In a message dated 97-02-11 23:38:55 EST, jm165723@eee.org (john andrews)
writes:
>Hi Gang:
>
>Pawing thru the junque box and pulling parts for my next shack
>Mega-Parts super sale and found a new 100-0-100uA meter.
>
>Anyone used this as a null indicator in a dip-meter? Seems the reason
>most dip-meters don't use it is due to the cost(?)... Anyone ever try
>it?
>
>Thanks, John-N5INZ
John & Group
I've used zero-center microammeters to add a larger display to a left-right
type VHF direction finder called the "L-Per". The L-per was pretty hot on
sensitivity and locating foxes concealed in packages or vehicles, but lacked
a large meter for mobiling. Hating to look away from the road, My lighted 3"
meter was mounted near the rear view mirror.
I've used a 2-diode voltage doubler, 50 K pot and standard 50 uA meter to
make a cheapie field strength meter which at "full scale" could detect 25 to
100 mW VHF signals at 1 foot. This was not a zero-center meter.
Some FM'ers have added zero-center meters to the discriminators in their
receivers to tell how far another signal was off frequency. Also useful for
getting "signatures" of lid and jammer signals for future comparison.
73, Jay
W6CJ
[
QRP-L Archive |
]
[
1993 |
1994 |
1995 |
1996 |
1997 |
1998 |
1999 |
2000
]