Pictures of my Mark II engine compartment heater. The heater controller schematic is from my Mark I unit. The Mark II controller is similar, but without the 120 volt auto transformer. A gell cell battery, smart charger, and 7 watt pulsating siren (tripped by a on-boat motion sensor) are included in the controller. It drives an external horn speaker.

This PDF file describes my modification of an Elecraft K2 for PSK31, RTTY, Etc. 452K File

This ZIPed file is a simple calculator for HF bandpass filter design. Requires vbrun300.dll --- 24K Download without dll

E-Z Design of a 3-Terminal voltage regulator. 40K PDF File

Here is a very simple, yet very sophisticated field strength meter. Range is about -80 dBm to +12 dBm - to 500 MHz. Includes pictures and circuit. PDF File - 294K Download

75 Meter SSB Tranceiver, 10 Watts Output. 38K File

Download documentation (all there is) for the 75 M Rig.
...Images of some of the circuits in a zip file. ...Documentation very incomplete!
Beware! This is a 1.5 Meg download.

Shack Power Supply. Linear, 13.6 Volts, 80 Amps. Cont. 31K File

Download schematics for the above power supply. Zipped package of bitmapped .tif files. 67K File

Solid State Linear, 160M to 10 M, 10 Wt. input, 250 Wt. Output. 69K File
Mods: February 2003
Replaced PA transistors (4) with Matched Quad from RF Parts Co. - #SRF3800, added attenuator to PA board input - Inline w/coax., Added heat sink cooling fan. -Energized when amp in "OPerate" mode., Adjusted Power out cal pot and ALC cal pot...
Now: >300 watts out with less drive!

Download schematics for the above amplifier.
...Includes nice LP Filters, bias, etc. Based on Ham Radio Mag. articles of yesteryear.
Zipped package of .jpg files. WARNING! This is a 2.6 Meg File.

20 Meter SSB Transceiver, 10 Watts Ouput. 48K File

Download documentation (all there is) for the 20M Rig.
...Images of some of the circuits in a zip file.
...Documentation somewhat incomplete. Uses out of production Plessy ICs in SSB generator.
WARNING! This is a 5 Meg download!!!

Direct Reading SWR / Power Meter.

Download the 1973 article. Zipped image files. WARNING! This is a 1.8 Meg File.

HF Linear Amplifier, using a pair of cathode driven 4-400 Tubes. 53K File
Click Here for a truly junky schematic for the 4-400s. File: 282K
CAUTION, An error was brought to my attention. The B+ should pass through the choke and be connected to the lower side of the doorknob blocking capacitors. NOT STRAIGHT THROUGH !!
Thanks, Terry!

Six meter linear transverter. 1 Wt. at 20 meters -to- 15 Wt. at 6 m. 80K File

A sample schematic from the ZIPed package below. 17K File

Download zipped schematics for the Six Meter Transverter. (PCX Files, 68K)

ATV repeater - NTSC, 70 cm input, 33 cm output, AM. Picture Only 40K File

ATV Transmitter (MK-III) 15 Watts peak output (NTSC) on 70 cm. 62K File

Download schematics for the MK-III ATV transmitter above. Hetrodynes (mixes) to 70cm from Ch3/4 "modulator". 104K File

Another implementation of the MK-III design. Includes video switch for cross band RPT. Picture Only

NTSC ATV - Includes: 10 Wt. 70 cm Tx and 70 cm & 33 cm Rx downconverters. Picture Only

Picture of a Video Operated Switch. To downoad circuit, click next link... 32K File

Video Operated Switch - Turn on your ATV monitor / sound alarm when signal present. 120K File

Alliance U-100 rotator SERVICE MANUAL (4 jpg images - zipped)
Click thumbnail to download. 350k File

The Ham Shack Site of "KZ4AK (WB4QXE) Homebrew Lab" 30K File

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