doesn't register only on 20 and 200, and when making the adjustment, i assume the meter is set to avg, not pep also number 3 which trimmer
calibration procedure
1. With DC power applied to the WM1 (LED lit), but your transmitter off, mechanically zero both meters with the front-panel meter screws using a screwdriver.
2. Connect the remote head to your transmitter and to a load known to be 50 ohms resistive at the frequency transmitted (a 40 ohm load, for example, which is off by 20%, would cause power calibration to be off by 20% at 50 ohms, and SWR would not read correctly). You should preferably transmit on 40 meters (7 mHz).
While transmitting a carrier, adjust the trimmer capacitor in the remote RF head (C1 in older version of head, C6 in newer version) until the SWR reads 1:1 or as close as possible. Use 20-200 watts if possible.
3. Reverse coax connections to the RF head, so that your transmitter is connected to the output and the load is connected to the input. Disconnect one wire going to the SWR meter to avoid pegging this meter.
You’re now reading reflected power, which is much more sensitive than SWR. Touch up the trimmer to yield lowest power reading.
4. Reverse coax connections to the RF head again so that the transmitter is connected normally to the input. Reconnect the wire to the SWR meter. Disconnect the load from the RF head output, leaving NOTHING connected to the RF head output coax connector, not even a short length of coax.
Transmit less than 200 Watts CW (no linear) and adjust the SWR trim pot on the circuit board (see drawing) so that the SWR meter reads infinity (full scale). Do this on 40 meters if possible, for best accuracy.
5. Connect your accurate 50 ohm load as in step 2. With a power meter of known accuracy in series with the WM1, adjust the PWR trim pot on the circuit board (see drawing) until the WM1 reading agrees with the reference power meter. Be sure SWR is 1:1.
Am I reading it right using a 50-ohm dummy load, set the SWR to 1.1 ??? Also, I've noticed that when on the 2000 scale, the SWR doesn't register only on 20 and 200, and when making the adjustment, i assume the meter is set to avg, not pep also number 3 which trimmer
calibration procedure
1. With DC power applied to the WM1 (LED lit), but your transmitter off, mechanically zero both meters with the front-panel meter screws using a screwdriver.
2. Connect the remote head to your transmitter and to a load known to be 50 ohms resistive at the frequency transmitted (a 40 ohm load, for example, which is off by 20%, would cause power calibration to be off by 20% at 50 ohms, and SWR would not read correctly). You should preferably transmit on 40 meters (7 mHz).
While transmitting a carrier, adjust the trimmer capacitor in the remote RF head (C1 in older version of head, C6 in newer version) until the SWR reads 1:1 or as close as possible. Use 20-200 watts if possible.
3. Reverse coax connections to the RF head, so that your transmitter is connected to the output and the load is connected to the input. Disconnect one wire going to the SWR meter to avoid pegging this meter.
You’re now reading reflected power, which is much more sensitive than SWR. Touch up the trimmer to yield lowest power reading.
4. Reverse coax connections to the RF head again so that the transmitter is connected normally to the input. Reconnect the wire to the SWR meter. Disconnect the load from the RF head output, leaving NOTHING connected to the RF head output coax connector, not even a short length of coax.
Transmit less than 200 Watts CW (no linear) and adjust the SWR trim pot on the circuit board (see drawing) so that the SWR meter reads infinity (full scale). Do this on 40 meters if possible, for best accuracy.
5. Connect your accurate 50 ohm load as in step 2. With a power meter of known accuracy in series with the WM1, adjust the PWR trim pot on the circuit board (see drawing) until the WM1 reading agrees with the reference power meter. Be sure SWR is 1:1.