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Re: [Amps] Vacuum Relay

To: amps@contesting.com
Subject: Re: [Amps] Vacuum Relay
From: Pete Smith N4ZR <n4zr@contesting.com>
Date: Sat, 15 Dec 2012 07:03:55 -0500
List-post: <amps@contesting.com">mailto:amps@contesting.com>
I could sure use asimple-minded explanation of how to connect my dual-trace scope in order to get a display of system timing. The description below, while I'm sure it is correct, doesn't get this history major far enough.

73, Pete N4ZR
Check out the Reverse Beacon Network at
http://reversebeacon.net,
blog at reversebeacon.blogspot.com.
For spots, please go to your favorite
ARC V6 or VE7CC DX cluster node.

On 12/13/2012 2:15 PM, Paul Christensen wrote:
A scope isn't going to tell all but it
tells a lot about a signal.  They're not difficult to use
and don't have to cost a lot.

It doesn't take long to find some incredibly good buys on used Tektronix scopes -- and at a price about half of the popular high-end wattmeters. Folks have no problem paying $600 for a wattmeter with unnecessary high accuracy, but seem to find no need for a scope. Is it the number of controls that's so intimidating?

The dual trace function isn't required to determine if hot-switching occurs, but is required to measure system timing. For station monitoring here, the scope's Channel A is set to trigger on the keyer's output while Channel B samples RF. This setup makes it easy to replicate the same CW waveform measurement as shown in the QST Product Reviews. By triggering the scope from the keyer, the waveform stays in place for timing measurements without having to chase it with the scope's variable time-base control.

Paul, W9AC
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