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You can put heat-shrink tubing over 3mm D rod in the areas where larger diameter is needed. Ed

On the SC504, the gain and sweep knobs just pull out after the red variable knobs are removed from their shafts. The SC503 is similar but the knobs are not interchangeable.The variable knob shafts do

David I recently found a source for a similar item here in states at what we call a "Hobby Shop" (Model planes, trains, ships, etc) Dave manuals@... -- Dave Manuals@...

I'm looking for a UK source of 1/8" (0.125" or 3.2mm) diameter fibreglass rods (or other hard plastic) such as is used in many 7000 series plugins. For the specific application (the rod down the

I will delete mine since it is a "borrowed " copy and not properly acquired. Renée

The oscillator's period (better: interval between pulses) must be long enough to avoid overlapping between edges and echos and short enough for a bright, non-flickering image, if you're using a

Okay, I will make one more attempt at this explanation. This morning I went back to the same SC504 that I played with yesterday. I removed the small knob and 1/8" shaft assembly that goes through that

Sent. mike.terrell@...> wrote:

You're welcome. Michael A. Terrell

Have you asked the site owner to remove it? He may not know where it came from, since the site was intended for old ham radio manuals. Michael A. Terrell

I want to say at the scan on Bama is from Artek. I used to provide them with very rare tektronix manuals to be scanned. They spend many many hours cleaning up Originals making sure things are aligned

that works.....Thank you...now I can follow along Renée

interesting design for a cheap tdr. thanks! wrote:

Both parts are 5% but that isn't important. The time required for a pulse to travel to the discontinuity isn't affected by the error in the pulse width. If it bothers you, use a crystal time base

Guys, Thanks very much for all of your help and the link to Hakan’s info - I’ll certainly have a look! I managed to do a deal with a US seller for a complete, working board(s), but will repair

Guessing isn't good enough, you need to analyse the circuit and take into account the hysteresis of the 74AC14 Schmitt trigger. Bruce

Because I don't know what else is establishing the frequency (hence "...or is something else at work here?"). Thanks, Barry - N4BUQ

Why do you think that the frequency is equal to 1/RC? Bruce

Looking at that schematic, it appears the frequency is determined by C3 and R1. If I'm not mistaken, the exact values of those components would result in a frequency of 3.129 kHz; however, the

Ah kay. Thanks for explaining. So, looking at the pinout in the 5A22 schematics, sure enough, it's totally different from the TM5000's receptacle wiring. I guess it would be kind of tedious, but it