[SMCARA] PSK-31 Signal

[Rene Ramirez]

morning everyone,

I can agree with Tom 99%  You will find the AKR club guys trying to push
1.5kw on psk31 (on a beam no less) will without a doubt make a big red mess
out of the waterfall for the the entire area (They probably think they are
still on RTTY or 11m...lol).  It dosnt take much power to effectively
operate PSK modes which is the glory of PSK.  (and here is the disconnect
with Tom) you rarely if ever need more that 10w (maybe 20w) to effectively
do PSK.  Remember, if you wanna run a full bucket on PSK, you should
consider going back to RTTY.

Ren!


On Mon, Sep 9, 2013 at 9:03 AM, Richard (KG3BOZ) <kg3boz at md.metrocast.net>wrote:

> I can attest to the usefulness of the psk meter.  I used one frequently
> when I was active on PSK.  It's well worth the money.
>
>
> 73 DE KG3BOZ
>
> -------- Original message --------
> From: "Clarke, Tom   AIR4.0P NATOPS" <frederic.clarke at navy.mil>
> Date: 09/09/2013  08:57  (GMT-05:00)
> To: Allen Landmann <alandmann at yahoo.com>
> Cc: smcara at mailman.qth.net
> Subject: Re: [SMCARA] PSK-31 Signal
>
> Hi Allen,
>
> Typically if you overdrive the audio into a SSB transmitter creating the
> PSK31 signal, you wind up with all those nasty sidebands. Adjusting the
> audio level into the transmitter so that there is no, or minimal, ALC
> indicating on the rig, will help keep it clean.  If you are really into
> PSK, there is a nifty little gizmo called PSK-Meter that will monitor your
> RF output and "ride herd" on the gain of the system via a signal sent to
> the sound card gain circuit. Also make sure you have the audio processing
> turned off. A mis-tuned linear amplifier (i.e., not running it "linear")
> will do this, but amps are not normally used on PSK, since 30-50 watts is
> all that is needed.
>
> Many hams subscribe to the "all knobs turned full right" theory of tuning
> up!  This also creates havoc on an SSB voice transmission.  We have all
> heard the "ESSB" boys and the guys with too much processing on the bands
> creating nasty sounding signals.  All those racks of audio processing
> equipment are fine if you are running a rock station, where distortion is
> considered an "enhancement", but not on the ham bands where intelligibility
> (note ,I didn't say intelligence!) is the goal!
>
> 73 Tom/W4OKW
>
> Tom Clarke
> Wyle, Inc  Aeronautics
> P3 Product Lead, PEO(A)
> USN/USMC National Airworthiness Office
> Naval Air Systems Command, AIR-4.0P
> (301) 995-3793/DSN 995-3793
> Fax: (301) 342-3776
> Cell (301) 904-2053
> frederic.clarke at navy.mil
>
> "A good Navy is not a provocation to war.
> It is the surest guaranty of peace."
> President Theodore Roosevelt
>
>
> -----Original Message-----
> From: smcara-bounces at mailman.qth.net [mailto:
> smcara-bounces at mailman.qth.net] On Behalf Of Allen Landmann
> Sent: Saturday, September 07, 2013 2:44 PM
> To: club
> Subject: [SMCARA] PSK-31 Signal
>
> I thought people might like to know what a bad signal looks like on the
> air. So here are a few pics of a guy in Ohio cluttering up the air waves at
> night on 40M, I was unable to reach him but another helpful ham was able to
> render assistance.
>  I'm curious what caused this, was it transmitter overload or a ground
> loop problem, the ham that helped him said that it could be the bands? It
> seems to me that no matter what the conditions are, a radio should not
> radiate harmonics by itself like that.
> The first screen shot is of a PSK-63 signal, the second is a PSK-31 both
> from the same guy. The red arrows show where the harmonics are. Any help in
> relation to why this would happen would be appreciated. Maybe we should
> have a test-your-radio-on-the-air night or activity and do our part to keep
> our bands free of bad signals.
>
> Allen,
> KB3WEY
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