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Old March 18th 10, 10:36 PM posted to rec.radio.amateur.equipment
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First recorded activity by RadioBanter: Mar 2010
Posts: 21
Default Opinions about Yaesu FT-817ND transceiver?



Wow, thanks everyone for the great reports on
the lttle Yaesu transceiver!

I am contemplating it mainly for its ears.

I wanted to order the optional Collins 300 cycle filter
for CW work, but had hazy memories from 55 years ago
that such filters tended to cause unwanted "ringing"
of the output audio, kinda like a steady loud output "hiss".

When I left Ham Radio in 1955, the QRPp experts were
playing with "active filters" for low power QRP work.

If I remember correctly, such filters would block _all_ the
signal, noise and everything, then open up a 30 cycle "window"
for a brief while when the "start" of a dot or dash
was liable to occur.

The entire mess, transmitter and distant receiver was sync'd with
the WWV time signal, to open and close the receiver's active filters
during automatic CW transmission.


The incoming dot or dash audio would be re-generated artificially
by a separate audio circuit in the receiver.

QRP advocates claimed they could get on a crowded voice band,
and pump a low power CW signal through at a slow speed
of a few words-per-minute.



Switching Gears -
*********

Does anyone know if the FCC still requires at least 50 RF watts
to legally drive a linear amplifier?

There was talk that they might change that requirement so that
low power rigs like the Yaesu could drive an amplifier.

Of course, nothing to stop a ham from building his own
intermediate amplifier, but cleaning up all the harmonics is
a major concern.

Mark
 
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