[R-390] FA: GR Audio Meter

[roy.morgan at nist.gov]

Quoting Bob Camp <ham at cq.nu>:

> Hi
> 
> Cute little thing. Certainly worth the money if it's even close to  
> working.

Would-be audio power output measurers,

The GR 1840A output power meter is the fourth and last of such things GR made.
It is in fact superb.  Once you have one, you wonder how you got along without
it till then.

It measures from 0.1 milliwatts up to 20 watts directly and can be set for any
practical impedance load (0.6 ohms to 32 kilohms).  It is for all practical
purposes flat and plenty accurate for any uses we would have.

Cute trick: get a separate load resistor, put the output power meter in parallel
with that and set the meter for 10 times the load resistor. The thing will then
indicate one tenth the power in the load.  This gets you to 200 watts easily. 
Or, you can make a "T" network as the manual explains.

Note, the one for auction has a bid of $15 just now, but normally they go on
ebay for up to $100 or a bit more, though lately one or two have sold for more
modest prices.  (300193100784 )

There is a manual scan available at http://www.jptronics.org/radios/ for anyone
who might buy it or already have one.

Roy

Roy Morgan
13033 Downey Mill Road
Lovettsville VA 20180