coaxial cable info

http://ve2azx.net/technical/CoaxialCableDelay.pdf

 

Changing the phase delay between the sampler and the oscilloscope Alters what you see on the scope. That being said,
It stands to reason that someone not taking this into consideration would unknowingly with good intentions be Misaligning every radio that comes off his bench.
This perfectly explains my dissatisfaction with the majority of radio technicians who actually went to school to learn their occupation.

 

Reactance varies with frequency Due to capacitance and inductance.
Capacitance and inductance cause phase shift which Alters what you see on an oscilloscope.
That being said It stands to reason if this is not taken into consideration which nobody ever does, that every piece of equipment coming off of that bench would be slightly misaligned and based upon my experience of listening to people Fade Out of my receive fairly quickly, and that includes customers of the best technicians in the business even though they sound great up close they all seem to disappear out of my receive within a very short period of time

 

I have a video that I made back in 2012 Demonstrating what everyone should look for in performance I'll have to find that video and upload it to YouTube.
It should be quite entertaining

 

The best analogy I can think of is back in 1979 a customer goes into a Chevy dealer and buys a Chevy Corvette. He takes his Corvette to his personal mechanic and tells the mechanic to check the ignition timing. The mechanic connect his timing light to the number one spark plug wire and fires up the engine. The timing mark shows up as 4 degrees before top dead center which the specifications called for. He doesn't trust his mechanics judgement so he takes his car to another mechanic who proceeds to hook his timing light up to the number 2 spark plug wire.
Mechanic number to fires up the engine and pulled the trigger on his timing light and is unable to see the timing mark. He loosens up the nut and rotates the distributor until the timing mark is set precisely at 4 degrees before top dead center which is within specifications. Now the car is running like crap. Even though both technicians set the timing mark at 4 degrees before top dead center technician number 2 connected his timing light to the number 2 spark plug wire instead of the number one spark plug wire.
Both technicians got the same reading using the same equipment connected at a different point in the 360 degree rotation of the distributor. So which technician did the job correctly?

 

I wonder how many people make simple observations and take notes for example every time you hear someone talking from 30 miles away asking that person who their technician is and making a mental note of the answer?
Or every time you hear somebody that sounds good up close but disappears very quickly asking that person who their technician is and making a mental note of the answer? Over a period of ten years of doing this you would start to notice a pattern if you ask people the right questions driving from coast to coast.
Only one technician consistently delivers results of 30 plus miles to all of his customers.
The receiver sensitivity that he is able to consistently achieve has a lot to do with it I'm sure.
It's definitely a mystery that needs to be solved.
David Bupp at DTB RADIO went to DeVry University and does excellent repair work. But unfortunately all of his customers are mud ducks. I'd love to understand why they sound good up close and disappear from my receive quickly.
Russell Clift aka AB7IF was a genius.
He was probably the best repairman in the business and could troubleshoot things that no other person could troubleshoot. unfortunately none of his customers could reach me from over 15 miles away. I wonder why? I wish I could solve the mystery. All but one of the best technicians in the business are unable to produce customers
That can talk to me from distances greater than 15 miles.
I wonder why? I wish I could solve the mystery.
Bob at Bob's CB shop is unable to produce a single customer that can talk to me from a distance greater than 8 Miles. I wonder why? Could it possibly be that he does not know how to use an oscilloscope?
The list goes on and on and only gets more dismal from there.
If you ask the right questions often enough you will start to notice a pattern and you might learn something.
One of the rare occasions I was impressed with the performance of someone's radio I was backed into a loading dock in Temecula California facing due north in my Volvo 770, and I had a
two-way conversation with
"Traveling Salesman" the owner of CB radio store in Fontana who happened to be in his car on his way to work in Fontana California. Ron Damron was the technician that tuned his radio.
Ron got a two-year Electronics degree at a junior college in Southern California and is one of the few technicians capable of producing receiver sensitivity comparable to mine.
We spoke back and forth at a distance of 56 miles for about 20 minutes or so.
Unfortunately none of the customers from that shop transmitting from a tractor trailer have ever been able to reach me from a distance greater than 15 miles.
I wonder why? I'd like to solve the mystery.
I'm sure the technicians lack of understanding about how to properly set up a mobile antenna has a lot to do with their customers lack of performance which basically renders that technician useless to his customers unless that customer happens to be one of the lucky few that happens to drive a car with a radio in it instead of a tractor trailer.
So yes the performance someone achieves will vary greatly depending on the "technician"
And a technician that allows his customers to make poor antenna choices or who makes bad recommendations to his customers regarding antenna systems is useless to his customers.