[Amps] Vacuum Relay

[Paul]

When transmitting a series of dots, QSK, if you have relay timing issues you 
will observe ramps on the top and bottom of the waveform instead of a flat 
top and bottom rectangle.

This is a result of the ALC in the exciter seeing no load during the 
switching period and instantly cutting back the power output, and when it 
sees the load the output of the exciter will ramp up.  Depending on the 
speed and duration of your cw you may or may not ramp up to full output at 
the end of the cw element.

de Paul, W8AEF

-----Original Message----- 
From: Jim W7RY
Sent: Monday, December 10, 2012 6:39 PM
To: Bryan Swadener ; amps at contesting.com
Subject: Re: [Amps] Vacuum Relay

What would a waveform monitor scope have to do with a timing issue with a
vacuum relay?  You cant use one to check the other.

It takes a dual trace scope to check relay timing.

73

Jim W7RY


-----Original Message----- 
From: Bryan Swadener
Sent: Sunday, December 09, 2012 2:02 PM
To: amps at contesting.com
Subject: Re: [Amps] Vacuum Relay

> From: Paul W8AEF
> Subject: Re: Vacuum Relay
>
>
> ... for some reason not many hams use a scope as a waveform
> monitor.
>
> de Paul, W8AEF

That's unfortunate.  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.  The vertical amplifier needs
to respond at least twice as high as the highest radio
frequency.  At HF, this is about 60 MHz, and a usable unit
can be found for about $1/MHz or so. Compared to the cost of
an amplifier, it's peanuts.  After I upgraded my lab scope,
I "retired" my Tek 2236 (100 MHz) to use as a TX monitor.

vy 73,
Bryan WA7PRC
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