[AMPS] Power out indicator

Joe Giacobello, K2XX k2xx@swva.net
Tue, 12 Feb 2002 19:56:31 -0500


Barrie, an easy way out is to use an RF ammeter in one of the legs of open
wire line and simply tune for maximum RF current.  If you're running a KW,
you'll probably need a 0-10 A meter.

73, Joe


barrie99@marsweb.com wrote:

> Hello:
>
> I'm building a 160M only link-coupled antenna tuner.  Will have a Bird
> wattmeter on the input side, but would like to have a "relative power
> output" indicator on the output side (600 ohm balanced line).
>
> I've seen schematics for such devices in handbooks, but they are used on
> the output of amplifiers running into 50 ohm loads, and include
> provisions to measure reflected power, as well.
>
> I'm thinking that the voltage on the 600 ohm line could be much higher
> than it would be on 50 ohm line.
>
> All I (think) I need is a voltage dropping resistor, a diode, a pot to
> fine-tune the voltage and a DC meter.  I just don't know the values of
> each.
>
> Anyone know where such a circuit may be found?
>
> TNX, Barrie, W7ALW
>
> --
> FAQ on WWW:               http://www.contesting.com/FAQ/amps
> Submissions:              amps@contesting.com
> Administrative requests:  amps-REQUEST@contesting.com
> Problems:                 owner-amps@contesting.com


--
FAQ on WWW:               http://www.contesting.com/FAQ/amps
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com