A Wonderful Troubleshooting Story -- Thailand, Mixers, a Simpson 260, Microwaves, and some Black Tape

My old friend was really fortunate to have had such a good Staff Sergeant instructor at Signal School, someone for whom the mixer trig was obviously not enough.  And our old friend obviously also benefitted greatly from having had a dad who set him up with a Simpson 260 and some handmade experimental glass diodes. Wow.  It all came together with some black tape in Thailand... 

Bill,

Enjoyed your latest blog. I remember your asking about mixers years 

ago.  I received much the same explanation from a Staff Sergeant 

instructor at Ft. Monmouth in 1967.  His example was a mixer with 

diodes, noting the need to have them forward biased by the LO supply.  

We worked out much the same waveforms as shown in your Blog and 

the concept became part of my 'intuitive' knowledge.

A few years later I was fighting 120hz hum on the baseband of an IWCS 

microwave system feeding USAF command at the Korat Air Base in

Thailand. The hum was pretty high level and causing inter-modulation 

problems on the 60 channels of signal sideband suppressed carrier 

being applied to the microwave system.

We ended up with a couple of DCA DoD employees being flown in to help, 

to their credit they were prior service and darn good at what they did.  

After three days of testing all parts of the microwave system with a 

very long distance and long duration phone call to the manufacture in 

Calif, they still had not found the trouble.

I had stayed working with the DCA guys all of the time, during the 

testing I noted the hum seem to lessen in strength with someone standing 

directly behind the radio bay.

I went around to the back and took a close look, Yep! the mixer diodes 

for the baseband order-wire were glass and exposed.

Put a length of black tape over them and the hum went away.  Not the 

power supply problem everyone was fixated on, it was diode photo 

sensitivity.  I guess we could have just turned off the florescent 

lights too.

When I was 10 years old my father showed me how to use a Simpson

260 to check diodes and early transistors*. We were on the floor of the 

living room with sunlight streaming in.  I saw the forward resistance change

a lot when the glass diode was in sun light vs shade. It was this memory 

that prompted me to try the black tape.

All the MW systems in SEA later received a MWO to change out the 

order-wire board and I found that the assembly was a non-standard part 

of the microwave system just for military use.  Civilian deployment of 

that microwave system had no need for the order-wire.

Thanks for the quick trip, for me anyway, down memory lane and the 

memory of being an electronics tech hero for all of two minutes. The DCA 

guys made me buy the first round at the club.

73  from an old friend....