[TenTec] O2 output level with PSK aux in

jack jfriend31 at comcast.net
Wed Feb 11 17:20:14 EST 2009

jack ak7o

----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at storm.weather.net>
To: <tentec at contesting.com>
Sent: Tuesday, February 10, 2009 9:57 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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