KO7M - Ham Radio Blog

So, I have a transformer that has two primary windings that can be typically be hooked up in parallel for 115 VAC operation or in series for...

More years ago than I care to remember I picked up a Kenwood D700 rig.  Since I have recently pulled the HF rig and D-Star rig out of the ca...

I managed to find a nice little period (sort-of) speaker for the SW-3 receiver on eBay.  It is a nice little "tombstone" style cab...

So, today I finally sat down to see if the SW-3 is actually functional.  The first order of business is to come up with 2.5 volts at 4 amps ...

I have found a little gem of a transformer for my radio projects: The Bogen T725 audio transformer.  I basically gives you the ability to ma...

I picked up my old TNC2 packet controller and dusted it off today.  After finding an old Hayes modem cable I was able to wire this dude up t...

This morning I had some fun with my Arrow antenna and an old Yaesu 2 metre hand-held transceiver.  I generally track a hand-ful of Ham Radio...

Reading the brainwagon.org blog, I came across today an 8080 emulator that is implemented (of all things) in JavaScript.  I can load it up i...

After discussing with my buddy Eldon, I have decided not to use the voltage divider approach to power the filaments.  They are all wired in ...

A while back, I posted a note about having found an old 1930's National SW-3 receiver.  The rig came without a power supply.   I need to...