Click on the R-390A for its schematics in Visio and PDF formats.
R-390A LINE AND CARRIER LEVEL METERS:
Click on the meter face to see some meters I have available as substitutes for the originals.
1:9 ANTENNA BALUN:
Click on the picture to see how I made this one I'm using to feed my open feedline.
600 OHM OPEN FEED LINE, ALSO CALLED LADDER LINE:
Click on the picture to see how I made my open feedline.
MANUAL REMOTE ANTENNA TUNER or REMOTE IMPEDANCE MATCHING NETWORK:
Click on the picture to see my remote tuner.
AC POWER MONITOR
Click on the picture to see my power monitor used with the standby power generator.
DSP* SPEAKER SYSTEM
*Digital Signal Processing
Click on the picture to see my latest speaker addition that includes high- and low-frequency adjustable rolloff frequencies, BHI audio noise reduction, and amplified audio.
RADIO SHACK MTA-20 (21-527) DIGITAL POWER / SWR METER
Click on the picture to see the mod I did on mine to improve its visibility.
COLLINS PTO TEST SET:
Click on the meter face to see the test set I built and use checking out the pto in Collins S-line and KWM-2 series equipments.
CAPACITOR ESR TEST METER WITH TONE to check electrolytic capacitors.
Click on the meter face to see the tester with a tone for a sightless determination of capacitor quality.
10 MHz FREQUENCY STANDARD:
Click on the label to see my frequency standard using the HP 10544A crystal oven.
R390A MECHANICAL FILTER INTERNALS:
Click on the filter to see pictures when the shell is peeled away on one of the mechanical filters.
MICROWAVE OVEN TRANSFORMERS:
Click on the transformer for "Investigations on Using a Salvaged Mircrowave Oven Transformer".
COLLINS TYPE 516F-2 POWER SUPPLY:
Click on the power supply for "My Equal to a 516F-2 Power
Supply Project". Used to power Collins 32S-3 transmitters and KWM-2 transceivers.
Click on the SX28 for details on my recapping and renovation job.
7.5-15 VDC 30 AMP REGULATED POWER SUPPLY:
Click on the power supply picture for a pictoral trek thru the design and construction of this power supply.
LAB POWER SUPPLY
Click on the power supply picture for my general purpose power supply having +/- 12/15 VDC and +5 VDC outputs.
EXPANDED SCALE VOLTMETER:
Click on the meter for a description of my design for an expanded scale voltmeter to increase the resolution in a selected region.
HEAT DISSIPATING TUBE SHIELDS:
Click on the heat dissipating tube shields for details like part numbers and the effectiveness of these add-ons.
TUBESTERS and FETRONS:
Click on the tubester picture for all the literature I've been able to collect on these solid state tube substitutes for Collins receivers and transmitters. Also included are schematics of ones I've gotten my hands on and been able to surgically examine.
VARIAC VARIABLE VOLTAGE AC POWER SUPPLY:
Click on the picture to see my variac power supply that has both 0-120 and 0-140 volt capability.
YAESU FT-950 TO HENRY 3K-A CONTROL LINE INTERFACE:
Click on the picture to see my interface unit between the
transceiver and the linear amplifier.
CV-591A SSB CONVERTER MODS:
Click on the CV-591A front panel for details on a couple mods I did to mine to really improve its operation.
HQ-100A DIGITAL READOUT:
Click on the digital display for details on the digital readout I added to my HQ-100A.
SUPERADIO AUXILIARY INPUT MOD:
Click on the radio for an aux input mod to let your radio play from your MP3 player or laptop.
REMAKING METER SCALES USING VISIO SOFTWARE:
Click on the meter scale for details on how I go about remaking all those meter scales using Visio software.
Click on the keyer picture for details of the keyer I use when I'm not using the straight key.
NOAH'S FLOOD ALARM MOD:
Click on the picture for a mod to this water sensor that
increases the battery life 200 times.