I am Mike, K7MDL.  On this site you will find several of my projects mostly related to ham radio.  Interests related to ham radio cover software and hardware design for the VHF, UHF and microwave bands.

RF Wattmeter Project
DIY Arduino and PSoC5 based VHF-Microwave Wattmeter with local and remote control.
Multiband LO Project
PSoC5 based programmable local oscillator for transverters and weak signal source test signals. Featured in January 2020 QEZ magazine.
Is fully configurable with a rotary encoder and 2×16 LCD character display. Uses a radio’s (or N1MM+) BCD band decoder input and translates it to a configurable band decoder output with 6 lines and PTT pass through.
LO level is measured by a 8GHz RF detector. Uses a RF SP6T switch, programmable 31dB attenuator, and a 22dB wide band amp to set the perfect LO drive level for each band. Band decoder outputs can be used to select transverters and select antennas.
N1MM+ OTRSP protocol based Antenna/Transverter Band Decoder Project
N1MM+ and some other logging programs feature OTRSP serial protocol to control a band decoder for antenna or transverter selection.  This is a subset of a larger set of commands for SO2R control boxes.   
The RF wattmeter was a test bed for this subset.  The next step is to load this onto a Nano to control 2 sets of outputs with BCD or parallel IO up to 16 values or IO lines for 1 or 2 radios.  Uses a single USB connection and some IO buffers.  A LCD scxreen is optional.
Ham Radio Station Profiles
I split my time between homes in Bradenton FL and Camano Island, WA.  Each station is K3 based with transverters and RF amps for complete band coverage on 160M through 1296Mhz.  Both stations are remote operable and I often check into VHF nets each week at both locations. 
I have 5.7GHz and 10GHz at the Camano Island QTH. 
Both homes are in antenna restricted neighborhoods so my antennas are hidden under decks, in attics, and I have 6 bands – 50 thru 1296 – in a single tree hidden from view in Florida.  I am now about to install a rotator hanging from the back deck in Camano with short yagis on some bands.

WA7TZY became a SK in 2020 and we miss him.  He was a talented RF engineer and mentor. With with his XYL Susan, WB7BST, they have enriched the VHF weak signal community for many years of weekly and contest operation.

They also were big HF operators in past years. They have spent years building a very competative station on 11 acres near Woodinville WA.  Susan has been the weekly 1296 net control for a very long time now, maybe 20 years?

5.7GHz Transverter Project
In 2005 WA7TZY and I converted several 5.7Ghz wireless ethernet units to ham radio transverter duty.  A 3Mhz double oven OCXO disciplines a 41Mhz heated crystal in a PLL to provide a stable low phase noise reference for a 1.5GHz National PLL which is muliplied to 5.3G.  The IF is 430Mhz at -8dBm drive typical.
It has dual receivers and 90mW out with tunable output filters.  Uses PIC 16F877A chip for interface and sequencing. An extra feature I added uses the FT-817 TX Inhibit when the band is not on 430Mhz to prevent an accidental IF overdrive scenario from operation on another band that could be at 5W.
10GHz Transverter Project

My 10Ghz system is based on a MACOM “White Box” conversion to make a 144 to 10GHz transverter.  90mW to a 1ft dish.l A aviation amp module is the LNA.  I am using a DigiLO programamble PLL at 2.556GHz driving a converted Qualcom x4 multiplier for the LO.  An FT 817 is used as the IF.


Amplifier Projects

I have several ampifier projects in 2020.  Both stations got upgrades on 144 through 1296, generally 200W to 500W.