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Re: [Amps] Vacuum Relay

To: "Paul Christensen" <w9ac@arrl.net>, <amps@contesting.com>
Subject: Re: [Amps] Vacuum Relay
From: "Carl" <km1h@jeremy.mv.com>
Date: Fri, 14 Dec 2012 15:19:45 -0500
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Agree.

With a 100 MHz Tek 465 analog scope now under $100 with at least one probe its a shame not to have one on hand for all sorts of uses. You also get more triggering and display combinations than the more basic variety.

Carl
KM1H


----- Original Message ----- From: "Paul Christensen" <w9ac@arrl.net>
To: <amps@contesting.com>
Sent: Thursday, December 13, 2012 2:15 PM
Subject: Re: [Amps] Vacuum Relay


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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