From: "Bob Bruhns" <[EMAIL PROTECTED]>
> Bacon, not trying to be contrite, but where in the
>old rules did the .25
> second time constant appear? I have a copy of the
>old rules and don't see
> it. It says only that "have the means".
Hi Jim... Hmm, it came from my sometimes flakey
memory... I'm pretty sure there was a 0.25 second spec
for the metering somewhere... maybe it was simply
assumed that the meter time constant would be about
0.25 seconds.
From ARRL's "Single Sideband for the Radio Amateur," p. 14, 1958 edition:
S.S.B. POWER LIMIT
...We quote from a Commission letter addressed to ARRL:
The following . . . may be considered as a presently acceptable method
for determining the d.c. plate power input to the final r.f. stage of a
single-sideband amateur transmitter:
The maximum d.c. plate power input to the radio frequency tube or tubes
supplying power to the antenna system of a single-sideband
suppressed-carrier transmitter, as indicated by the usual plate voltmeter
and plate milliammeter, shall be considered as the "input power" insofar as
Sections 12.131 and 12.136(d) of the Commission's rules are concerned,
provided the plate meters utilized have a time constant not in excess of
approximately 0.25 second, and the linearity of the transmitter has been
adjusted to prevent the generation of excessive sidebands. The "input
power" shall not exceed one kilowatt on peaks as indicated by the plate
meter readings.
Don k4kyv
