I've been spending a couple hours a day listening / watching PSK-31 DX for a
QSN report for QRZ DX. Occasionally I work something using my Corsair II,
running between 20 and 30 Watts. I find there's quite a few DX stations
running 3 to 5 Watts that have good signals. And then there's the strong
stations with multiple sidebands that make copy impossible. Does anyone need
to run 100 Watts on PSK? Not really.
Best regards,
CSM(r) Gary Huber - AB9M
9679 Heron Bay Rd
Bloomington, IL 61705
(309-662-0604)
www.csm-gh.com
glhuber@msn.com
gary.huber@us.army.mil
--------------------------------------------------
From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Sent: Tuesday, February 10, 2009 10:57 PM
To: <tentec@contesting.com>
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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