[TenTec] O2 output level with PSK aux in

Gary Hoffman ghoffman at spacetech.com
Wed Feb 11 16:46:15 EST 2009

Please don't run high power on PSK.  You will just raise absolute havoc.

73 de Gary, AA2IZ

----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at storm.weather.net>
To: <tentec at contesting.com>
Sent: Tuesday, February 10, 2009 11:57 PM
Subject: Re: [TenTec] O2 output level with PSK aux in

> On Wed, 2009-02-11 at 02:54 +0000, Jim M. wrote:
> > Using HRD sound card into rear panel auxiliary input.  With speech proc
off I get only about 50 watts out with max audio drive measured on rf
wattmeter.  The O2 meter shows 100 watts, not 50.  If I turn SP on, I can
get closer to 100 watts out.  The O2 power meter appears to be reading 2x
what is actually being transmitted?  And or the drive level without the SP
is cut 50 percent?  What's going on in the DSP?  Any suggestions on how to
get an honest 100 watts on Psk? Jim N4BE
> >
> > Jim
> You get 100 watts PSK by running 20 watts from the Orion into a 600 watt
> amplifier. Otherwise the intermod just kills the BAND you are on, and
> the other users will be wanting to shove nails into your coax. You don't
> NEED 100 watts to work the world and no radio puts out clean PSK31 at
> full rated power. Most do fine at 30 watts or less, and that's enough to
> work the world.
> Since PSK allows many RF signals in a typical receiver IF bandwidth, its
> super annoying to have one super strong signal (which 100 clean watts
> would be) to take over the AGC and blank the other signals. So high
> power (and 100 watts on PSK31 IS HIGH POWER) is unwelcome and not
> needed.
> Receiving software nearly always shows an intermod level as well as
> showing extra spectrum components on the waterfall display. It is
> instantly clear who is running the transmitter too hard. Settle for 25
> watts and you will make more contacts and friends.
> 73, Jerry, K0CQ
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