[Boatanchors] Radio Transmitter testing
Jack Antonio
[email protected]
Fri, 27 Feb 2004 17:57:02 -0800
Light bulbs can be used as dummy loads,
but the impedance will vary as the bulb warms
up.
On transmitters with buffering between the oscillator
and PA, this should not cause a problem, but on
transmitter such as the "ARC-5" command set, that
are a VFO feeding a PA, the impedance change of the
bulb will cause the oscillator to shift frequency and
a chirpy signal.
This was a source of many reports of WWII surplus
transmitters being unstable.
Jack Antonio WA7DIA
[email protected]
----- Original Message -----
From: "William L Howard" <[email protected]>
To: "[email protected]" <[email protected]>
Sent: Friday, February 27, 2004 3:35 PM
Subject: [Boatanchors] Radio Transmitter testing
> Is there any sort of method to determine if a transmitter is actually
> transmitting with out connecting to an antenna? Something like a light
> bulb on a wire or???
>
> Bill Howard